In order to determine the properties of a particular formation, a core sample may be extracted. For instance, a vertical wellbore may be created in a formation. A column of rock or other materials found in the formation may be extracted as the wellbore is made, and then removed from the wellbore, after which a detailed study may be performed. The detailed study and analysis may yield information and identify the lithology of the formation. Other characteristics such as porosity and permeability of the formation, the potential storage capacity and/or production potential for hydrocarbon-based fluids (e.g., oil and natural gas), and the like may also be determined from the core sample.
Coring systems may attempt to extract the core sample in a state that, to the extent possible, closely resembles the natural state in which the rock and other materials are found in the formation. For instance, a coring bit may be connected to a drill string and extended into a wellbore. The coring bit may include a central opening and, as the coring bit rotates and drills deeper into the formation, materials from the wellbore can enter through the central opening and form a column of rock in the drill string. When the column has a desired length, the column of rock may be retrieved and brought to the surface.
The column of rock forming the core sample may form directly within the drill string, and then be returned to the surface by lifting the coring bit towards the surface. In other systems, a core barrel may be lowered through the central opening in the drill string. A column of rock can form in the core barrel, and the core barrel can be retrieved. Another core barrel may then be lowered through the drill string and used to obtain another core sample from the vertical section of the formation
Assemblies, systems and methods of the present disclosure may relate to obtaining a core sample from a lateral section, or borehole, extending from a wellbore. In one example system, a coring system is provided to extract a core sample in a single trip. The example coring system may include a coring assembly that includes a coring bit attached to a core barrel. The core barrel may include a collection cavity where a core sample may be collected. The coring assembly may be connected to a deflector used to deflect the coring assembly as it drills a lateral section, ore borehole, and extracts the core sample. A releasable attachment between the coring assembly and the deflector may allow collective run-in of the coring assembly and deflector into a wellbore, and later separation to allow the coring assembly to drill the lateral section ore borehole and extract a coring sample.
In another implementation, a single-trip coring system may include a coring assembly having an outer core barrel coupled to a coring bit. A sacrificial element may connect the coring assembly to a deflector assembly with a ramp face. An anchor assembly may be coupled to the deflector assembly and may include expandable slips to engage a wall of the wellbore.
In another implementation, a method may be used to drill a lateral borehole and extract a core sample therefrom in a single trip. The method may include inserting a coring system into a wellbore within a formation, the coring system including a coring assembly coupled to a deflector assembly. The deflector assembly may be anchored within the wellbore and a coupling between the coring and deflector assemblies may be released. A lateral borehole may be drilled using the coring assembly. Drilling the lateral wellbore may result in simultaneously obtaining a core sample from the formation. The core sample and a portion of the coring assembly may then be removed from the borehole.
This summary is provided solely to introduce some features and concepts that are further developed in the detailed description. Other features and aspects of the present disclosure will become apparent to those persons having ordinary skill in the art through consideration of the ensuing description, the accompanying drawings, and the appended claims. This summary is therefore not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claims.
In order to describe various features and concepts of the present disclosure, a more particular description of certain subject matter will be rendered by reference to specific embodiments which are illustrated in the appended drawings. Understanding that these drawings depict example embodiments and are not to be considered to be limiting in scope, nor drawn to scale for each embodiment contemplated herein, various embodiments will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
In accordance with some aspects of the present disclosure, embodiments herein relate to systems and assemblies for extracting a core sample from a formation. More particularly, embodiments disclosed herein may relate to systems, assemblies and methods for extracting a core sample from a lateral section, borehole, or other deviated portion of a wellbore. Further embodiments may also relate to extracting a core sample closely resembling the natural state of the formation, and of a size allowing for study and analysis, while minimizing or eliminating compaction, fracture, or other deformation of the core sample. More particularly still, embodiments disclosed herein may relate to single-trip systems and assemblies for anchoring a deflector, extracting a core sample from a lateral section, and retrieving the deflector and coring assembly.
Some principles and uses of the teachings of the present disclosure may be better understood with reference to the accompanying description, figures and examples. It is to be understood that the details set forth herein and in the figures are presented as examples, and are not intended to be construed as limitations to the disclosure. Furthermore, it is to be understood that the present disclosure and embodiments related thereto can be carried out or practiced in various ways and that aspects of the present disclosure can be implemented in embodiments other than the ones outlined in the description below.
To facilitate an understanding of various aspects of the embodiments of the present disclosure, reference will be made to various figures and illustrations. In referring to the figures, relational terms such as, but not exclusively including, “bottom,” “below,” “top,” “above,” “back,” “front,” “left,” “right,” “rear,” “forward,” “up,” “down,” “horizontal,” “vertical,” “clockwise,” “counterclockwise,” “inside,” “outside,” and the like, may be used to describe various components, including their operation and/or illustrated position relative to one or more other components. Relational terms do not indicate a particular orientation or position for each embodiment contemplated herein. For example, a component of an assembly that is “below” another component while within a wellbore may be at a lower elevation while in a vertical portion of a wellbore, but may have a different orientation during assembly, or when the assembly is in a lateral or deviated portion a the borehole, when outside of the borehole or wellbore, during manufacture, or at other times. Accordingly, relational descriptions are intended solely for convenience in facilitating reference to some embodiments described and illustrated herein, but such relational aspects may be reversed, rotated, moved in space, placed in a diagonal orientation or position, placed horizontally or vertically, or similarly modified.
Relational terms may also be used to differentiate between similar components; however, descriptions may also refer to certain components or elements using designations such as “first,” “second,” “third,” and the like. Such language is also provided for differentiation purposes, and is not intended limit a component to a singular designation. As such, a component referenced in a description of a particular embodiment as the “first” component may be the same component that may be referenced in the claims as a “second,” “third,” or other component. Furthermore, to the extent the description refers to “an additional” or “other” element, feature, aspect, component, or the like, it does not preclude there being one such element, feature, aspect, component, or the like in other embodiments. Where the claims or specification refer to “a” or “an” element, such reference is to be inclusive of other components and understood as “one or more” of the element. No component, feature, structure, or characteristic is to be considered as required or essential unless explicitly stated as such for each embodiment of the present disclosure.
Technical and scientific terms used herein are to have a meaning as understood by a person having ordinary skill in the art to which embodiments of the present disclosure belong, unless otherwise defined. Embodiments of the present disclosure can be implemented in the testing or practice with methods and materials equivalent or similar to those described herein.
Referring now to
In the particular embodiment illustrated in
The coring assembly 106 may be separable from the deflector assembly 108 in an embodiment in which the coring assembly 106 is connected to the deflector assembly 108 and/or the anchor assembly 110. By way of illustration, a selectively engageable latch or other mechanism may be used to selectively connect and/or disconnect the coring assembly 106 relative to a deflector 116 of the deflector assembly 108. In other embodiments, and as described in greater detail hereafter, a sacrificial element may be used to connect the coring assembly 106 to the deflector assembly 108. For instance, once the anchor assembly 110 is secured at an axial and/or rotational position within the wellbore 102, axial and/or rotational movement of the coring assembly 106 may be used to break a sacrificial element, thereby disconnecting the coring assembly 106 from the deflector 116.
While the coring assembly 106, deflector assembly 108, and anchor assembly 110 may be collectively run into the wellbore 102 to allow a single trip to insert, anchor, and use such assemblies, such an embodiment is merely illustrative. In other embodiments, for instance, the coring assembly 106 may be separate from the deflector assembly 108. In such an embodiment, the anchor assembly 110 may be anchored in place. Thereafter, the coring assembly 106 may be run into the wellbore 102. Of course, the deflector assembly 108 may be run into the wellbore 102 and secured in a desired position and orientation collectively with the anchor assembly 110, or run in and secured in place following insertion and/or anchoring of the anchor assembly 110.
Regardless of whether the coring assembly 106 is connected to the anchor assembly 110 and/or deflector assembly 108 to allow for single-trip extraction of a core sample, the coring assembly 106 may use the deflector assembly 108 to extract a core sample from the wellbore 102, and potentially a deviated or lateral section of the wellbore 102 as discussed hereafter. For instance, as shown in
In particular, the coring bit 118 may include an opening 124 in a distal end thereof, which opening 124 may be in communication with a collection chamber 126 within the coring bit 118 and/or the outer barrel 120. The coring bit 118 and the outer barrel 120 may be connected to a drill rig (not shown) that can rotate the coring bit 118, optionally by also rotating the outer barrel 120 and/or a drill string (not shown) attached to the outer barrel 120. As one or more cutters 128 on the coring bit 118 cut into the formation 104, materials from the formation may collect within the collection chamber 126 to form a columnar core sample. When the coring bit 118 has cut deep enough to fill the collection chamber 126, or otherwise obtain a sample for study, the core sample can be removed. To remove the core sample, the entire coring assembly 106 could be withdrawn from the wellbore 102.
In another embodiment, however, a core sample may be obtained and removed without corresponding removal of the coring assembly 106. For instance, in this particular embodiment, an inner barrel 130 may be located within the collection chamber 126. The inner barrel 130 may be selectively removable and can include an interior opening which may also act as a collection chamber. As shown in
A core sample collected within the collection chamber 126 of the outer barrel 120 or the inner barrel 130 may have any suitable size and shape. For instance, as discussed herein, a length of the collected core sample may vary from a few inches to many hundreds of feet. The width of the core sample may also vary. For instance, the opening 124 and collection chamber 126 (or the interior of the inner barrel 130) may have a width from about one inch (25 mm) to about four inches (102 mm). In a more particular embodiment, the inner barrel 130 and/or outer barrel 120 may collect a core sample having a width greater than two inches (51 mm), which can facilitate measuring porosity of the formation 104. Of course, in other embodiments, the core sample may have a width or diameter less than one inch (25 mm) or greater than four inches (102 mm). Moreover, while the core sample may have a circular cross-sectional shape in some embodiments, the outer barrel 120 and/or inner barrel 130 may in other embodiments facilitate collection of a columnar core sample having a square, elliptical, trapezoidal, or other cross-sectional shape.
The coring assembly 106 may include any number of additional or other components. For instance, the inner barrel 130 and collection chamber 126 may be illustrated in
As also seen in
In another embodiment, fluid passing through the hydraulic line 134 and/or the channel 138 may be used for additional or other purposes. For instance, the embodiment shown in
More particularly, as noted above, some embodiments of the present disclosure relate to using the coring assembly 106 to extract a core sample from a lateral section or perforation of the wellbore 102. Turning now to
In general, the deflector 116 may be used to deflect the coring assembly 106 laterally to create a deviated or lateral section 103 in the wellbore 102. As the deflection occurs, the coring assembly 106 may drill laterally into the formation 104 and extract a core sample from the lateral section 103 of the wellbore 102, as opposed to a vertical or other primary section of the wellbore 102. In
Further, while the ramp face 140 may have a single segment extending at a constant incline, in other embodiments the ramp face 140 may have multiple segments. In this particular embodiment, for instance, the ramp face 140 is shown as including at least two segments, each with a different degree of incline. In other embodiments, however, the ramp face 140 may include three or more segments, any or each of which may have a different incline relative to other segments.
As the coring assembly 106 is detached from the deflector 116, or when inserted into the borehole following anchoring of the anchor assembly 110 and the deflector assembly 108, the coring bit 118 may come into contact with the ramp face 140. Because of the angle on the ramp face 140, further downward movement of the coring assembly 106 may cause the coring bit 118 to travel across the ramp face 140, and gradually move towards the sidewall of the wellbore 102. The coring bit 118 may optionally rotate as it moves along the ramp face 140 and/or as it engages the sidewall of the wellbore 102. Using cutting elements, the coring bit 118 may then cut laterally into the wellbore 102 and form the lateral section 103.
As discussed herein, when the coring bit 118 forms the lateral section 103 of the borehole, rock and other materials of the formation 104 may pass through an opening 124 in the coring bit 118 and collect within the collection chamber 126 and/or an inner barrel 130. Ultimately, once a core sample of a desired size has been collected (e.g., when the inner barrel 130 is filled or near filled), the core sample may be extracted. Extraction of the core sample may occur with or without removal of the coring assembly 106, as discussed herein.
One aspect of a coring system 100 of the present disclosure may therefore include the ability to extract a core sample from a deviated portion of a borehole, with such sample having any desired length. Indeed, in some embodiments, a core sample extracted using the coring system 100 may extend many hundreds of feet (e.g., 1000 feet, 2000 feet, or more) into the lateral section 103 of the wellbore 102. In other embodiments however, the core sample may be much shorter (e.g., less than 1000 feet in some embodiments, less than 100 feet in other embodiments, and less than 50 feet in still other embodiments). As an example, if an operator of the coring system 100 wishes to obtain a sample of the formation three feet (0.9 m) away from the wellbore 102, as measured in a direction perpendicular to the wellbore 102, and the lateral section 103 extends at a constant angle of 3° relative to the longitudinal axis of the wellbore 102, a core sample of about sixty feet (18.3 m) should provide the desired information. Of course, if angle of the lateral section 103 is greater or smaller than 3°, or varies along its length, or if the desired information is nearer or further from the primary portion of the wellbore 102, the length of the core sample may vary. Further, while the illustrated wellbore 102 is shown as vertical, a wellbore may not be vertical; however, the coring system 100 may be used to drill a lateral, deviated section, or borehole, off of even a non-vertical wellbore to obtain a core sample.
While some formations may have relatively constant properties over large distances, other formations may show large deviations over even short distances. Accordingly, by extending the coring assembly 106 laterally from the primary portion of the wellbore 102, a core sample may therefore be obtained to capture formation properties further from the main wellbore 102. Gradients and other changes in properties may therefore be analyzed and determined. Further, because core samples may be of virtually any continuous length, core samples may be relatively unfractured and large enough to allow for simplified analysis. Further still, as continuous core samples are obtained through a coring bit 118, the coring system 100 may operate with few or no explosives that could otherwise create fractured or compacted core samples.
While a core sample may be obtained over a lateral section 103 that extends a relatively short distance from the primary portion of the wellbore 102, the length may be much larger as noted above. Indeed, the lateral section 103 may extend for potentially hundreds of feet as discussed herein. Optionally, to facilitate lateral drilling of the lateral section 103, the coring assembly 106 may use directional drilling equipment. While not shown in
As discussed above, some aspects of the present disclosure further relate to a coring system that allows a core sample to be taken in a deviated portion of a borehole, while also using a single trip to anchor the deflection assembly and obtain the core sample. Some systems may also allow detachment and retrieval of the deflection assembly in the same, single trip. Turning now to
More particularly,
The coring assembly 206 and deflector assembly 208 may be placed in the wellbore 202, and lowered to a desired location. The deflector assembly 208 may include a deflector 216 with a ramp face 240. When the ramp face 240 is oriented in a direction corresponding to a desired trajectory for a lateral section of the wellbore 202, the deflector assembly 208 can be anchored in place. Following anchoring of the deflector assembly 208, the coring assembly 206 can be separated from the deflector assembly 208 and moved along the length of the ramp face 240 to create the lateral section or borehole off the wellbore 202, and to take a core sample.
In the particular embodiment shown in
In another embodiment, the coring assembly 206 may rotate to break the sacrificial element 242. By way of illustration, the coring bit 218 and/or outer barrel 220 of the coring assembly 206 may be configured to rotate to drill a lateral section of the wellbore 202. In this embodiment, the coring bit 218 may be integrated with the outer barrel 220, and the sacrificial element 242 may break when the rotational force is applied to the outer barrel 220 (e.g., by a surface rig). Regardless of whether the sacrificial element 242 breaks as a result of axial loading, rotation of the coring assembly 206, or in some other manner, the coring assembly 206 may break free from the deflector assembly 208 and be allowed to move axially along the wellbore 202.
The sacrificial element 242 may take any number of different forms. In
Once the sacrificial element 242 is broken, an operator of the coring system 200 may move the coring assembly 206 downwardly, further into the wellbore 202. Upon doing so, the coring assembly 206 may move along a ramp face 240 of the deflector system 208, and can be directed against the interior surface of the wellbore 202. The coring bit 218 can rotate or otherwise be used to cut into the formation 204 and create a lateral section of the wellbore 202. As shown in
As the coring bit 218 cuts into the formation 204 and forms the lateral section 203 of the wellbore 202, the coring bit 218 may extract samples of the formation 204. In this particular embodiment, the coring bit 218 and the outer barrel 220 of the coring assembly 206 define a collection chamber 226 that is accessible through an opening 224 in the distal end of the coring bit 218. A core sample may therefore collect in the collection chamber 226 for removal either with the coring assembly 206, or independent from removal of the coring assembly 206 (e.g., using an inner barrel). Multiple core samples may also be obtained without removing the coring assembly 206 as discussed in greater detail with respect to
When the desired core samples have been obtained, an operator of the coring system 200 may remove the coring assembly 206. As shown in
In the embodiment shown in
The sleeve 246 of the deflector assembly 208, and the collar 244 of the coring assembly 206, may be formed or constructed in any number of manners. For instance, the sleeve 246 may be integrally formed with the deflector 216. In another embodiment, such as that shown in
In embodiments in which the sleeve 246 is static and the coring assembly 206 passes through the sleeve 246, the sleeve 246 may also be a bearing, or may include one or more bearings or bearing surfaces. For instance, the sleeve 246 may include one or more bearings or bushings to reduce friction as the coring assembly 206 moves axially within the opening in the sleeve 246 or to reduce friction as a result of the coring assembly 206 rotating within the opening in the sleeve 246. An example bearing that may be included as part of the sleeve 246, or connected thereto, may include a thrust bearing, roller bearing, spherical bearing, or other bearing, or some combination thereof. In an example embodiment using a spherical bearing, the bearing may allow angular deflection of the outer barrel 220 while the outer barrel 220 and coring bit 218 travel along the ramp face 240 of the deflector assembly 208 to drill a lateral section into the wellbore 202. A spherical bearing may also be used to support axial, sliding motion of the outer barrel 220 as coring assembly 206 moves in an upwardly or downwardly directed path.
The fastener 250 used to connect the sleeve 246 to the deflector 216 may also have additional or other properties or structures. For instance, rather than a mechanical fastener, the sleeve 246 may be secured in place using other mechanisms, including mechanical attachments such as welding, adhesives, thermal bonding, threaded connectors, and the like. Regardless of the particular type of attachment used to connect the sleeve 246 to the deflector 216, the attachment may have a greater structural strength when compared to the sacrificial element 242. In one embodiment, a greater structural strength of the fastener 250 or other mechanical attachment may be used to allow the sacrificial element 242 to break prior to failure of the fastener 250, to ensure that the coring assembly 206 can break free of the deflector 216, and remain guided by the fixed sleeve 246.
Another aspect of the present disclosure, as shown in
Turning now to
In general, the coring system 300 of
In the particular embodiment shown in
In general, the coring bit 318 may act in a manner similar to other coring bits described herein. In
In
The collar 344 may be used to guide the coring bit 318 in accordance with some embodiments of the present disclosure. In this particular embodiment, for instance, the deflector 316 of the deflector assembly 308 may include a track 340 for interfacing with the collar 344. The shape, size, and configuration of the track 340 may match that of the collar 344. For instance, the track 340 may have a concave surface with a contour to match an outer contour of the collar 344. In another embodiment, the track 340 may include a rail, guide, or other similar component that may correspond to the collar 344 and/or facilitate movement of the collar 344 along the track 340.
As the collar 344 moves downwardly and laterally along the track 340, the coring bit 318 may also move. The track 340 may be inclined relative to the longitudinal axis of the wellbore 302, thereby causing the coring bit 318 to ultimately engage a sidewall of the wellbore 302. By rotating the coring bit 318, the coring bit 318 can also cut into the sidewall at a trajectory corresponding to the configuration of the track 340. As shown in
Once the desired core samples are obtained, the coring assembly 306 may be removed as shown in
When pulling upwardly on the outer barrel 326, the coring assembly 306 may be used to retrieve the deflector assembly 308 from the wellbore 302. For instance, as discussed herein, the deflector assembly 308 may be selectively released from its anchored position within the wellbore 302. Following un-anchoring of the deflector assembly 308 (e.g., by releasing an anchor assembly connected to the deflector assembly 308), an upwardly-directed force on the coring assembly 306 may also cause the deflector assembly 308 to move upwardly by virtue of the engagement between the collar 344 and the shoulder 346.
The collar 344 of the embodiment shown in
As should be appreciated by a person having ordinary skill in the art in view of the disclosure herein, some embodiments of the present disclosure may relate to apparatus, systems, and methods for anchoring a deflector and extracting a core sample in a single trip. In accordance with some of those embodiments, the deflector may also be anchored and thereafter un-anchored to allow setting and retrieval in the same, single trip.
An example anchor assembly 410 that may be used in connection with embodiments of the present disclosure is shown in additional detail in
The anchor assembly 410 may generally comprise a top sub 454 connected via threads 456 to a generally cylindrical mandrel 457 having a fluid channel 466 therethrough, which in turn is connected via threads 456 to a nose 458. In one embodiment, the anchor assembly 410 may include an upper box connection 460 and a lower pin connection 462 for connecting the anchor assembly 410 into a downhole assembly. The upper box connection 460 may be connected to the lower end of a deflector assembly 408, for example. Optionally, a pipe plug 464 may be connected to the nose 458 to close off a fluid channel 466 of the mandrel 457 so that the anchor assembly 410 may be expanded hydraulically.
The mandrel 457 may be the innermost component within the anchor assembly 410. Disposed around and slidingly engaging the mandrel 457 is a spring stack 468 in the illustrated embodiment, along with an upper slip housing 470, one or more slips 414, and lower slip housing 472. One or more recesses 474 may be formed in the slip housings 470, 472 to accommodate the radial movement of the one or more slips 414. The recesses 474 may include angled channels formed into the wall thereof, and these channels may provide a drive mechanism for the slips 414 to move radially outwardly into the expanded positions depicted in phantom lines in
In the embodiment shown in
Referring now to
To actuate the anchor assembly 410, hydraulic forces may be applied to cause the slips 414 to expand radially outwardly from the locked and collapsed position of
Pressure may continue to build in the fluid chamber 478 as the piston 480 provides a seal therein until the pressure is sufficient to cause shear screws 492 to shear. Since the piston 480 may be connected to the mandrel 457, the piston 480 may remain stationary while the outer piston housing 476 and the lower slip housing 472 connected thereto may move axially upwardly from the position shown in
Because the outer piston housing 476 may be moveable to expand the slips 414 rather than the piston 480, the anchor assembly 410 design may not use a redundant piston stroke, and the anchor assembly 410 may maintain approximately the same axial length in the collapsed position of
The anchor assembly 410 may also be configured for operation within wellbores having a range of diameters. In an embodiment, a spacer screw 496 may be provided to maintain a space between the lower slip housing 472 and the upper slip housing 470 when the anchor assembly 410 is in its maximum expanded position. During assembly of the anchor assembly 410, when installing the slips 414, the upper slip housing 470 and the lower slip housing 472 may be abutted against each other, and extensions in the slips 414 may be aligned with the channels 494 in the recesses 474 of the slip housings 470, 472. Then the upper and lower slip housings 470, 472 may be pulled apart and the slips 414 can collapse into the anchor assembly 410 around the mandrel 457. To guard against the anchor assembly 410 overstroking downhole, the spacer screw 496 can restrict the upper and lower slip housing 470, 472 from abutting together as during assembly, thereby restricting the slips 414 from falling out of the anchor assembly 410. Thus, in the maximum expanded position, the spacer screw 496 may provide a stop surface against which the lower slip housing 472 may be restricted, and potentially prevented, from further upward movement so that it remains spaced apart from the upper slip housing 470. The spacer screw 496 can be provided as a safety mechanism because the slips 414 should engage the wellbore wall in an intermediate expanded position, well before the lower slip housing 472 engages the spacer screw 496.
Thus, the anchor assembly 410 may be fully operational over a wide range of diameters, and can have an expanded position that varies depending on the diameter of the wellbore. As such, the anchor assembly 410 may be specifically designed to provide proper anchoring of a coring, drilling, or other assembly to withstand compression, tension, and torque for a range of wellbore diameters. Specifically, the anchor assembly 410 is configured to expand up to at least 1.5 times the collapsed diameter of the anchor assembly 410. For example, in one embodiment, the anchor assembly 410 has a collapsed diameter of approximately 8.2 inches (208 mm) and is designed to expand into engagement with an 8½ inch (216 mm) diameter wellbore up to a 12¼ inch (311 mm) diameter wellbore. Where the anchor assembly 410 is used in a cased wellbore, an anchor assembly 410 having a diameter of approximately 8.2 inches (208 mm) may correspond generally to a 9⅝ inch (244 mm) casing up to 13⅜ inch (340 mm) casing.
Once the slips 414 are expanded into gripping engagement with a wellbore, to prevent the anchor assembly 410 from returning to a collapsed position until so desired, the anchor assembly 410 may include a locking subassembly 482. As the piston housing 476 moves, so too may a lock housing 488 that is connected thereto via shear screws 486 mounted about the mandrel 457. As shown in
In an embodiment, the locking nut 490 may be machined as a hoop and then split into multiple segments. A spring 498 (e.g., a garter spring) may be provided to hold the segments of the locking nut 490 around the mandrel 457. The spring 498 may resemble an O-ring, except that the spring 498 can be made out of wire. Such wire may be looped around the locking nut 490, and the ends can be hooked together. The spring 498 may allow the sections of the locking nut 490 to open and close as the locking nut 490 jumps over each individual serration as it moves upwardly on the mandrel 457. Thus, the spring 498 may allow the locking nut 490 to slide up the ramp of a mandrel serration and jump over to the next serration, thereby ratcheting itself up the mandrel 457. The spring 498 can also hold the locking nut 490 segments together so that the locking nut 490 cannot back up over the serrations on the mandrel 457.
The anchor assembly 410 may also designed to return from an expanded position to a released, collapsed position. For instance, as discussed herein with respect to the coring systems 100, 200, and 300, some embodiments of a coring system contemplate a system in which an anchor may be set (e.g., expanded), a core sample extracted, the anchor released (e.g., retracted), and a coring assembly and anchor retrieved, within a single trip. The anchor assembly 410 may therefore be used in such embodiments to allow the anchor to be released, which may allow another component, such as a deflector assembly, to be released and retrieved.
The anchor assembly 410 of
In accordance with one embodiment, the anchor assembly 410 of
When a core sample has been obtained, the anchor assembly 410 may be released by applying an upwardly directed force to retract the slips 414 as discussed herein. For instance, as shown in
Accordingly, the various embodiments disclosed herein include components and structures that are interchangeable, and may be combined to obtain any number of aspects of the present disclosure. For instance, in a single trip, a deflector may be anchored in place, a core sample extracted, the deflector released, and the deflector and coring assembly removed. In the same or other embodiments, the coring system may potentially be used at multiple locations along a wellbore. For instance, the deflector and coring assembly may be lowered to a desired location and anchored in place. The coring assembly may then be used to extract a core sample, and the deflector can be released. The coring assembly and deflector may then be raised or lowered to another location, where the process is repeated by anchoring the deflector, extracting a core sample, and potentially releasing the anchored deflector. Such a process may be repeated multiple times to obtain core samples at multiple vertical locations, and within a single trip.
To facilitate obtaining core samples at multiple locations in a single trip, the anchor assembly 410 may be modified in a number of different manners. For instance, a motor, power source, and wireless transponder may be provided. The motor may mechanically move the slips 414 and/or the mandrel 457 to allow selective expansion and retraction of the slips 414. Thus, the shear screws 486 are optional, and multiple engagements may occur along a length of a wellbore.
Although only a few example implementations have been described in detail above, those skilled in the art will readily appreciate that many modifications are possible in the example implementation without materially departing from the disclosure of “Singe-Trip Lateral Coring Systems and Methods.” Accordingly, any such modifications are intended to be included in the scope of this disclosure. Likewise, while the disclosure herein contains many specifics, these specifics should not be construed as limiting the scope of the disclosure or of any of the appended claims, but merely as providing information pertinent to one or more specific implementations that may fall within the scope of the disclosure and the appended claims. Any described features from the various implementations disclosed may be employed in combination. In addition, other implementations of the present disclosure may also be devised which lie within the scopes of the disclosure and the appended claims. Additions, deletions and modifications to the implementations that fall within the meaning and scopes of the claims are to be embraced by the claims.
In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. Thus, although a nail and a screw may not be structural equivalents in that a nail employs a cylindrical surface to secure wooden parts together, whereas a screw employs a helical surface, in the environment of fastening wooden parts, a nail and a screw may be equivalent structures. It is the express intention of the applicant not to invoke 35 U.S.C. §112, paragraph 6 for any limitations of any of the claims herein, except for those in which the claim expressly uses the words ‘means for’ together with an associated function.
Certain implementations and features may have been described using a set of numerical upper limits and a set of numerical lower limits. It should be appreciated that ranges including the combination of any two values, e.g., the combination of any lower value with any upper value, the combination of any two lower values, and/or the combination of any two upper values are contemplated unless otherwise indicated. Certain lower limits, upper limits and ranges may appear in one or more claims below. Numerical values are “about” or “approximately” the indicated value, and take into account experimental error and variations that would be expected by a person having ordinary skill in the art.
This application claims the benefit of, and priority to, U.S. patent application Ser. No. 61/736,982, filed on Dec. 13, 2013 and entitled “SINGLE-TRIP LATERAL CORING SYSTEMS AND METHODS,” which application is incorporated herein by this reference in its entirety.
Number | Date | Country | |
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61736982 | Dec 2012 | US |