Multiple Unit Piercing Tool

Abstract

The present disclosure relates to a device and a method for piercing casing for oil wells, gas wells, geothermal wells and water wells. The device of this disclosure comprises a multiple chambered piercing assembly, which separates piercing units without threaded connections between each unit.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable.

BACKGROUND OF THE DISCLOSURE

1. Field of the Disclosure

The present disclosure relates generally to tools used to pierce well casing to allow fluids to pass into and out of a wellbore annulus.

2. Background Art

Currently, there are a number of solutions for well piercing tools. These typically use shaped explosive charges to pierce a well bore casing. The piercing shaped charges and ancillary components are contained within a sealed unit. Some of these solutions attempt to connect each individual unit together with threaded connections, but these solutions fail to meet the needs of the industry because the threaded connection between each unit adds length, material, cost and complexity. Typically, this has been done with a box by box barrel with a pin by pin sub between each unit. Other solutions attempt to eliminate the sub by creating a box by pin barrel, but these solutions are similarly unable to meet the needs of the industry because there is still a threaded connection between each unit adding to the length and cost. Still, other solutions seek to put shaped charges in a planer configuration to shorten the units, but these solutions also fail to meet industry needs because they significantly decrease the shape charge size sacrificing pierce depth and performance for a shorter assembly. Manufacturing costs with all of the existing systems remain high due to complexity and material costs.

SUMMARY OF THE DISCLOSURE

The present disclosure relates to a device and a method associated with tools designed to pierce casing for the oil, gas, geothermal and water wells. With respect to the device, it is a multiple chambered piercing assembly, which separates piercing units without threaded connections between each unit, allowing for a lower cost, more compact design compared to current tube piercing systems on the market today. Due to the reduced length this device can be used to increase the number of chambers put into a single tool string for piercing the casing in more spread out locations along a well zone, thereby allowing a more evenly distributed fluid outflow or inflow from the formation while maintaining limited hole entry through the casing.

The core components of the invention are an external tube, short segmented internal tubes, and divider pucks on each end of the shorter tube segments. The pucks will include of an electrical pass through pressure barrier and will contain a thinner internal tube (carrier tube), shape charge, and a detonator. The carrier tube will hold and align a shape charge and detonation system with the outer sleeve. Generally speaking, one set of units of this system will be configured as follows: the outer sleeve will be threaded and cap on both ends with electrical feed through. Multiple units will be inserted into the outer sleeve with sealed chambers in between each unit. A unit will include an inner sleeve with a divider puck on each side. The divider puck will seal on the inner diameter (“ID”) of each inner sleeve as well as provide a bore to pass an insulated electrical signal through that will double as a pressure barrier. Between the pucks inside each inner sleeve section is a pressure sealed chamber with one or more shape charges that will reside with an explosive initiation system. The explosive initiation system in one form may include a detonator, detonation cord, and an addressable switch.

With respect to the device, it should be further noted that any number of units can be placed inside the outer sleeve depending on the job requirements and only limited by physical constraints from other systems. With respect to the associated method, in order to carry out the method the following core steps are followed: the outer sleeve will be capped off on one side. All of the units will be assembled one by one and placed inside of the outer sleeve. Once the outer sleeve is completely filled with units, the open side of the outer sleeve will be capped. The capped ends of the outer sleeve will have an electrical pass through that can either be tied to another outer sleeve assembly or a different tool in a wireline tool string. For example, a setting tool on the bottom (side B) and a cable head at the top (side A). “Top” is in reference to the last portion of the assembly that will enter the well bore when traversing from the surface into the ground while “bottom” is the first portion of the assembly that will enter. The assembly will then be drawn into a pressure chamber using a high tension cable. The pressure chamber is then placed onto the well head and then the pressures equalized between the chamber and the well bore. The assembly is then pumped down into the well where piercings are desired in the casing to allow fluids to flow into and out of the casing. The bottom most unit in the outer sleeve will be initiated first, setting off all of the shape charges within the unit's chamber. Each unit above the previous will be initiated in order until all of the units are detonated. The assembly will then be pulled to the surface and the pierced zone of the well may be hydraulically fractured. Ultimately, at the conclusion of these steps an advanced multiple unit piercing assembly will be assembled and used in the well to put holes in the casing enabling fluid to enter or exit the annulus of the well.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is an exploded isometric view of a single unit.

FIG. 2 is a cross sectional view of a single unit-sub assembly.

FIG. 3 is a cross sectional view of a puck with insulated pressure barrier with electrical feed through.

FIG. 4 is a cross sectional view of an outer sleeve.

FIG. 5 is a cross sectional view of multiple unit piercing assembly with three complete units.

FIG. 6 is an isometric view of a puck with charge tube orienting holes on the face.

DEFINITIONS USED IN THE DISCLOSURE

The term “at least one”, “one or more”, and “one or a plurality” mean one thing or more than one thing with no limit on the exact number; these three terms may be used interchangeably within this disclosure. For example, at least one device means one or more devices or one device and a plurality of devices.

The term “about” means that a value of a given quantity is within ±20% of the stated value. In other embodiments, the value is within ±15% of the stated value. In other embodiments, the value is within ±10% of the stated value. In other embodiments, the value is within ±7.5% of the stated value. In other embodiments, the value is within ±5% of the stated value. In other embodiments, the value is within ±2.5% of the stated value. In other embodiments, the value is within ±1% of the stated value.

The term “substantially” or “essentially” means that a value of a given quantity is within ±10% of the stated value. In other embodiments, the value is within ±7.5% of the stated value. In other embodiments, the value is within ±5% of the stated value. In other embodiments, the value is within ±2.5% of the stated value. In other embodiments, the value is within ±1% of the stated value. In other embodiments, the value is within ±0.5% of the stated value. In other embodiments, the value is within ±0.1% of the stated value.

Terms and phrases used in this disclosure, and variations thereof, unless otherwise expressly stated, should be construed as open-ended as opposed to limiting. As examples of the foregoing: the term “including” should be read as meaning “including, without limitation” or the like, the term “example” is used to provide exemplary instances of the item in discussion, not an exhaustive or limiting list thereof, the terms “a” or “an” should be read as meaning “at least one,” “one or more,” “one or a plurality” or the like.

DETAILED DESCRIPTION OF THE DISCLOSURE

As described herein, it is desirable to provide a device that has the shortest unit length possible and a low manufacturing cost. Furthermore, it is desirable to not require twisting of components relative to each other while assembling the components at risk of damaging wires. Also, it is desirable to have a system that can orient the charges along its axis simply by pushing them together with a simple orienting mechanism. Therefore, there currently exists a need in the industry for a device that eliminates the majority of the threaded connections between most units. Similarly, it is desirable to have an associated method that eliminates orienting mechanisms that are challenging to implement or that add significant length to the system. Therefore, there currently exists a need in the industry for a process that assembles multiple units of shorter length into a single long outer sleeve as described here.

Disclosed herein is a multiple unit piercing assembly, which is made up of the following components: (1) an outer sleeve; (2) segmented internal tubes; (3) puck dividers that encapsulate a shape charge(s); and, in one embodiment, (4) an explosive initiation system. These components are assembled into a single unit with multiple units (sub-assemblies) contained within the outer sleeve. This is done as follows: an outer sleeve is used to encapsulate all of the internal components. Caps are mechanically attached to both sides of the outer sleeve to restrain all of the components in tension as explosives in each unit are initiated. The outer sleeve can, but does not need to be sealed off from wellbore pressure. A set of inner sleeves with pucks between and on both sides are placed inside of the outer sleeve. The pucks interface with the outer sleeve as well as the inner sleeve. The puck's interface would ideally seal on the outer sleeve end caps as well as the inner sleeves forming a pressure sealed unit comprising an inner sleeve between two pucks. Each inner sleeve will encapsulate a shape charge(s) as well as an explosive initiation assembly in one of the embodiments. The pucks will also have at least one electrical pass through that enables a signal to be passed into the chamber to initiate the explosives. Similarly, multiple unit piercing assembly comprises the following steps: affixing a cap to the outer sleeve, assembly and insertion of each unit sub assembly until the outer sleeve is full, affixing a cap to the open end of the outer sleeve, attachment of the cable both electrically and mechanically to the multiple unit piercing assembly(s), running the multiple unit piercing assembly into the well and initiating each unit individually starting at the bottom and working to the top until all units are spent. At which point the assembly is brought to the surface for disposal. The well can now pass fluid into or out of the casing annulus.

The device of this disclosure may also have one or more of the following: (1) ported or scalloped outer sleeve to minimize the protrusion of burrs past the major outside diameter after shape charges are initiated and pierce the inner sleeve, (2) multiple electrical pass through pressure barriers on a puck to allow additional signals or detonator initiation voltage to be passed through upper units without charge initiation, (3) oriented shape charges that align the shape charges between each unit as well as to features of the outer sleeve, (4) one of more shape charges per unit allowing one or more holes to be pierced in the casing with the initiation of a single unit. (5) Sealing between units could be done between the major outside diameter of the pucks and the inside diameter of the outer tube or sealing on the inner sleeve as well as the pucks. Similarly, the associated method may also include one or more of the following steps: assembly of an addressable switch head at the top or bottom of the multiple unit piercing assembly. This would add the additional step of isolating and connecting multiple lead pressure barriers into the puck between units during assembly. (6) A puck could be attached to each end of each inner sleeve, yielding two pucks per unit. These pucks could have mating, sealing surfaces between each unit. (7) Pucks could be designed with multi-lead threads to lock the inner sleeves onto the puck without excessive rotation of the components relative to each other. (8) A puck and inner sleeve could be integrated into a single part into a box-by-pin type attachment, further reducing the number of components in a unit. (9) The outer sleeve and one end cap could similarly be made as a single, integral component for box-by-pin style assembly of the outer sleeve/end caps.

The disclosed device is unique when compared with other known devices and solutions because it provides: (1) multiple unit assemblies without the need for threaded connections between them; (2) short unit length; (3) easy orientation of units relative to each other; and (4) a modular design that enables easy adaptation to customers' needs. Similarly, the associated method is unique in that it (1) decreases the length of pressure chamber needed for a given number of units and subsequently the crane height required to insert the tools into the well; (2) creates easier assembly between units because they do not need to be rotated during assembly (no twisted wires or damaged O-rings) and lighter components due to smaller size; and (3) the unit stack can be removed as a set, armed and reinstalled with the outer tube being the only part requiring mechanical attachment of end caps to withstand high tensile loading.

The disclosed device is unique in that it is structurally different from other known devices or solutions. More specifically, the device is unique due to the presence of (1) multiple units that can individually be addressed and initiated at different locations in the well bore while maintaining a very short assembly length; (2) no tensile carrying mechanical connections such as threads are needed between each unit within a multiple unit piercing assembly; and (3) the outer sleeve and end caps are the only component that needs to carry tension along its axis while traversing the well or during initiation of shape charges.

Furthermore, the process associated with the aforementioned device is likewise unique. More specifically, the disclosed process owes its uniqueness to the fact that it (1) multiple units can be removed from the outer tubing assembly and armed as an assembly without fully disassembling each unit; (2) sets of units can be easily shipped without thread protectors fully assembled into a multiple unit piercing assembly because of the minimal effort required to disassemble them for addition of a detonator; and (3) during assembly of more than one multiple unit piercing assembly the different units are easier to handle because of their modular nature and smaller size. This method of handling multiple units in a modular form makes operations in the assembly shop and in the field more efficient.

This disclosure will now provide a more detailed and specific description that will refer to the accompanying drawings. The drawings and specific descriptions of the drawings, as well as any specific or alternative embodiments discussed, are intended to be read in conjunction with the entirety of this disclosure. The Multiple Unit Piercing Assembly may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; rather, these embodiments are provided by way of illustration only and so that this disclosure will be thorough, complete and fully convey understanding to those skilled in the art.

The invention relates generally to tools used to pierce well casing to allow fluids to pass into and out of a wellbore annulus.

In its most complete form, the device is made up of the following components: the outer sleeve includes open ends on both sides. Both sides of the outer sleeve will have features such as threads or engagement holes to allow mechanical attachment of the side A and B end caps to enclose a volume in between. Both end caps will have at least one hole to allow a pressure sealed electrical pass through devices to be inserted. The end caps can have a pressure seal to the inside of the outer sleeve, but in its most ideal form will have a pressure seal between the end cap and an internal puck or the first and last inner sleeve of the unit stack. If the outer sleeve has scallops or holes cut on it, the ID of the outer sleeve may have a feature for orientation of the internal components to the outer sleeve features. This could be as simple as a slot cut through the tube or an internal keyway cut on the inside diameter of the outer sleeve. The puck on one side will be mechanically attached to the charge carrier tube. One way to attach the charge carrier tube to the puck is by a small screw that passes through a hole in the side of the charge carrier tube and threads into a hole on the circumference of the puck.

A shape charge will be inserted into the side of the charge carrier tube with the two components axis' perpendicular with respect to each other. A detonator will be held against the back of the shape charge in a single shape charge configuration. If multiple shape charges are required, a detonation cord will be wrapped around the back of each shape charge with a detonator held against the side or end of the detonation cord. In the simplest form of the multiple unit piercing assembly, an addressable switch will be placed inside of the charge carrier tube. The wiring of the switch will be performed just outside of each unit chamber before the wires are pushed inside the chamber and it is sealed off on either side with a puck. The input and output communication wires from the addressable switch will be connected to the electrical pass through on puck A and puck B respectively. The internal switch would have two leads connected to the detonator wires and the final lead grounded to the puck, carrier tube, or inner sleeve. The explosive assembly includes the shape charge, detonator, detonation cord (if multiple shape charges are used or if necessary), the charge carrier tube, and an addressable switch (if a switch head assembly is not used). This sub assembly will be mechanically attached and aligned with the first puck and the first side of the inner sleeve will be slid over the entire assembly with the puck sealed to the inner sleeve. The other side of the inner sleeve will also have a puck installed sealing off the second side as well. The carrier tube will also be held concentric with the inner sleeves between the pucks but could be offset if needed. The carrier tube could have mechanical timing between puck A and puck B on side A and side B of the unit. Timing between the charge and the outer sleeve could also be accomplished by timing the carrier tube to the puck and the puck to the outer sleeve after fully assembled. A stack of units will be built to the appropriate length before being inserted into the outer sleeve. Puck A and puck B may require unique geometry to seal to either end cap on the outer sleeve. The stack of units will have a puck on either side with one puck between each inner sleeve creating multiple pressure sealed chambers for each unit. In an alternative embodiment, the inner sleeves on each end of the multiple unit stack could seal directly to the end caps. The stack of units will be inserted into the outer sleeve and captured between the end caps on either side of the outer sleeve. Electrical signal wire will have continuity from the outer sleeve end cap through the unit stack to the end cap on the opposite side of the outer sleeve end cap. The multiple unit piercing assembly can then be mechanically and electrically connected to additional multiple unit piercing assemblies or other wire line tools such as plug setting tools, CCL, release tools or a cable head.

FIG. 1 is an expanded isometric view of a single unit of the multi-unit piercing system. The inner sleeve 100 encapsulates piercing and shape charge initiating components in this embodiment, but could house other devices as well. Puck A 101 caps and seals to the inner sleeve 100. Puck A 101 houses an electrical feed through pressure barrier 102 which allows electrical signal(s) to pass through. A pressure barrier retainer 103 holds the electrical feed through pressure barrier 102 inside puck A 101. Electrical terminal A 104 and electrical terminal B 113 and insulated wire A 105 and insulated wire B 112 are used to transmit electrical signals from the electrical feed through pressure barrier 102 to the addressable switch 106, to the detonator 107, through the system, or to another device. Multiple pressure barriers 102 may exist for multiple signal transmission lines through puck A 101. A charge carrier tube 110 is used in this embodiment to position a shape charge 108 within the unit. There may be one or more shape charges 108 within a given unit and the explosive initiation can be initiated by a detonator 107, detonation cord (not shown), or a combination of these and/or other explosive initiating methods. A terminal cap 111 is used in this embodiment to contain and electrically insulate electrical terminal B 113 while holding it in place during assembly. Other means of supporting electrical terminal B 113 may be used. The carrier tube 110 may or may not be attached to puck A 101 using a fastener 109. Rotational locking tabs 115 can be used to rotationally constrain units to each other by means of connecting the carrier tube 110 to puck A 101.

FIG. 2 is an assembled and cross sectioned embodiment of 114. The carrier tube 110 has a retaining tab 200 feature that is used to retain the terminal cap 111 in this embodiment by bending over the retaining tab 200. An access port 202 may be added to the charge carrier tube 110 to allow the connection of the wires 105 and 112, addressable switch 106, detonator 107, and/or other electrical components. Puck A 101 and pressure barrier 102 form a seal surface 201. This seal surface could be eliminated by manufacturing Puck A 101 and inner sleeve 100 as an integrally combined part. The pressure barrier 102 is shown in a generic form; however, an insulated region (outer) and a conductive region (center) are shown. Puck A 101 and inner sleeve 100 have a seal surface 201 in this embodiment. It is noted that another puck (not shown) could be used in conjunction with or in place of the terminal cap 111 on the right side of this drawing.

FIG. 3 is an embodiment of puck B assembly. It includes puck B 300 and an electrical feed through pressure barrier 102 which form a sealed area 301 between these components. The system could be designed to use puck A 101 in place of puck B 300 or electrical contacts and sealing surfaces could be built into the end cap 500 and eliminate the need for puck B entirely. Puck B may also have orienting features built into it similar to those shown on puck A.

FIG. 4 depicts an embodiment of an outer sleeve 400 that is used to encapsulate one or more unit sub-assemblies 204, but not exclusively. Other devices could be encapsulated in a similar fashion including but not limited to logging equipment, sensors, switch packets, plug setting tools, and other related devices. The outer sleeve 400 contains ports 401 which are positioned to be aligned with the shape charge 108 contained within each unit. These ports 401 are depicted as through holes, but could be represented by but not limited to blind holes (scallops), circumferential bands, or be left off of the part entirely (although leaving them off would typically not be desired). Alignment slot A 402 and alignment slot B 403 are used to maintain orientation of the shape charges 108 of each unit 204 to the firing ports 401. The alignment slots could take the form of an internal channel commonly used on conventional piercing assemblies, set screws or could be replaced by other retention methods. Each unit could have an alignment slot or the slots could be done on the ends as depicted here. The ends of the outer sleeve 400 are threaded for connection of an end cap assembly 509 which contains electrical feed through components. Other methods of mechanical retention of the end cap assembly 509 to the outer sleeve 400 could be used.

FIG. 5 is a cross sectioned view of one cylindrical embodiment of a multi-unit piercing assembly fully assembled. The endcaps assemblies 509, and 509′ are mechanically connected to the outer sleeve 400. One embodiment of an end cap assemblies 509 and 509′ for mechanically and electrically connecting assembly segments and/or other down hole equipment is shown. The end cap 509 and 509′ has a threaded feature 501 for mechanically coupling multiple unit piercing assemblies together using the outer sleeve 400 with threads 404. Other means of mechanical coupling could be used, but are not depicted in this embodiment. The outer sleeve 400 and end caps assemblies 509 and 509′ encapsulate three units 204, 204′, and 204″ in this embodiment, but can be expanded to fit as many as desired. The unit sub assembly 204 is sealed at surfaces 506 and 506′ as well as aforementioned seal surfaces 201 creating a pressure sealed chamber. Puck assembly 302 B is connected to the furthest right unit 204″ and sealed on surface 508 and 511. The end cap assembly 509 is mechanically connected 501 to the left side of the outer sleeve 400, which axially constrains the units 204, 204′, and 204″ as well as seals puck A 101 of unit 204 to the end cap 509 at location 505. Similarly end cap 509′ is mechanically connected 516 to the right side of the outer sleeve 400, which axially constrains the units 204, 204′, and 204″ from the opposite end as well as seals the bottom puck assembly 302 to the end cap 509′ at location 511. Puck A 101 may be rotationally constrained with a fastener 500 located in orienting slot 402. Similarly, the puck B assembly 302 may be rotationally constrained to the outer sleeve 400 by use of a fastener 500 located in orienting slot 403. Rotational constraints of units 204′ and 204″ are implemented using locking tabs 115 in locking holes 701. Rotational constraint of central units such as 204′ and 204″ could also be done in the same manner as A 101 by using a fastener to engage additional slots in the outer sleeve like 402 but not depicted in this embodiment. Electrical transmission takes place by electrical contact B 503 contacting the conductive portion of pressure barrier 102 at location 504. Electrical transmission between axially patterned units, for example unit 204 electrically connecting to unit 204′, occurs through contact between electrical terminal B 104 and pressure barrier 102′ at location 507. Electrical transmission from the right unit 204″ to the bottom end plate assembly 302 occurs through contact between electrical terminal B 104′ and pressure barrier 102″ at location 510. Finally, electrical transmission from the bottom end plate assembly 302 to the right end cap 509′ occurs through contact between the conductive part of pressure barrier 102″ and electrical contact A 502 at location 512. The methods for transmitting electrical signals shown here are just one embodiment that could be used. A port on the side of end cap 509 and 509′ could be used to connect wires between piercing assemblies or other tools systems. This method would be more in line with traditional wiring between units currently used between units in the oil and gas industry. Each sub assembly 204, 204′ and 204″ in this embodiment is a self-contained pressure sealed unit with an electrical feed into and out of the assembly. The units 204, 204′ and 204″ individually contain all of the necessary components to initiate a shape charge.

FIG. 6 is an isometric view of puck A 101 with charge tube orienting holes 601 visible. The orienting holes engage with the locking tabs 115 on the charge tube to orient it with the puck connected to the other side of the charge tube. If the outer sleeve incorporates a slot for alignment of each unit, holes 601 are not required for orientation of the middle sub-assemblies.

A single shot selection in the present system may be as short as 20.32 cm (8.0 inches) with 5.08 cm (2.0 inches) added for every additional shot. For example, a dual shot may be 25.4 cm (10.0 inches) and a triple shot may be 30.48 cm (12.0 inches). As a comparison, a conventional perforating gun is at least 25.4 cm (10.0 inches) in length per selection.

Suitably, the diameter of the outer sleeve 400 may be dictated by the well bore dimensions and conditions. A standard gun diameter has a diameter of 7.94 cm (3.125 inches). In one embodiment, the outer sleeve 400 may have a minimum wall thickness of 0.32 cm (0.125 inches) and a maximum wall thickness of 0.95 cm (0.375 inches). The inner sleeve 100 will always have a slight smaller outer diameter (“OD”) (clearance fit) to the ID of the outer sleeve 400. The inner tube for a 3⅛″ gun system may have a maximum outer diameter of 7.3 cm (2.87 inches) with a minimum wall thickness of 0.16 cm (0.0625 inches) and a maximum wall thickness of 0.95 cm (0.375 inches). Wall thickness is dictated by service conditions. In addition, a thin wall inner sleeve 100 may be supported by rings inside the tube used to prevent buckling.

Different features, variations and multiple different embodiments have been shown and described with various details. What has been described in this application at times in terms of specific embodiments is done for illustrative purposes only and without the intent to limit or suggest that what has been conceived is only one particular embodiment or specific embodiments. It is to be understood that this disclosure is not limited to any single specific embodiments or enumerated variations. Many modifications, variations and other embodiments will come to mind of those skilled in the art, and which are intended to be and are in fact covered by this disclosure. It is indeed intended that the scope of this disclosure should be determined by a proper legal interpretation and construction of the disclosure, including equivalents, as understood by those of skill in the art relying upon the complete disclosure present at the time of filing. The embodiment(s) described herein are meant to be illustrative only and should not be taken as limiting the invention, which is defined in the claims.

All original claims submitted with this specification are incorporated by reference in their entirety as if fully set forth herein.

Claims

1. An assembly for piercing a well casing, comprising: an outer sleeve;one or more tube segments sealably housed lengthwise in the outer sleeve, each of the one or more tube segments comprising one or more shape charges; andpuck dividers sealably attached to opposing ends of the one or more tube segments and configured to encapsulate the one or more shape charges;wherein the puck dividers are configured as electrical feed through pressure barriers for each of the one or more tube segments.

2. The assembly of claim 1 wherein each of the one or more tube segments comprises an explosive initiation system.

3. The assembly of claim 2 wherein the explosive initiation system includes a detonator and an electrical switch.

4. The assembly of claim 1 further including end cap assemblies releasably attachable to opposing ends of the outer sleeve, each of the end cap assemblies comprising electrical feed through components.

5. The assembly of claim 1 wherein each of the puck dividers is configured to house an electrical feed through pressure barrier configured to allow electrical signal(s) to pass through the each of the puck dividers.

6. The assembly of claim 1 further comprising pressure barrier retainers configured to hold each electrical feed through pressure barrier inside a corresponding puck divider.

7. The assembly of claim 1 wherein the outer sleeve comprises one or more through ports aligned with the one or more shape charges.

8. The assembly of claim 3 wherein the explosive initiation system further includes a detonation cord.

9. An assembly for piercing a well casing, comprising: an outer sleeve assembly;one or more inner sleeves for holding one or more explosive assemblies; anddivider pucks releasably attached to opposing ends of the one or more inner sleeves;wherein the outer sleeve assembly includes an outer sleeve comprising one or more through ports and an endcap assembly releasably attachable to each end of the outer sleeve;wherein the one or more inner sleeves are configured to align the one or more explosive assemblies relative to one or more other explosive assemblies; andwherein the divider pucks are configured as electrical feed through pressure barriers for the one or more one or more inner sleeves.

10. The assembly of claim 9 wherein each explosive assembly of the one or more explosive assemblies includes one or more shape charges and an explosive initiation system.

11. The assembly of claim 10 wherein the explosive initiation system includes a detonator and an electrical switch.

12. The assembly of claim 10 wherein the one or more shape charges may be oriented in a predetermined angle relative to other shape charges or other components in the system.

13. The assembly of claim 9 wherein the divider pucks are non-threadedly attached to opposing ends of the one or more inner sleeves.

14. The assembly of claim 9 wherein the outer sleeve assembly includes an outer sleeve comprising one or more through ports.

15. A method, comprising: installing into a well bore a device configured to pierce a well casing of the well bore, the device comprising: an outer sleeve;one or more tube segments sealably housed lengthwise in the outer sleeve, each of the one or more tube segments comprising one or more shape charges; andpuck dividers sealably attached to opposing ends of the one or more tube segments and configured to encapsulate the one or more shape charges;wherein the puck dividers are configured as electrical feed through pressure barriers for each of the one or more tube segments.