Oriented perforating system

Description

BACKGROUND OF THE DISCLOSURE

Hydrocarbons, such as fossil fuels and natural gas, are extracted from underground wellbores extending deeply below the surface using complex machinery and explosive devices. Once the wellbore is established by placement of cases after drilling, a perforating gun assembly, or train or string of multiple perforating gun assemblies, is lowered into the wellbore and positioned adjacent one or more hydrocarbon reservoirs in underground formations. The perforating gun may have explosive charges which are ignited to create holes in the casing and to blast through the formation so that the hydrocarbons can flow through the casing. Once the perforating gun(s) is properly positioned, a surface signal actuates an ignition of a fuse, which in turn initiates a detonating cord, which detonates the shaped charges to penetrate/perforate the casing and thereby allow formation fluids to flow through the perforations thus formed and into a production string. The surface signal may travel from the surface along electrical wires that run from the surface to one or more initiators, such as ignitors or detonators positioned within the perforating gun assembly.

Assembly of a perforating gun requires assembly of multiple parts, which may include at least the following components: a housing or outer gun barrel within which is positioned an electrical wire for communicating from the surface to initiate ignition, of an initiator and/or a detonator, a detonating cord, one or more charges and, where necessary, one or more boosters. Assembly may include threaded insertion of one component into another by screwing or twisting the components into place, optionally by use of a tandem adapter. Since the electrical wire must extend through much of the perforating gun assembly, the wire may become easily twisted and crimped during assembly. In addition, when a wired detonator is used it must be manually connected to the electrical wire, which may lead to multiple problems. Due to the rotating assembly of parts, the wires can become torn, twisted and/or crimped/nicked, the wires may be inadvertently disconnected, or even mis-connected in error during assembly. This may lead to costly delays in extracting the hydrocarbons. Additionally, there is a significant safety risk associated with physically and manually wiring live explosives.

Accordingly, there may be a need for an initiator that would allow for reliable detonation of perforating guns without requiring physically and manually wiring live explosives.

Additionally, in certain applications, hydraulic fracturing may produce optimal results when perforations are oriented in the direction of maximum principle stress or the preferred fracture plane (PFP). Perforations oriented in the direction of the PFP create stable perforation tunnels and transverse fractures (perpendicular to the wellbore) that begin at the wellbore face and extend far into the formation. However, if fractures are not oriented in the direction of maximum stress, tortuous, non-transverse fractures may result, creating a complex near-wellbore flow path that can affect the connectivity of the fracture network, increase the chance of premature screen-out, and impede hydrocarbon flow. Accordingly, there may be a need for equipment that can allow for orientation verification of the perforating guns to ensure that perforations are formed in the preferred fracture plane. Similarly, there may be a need for perforating guns that can be efficiently connected together and the perforating direction individually oriented relative to other guns in a string.

BRIEF DESCRIPTION

In an aspect, the disclosure relates to an orientable perforating gun assembly, comprising a gun housing, a charge carrier, and an orientation alignment ring. The gun housing may have a first end and a second end opposite the first end, and an interior space between the first end and the second end. The charge carrier may be positioned in the gun housing interior space, in a fixed orientation relative to the gun housing, and the charge carrier may include a first end nearest to the gun housing first end, and a second end opposite the first end and nearest to the gun housing second end. The orientation alignment ring may be connected to the gun housing first end. The orientation alignment ring and the gun housing may be rotatable relative to each other when the orientation alignment ring is in an unfixed connection state, and an orientation of the gun housing may be fixed relative to the orientation alignment ring when the orientation alignment ring is in a fixed connection state.

In another aspect, the disclosure relates to an orientable perforating gun assembly, comprising a gun housing, a charge carrier, an initiator assembly, and an orientation alignment ring. The gun housing may include a first end and a second end opposite the first end, and an interior space between the first end and the second end. The charge carrier may be positioned in the gun housing interior space, in a fixed orientation relative to the gun housing, and the charge carrier may include a first end nearest to the gun housing first end, and a second end opposite the first end and nearest to the gun housing second end. The initiator assembly may be positioned within an initiator holder, in a fixed orientation relative to the charge carrier, at the charge carrier second end. The initiator assembly may include an orientation sensor, and the initiator holder and the initiator assembly may together be configured for the initiator assembly to initiate at least one of a detonating cord and a shaped charge within the gun housing interior space. The orientation alignment ring may be connected to the gun housing first end. The orientation alignment ring and the gun housing may be rotatable relative to each other when the orientation alignment ring is in an unfixed connection state, and an orientation of the gun housing may be fixed relative to the orientation alignment ring when the orientation alignment ring is in a fixed connection state.

In another aspect, the disclosure relates to a method for orienting an individual perforating gun assembly relative to other perforating gun assemblies in a string. The method may comprise providing the perforating gun assembly including a gun housing including a first end and a second end opposite the first end, and an interior space between the first end and the second end, a charge carrier positioned in the gun housing interior space, and retaining a shaped charge, in a fixed orientation relative to the gun housing, and an orientation alignment ring connected to the gun housing first end in an unfixed connection state. The method may further include rotating the gun housing to a desired orientation relative to the orientation alignment ring and fixing the orientation alignment ring to the gun housing first end by engaging a locking structure between the orientation alignment ring and the gun housing first end. The method may also include inserting an initiator assembly including an orientation sensor into an initiator holder on the charge carrier. In addition, the method may include connecting the perforating gun assembly to an adjacent, upstream perforating gun assembly, by connecting the gun housing second end to an orientation alignment ring of the adjacent, upstream perforating gun assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

A more particular description will be rendered by reference to exemplary embodiments that are illustrated in the accompanying figures. Understanding that these drawings depict exemplary embodiments and do not limit the scope of this disclosure, the exemplary embodiments will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

FIG. 1 is a cross section view of an initiator head according to an exemplary embodiment;

FIG. 2 is a perspective view of an initiator according to an exemplary embodiment;

FIG. 3 is a perspective view of an initiator according to an exemplary embodiment;

FIG. 4 is a partial, cross section view of an initiator according to an exemplary embodiment, showing a cutaway view of a head and a cross-section of an initiator shell;

FIG. 5 is a partial cross section view of an initiator according to an exemplary embodiment, showing a cutaway view of a head and a cross-section of an initiator shell;

FIG. 6 is a partial, cross section view of an initiator, illustrating contents of an initiator shell according to an exemplary embodiment;

FIG. 7 is a cross section view of an initiator according to an exemplary embodiment;

FIG. 8 is a perspective view of an initiator engaged with terminals according to an exemplary embodiment;

FIG. 9 is a bottom up view of an initiator engaged with terminals according to an exemplary embodiment;

FIG. 10 is a plan view of an initiator holder and terminals according to an exemplary embodiment;

FIG. 11 is a plan view of an initiator head and initiator holder according to an exemplary embodiment;

FIG. 12 is a plan view of an initiator holder and terminals according to an exemplary embodiment;

FIG. 13 is a plan view of an initiator head an initiator holder according to an exemplary embodiment;

FIG. 14 is a cutaway perspective view of an initiator head according to an exemplary embodiment;

FIG. 15 is a perspective view of a fuse connector assembly according to an exemplary embodiment;

FIG. 16 is a cutaway perspective view of an initiator head according to an exemplary embodiment;

FIG. 17 is a perspective view of a fuse connector assembly according to an exemplary embodiment;

FIG. 18 is a cutaway perspective view of an initiator head according to an exemplary embodiment;

FIG. 19 is a perspective view of a fuse connector assembly according to an exemplary embodiment;

FIG. 20 is a perspective view of a perforating gun assembly according to an exemplary embodiment;

FIG. 21 is a cross-sectional view of a perforating gun assembly according to an exemplary embodiment;

FIG. 22 is a cross-sectional view taken through a different depth of the perforating gun assembly of FIG. 21;

FIG. 23 is a cross-sectional view taken through a different depth of the perforating gun assembly of FIG. 21;

FIG. 24 is a cross-sectional view taken through a different depth of the perforating gun assembly of FIG. 21; and

FIG. 25 is a rear view of a perforating gun assembly according to an exemplary embodiment.

Various features, aspects, and advantages of the exemplary embodiments will become more apparent from the following detailed description, along with the accompanying drawings in which like numerals represent like components throughout the figures and detailed description. The various described features are not necessarily drawn to scale in the drawings but are drawn to emphasize specific features relevant to some embodiments.

The headings used herein are for organizational purposes only and are not meant to limit the scope of the disclosure or the claims. To facilitate understanding, reference numerals have been used, where possible, to designate like elements common to the figures.

DETAILED DESCRIPTION

Reference will now be made in detail to various embodiments. Each example is provided by way of explanation and is not meant as a limitation and does not constitute a definition of all possible embodiments.

FIGS. 1-7 show an exemplary embodiment of an initiator head 200. The initiator head may include a housing 201, a circuit board 210, a line-in terminal 212, a line-out terminal 214, a ground terminal 216, a stem 250, and a fuse 260.

As seen in FIG. 1, the housing 201 may extend in an axial direction 302 and may define an interior space 202. The housing 201 may be formed of an insulating material, and may be formed by molding, 3D-printing, additive manufacturing, subtractive manufacturing, or any other suitable method. For example, in an exemplary embodiment, the housing 201 may be formed of a non-conductive plastic material such as polyamide. The housing 201 may include a first housing piece 230 and a second housing piece 240 engaged together. Alternatively, the housing 201 may be an integral or monolithic piece molded or additively manufactured around the circuit board 210.

FIG. 1 further shows that an exemplary embodiment of the first housing piece 230 may include a first plate 232. A thickness direction of the first plate 232 may be substantially parallel to the axial direction 302. As further seen in FIGS. 1-2, an exemplary embodiment of the first plate 232 may be shaped as an annulus having a substantially circular periphery and a substantially circular through hole 236. The through hole 236 may be structured to expose the line-in terminal 212 to an exterior 204 of the housing 201. The first plate 232 may further include a sloped wall 220 sloping from the first plate in the axial direction 302 toward the circuit board 210. The sloped wall 220 may help to guide a contact pin to contact with the line-in terminal 212. The first housing piece 230 may further include a first outer peripheral wall 234 extending from the first plate 232 in the axial direction 302. FIG. 1 and FIG. 4 show an exemplary embodiment in which the first outer peripheral wall 234 extends from an outer periphery of the first plate 232.

FIG. 1 further shows that an exemplary embodiment of the second housing piece 240 may include a second plate 242. A thickness direction of the second plate 242 may be substantially parallel to the axial direction 302. As further seen in FIG. 3, an exemplary embodiment of the second plate 242 may be substantially circular in shape. The second plate 242 may further include through holes 246 structured to expose the line-out terminal 214 and the ground terminal 216 to an exterior 204 of the housing 201. The second housing piece 240 may further include a second outer peripheral wall 244 extending from the second plate 242 in the axial direction 302. FIG. 1 and FIG. 3 show an exemplary embodiment in which the second outer peripheral wall 244 extends from an outer periphery of the second plate 242.

As further seen in FIG. 1, the first outer peripheral wall 234 and the second outer peripheral wall 244 may overlap in the axial direction, such that the interior space 202 is formed between the first plate 232 and the second plate 242 in the axial direction. In other words, the interior space 202 may be bounded by the first housing piece 230 and the second housing piece 240. In an exemplary embodiment, a first housing piece radius of the first housing piece 230 may be smaller than a second housing piece radius of the second housing piece 240. Thus, the first housing piece 230 may be received within the second housing piece 240 with the first outer peripheral wall 234 being provided between the first plate 232 and the second plate 242 in the axial direction 302. Alternatively, the first housing piece radius may be larger than the second housing piece radius, and the second housing piece 240 may be received within the first housing piece 230, with the second peripheral wall 234 being provided between the first plate 232 and the second plate 242 in the axial direction 302.

The first housing piece 230 and the second housing piece 240 may be dimensioned such that the first housing piece 230 and the second housing piece 240 fit snugly together so as not to separate under normal operating conditions. Alternatively, the first housing piece 230 and the second housing piece 240 may be provided with a coupling mechanism such as hook or protrusion and a complementary recess, so that the first housing piece 230 and the second housing piece 240 may snap together. Alternatively, the first outer peripheral wall 234 and the second outer peripheral wall 244 may be complementarily threaded so that the first housing piece 230 and the second housing piece 240 may screw together. Alternatively, the first housing piece 230 and the second housing piece 240 may be bonded together with adhesive.

FIG. 1 further shows an exemplary embodiment of a circuit board 210. A thickness direction 211 of the circuit board 210 may be substantially parallel with the axial direction 302. As explained in further detail herein, orienting the thickness direction 211 substantially parallel with the axial direction 302 allows room for larger firing capacitors and/or surface mounted components 270 to be mounted on the circuit board 210.

In an exemplary embodiment, the line-in terminal 212, the line-out terminal 214, the ground terminal 216, and the fuse 260 may be in electrical communication with the circuit board 210. The line-in terminal 212 may be provided on a first side of the circuit board 210 in the axial direction, and thereby the line-in terminal 212 may be provided on a first side of the housing 201 in the axial direction (i.e., to the left in FIG. 1). The line-out terminal 214 and the ground terminal 216 may be provided on a second side of the circuit board 210 in the axial direction opposite to the first side (i.e., to the right in FIG. 1). The line-out terminal 214 may be configured to output a signal received by the line-in terminal 212, either directly or in response to processing by the circuit board 210, as described in detail herein, by being in electrical communication with either the line-in terminal 212 or the circuit board 210.

FIG. 3 shows an exemplary embodiment in which a plurality of line-out terminals 214 and a plurality of ground terminals 216 are provided. The plurality of line-out terminals 214 and the plurality of ground terminals 216 provide a layer of redundancy to help ensure sufficient connection of the initiator head 200 to external electrical components, as explained in detail herein. Each line-out terminal 214 of the plurality of line-out terminals 214 may be directly connected to each other within the housing 201 or on the circuit board 210. In other words, if one line-out terminal 214 is in electrical communication with the circuit board 210, then each line-out terminal 214 of the plurality of line-out terminals 214 may be in electrical communication with the circuit board 210. Similarly, if one line-out terminal 214 becomes in electrical communication with the line-in terminal 212, then each line-out terminal 214 of the plurality of line-out terminals may be in electrical communication with the line-in terminal 212. Similarly, if one ground terminal 216 is in electrical communication with the circuit board 210, then each ground terminal 216 of the plurality of ground terminals 216 may be in electrical communication with the circuit board 210.

As further seen in FIG. 1 and FIG. 7, the circuit board 210 may be a printed circuit board and/or may include one or more surface mounted components 270. The arrangement of the circuit board 210 and the shape of the initiator head 200 may provide sufficient space in the interior space 202 to accommodate a variety of surface mounted components 270. In an exemplary embodiment, the surface mounted component 270 of the circuit board 210 may be an integrated circuit (IC) with a dedicated function, a programmable IC, or a microprocessor IC. The circuit board 210 may be configured to activate the fuse 260 in response to a control signal received at the line-in terminal 212. For example, a user may send a firing signal via a firing panel. The firing signal may be received at the line-in terminal 212, and the circuit board 210, through ICs provided on the circuit board 210, may process the firing signal and activate the fuse 260. Additionally, the circuit board 210 may include a switch circuit configured to establish electrical communication between the line-out terminal 214 and the line-in terminal 212 in response to a predetermined switch signal. The line-out terminal 214 may be in electrical communication with subsequent initiator heads 200 provided downstream in a string of connected perforating guns, thereby allowing a user to send switch signals to toggle which initiator head is active to receive a firing command.

In an exemplary embodiment, one of the surface mounted components 270 may be one selected from a group consisting of a temperature sensor, an orientation sensor, a safety circuit, and a capacitor. Readings from one of these components may be used by a microprocessor on circuit board 210 to determine when it is appropriate to activate the fuse 260. The temperature sensor may be configured to measure temperature of the wellbore environment and provide a signal corresponding to the temperature to the circuit board 210. The orientation sensor may include, but is not limited to, an accelerometer, a gyroscope, and/or a magnetometer. The orientation sensor may be configured to determine an orientation of the initiator head 200 within the wellbore, which, if the orientation of the initiator head is fixed relative to a charge holder, can be used to determine an orientation of the charge(s) in the perforating gun. In an exemplary embodiment, the orientation sensor may determine an orientation of the initiator head 200 relative to gravity. Alternatively, the orientation sensor may determine an orientation of the initiator head relative an ambient magnetic field. The safety circuit may provide additional safety precautions to prevent unintentional activation of the initiator 100. The capacitor may be used to store a voltage to activate the fuse 260. The size of the interior space 202 may allow for a larger capacity capacitor to be used. This allows a larger discharge voltage for activating the fuse 260, which may help to ensure more reliable activation of the fuse 260.

FIG. 1 and FIGS. 4-7 further show an exemplary embodiment of the stem 250. The stem 250 may extend in the axial direction 302 from the housing 201. In an exemplary embodiment, the stem 250 may be formed of the same material as the second housing piece 240 and may be integrally and/or monolithically formed with the second plate 242. Alternatively, the stem may be formed as a separate piece and mechanically connected to the second housing piece via clips or mated structures such as protrusions and recesses, or adhesively connected using an adhesive.

As seen in FIG. 1, the stem 250 may include a stem outer peripheral wall 252. The stem outer peripheral wall 252 may define a stem cavity 254 provided radially inward from the stem outer peripheral wall 252. A first discharge channel 256 and a second discharge channel 258 may connect the stem cavity 254 and the interior space 202 of the housing 201. The first discharge channel 256 may accommodate therein a first discharge terminal 218 in electrical communication with the circuit board 210. In other words, the first discharge terminal 218 may extend from the circuit board 210 into the first discharge channel 256. Similarly, the second discharge channel 256 may accommodate therein a second discharge terminal 219 in electrical communication with the circuit board 210. In other words, the second discharge terminal 219 may extend from the circuit board 210 into the second discharge channel 258.

FIG. 1 further shows that, in an exemplary embodiment, the fuse 260 may be provided within the stem cavity 254. A first end of a first fuse terminal 262 may be in electrical communication with the first discharge terminal 218 within the first discharge channel 256, and a second end of the first fuse terminal may be proximate to the fuse 260. A first end of a second fuse terminal 264 may be in electrical communication with the second discharge terminal 219 within the second discharge channel 258, and a second end of the second fuse terminal 264 may be proximate to the fuse 260 and the second end of the first fuse terminal 262. The circuit board 210 may be configured to activate the fuse 260 in response to a control signal by discharging a stored voltage across the first fuse terminal 262 and the second fuse terminal 264. The store voltage may be stored in a capacitor in electrical communication with the circuit board 210. In an exemplary embodiment, the capacitor may be one of the surface mounted components 270 provided on the circuit board 210. The proximity of the second end of the first fuse terminal 262 and the second end of the second fuse terminal 264 may allow for the generation of a spark when the stored voltage is discharged, thereby activating the fuse 260. In an exemplary embodiment, activating the fuse 260 may include igniting or detonating the fuse 260.

As seen in FIG. 6, an exemplary embodiment of the stem 250 may include a window 253 cut through the stem outer peripheral wall 252. The window 253 may allow access for a user to connect the first discharge terminal 218 to the first fuse terminal 262 and the second discharge terminal 219 to the second fuse terminal 264, such as by soldering, during assembly of the initiator head 200.

FIGS. 14-19 show exemplary embodiments in which the circuit board 210 is in electrical communication with the fuse 260 via direct physical contact, so as to streamline the manufacturing process by eliminating soldering between the circuit board 210 and the fuse 260. For example, FIG. 14 shows an exemplary embodiment in which the circuit board 210 is in electrical communication with the fuse 260 via a fuse connector assembly 600. The fuse connector assembly 600 may include a first discharge connector 602 configured to receive and make direct electrical contact with the first fuse terminal 262 and a second discharge connector 604 configured to receive and make direct electrical contact with the second fuse terminal 264 (not shown in FIG. 14).

The fuse connector assembly 600 may include a mounting block 606, the first discharge connector 602 extending through the mounting block 606, and the second discharge connector 604 extending through the mounting block 606. The mounting block 606 may be formed of an insulating material and may facilitate connection and/or fastening of the fuse connector assembly 600 to the circuit board 210. Further, the mounting block 606 may provide mechanical strength and support for the fuse connector assembly 600. When the fuse connector assembly 600 is connected to the circuit board 210, the first discharge connector 602 and the second discharge connector 604 may extend from the circuit board 210 into the stem 250.

FIG. 15 further shows an exemplary embodiment of the first discharge connector 602. For simplicity, only the first discharge connector 602 is described in detail herein; it will be understood from FIG. 15 that the second discharge connector 604 may be substantially similar to the first discharge connector 602 in terms of structure. The first discharge connector 602 may be formed of an electrically conductive material. The first discharge connector 602 may include a first body portion 610, and a first board connector terminal 612 may be provided at a first end of the first body portion 610. The first board connector terminal 612 may connect to the circuit board 210.

The first discharge connector 602 may further include a first base portion 620 and a second base portion 630 extending from the first body portion 610 at a second end of the first body portion 610. The first discharge connector 602 may further include a first arm portion 622 extending from the first base portion 620 and a second arm portion 632 extending from the second base portion 630. The first arm portion 622 may be bent or inclined in a direction toward the second arm portion 632. Similarly, the second arm portion 632 may be bent or inclined in a direction toward the first arm portion 622. The first discharge connector 602 may further include a first tip portion 624 at an end of the first arm portion 622 and a second tip portion 634 at an end of the second arm portion 632. The first tip portion 624 may be bent or inclined in a direction away from the second tip portion 634. Similarly, the second tip portion 634 may be bent or inclined in a direction away from the first tip portion 624.

A first contact portion 626 may be formed between the first arm portion 622 and the first tip portion 624, and a second contact portion 636 may be formed between the second arm portion 632 and the second tip portion 634. The first contact portion 626 may be resiliently biased toward the second contact portion 636 based on the connection between the first base portion 620 and the first arm portion 622. Similarly, the second contact portion 636 may be resiliently biased toward the first contact portion 626 based on the connection between the second base portion 630 and the second arm portion 632. The first contact portion 626 may be in contact with the second contact portion 636. Alternatively, there may be a gap between the first contact portion 626 and the second contact portion 636. In an exemplary embodiment, a size of the gap may be less than a thickness of the first fuse terminal 262.

The first discharge connector 602 may be configured to receive, and make electrical contact with, the first fuse terminal 262. Similarly, the second discharge connector 604 may be configured to receive, and make electrical contact with, the second fuse terminal 264. For example, during assembly of the initiator head 200, the circuit board 210 and the fuse 260 may be pushed together in the axial direction 302, thereby bringing the first fuse terminal 262 into contact with the first tip portion 624 and the second tip portion 634. Further relative motion between the fuse 260 and the circuit board 210 may cause the first fuse terminal 262 to deflect the first tip portion 624 and the second tip portion 634 away from each other. The first fuse terminal 262 may then be in contact with the first contact portion 626 and the second contact portion 636, i.e., sandwiched between the first contact portion 626 and the second contact portion 636. The resilient bias of the first contact portion 626 and the second contact portion 636 may help to maintain contact, and thus electrical communication, between the first contact portion 626, the second contact portion 636, and the first fuse terminal 262. It will be understood that contact between the second discharge connector 604 and the second fuse terminal 264 may be achieved in a similar way. The window 253 may allow for visual confirmation of the connection between the first discharge connector 602 and the first fuse terminal 262 and between the second discharge connector 604 and the second fuse terminal 264.

FIG. 16 shows an exemplary embodiment in which the circuit board 210 is in electrical communication with the fuse 260 via a fuse connector assembly 700. The fuse connector assembly 700 may include a first discharge connector 702 configured to receive and make direct electrical contact with the first fuse terminal 262 and a second discharge connector 704 configured to receive and make direct electrical contact with the second fuse terminal 264 (not shown in FIG. 16).

The fuse connector assembly 700 may include a mounting block 706, the first discharge connector 702 extending through the mounting block 706, and the second discharge connector 704 extending through the mounting block 706. The mounting block 706 may be formed of an insulating material and may facilitate connection and/or fastening of the fuse connector assembly 700 to the circuit board 210. Further, the mounting block 706 may provide mechanical strength and support for the fuse connector assembly 700. When the fuse connector assembly 700 is connected to the circuit board 210, the first discharge connector 702 and the second discharge connector 704 may extend from the circuit board 210 into the stem 250.

FIG. 17 further shows an exemplary embodiment of the first discharge connector 702. For simplicity, only the first discharge connector 702 is described in detail herein; it will be understood from FIG. 17 that the second discharge connector 704 may be substantially similar to the first discharge connector 702 in terms of structure. The first discharge connector 702 may be formed of an electrically conductive material. The first discharge connector 702 may include a first body portion 710, and a first board connector terminal 712 may be provided at a first end of the first body portion 710. The first board connector terminal 712 may connect to the circuit board 210.

The first discharge connector 702 may further include a first base portion 720 and a second base portion 730 extending from the first body portion 710 at a second end of the first body portion 710. The first discharge connector 702 may further include a first arm portion 722 extending from the first base portion 720 and a second arm portion 732 extending from the second base portion 730. The first arm portion 722 may be bent or inclined in a direction away from the second arm portion 732. Similarly, the second arm portion 732 may be bent or inclined in a direction away from the first arm portion 722. The first discharge connector 702 may further include a first tip portion 724 at an end of the first arm portion 722 and a second tip portion 734 at an end of the second arm portion 732. The first tip portion 724 may be bent or inclined in a direction toward the second tip portion 734 and back toward the first body portion 710. Similarly, the second tip portion 734 may be bent or inclined in a direction toward the first tip portion 724 and back toward the first body portion 710.

A first contact portion 726 may be formed at an end of the first tip portion 724, and a second contact portion 736 may be formed at an end of the second tip portion 734. The first contact portion 726 may be resiliently biased toward the second contact portion 736 based on the connection between the first base portion 720 and the first arm portion 722. Similarly, the second contact portion 736 may be resiliently biased toward the first contact portion 726 based on the connection between the second base portion 730 and the second arm portion 732. The first contact portion 726 may be in contact with the second contact portion 736. Alternatively, there may be a gap between the first contact portion 726 and the second contact portion 736. In an exemplary embodiment, a size of the gap may be less than a thickness of the first fuse terminal 262.

The first discharge connector 702 may be configured to receive, and make electrical contact with, the first fuse terminal 262. Similarly, the second discharge connector 704 may be configured to receive, and make electrical contact with, the second fuse terminal 264. For example, during assembly of the initiator head 200, the circuit board 210 and the fuse 260 may be pushed together in the axial direction 302, thereby bringing the first fuse terminal 262 into contact with the first tip portion 724 and the second tip portion 734. Further relative motion between the fuse 260 and the circuit board 210 may cause the first fuse terminal 262 to deflect the first tip portion 724 and the second tip portion 734 away from each other. The first fuse terminal 262 may then be in contact with the first contact portion 726 and the second contact portion 736, i.e., sandwiched between the first contact portion 726 and the second contact portion 736. The resilient bias of the first contact portion 726 and the second contact portion 736 may help to maintain contact, and thus electrical communication, between the first contact portion 726, the second contact portion 736, and the first fuse terminal 262. It will be understood that contact between the second discharge connector 704 and the second fuse terminal 264 may be achieved in a similar way. The window 253 may allow for visual confirmation of the connection between the first discharge connector 702 and the first fuse terminal 262 and between the second discharge connector 704 and the second fuse terminal 264.

FIGS. 18-19 show an exemplary embodiment in which the circuit board 210 is in electrical communication with the fuse 260 via a fuse connector assembly 800. The fuse connector assembly 800 is similar in many aspects to the fuse connector assembly 700; similar structures will be indicated with the same reference numerals, and detailed descriptions of these similar structures will be omitted. In the fuse connector assembly 800, the first arm portion 822 may include a first arm part 822a extending from the first base portion 720 and a second arm part 822b extending from the first arm part 822a. The second arm portion 832 may include a third arm part 832a extending from the first base portion 730 and a fourth arm part 832b extending from the first arm part 832a. Each of the first art part 822a and the third arm part 832a may be bent or inclined in a direction away from each other. Each of the second arm part 822b and the fourth arm part 832b may be bent or inclined in a direction toward each other.

FIGS. 2-7 shows an exemplary embodiment of an initiator 100. The initiator 100 may include an initiator head 200 and an initiator shell 300. The initiator head 200 may be similar in structure and function as described in detail above. The initiator shell 300 may be coaxial with the initiator head 200. In an exemplary embodiment, a head dimension X1 of the head 200 in a first direction perpendicular to the axial direction 302 may be larger than a shell dimension X2 in the first direction. According to an aspect, the initiator may be configured as an ignitor or a detonator, depending on the needs of the application.

In an exemplary embodiment, the initiator shell 300 may include a shell wall 310 and a shell crimp 312 crimped around the stem 250. The shell wall 310 may extend in the axial direction 302 and may be formed of a deep-drawn metal. Non-limiting examples of the metal used for the shell wall 310 may include aluminum, copper, steel, tin, or brass. Plastics may also be used a material for the shell wall 310. The shell wall 310 may define a shell interior 320. A primary explosive 322 may be provided within the shell interior 320. In an exemplary embodiment, the circuit board 210 may be configured to activate the primary explosive 322, and in some embodiments the primary explosive 322 and the secondary explosive 324, in response to a control signal received at the line-in terminal 212. For example, the primary explosive 322 may be arranged such that the fuse 260 is within an operable distance of the primary explosive 322. Being within an operable distance means that the fuse 260 is provided close enough to the primary explosive 322 that the primary explosive 322 is ignited and/or detonated when the fuse 260 is activated. In other words, by activating the fuse 260 in response to a control signal, the circuit board 210 may activate the primary explosive 322.

The secondary explosive 324 may abut the primary explosive 322 and seal the primary explosive 322 within a non-mass explosive (NME) body 330. The primary explosive 322 and the secondary explosive 324 may have a total thickness of about 3 mm to about 30 mm in an exemplary embodiment. Alternatively, the total thickness may be about 3 mm to about 10 mm. The secondary explosive 324 may be configured as a layer of an explosive material. According to an exemplary embodiment, the primary explosive 322 may include at least one of lead azide, silver azide, lead styphnate, tetracene, nitrocellulose, BAX, and a lead azide free primary explosive as described in USPGP 2019/0256438, herein incorporated by reference.

Each of the primary explosive 322 and the secondary explosive 324 may have a safe temperature rating of above 150° C. (with the exception of PETN, which has a rating of approximately 120° C.). The secondary explosive 324 may include a material that is less sensitive to initiation, as compared to the primary explosive 322. The secondary explosive 324 may include at least one of PETN, RDX, HMX, HNS and PYX. In an embodiment, the secondary explosive 324 may be less sensitive to initiation than PETN.

The primary explosive 322 and the secondary explosive 324 may be provided within the NME body 330. The NME body 330 may help to avoid an unintentional initiation of the primary explosive 322 or the main load explosive 332 by an external mechanical force. The NME body 330 may be composed of an electrically conductive, electrically dissipative or electrostatic discharge (ESD) safe synthetic material. According to an exemplary embodiment, the non-mass-explosive body 330 may be formed of a metal, such as cast-iron, zinc, machinable steel or aluminum. Alternatively, the NME body 330 may be formed from a plastic material. While the NME body 330 may be made using various processes, the selected process utilized for making the NME body 330 is based, at least in part, by the type of material from which it is made. For instance, when the NME body 330 is made from a plastic material, the selected process may include an injection molding process. When the NME body 330 is made from a metallic material, the NME body 330 may be formed using any conventional CNC machining or metal casting processes.

The initiator shell 300 may further include a main load explosive 332 provided adjacent the primary explosive 322, and in embodiment including a secondary explosive 324, adjacent the secondary explosive 324. The main load explosive 332 includes compressed secondary explosive materials. According to an aspect, the main load explosive 332 may include one or more of cyclotrimethylenetrinitramine (RDX), octogen/cyclotetramethylenetetranitramine (HMX), hexanitrostilbene (HNS), pentaerythritol tetranitrate (PETN), 2,6-Bis(picrylamino)-3,5-dinitropyridine (PYX), and 1,3,5-triaminio-2,4,6-trinitobenzene (TATB). The type of explosive material used may be based at least in part on the operational conditions in the wellbore and the temperature downhole to which the explosive may be exposed.

In an exemplary embodiment shown in FIGS. 11-13, an exterior shape of the housing 201 may be rotationally asymmetric with respect to the axial direction 302. In other words, when looking along the axial direction 302, a periphery of the housing 201 may be shaped such that an orientation of the housing 201 is unique for each angle around the axial direction. For example, FIG. 11 shows that a key protrusion 290 or a key protrusion 292 may be formed on a periphery of the housing 201, and FIG. 13 shows that a key recess 294 may be formed on a periphery of the housing 201. As is clear from FIG. 11 and FIG. 13, there are no possible rotations of the housing 201 where the housing 201 has a matching profile. In other words, an exterior profile of housing 201 is unique for each possible rotation angle. It will be understood that the size, shape, and/or number of key protrusions and/or key recesses is not limited to what is shown in FIG. 11 and FIG. 13, as long as they create a rotational asymmetry in the shape of housing 201. Additionally, key protrusions and key recesses may be combined together on a single housing 201.

FIGS. 8-13 illustrate an exemplary embodiments of an initiator system 500. The initiator system 500 may include an initiator holder 400 (see FIGS. 10-13) and an initiator 100 received within the initiator holder 400.

As seen in FIGS. 8-10, an exemplary embodiment of the initiator holder 400 may include a holder ground terminal 410. The holder ground terminal 410 may include a holder ground contact 412. In an exemplary embodiment shown in FIGS. 8-9, the holder ground contact 412 may be punched from the material of the holder ground terminal 410 and then bent to a side of the holder ground terminal 410. This may help to impart a spring-loaded action to the holder ground contact 412 and bias the holder ground contact 412 in a direction toward the initiator head 200, thereby helping to ensure a more secure electrical contact between the ground terminal 216 and the holder ground contact 412. In other words, when the initiator 100 is positioned within the initiator holder 400, the holder ground contact 412 may be in electrical communication with the ground terminal 216 (see FIG. 9) via contact.

FIGS. 8-10, and FIG. 12 show that, in an exemplary embodiment of the holder ground terminal 410, the holder ground contact 412 may be one of a plurality of holder ground contacts 412. As seen in FIG. 9, if the initiator head 200 includes a plurality of ground terminals 216, then the plurality of holder ground contacts 412 provided a layer of redundancy for establishing a connection to ground. For example, even of one pair the ground terminals 216 and the holder ground contacts 412 fails to establish a secure electrical connection, a second pair of the ground terminals 216 and the holder ground contacts 412 may form a secure electrical connection.

As further seen in FIGS. 10-13, the initiator holder 400 may further include a holder ground bar 414 extending from the holder ground terminal 410. The holder ground bar 414 may contact a ground when the initiator holder 400 is received within a perforating gun. In other words, the holder ground terminal 410 may be in electrical communication with ground, for example through the holder ground bar 414.

As further seen in the exemplary embodiment of FIG. 10, the initiator holder 400 may include a through-wire terminal 420. The through-wire terminal 420 may include a through-wire contact 422. In an exemplary embodiment shown in FIGS. 8-9, the through wire contact 422 may be punched from the material of the through-wire terminal 420 and then bent to a side of the through-wire terminal 420. This may help to impart a spring-loaded action to the through-wire contact 422 and bias the through-wire contact 422 in a direction toward the initiator head 200, thereby helping to ensure a more secure electrical contact between the through-wire terminal 214 and the through-wire contact 414. In other words, when the initiator 100 is positioned within the initiator holder 400, the through-wire contact 422 may be in electrical communication with the through-wire terminal 214 via contact.

FIGS. 8-9, FIG. 10, and FIG. 12 show that, in an exemplary embodiment of the through-wire terminal 420, the through-wire contact 422 may be one of a plurality of through-wire contacts 422. As seen in FIG. 9, if the initiator head 200 includes a plurality of through-wire terminals 214, then the plurality of through-wire contacts 422 provided a layer of redundancy for establishing an electrical connection. For example, even of one pair the through-wire terminals 214 and the through-wire contacts 422 fails to establish a secure electrical connection, a second pair of the through-wire terminals 214 and the through-wire contacts 412 may form a secure electrical connection.

FIGS. 10-13 show exemplary embodiments of an initiator system 500 comprising a key system configured to ensure a correct alignment between the initiator 100 and the initiator holder 400. For example, when an initiator 100 is received into holder hole 402, the initiator 100 may rotate around the axial direction 302. This could create a misalignment between the through-line terminal(s) 214 and the ground terminal(s) 216 of the initiator head 200 and the through-line contact(s) 422 and holder ground contact(s) 412 of the holder 400. Accordingly, a key system may be configured to rotationally fix the initiator head 200 relative to the holder 400, thereby helping to ensure a correct alignment between the initiator 100 and the initiator 400. In this context, a correct alignment may be an alignment in which the through-line terminal(s) 214 and the ground terminal(s) 216 of the initiator head 200 are correspondingly aligned with the through-line contact(s) 422 and holder ground contact(s) 412 of the holder 400.

FIGS. 10-11 show an exemplary embodiment in which recesses 440, 442 may be formed in an outer peripheral wall 430 of the holder 400. For example, a first holder recess 440 may be formed partially through the outer peripheral wall 430. Alternatively or additionally, a second holder recess 442 may be formed through the entire thickness of the outer peripheral wall 430. As seen in FIG. 11, an exemplary embodiment of the housing 201 of the initiator head 200 may include a first key protrusion 290 formed on an outer periphery of housing 201. The first key protrusion 290 may be shaped and sized to fit within the first holder recess 440. Alternatively or additionally, a second key protrusion 292 may be formed on an outer periphery of the housing 201. The second key protrusion 292 may be shaped and sized to fit within the second holder recess 442.

FIGS. 12-13 show an exemplary embodiment in which protrusions may be formed in the outer peripheral wall 430 of the holder 400. For example, a holder protrusion 444 may extend radially inwardly from the outer peripheral wall 430. As seen in FIG. 13, an exemplary embodiment of the housing 201 of the initiator head 200 may include a housing recess 294 corresponding to the holder protrusion 444.

It will be understood from the exemplary embodiments shown in FIGS. 10-13 that the number, size, and shape of recesses and protrusions may be varied to achieve the same effect, as long as the recesses and their corresponding protrusions are rotationally asymmetric around the longitudinal axis. For example, a single recess and a single protrusion may be sufficient to achieve rotational asymmetry. Alternatively, a plurality of recesses of corresponding protrusions may be used. Further, it will be understood that recesses and protrusions may be mixed on a single piece. For example, an exemplary embodiment of the housing 201 may include both a protrusion and a recess, corresponding to a complementary recess and protrusion on the initiator holder 400.

With reference now to FIGS. 20-25, an exemplary embodiment of an orientable perforating gun assembly 900 incorporating an initiator assembly 950 according to the disclosure is shown. The initiator assembly 950 shown and described with respect to FIGS. 20-25 refers collectively to initiator components including, for example, the initiator head 200, the stem 250, and the shell 300, and associated components including the circuit board 210, the line-in terminal 212, the line-out terminal 214, and the ground terminal 216, according to the exemplary embodiments of an initiator described above and throughout the disclosure.

The orientable perforating gun assembly 900 shown and described with respect to FIGS. 20-25 includes, in part and without limitation, a perforating gun assembly as shown and described in U.S. Publication No. 2020/0024935 published Jan. 23, 2020, which is commonly owned by DynaEnergetics Europe GmbH and incorporated by reference herein in its entirety. The features, configurations, and aspects of the orientable perforating gun assembly 900 shown and described with respect to FIGS. 20-25 may be similarly incorporated in any perforating gun assembly consistent with the disclosure.

As shown in FIG. 20, the exemplary orientable perforating gun assembly 900 includes, among other things, a gun housing 910 having a first end 912 connected to an orientation alignment ring 930, and a second end 914 opposite the first end. A locking ring 940 is positioned within a bore 932 of the orientation alignment ring 930, as discussed further below. The locking ring 940 includes tool connectors 942 for connecting to a tool (e.g., purpose-made pliers, not shown) that is used to lock the locking ring 940 within the orientation alignment ring bore 932. Locking structure holes 934 on the orientation alignment ring 930 receive locking structures, such as set screws or pins 936 (or the like), for locking the orientation alignment ring 930 to the gun housing first end 912, in a fixed position, as discussed further below. A second pin connector end 968 of an electrical transfer assembly 964, discussed further below, protrudes through an aperture 944 of the locking ring 940.

With reference now to FIGS. 21-24, various cross-sections taken at different depths through the exemplary perforating gun assembly 900 are shown, to more clearly illustrate the various components. For reference, like numerals refer to like components, even where a component may be shown only in part in a particular cross-section, due to the depth of the cross-section.

As shown in the exemplary embodiment(s), the gun housing 910 includes an interior space 916 between the first end 912 and the second end 914, and a charge carrier 920 including a shaped charge 927 is positioned in the gun housing interior space 916. The charge carrier 920 retains the shaped charge 927 in a shaped charge receptacle 980. The charge carrier 920 and the shaped charge 927 are positioned in a fixed orientation relative to the gun housing 910 and, in the exemplary embodiment, aligned with a scallop 915, i.e., an area of reduced thickness of the gun housing 910 through which the shaped charge 927 fires, for reducing damaging burrs as a result of the explosive penetration. The charge carrier 920 includes a first end 921 nearest to the gun housing first end 912, and a second end 922 opposite the first end 921 and nearest to the gun housing second end 914.

The orientation alignment ring 930 is connected to the gun housing first end 912 and surrounds both the gun housing first end 912 and the locking ring 940 which is connected to the gun housing first end 912, within the bore 932 of the orientation alignment ring 930. The locking ring 940 is connected to the gun housing first end 912 via a threaded connection between an external threaded portion 913 of the gun housing first end 912 and a threaded portion 945 of the locking ring 940. Alternatively, the locking ring 940 may be integrally and/or monolithically formed as a unitary structure with the gun housing first end 912. Accordingly, at least a portion of each of the locking ring 940 and the gun housing first end 912 is positioned within the bore 932 of the orientation alignment ring 930.

Before the set screws 936 are inserted through the locking structure holes 934 to secure the orientation alignment ring 930 to the gun housing first end 912, the orientation alignment ring 930 is in an unfixed connection state such that the orientation alignment ring 930 can be rotated an unlimited number of times about a longitudinal axis 911, and thereby the gun housing 910, of the perforating gun assembly 900. In other words, the orientation alignment ring 930 and the gun housing 910 are rotatable relative to each other when the orientation alignment ring 930 is in the unfixed connection state. Thus, the gun housing 910, the charge carrier 920 and the shaped charge 927 are rotatable to a desired orientation relative to the orientation alignment ring 930 and other perforating gun assemblies in a string of perforating gun assemblies. The orientation of the gun housing 910, and thereby the charge carrier 920 and the shaped charge 927, is fixed when, e.g., the set screws 936 are inserted into the locking structure holes 934 and lock the orientation alignment ring 930 to the gun housing first end 912, in a fixed connection state. In the fixed connection state, the orientation alignment ring 930 and the gun housing 910 are not rotatable relative to each other. The orientation alignment ring 930 is in a sealing contact with the gun housing first end 912 via, e.g., o-rings 969 on an outside of the gun housing first end 912, in sealing contact with, and between, the gun housing first end 912 and the orientation alignment ring 930 within the orientation alignment ring bore 932.

The charge carrier 920 includes an initiator holder 400, as discussed above and throughout the disclosure, positioned at the charge carrier second end 922 and dimensioned for receiving an initiator assembly 950 in a fixed orientation relative to the charge carrier 920. With respect to the charge carrier 920 in the exemplary embodiment(s) of a perforating gun assembly shown in FIGS. 21-25, the initiator holder 400 may include, e.g., an outer peripheral wall 430 according to the exemplary embodiments described above, along with a passage 929 within at least a portion of a body 925 of the charge carrier 920. The charge carrier passage 929 is aligned with and open to a holder hole 402 of the initiator holder 400, according to the exemplary embodiments, along the longitudinal axis 911 of the perforating gun assembly 900. Accordingly, the charge carrier passage 929 may receive, e.g., the stem 250 and the shell 300 of the initiator assembly 950, and the initiator holder outer peripheral wall 430 may receive the initiator head 200. In addition, the charge carrier body 925 may include a detonating cord passage 971 for receiving a detonating cord 970 in a ballistic coupling proximity to the initiator shell 300, such that initiation of the explosive components of the initiator will initiate the detonating cord 970 for then initiating the shaped charge 927. In other embodiments, the charge carrier body 925, including the charge carrier passage 929 and shaped charge receptacle 980 may be configured such that the initiator assembly 950 directly initiates the shaped charge 927.

The initiator head 200, as previously discussed, includes a line-in terminal 212, a line-out terminal 214 and a ground terminal 216 (not shown in FIGS. 21-25) according to the exemplary embodiments. With reference specifically to FIG. 24, the exemplary perforating gun assembly includes a through-wire terminal 420 (according to the exemplary embodiments described above, throughout the disclosure) extending from a position within the initiator holder 400 to an outside of the initiator holder 400. The through-wire terminal 420, as previously discussed, is positioned on or within the initiator holder 400 to make contact with the line-out terminal 214 of the initiator head 200. A through-wire 962 of the perforating gun assembly is in electrical communication with the through-wire terminal 420, and thereby the line-out terminal 214 of the initiator head 200.

The exemplary perforating gun assembly 900 further includes a pressure bulkhead 960 including an electrical transfer assembly 964, and the electrical transfer assembly 964 is in electrical communication with the through-wire 962 which, in the exemplary embodiments, extends from the through-wire terminal 420 to the electrical transfer assembly 964. The pressure bulkhead 960 is positioned within and seals a bulkhead channel 966 that extends through the gun housing first end 912, from the gun housing interior space 916 to an outside of the gun housing 910, and is open to each of the gun housing interior space 916 and the outside of the gun housing 910. The bulkhead 960 may seal the bulkhead channel 966 via, e.g., o-rings 969 on an outside of the bulkhead 960, that seal against the bulkhead channel 966.

The electrical transfer assembly 964, in the exemplary embodiments, includes a first pin connector end 967 and a second pin connector end 968 opposite the first pin connector end, wherein the first pin connector end 967 and the second pin connector end 968 are in electrical communication via conductive components that may include, e.g., conductive inserts 963 and conductive spring contacts 965 within the bulkhead 960. Conductive components may be sealed within the bulkhead 960 via, e.g., o-rings 969. The conductive spring contacts 965 may provide a bias to enhance electrical contact made by the first pin connector end 967 and the second pin connector end 968, as discussed herein. The bulkhead 960 and electrical transfer assembly 964 may further be according to, without limitation, a bulkhead and electrical transfer assembly as shown and described in U.S. Pat. No. 10,844,697 issued Nov. 24, 2020, or U.S. Publication No. 2020/0217635 published Jul. 9, 2020, which are each commonly owned by DynaEnergetics Europe GmbH and incorporated herein by reference in their entirety.

With continuing reference to FIGS. 21-24, the first pin connector end 967 is in electrical contact with the through-wire 962 or an electrical feedthrough contact 924 in electrical communication with the through-wire 962, within a feedthrough connection portion 923 of the charge carrier first end 921, and the second pin connector end 968 extends to the outside of the gun housing 910.

In the exemplary embodiment(s), the gun housing first end 912 is a male end and the gun housing second end 914 is a female end. The orientation alignment ring 930 further includes an external threaded portion 933 and the external threaded portion 933 of the orientation alignment ring 930 is configured for connecting to a complementary internal threaded portion, i.e., internal threaded portion 919 of the gun housing second (female) end 914, of a second (female) end of an adjacent, downstream perforating gun assembly in a perforating gun string. For purposes of this disclosure, “downstream” means further down into the wellbore while “upstream” means further towards the wellbore surface. However, depending on the direction in which a firing signal may be relayed through the perforating gun assemblies in the perforating gun assembly string, a relative direction, i.e., upstream or downstream, of the perforating gun assemblies and connections may be reversed without departing from the spirit and scope of the disclosure. The gun housing second (female) end 914 is similarly configured for connecting to an adjacent, upstream orientation alignment ring connected to a male end of an adjacent, upstream perforating gun assembly in the perforating gun string.

As previously discussed, the initiator assembly 950 includes, at the initiator head 200, a line-in portion 212. The gun housing first (male) end 912 and the electrical transfer assembly 964, including, e.g., the second pin connector end 968, are collectively dimensioned for the second pin connector end 968 to electrically contact a downstream line-in portion of the adjacent, downstream perforating gun assembly, when the orientation alignment ring 930 is connected to the female end of the downstream perforating gun assembly.

With continuing reference to FIGS. 21-25, the charge carrier 920 in the exemplary perforating gun assembly 900 includes an orienting structure 926 extending away from the body 925 of the charge carrier 920, in a direction towards an internal surface 918 of the gun housing. An engagement portion 928 of the orienting structure 926 is in contact with the gun housing internal surface 918 and fixes an orientation of the charge carrier 920 (and, thereby, the shaped charge 927) relative to the gun housing 910 by, for example and without limitation, friction, contact force, and the like. The charge carrier 920 including the charge carrier body 925, shaped charge receptacle 980, initiator holder 400, and orienting structure 926, in the exemplary embodiment(s), may be integrally formed by, e.g., injection molding. However, any connections, configurations, and assembly of such components, consistent with this disclosure, may similarly be used. Further, relative designations of component “ends” or components or portions such as the initiator holder 400, charge carrier body 925, and the like, are for ease in describing the components and configurations and are not limited to any particular boundaries or delineations between components.

In an exemplary embodiment, the orienting structure 926 may divide the interior space 916 into a first interior space 916a to a first side of the orienting structure 926 and a second interior space 916b to a second side of the orienting structure 926. The orienting structure 926 may include spaces 931 such that the first interior space 916a is in pressure communication with the second interior space 916b. This may significantly increase the free gun volume within the gun housing 910, thereby allowing for a shorter overall gun housing 910 and/or a larger amount of explosives to be used within the shaped charge 927 while reducing the likelihood that the gun housing 910 ruptures or splits.

In an aspect, at least a portion of the charge carrier body 925 is aligned with the longitudinal axis 911. Further to such aspect, the electrical transfer assembly 964 including the second pin connector end 968, and the line-in terminal 212 of the initiator assembly 950, are similarly aligned along the longitudinal axis 911 such that when adjacent perforating gun assemblies 900 are connected together, the electrical contact between, e.g., the second pin connector end 968 of the perforating gun assembly 900 and a line-in terminal of an initiator assembly in the adjacent, downstream perforating gun assembly will automatically make electrical contact when the perforating gun assembly 900 is connected to the adjacent, downstream perforating gun assembly.

With reference in particular now to FIG. 25, the initiator assembly 950 is positioned within the initiator holder 400 in a fixed orientation relative to the charge carrier 920. The initiator assembly 950 includes, among other things, an orientation sensor, e.g., mounted on the circuit board 210 inside the initiator head 200 as previously discussed. In the exemplary embodiment(s) shown in FIG. 25, the initiator assembly includes a key protrusion 290 on a periphery of a housing 201 of the initiator assembly 950 (i.e., the initiator head 200 as previously discussed), for orienting the initiator assembly 950 within the initiator holder 400 and thereby the charge carrier 920 and the gun housing 910. The initiator holder 400 includes a recess 440 on an outer peripheral wall 430 of the initiator holder 400, and the key protrusion 290 is received within the recess 440, to orient the initiator assembly 950. Other configurations of key protrusions, as discussed above throughout this disclosure, and techniques for orienting the initiator assembly 950 with respect to the initiator holder 400 consistent with this disclosure, may similarly be used.

As previously discussed, the orientation sensor may include one of an accelerometer, in inclinometer, a gyroscope, and a magnetometer. The orientation sensor may be configured to determine an orientation of the initiator assembly 950 within the wellbore and thereby an orientation of the perforating gun assembly 900, including the gun housing 910, the charge carrier 920, and the shaped charge 927, which are in a known, fixed orientation relative to each other, according to the set orientation of the gun housing 910 as discussed with respect to the orientation of the gun housing 910 and the orientation alignment ring 930 in the fixed connection state. The initiator assembly line-in terminal 212, as previously discussed, may be in electrical communication with a firing controller on a surface of the wellbore, and the orientation sensor may be configured for sending real-time orientation information to the firing controller, via the line-in terminal 212. As such, each individual perforating gun assembly in a string of perforating gun assemblies may be selectively fired at the desired perforating location and orientation within the wellbore. The electrical communication between the line-out terminal 214 and the electrical transfer assembly 964 in each perforating gun assembly 900, and the electrical communication between the electrical transfer assembly of each perforating gun and the line-in terminal of a corresponding adjacent, downstream perforating gun, allows each individual gun to communicate its real-time orientation information to the firing controller at the surface of the wellbore, and receive its unique firing signal from the controller. Accordingly, an operator may orient each individual perforating gun assembly in a preferred direction as required to perforate a PFP in a well completion design. The orientation, i.e., perforating direction, of each individual perforating gun assembly, may then be confirmed in a real-time (i.e., substantially concurrent with the orientation experienced by the perforating gun assembly) process while the perforating gun string is deployed in the wellbore, rather than retrieving the perforating gun string or running a camera down the wellbore (after retrieving the perforating gun string), each of which is time-consuming and does not ensure proper orientation before the operation.

In an aspect, the disclosure is directed to a method for orienting an individual perforating gun assembly relative to other perforating gun assemblies in a string. For example, an exemplary method includes providing a perforating gun assembly 900 such as in the exemplary embodiment(s) discussed above and, for brevity, not necessarily repeated in full. The perforating gun assembly 900 may include, among other things, the gun housing 910 including the first end 912 and the second end 914 opposite the first end, and the interior space 916 between the first end 912 and the second end 914. The charge carrier 920 may be positioned in the gun housing interior space 916, in a fixed orientation relative to the gun housing 910. The orientation alignment ring 930 may be connected to the gun housing first end 912 in an unfixed connection state.

The gun housing 910 and orientation alignment ring 930 may be rotated relative to each other, to a desired orientation of the gun housing 910 relative to the orientation alignment ring 930. The orientation alignment ring 930 may be fixed to the gun housing first end 912 by engaging the locking structure, such as set screws 936, through the locking structure holes 934, between the orientation alignment ring 930 and the gun housing first end 912. Locking the orientation alignment ring 930 to the gun housing first end 912 fixes the orientation of the gun housing 910 (and internal components such as the charge carrier 920, shaped charge 927, and initiator assembly 950) relative to the orientation alignment ring 930, in the fixed connection state. The initiator assembly 950 including an orientation sensor may be connected to the charge carrier 920 by, e.g., inserting the initiator assembly 950 into the initiator holder 400, including the charge carrier passage 929. Inserting the initiator assembly 950 may, in some embodiments, be done before the orientation alignment ring 930 is fixed to the gun housing first end 912, as safety and particular operations may allow. The gun housing second (female) end 914 may then be connected to, e.g., the adjacent, upstream orientation alignment ring connected to an adjacent, upstream perforating gun assembly. As the degree of the threaded connection, generally, between the orientation alignment ring and the gun housing second (female) end may be known, the fixed orientation of the gun housing 910 relative to the orientation alignment ring 930 may thereby provide a desired orientation of the gun housing 910 (and perforating gun assembly 900, generally) relative to the adjacent, upstream perforating gun assembly and other perforating gun assemblies in the tool string.

The locking ring 940 may then be connected to the gun housing first end 912, e.g., by a threaded connection as previously discussed, within the orientation alignment ring bore 932. Threading the locking ring 940 onto the gun housing first end 912 places a shoulder portion 991 of the orientation alignment ring 930 in abutting contact with a shoulder portion 992 of the locking ring 940 such that retention and tensile strength of the orientation alignment ring 930 in the perforating gun string is increased.

The method may further include connecting the perforating gun assembly 900 to an adjacent, downstream perforating gun assembly, by connecting the orientation alignment ring 930 to a gun housing second (female) end of the adjacent, downstream perforating gun assembly. The orientation alignment ring 930 may include seals, such as o-rings 969, for sealing, in part, the orientation alignment ring 930 to the gun housing of the adjacent, downstream perforating gun assembly. In an aspect, the step of connecting the orientation alignment ring 930 to the adjacent, downstream perforating gun assembly includes threadingly connecting the external threaded portion 933 of the orientation alignment ring 930 to the internal threaded portion of the gun housing second (female) end of the adjacent, downstream perforating gun.

In an aspect, the method may further include electrically contacting the electrical transfer assembly 964, i.e., the second pin connector end 968, and a line-in portion, such as the line-in terminal 212 of the initiator assembly 950, of the adjacent, downstream perforating gun assembly, when the orientation alignment ring 930 is connected to the adjacent, downstream perforating gun assembly. While the exemplary embodiment(s) of the perforating gun assembly include the line-in terminal 212 on the initiator assembly, the line-in portion may, in other embodiments, be a separate electrical relay or contact consistent with this disclosure.

This disclosure, in various embodiments, configurations and aspects, includes components, methods, processes, systems, and/or apparatuses as depicted and described herein, including various embodiments, sub-combinations, and subsets thereof. This disclosure contemplates, in various embodiments, configurations and aspects, the actual or optional use or inclusion of, e.g., components or processes as may be well-known or understood in the art and consistent with this disclosure though not depicted and/or described herein.

The phrases “at least one,” “one or more,” and “and/or” are open-ended expressions that are both conjunctive and disjunctive in operation. For example, each of the expressions “at least one of A, B and C,” “at least one of A, B, or C,” “one or more of A, B, and C,” “one or more of A, B, or C,” and “A, B, and/or C” means A alone, B alone, C alone, A and B together, A and C together, B and C together, or A, B, and C together.

In this specification and the claims that follow, reference will be made to a number of terms that have the following meanings. The terms “a” (or “an”) and “the” refer to one or more of that entity, thereby including plural referents unless the context clearly dictates otherwise. As such, the terms “a” (or “an”), “one or more” and “at least one” can be used interchangeably herein. Furthermore, references to “one embodiment”, “some embodiments”, “an embodiment” and the like are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Approximating language, as used herein throughout the specification and claims, may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related. Accordingly, a value modified by a term such as “about” is not to be limited to the precise value specified. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. Terms such as “first,” “second,” “upper,” “lower,” etc. are used to identify one element from another, and unless otherwise specified are not meant to refer to a particular order or number of elements.

As used herein, the terms “may” and “may be” indicate a possibility of an occurrence within a set of circumstances; a possession of a specified property, characteristic or function; and/or qualify another verb by expressing one or more of an ability, capability, or possibility associated with the qualified verb. Accordingly, usage of “may” and “may be” indicates that a modified term is apparently appropriate, capable, or suitable for an indicated capacity, function, or usage, while taking into account that in some circumstances the modified term may sometimes not be appropriate, capable, or suitable. For example, in some circumstances an event or capacity can be expected, while in other circumstances the event or capacity cannot occur—this distinction is captured by the terms “may” and “may be.”

As used in the claims, the word “comprises” and its grammatical variants logically also subtend and include phrases of varying and differing extent such as for example, but not limited thereto, “consisting essentially of” and “consisting of.” Where necessary, ranges have been supplied, and those ranges are inclusive of all sub-ranges therebetween. It is to be expected that the appended claims should cover variations in the ranges except where this disclosure makes clear the use of a particular range in certain embodiments.

The terms “determine,” “calculate,” and “compute,” and variations thereof, as used herein, are used interchangeably and include any type of methodology, process, mathematical operation or technique.

This disclosure is presented for purposes of illustration and description. This disclosure is not limited to the form or forms disclosed herein. In the Detailed Description of this disclosure, for example, various features of some exemplary embodiments are grouped together to representatively describe those and other contemplated embodiments, configurations, and aspects, to the extent that including in this disclosure a description of every potential embodiment, variant, and combination of features is not feasible. Thus, the features of the disclosed embodiments, configurations, and aspects may be combined in alternate embodiments, configurations, and aspects not expressly discussed above. For example, the features recited in the following claims lie in less than all features of a single disclosed embodiment, configuration, or aspect. Thus, the following claims are hereby incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this disclosure.

Advances in science and technology may provide variations that are not necessarily express in the terminology of this disclosure although the claims would not necessarily exclude these variations.

Claims

1. An orientable perforating gun assembly, comprising: a gun housing with a first end and a second end opposite the first end, and an interior space between the first end and the second end;a charge carrier positioned in the gun housing interior space, in a fixed orientation relative to the gun housing, the charge carrier including a first end nearest to the gun housing first end, and a second end opposite the first end and nearest to the gun housing second end;an initiator assembly positioned within an initiator holder, in a fixed orientation relative to the charge carrier, at the charge carrier second end, the initiator assembly including an orientation sensor, wherein the initiator holder and the initiator assembly are together configured for the initiator assembly to initiate at least one of a detonating cord or a shaped charge within the gun housing interior space; andan orientation alignment ring connected to the gun housing first end, whereinthe orientation alignment ring and the gun housing are rotatable relative to each other when the orientation alignment ring is in an unfixed connection state, and an orientation of the gun housing is fixed relative to the orientation alignment ring when the orientation alignment ring is in a fixed connection state.
2. The orientable perforating gun assembly of claim 1, further comprising a locking ring configured for connecting to the gun housing first end.
3. The orientable perforating gun assembly of claim 1, wherein the initiator assembly includes a key protrusion on a periphery of a housing of the initiator assembly and the initiator holder includes a recess on an outer peripheral wall of the initiator holder, and the key protrusion is received within the recess to orient the initiator assembly.
4. The orientable perforating gun assembly of claim 1, wherein the orientation sensor includes at least one of an accelerometer, an inclinometer, a gyroscope, or a magnetometer.
5. The orientable perforating gun assembly of claim 1, wherein the orientation sensor is configured to determine an orientation of the initiator assembly within the wellbore and thereby an orientation of the shaped charge.
6. The orientable perforating gun assembly of claim 1, wherein the initiator assembly includes a line-in terminal configured for electrical communication with a firing controller on a surface of the wellbore, wherein the orientation sensor is configured for sending real-time orientation information to the firing controller, via the line-in terminal.
7. A method for orienting an individual perforating gun assembly relative to other perforating gun assemblies in a string, comprising: providing the perforating gun assembly including: a gun housing including a first end and a second end opposite the first end, and an interior space between the first end and the second end,a charge carrier positioned in the gun housing interior space, and retaining a shaped charge, in a fixed orientation relative to the gun housing, andan orientation alignment ring connected to the gun housing first end in an unfixed connection state;rotating the gun housing to a desired orientation relative to the orientation alignment ring;fixing the orientation alignment ring to the gun housing first end by engaging a locking structure between the orientation alignment ring and the gun housing first end;inserting an initiator assembly including an orientation sensor into an initiator holder on the charge carrier; andconnecting the perforating gun assembly to an adjacent, upstream perforating gun assembly, by connecting the gun housing second end to an orientation alignment ring of the adjacent, upstream perforating gun assembly.
8. The method of claim 7, further comprising connecting a locking ring to the gun housing first end.
9. The method of claim 8, further comprising connecting the orientation alignment ring to a gun housing second end of an adjacent, downstream perforating gun assembly.
10. The method of claim 9, wherein the perforating gun assembly includes a pressure bulkhead including an electrical transfer assembly positioned at the gun housing first end, and the gun housing first end and the electrical transfer assembly are together dimensioned for electrically contacting the electrical transfer assembly and a line-in portion of the adjacent, downstream perforating gun assembly when the orientation alignment ring is connected to the gun housing second end of the adjacent, downstream perforating gun assembly, the method further comprising electrically contacting the electrical transfer assembly to the line-in portion of the adjacent, downstream perforating gun assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a bypass continuation of International Application No. PCT/EP2020/085624 filed Dec. 10, 2020, which claims priority to U.S. Provisional Application No. 62/945,942 filed Dec. 10, 2019, U.S. Provisional Application No. 63/001,766 filed Mar. 30, 2020, and U.S. Provisional Application No. 63/003,222, filed Mar. 31, 2020, the contents of each of which are incorporated herein by reference. This application is also a bypass continuation-in-part of International Application No. PCT/EP2021/058182 filed Mar. 29, 2021, which claims priority to U.S. application Ser. No. 17/206,416 filed Mar. 19, 2021 (issued as U.S. Pat. No. 11,339,614 on May 24, 2022), U.S. Design application Ser. No. 29/759,466 filed Nov. 23, 2020 (issued as U.S. Pat. No. D922,541 on Jun. 15, 2015), U.S. Provisional Application No. 63/002,507 filed Mar. 31, 2020, and U.S. Design application Ser. No. 29/729,981 filed Mar. 31, 2020 (issued as U.S. Pat. No. D903,064 on Nov. 24, 2020), the contents of each of which are incorporated herein by reference. This application is also a bypass continuation-in-part of International Application No. PCT/EP2021/079019 filed Oct. 20, 2021, which claims priority to U.S. Provisional Application 63/093,883 filed Oct. 20, 2020, the contents of each of which are incorporated herein by reference. This application is also a continuation-in-part of U.S. Design application Ser. No. 29/784,384 filed May 19, 2021, which is a continuation of U.S. Design application Ser. No. 29/781,925 filed May 3, 2021 (issued as U.S. Pat. No. D935,574 on Nov. 9, 2021), which is a continuation of U.S. Design application Ser. No. 29/755,354 filed Oct. 20, 2020 (issued as U.S. Pat. No. D921,858 on Jun. 8, 2021), which is a continuation-in-part of U.S. application Ser. No. 16/511,495 filed Jul. 15, 2019 (issued as U.S. Pat. No. 10,920,543 on Feb. 16, 2021), which is a continuation of U.S. application Ser. No. 16/272,326 filed Feb. 11, 2019 (issued as U.S. Pat. No. 10,458,213 on Oct. 29, 2019), which claims priority to U.S. Provisional Application No. 62/780,427 filed Dec. 17, 2018 and U.S. Provisional Application No. 62/699,484 filed Jul. 17, 2018, the contents of each of which are incorporated herein by reference

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Related Publications (1)

	Number	Date	Country
	20220307330 A1	Sep 2022	US

Provisional Applications (7)

Number	Date	Country
63093883	Oct 2020	US
63002507	Mar 2020	US
63003222	Mar 2020	US
63001766	Mar 2020	US
62945942	Dec 2019	US
62780427	Dec 2018	US
62699484	Jul 2018	US

Continuations (6)

	Number	Date	Country
Parent	29781925	May 2021	US
Child	29784384		US
Parent	17206416	Mar 2021	US
Child	PCT/EP2021/058182		US
Parent	PCT/EP2020/085624	Dec 2020	US
Child	17206416		US
Parent	29755354	Oct 2020	US
Child	29781925		US
Parent	29729981	Mar 2020	US
Child	PCT/EP2021/058182		US
Parent	16272326	Feb 2019	US
Child	29729981		US

Continuation in Parts (4)

	Number	Date	Country
Parent	PCT/EP2021/079019	Oct 2021	US
Child	17834417		US
Parent	29784384	May 2021	US
Child	PCT/EP2021/079019		US
Parent	PCT/EP2021/058182	Mar 2021	US
Child	29781925		US
Parent	29759466	Nov 2020	US
Child	17206416		US

Oriented perforating system

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Abstract