High-efficiency butt joint tool for offshore electric submersible pump through packer cable

Abstract

The application discloses a kind of offshore submerged oil electric pump over packer cable high-efficiency docking tools, including assembly frame, limiting mechanism and cutting mechanism, limiting mechanism is located on assembly frame, limiting mechanism is used to position cable copper core, cutting mechanism includes cutting support base, first tooth cutter, second tooth cutter and first power component, cutting support base is located on the bottom of assembly frame, cutting support base is used to support cable copper core, first tooth cutter is located on the side of cutting support base, second tooth cutter is located above first tooth cutter, first power component is used to drive second tooth cutter vertical movement, second tooth cutter and first tooth cutter cooperate and cut cable copper core into sawtooth shape.This application makes copper core cutting shaping into sawtooth shape, two sections of copper core after cutting are engaged with each other, can play the role of tensile and compressive working condition, ensure the continuity of cable, greatly reduce local electric field distortion effect, and then extend pump inspection cycle, improve oilfield annual recovery rate.

Description

Technical Field

[0001] This invention relates to the field of artificial lift technology for offshore oilfield development, and in particular to a high-efficiency tool for connecting cables of offshore submersible electric pumps over packers. Background Technology

[0002] When offshore fixed oil and gas production platforms are engaged in bottom-hole crude oil extraction, in order to meet the process requirements of the submersible electric pump (ESP) packer string, the ESP cable must be cut, passed through the packer, and then reconnected. Existing ESP cable connection methods are relatively rudimentary and prone to phase-to-phase short circuits or insulation breakdown, mainly manifested in the following aspects: 1) Local electric field distortion, resulting in decreased insulation performance. Existing spiral cable splicing methods can easily cause the geometry of the cable joint to be discontinuous with the original cable, resulting in uneven electric field distribution. This is especially true in medium and high voltage cables, where electric field concentration can easily occur, potentially leading to partial discharge. Over long-term operation, this can accelerate the aging of the insulation and reduce its insulation performance.

[0003] 2) Increased contact resistance leads to increased heat generation. If conductor connections (such as twisted butt joints) do not achieve ideal metallurgical bonding, additional contact resistance will be introduced. This can easily lead to localized overheating, increasing the risk of heat accumulation. Especially under high current conditions, the heat generation can rise sharply, easily causing a fire in nearby flammable materials.

[0004] 3) Reduced mechanical strength and decreased cable sealing performance The existing copper core winding method for cables typically results in lower tensile strength and bending performance in the joint area compared to the original cable body, making it prone to becoming a weak point under vibration, tension, or thermal expansion and contraction cycles. Furthermore, in dynamic load environments such as offshore platforms, this can lead to fatigue fracture of the cable insulation sheath and armor, ultimately causing moisture intrusion or salt spray corrosion, which in turn leads to electrochemical corrosion or insulation deterioration. Over time, this can easily result in cable insulation breakdown, shortening the pump inspection cycle. Summary of the Invention

[0005] In order to solve all or part of the above problems, the present invention aims to provide an efficient tool for connecting cables of marine submersible electric pumps over packers.

[0006] The present invention solves its problems through the following technical solution: A high-efficiency cable splicing tool for offshore submersible oil pumps via packers includes an assembly frame, a limiting mechanism, and a cutting mechanism. The limiting mechanism is located on the assembly frame and is used to position the copper core of the cable. The cutting mechanism includes a cutting support base, a first toothed cutter, a second toothed cutter, and a first power assembly. The cutting support base is located at the bottom of the assembly frame and is used to support the copper core of the cable. The first toothed cutter is located on the side of the cutting support base, and the second toothed cutter is located above the first toothed cutter. The first power assembly is used to drive the second toothed cutter to move vertically. The second toothed cutter and the first toothed cutter cooperate to cut the copper core of the cable into a serrated shape.

[0007] Optionally, the first power assembly includes a first hydraulic cylinder and a first connecting member. The hydraulic push rod of the first hydraulic cylinder is connected to the first connecting member, and the first connecting member has a second toothed cutter on the side corresponding to the first toothed cutter.

[0008] Optionally, the second toothed cutter is detachably connected to the first connector.

[0009] Optionally, the first connector is further provided with a cutting blade, which is used to cut the copper core of the cable.

[0010] Optionally, the first toothed cutter is detachably connected to the cutting support base.

[0011] Optionally, the limiting mechanism includes a copper core engagement plate, a second connecting member, and a second hydraulic cylinder. The copper core engagement plate is located inside the cutting mechanism. The hydraulic push rod of the second hydraulic cylinder is connected to the second connecting member, and the second connecting member is connected to the copper core engagement plate. The second hydraulic cylinder is used to drive the copper core engagement plate to move horizontally to clamp the copper core of the cable.

[0012] Optionally, the limiting mechanism includes a cable armor outer layer limiting pressure plate support and a cable armor outer layer limiting cover plate. The cable armor outer layer limiting pressure plate support is disposed on the assembly frame and located outside the cutting mechanism. The cable armor outer layer limiting cover plate cooperates with the cable armor outer layer limiting pressure plate support to limit the radial and axial displacement of the cable copper core.

[0013] Optionally, the cable armor outer layer limiting pressure plate support includes an arc-shaped rack limiting support and a long rack, wherein the long rack is connected between two arc-shaped rack limiting supports.

[0014] Optionally, the long rack is provided with a plurality of straight teeth, which are perpendicular to the axial direction of the copper core of the cable.

[0015] Optionally, it also includes a copper core limiting baffle. There are two sets of cutting mechanisms and limiting mechanisms. The two sets of cutting mechanisms and limiting mechanisms are symmetrically arranged with respect to the copper core limiting baffle. The copper core limiting baffle is detachably connected to the assembly frame.

[0016] In summary, the technical effects and advantages of this invention are as follows: This application enables the copper core to be cut and shaped into a sawtooth shape, and the two cut copper core sections mesh with each other, which can play a role in tensile and compressive resistance, ensuring the continuity and integrity of the cable, greatly reducing the local electric field distortion effect, thereby extending the pump inspection cycle and improving the annual oilfield recovery rate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a high-efficiency cable splicing tool for offshore submersible oil pumps via packer, according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a high-efficiency cable splicing tool for offshore submersible oil pumps via packer, according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a high-efficiency cable splicing tool for offshore submersible oil pumps via packer, according to an embodiment of the present invention. Figure 3 ; Figure 4 This is a schematic diagram of the limiting mechanism and the cutting mechanism in one embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure for mounting the cable copper core in the limiting mechanism and cutting mechanism according to one embodiment of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the structure for mounting the cable copper core in the limiting mechanism and cutting mechanism according to one embodiment of the present invention. Figure 2 ; Figure 7 This is an exploded view of the limiting mechanism and the cutting mechanism in one embodiment of the present invention. Figure 1 ; Figure 8 This is an exploded view of the limiting mechanism and the cutting mechanism in one embodiment of the present invention. Figure 2 ; Figure 9 This is a demolding diagram of a high-efficiency docking tool for a packer cable of a marine submersible oil pump according to an embodiment of the present invention.

[0019] The components include: 1. Assembly frame; 2. Cable copper core; 3. Cutting support base; 4. First toothed cutter; 5. Second toothed cutter; 6. First hydraulic cylinder; 7. First connector; 8. Cutting blade; 9. Copper core meshing pressure plate; 10. Second connector; 11. Second hydraulic cylinder; 12. Cable armor outer layer limiting cover; 13. Arc-shaped rack limiting support; 14. Long rack; 15. Copper core limiting baffle. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This embodiment proposes a high-efficiency cable splicing tool for offshore submersible oil pumps via packer, such as... Figures 1-9 As shown, the assembly includes an assembly frame 1, a limiting mechanism, and a cutting mechanism. The limiting mechanism is located on the assembly frame 1 and is used to position the cable copper core 2. The cutting mechanism includes a cutting support base 3, a first toothed cutter 4, a second toothed cutter 5, and a first power assembly. The cutting support base 3 is located at the bottom of the assembly frame 1 and is used to support the cable copper core 2 to cooperate with the second toothed cutter 5 in cutting and shaping the cable copper core 2. The first toothed cutter 4 is located on the side of the cutting support base 3, and the second toothed cutter 5 is located above the first toothed cutter 4. The first power assembly is used to drive the second toothed cutter 5 to move vertically. The second toothed cutter 5 and the first toothed cutter 4 cooperate to cut the cable copper core 2 into a serrated shape.

[0022] In this embodiment, the copper core is cut and shaped into a sawtooth shape by the second toothed cutter 5. The two cut copper core segments mesh with each other, which can resist tensile and compressive conditions and ensure the continuity and integrity of the cable.

[0023] Specifically, the first power assembly includes a first hydraulic cylinder 6 and a first connecting member 7. The hydraulic push rod of the first hydraulic cylinder 6 is connected to the first connecting member 7, and the first connecting member 7 has a second toothed cutter 5 on its side corresponding to the first toothed cutter 4. The first hydraulic cylinder 6 can drive the first connecting member 7 and the second toothed cutter 5 to move vertically.

[0024] Optionally, the second toothed cutter 5 is detachably connected to the first connector 7. In this embodiment, the second toothed cutter 5 and the first connector 7 are connected by bolts and nuts; the second toothed cutter 5 can be replaced if damaged when cutting the shaped cable.

[0025] Furthermore, the first connector 7 is also provided with a cutting blade 8, which is used to cut the copper core 2 of the cable. The cutting blade 8 is connected to the first connector 7 by a stud, which facilitates the replacement of the cutting blade 8 in real time.

[0026] Optionally, the first toothed cutter 4 is detachably connected to the cutting support base 3. In this embodiment, the first toothed cutter 4 and the cutting support base 3 are connected by bolts and nuts; the second toothed cutter 5 assists in cutting the cable, and the first toothed cutter 4 can be replaced if damaged.

[0027] Specifically, the limiting mechanism includes a copper core engaging pressure plate 9, a second connecting member 10, and a second hydraulic cylinder 11. The copper core engaging pressure plate 9 is located inside the cutting mechanism. The hydraulic push rod of the second hydraulic cylinder 11 is connected to the second connecting member 10, and the second connecting member 10 is connected to the copper core engaging pressure plate 9. The second hydraulic cylinder 11 is used to drive the copper core engaging pressure plate 9 to move horizontally to clamp the cable copper core 2. The second hydraulic cylinder 11 drives the copper core engaging pressure plate 9 to generate radial displacement in the cable copper core 2, thereby clamping the cable copper core 2.

[0028] Specifically, the limiting mechanism includes a cable armor outer layer limiting pressure plate support and a cable armor outer layer limiting cover plate 12. The cable armor outer layer limiting pressure plate support is located on the assembly frame 1 and outside the cutting mechanism. The cable armor outer layer limiting cover plate 12 cooperates with the cable armor outer layer limiting pressure plate support to limit the radial and axial displacement of the cable copper core 2.

[0029] Furthermore, the cable armor outer layer limiting pressure plate support includes an arc-shaped rack limiting support 13 and a long rack 14, the long rack 14 being connected between two arc-shaped rack limiting supports 13. Optionally, the long rack 14 is provided with multiple straight teeth, the straight teeth being perpendicular to the axial direction of the cable copper core 2.

[0030] Specifically, it also includes a copper core limiting baffle 15. There are two sets of cutting mechanisms and limiting mechanisms, symmetrically arranged relative to the copper core limiting baffle 15. The copper core limiting baffle 15 is detachably connected to the assembly frame 1. In this embodiment, the copper core limiting baffle 15 and the assembly frame 1 are plugged in.

[0031] The working process of this embodiment is as follows: First, the outer anti-pull and explosion-proof armor and the outer insulation layer of the copper core of the cut cable are peeled off. At the same time, the exposed copper core is compared in size to ensure that the two sections of copper core are of the same length and conform to the shaping state of the equipment. Second, the copper core limiting baffle 15 is vertically inserted into the center of the assembly frame 1, and the two sections of copper core to be shaped are placed horizontally on the cutting support base 3 until they touch the copper core limiting baffle 15. The cable armor outer limiting cover 12 is pressed and locked. Third, the second hydraulic cylinder 11 is pressurized so that the cylinder push rod extends and hugs the copper core to prevent axial or radial displacement of the copper core end. Fourth, the first hydraulic cylinder 6 is pressurized so that the hydraulic push rod moves vertically downward, and the second toothed cutter 5 cooperates with the first toothed cutter 4. The process involves: 1) Cutting the copper core vertically downwards, and then cutting and shaping the ends of the copper core with the cutting blade 8; 2) Reverse pressing the first hydraulic cylinder 6, causing the second toothed cutter 5 to reset and disengage from the copper core position; 3) Removing the upper cover of the assembly frame 1, removing the copper core limiting baffle 15, loosening the outer limiting cover 12 of the cable armor, and pushing the shaped copper core into the center of the assembly frame 1; 4) Under the mutual pushing action of the second hydraulic cylinder 11 on one side, making the shaped copper cores mesh with each other; 5) In the copper welding demolding channel, copper welding is performed to fill the gaps between the two sets of copper cores after meshing, and after cooling, it can be separated from the device; 6) After cooling, the outer limiting cover 12 of the cable armor is removed and the copper-welded cable is taken out. After visual inspection to ensure there are no obvious gaps or breaks, the outer insulation layer and protective armor of the cable copper core 2 are manually restored.

[0032] In summary, this embodiment enables the copper core to be cut and shaped into a serrated shape, and the two cut copper core sections mesh with each other, which can provide tensile and compressive resistance, ensure the continuity and integrity of the cable, greatly reduce the local electric field distortion effect, thereby extending the pump inspection cycle and improving the annual oilfield recovery rate.

[0033] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency cable splicing tool for offshore submersible oil pumps via packer, characterized in that: The device includes an assembly frame, a limiting mechanism, and a cutting mechanism. The limiting mechanism is located on the assembly frame and is used to position the copper core of the cable. The cutting mechanism includes a cutting support base, a first toothed cutter, a second toothed cutter, and a first power assembly. The cutting support base is located at the bottom of the assembly frame and is used to support the copper core of the cable. The first toothed cutter is located on the side of the cutting support base, and the second toothed cutter is located above the first toothed cutter. The first power assembly is used to drive the second toothed cutter to move vertically. The second toothed cutter and the first toothed cutter cooperate to cut the copper core of the cable into a serrated shape.

2. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 1, characterized in that, The first power assembly includes a first hydraulic cylinder and a first connecting member. The hydraulic push rod of the first hydraulic cylinder is connected to the first connecting member, and the first connecting member has a second toothed cutter on the side corresponding to the first toothed cutter.

3. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 2, characterized in that, The second toothed cutter is detachably connected to the first connector.

4. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 2, characterized in that, The first connector is also provided with a cutting blade, which is used to cut the copper core of the cable.

5. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 1, characterized in that, The first toothed cutter is detachably connected to the cutting support base.

6. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 1, characterized in that, The limiting mechanism includes a copper core engagement plate, a second connecting member, and a second hydraulic cylinder. The copper core engagement plate is located inside the cutting mechanism. The hydraulic push rod of the second hydraulic cylinder is connected to the second connecting member, and the second connecting member is connected to the copper core engagement plate. The second hydraulic cylinder is used to drive the copper core engagement plate to move horizontally to clamp the copper core of the cable.

7. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 1, characterized in that, The limiting mechanism includes a cable armor outer layer limiting pressure plate support and a cable armor outer layer limiting cover plate. The cable armor outer layer limiting pressure plate support is located on the assembly frame and outside the cutting mechanism. The cable armor outer layer limiting cover plate cooperates with the cable armor outer layer limiting pressure plate support to limit the radial and axial displacement of the cable copper core.

8. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 7, characterized in that, The cable armor outer layer limiting pressure plate support includes an arc-shaped rack limiting support and a long rack, wherein the long rack is connected between two arc-shaped rack limiting supports.

9. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 8, characterized in that, The long rack has multiple straight teeth, which are perpendicular to the axial direction of the copper core of the cable.

10. The high-efficiency cable splicing tool for offshore submersible oil pumps over packer as described in claim 1, characterized in that, It also includes a copper core limiting baffle. There are two sets of cutting mechanisms and limiting mechanisms. The two sets of cutting mechanisms and limiting mechanisms are symmetrically arranged with respect to the copper core limiting baffle. The copper core limiting baffle is detachably connected to the assembly frame.

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