Three-section type right-angle plug-in wellhead cable penetrating device and installation and maintenance method

Abstract

The invention discloses a three-section type right-angle plug-in wellhead cable penetrating device, which comprises a penetrating device female head body, a penetrating device male head body and a ground plug, and is characterized in that the penetrating device female head body is arranged in a vertical penetrating hole of a tubing hanger; one end of the traversing device male head body is sequentially inserted into an oil pipe four-way transverse through hole of the oil pipe four-way body and a transverse through hole of the oil pipe hanger from the outer side, and the transverse through hole of the oil pipe hanger is communicated with a vertical through hole of the oil pipe hanger. The first right-angle connecting copper sleeve is used for achieving right-angle plugging cable wellhead crossing, and the two ends of the crossing device male head body are in butt joint with the crossing device female head body and the ground plug respectively. Installation and maintenance are easy and convenient, rapid maintenance and replacement of the cable penetrating device are carried out without dismounting a Christmas tree, time and labor are saved, and safety and reliability are achieved. The well control risk problem that a main valve of a Christmas tree cannot be closed due to the fact that a composite cable is hung in an oil pipe for a long time and can only penetrate through the top in the composite cable electric pump throwing and pulling process can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum cable crossing, in particular to a three-section right-angle plug-in wellhead cable crossing device and an installation and maintenance method. Background Art

[0002] Conventional submersible electric pump production and completion technology requires the unit to be connected to the lower end of the oil pipe, and the submersible cable to be connected to the motor, which is fixed to the outer wall of the oil pipe through the cable cover. The unit and cable are gradually transported to the well using the oil pipe, and the cable passes through the oil pipe hanger and the wellhead device, and finally connected to the ground junction box. Therefore, in order to ensure that the submersible cable passes through the wellhead device smoothly and is sealed and isolated, a special wellhead cable crossing device is required.

[0003] Conventional wellhead cable crossing devices adopt a two-stage structure, consisting of a crossing device body and a ground plug. For example, the utility model patent for a combined wellhead cable crossing device with application number 202320125197.6 and the utility model patent for a wellhead cable crossing device with an inclined cable hole with application number CN202120362327.9 both introduce cable crossing devices of typical two-stage structure, whose main body passes through the tubing hanger and upper flange of the wellhead device, is built into the wellhead device, and the tail end is connected to the downhole cable; one end of the ground plug is plugged into the crossing device body outside the wellhead device, and the other end is connected to the ground cable, and finally connected to the junction box. However, conventional cable crossing devices need to pass through the tubing hanger and the upper flange during installation, so the entire part above the upper flange of the wellhead device needs to be removed during installation and maintenance, especially when the upper flange is loaded and unloaded, it is easy to cause damage to the crossing device, the operation is time-consuming and labor-intensive, and when the crossing device body fails, it cannot be maintained in time, and the entire upper flange part must be removed, which is cumbersome. Therefore, it is necessary to further improve and optimize the wellhead cable crosser structure to achieve the installation, maintenance and replacement of the cable crosser without dismantling the Christmas tree.

[0004] At the same time, the composite cable fishing electric submersible pump process is increasingly widely used in offshore and onshore oil fields due to its advantages such as simple process, flexible application and convenient operation. For example, the invention patent of fishing cable submersible screw pump with application number CN201721058908.3 and the utility model patent of a cable fishing electric pump system with application number 202110305066.1 introduce the process of directly fishing electric pump units or wet joints with steel wire armored cables in large-size oil pipes. The operation is convenient and fast, and can effectively avoid cable bumps and squeezing. The above two composite cable fishing processes require the composite cable to be suspended in the large-size oil pipe for a long time, especially at the wellhead position. Conventional cable crossing devices can only suspend the composite cable from the top of the oil tree to the ground, which causes the steel wire cable to pass through the main diameter of the entire wellhead device, resulting in the inability to close the main valve of the oil tree in an emergency, which has a greater well control risk. Therefore, it is necessary to improve the cable crossing structure and position so that it does not affect the main valve switch function and meet the well control safety requirements. Summary of the invention

[0005] The present invention provides a three-section right-angle plug-in wellhead cable penetration device and an installation and maintenance method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A three-section right-angle plug-in wellhead cable crossing device, comprising a crossing device female head body, a crossing device male head body and a ground plug, wherein the crossing device female head body is arranged in a vertical crossing hole of a tubing hanger, one end of the crossing device male head body is inserted into the tubing four-way transverse crossing hole of a tubing four-way body and the transverse crossing hole of a tubing hanger from the outside in sequence, the transverse crossing hole of the tubing hanger is connected with its vertical crossing hole, a first right-angle connecting copper sleeve is arranged in the crossing device female head body, the first right-angle connecting copper sleeve is used to realize the right-angle plug-in cable wellhead crossing, and the two ends of the crossing device male head body are respectively connected with the crossing device female head body and the ground plug.

[0008] Optionally, a power cable is provided at the lower end of the female body of the penetration device, and the power cable is connected to the downhole submersible motor. The upper end of the female body of the penetration device is provided with the first right-angle connecting copper sleeve, and the first right-angle connecting copper sleeve is provided with a plurality of L-shaped inner holes. The power cable is stripped of the cable copper core and pre-inserted into the inner hole, and the lateral part of the inner hole is used to dock with the male body of the penetration device.

[0009] Optionally, the gap inside the female connector body of the through-device is filled with a first insulating rubber.

[0010] Optionally, a positioning step is provided on the outer circumference of the female head body of the piercer, and a locking sleeve is provided below the positioning step.

[0011] Optionally, a first O-ring is provided above the positioning step.

[0012] Optionally, an inner plug and an outer plug are respectively provided at the inner and outer ends of the male connector body of the penetration device, a conductive copper rod is provided between the inner and outer plugs, an inner pin and an outer pin are respectively provided at the inner and outer ends of the conductive copper rod, the inner pin and the outer pin extend out of the inner plug and the outer plug respectively, the inner pin is docked with the transverse inner hole of the first right-angle connecting copper sleeve, and the outer pin is used to dock with the ground plug.

[0013] Optionally, the gap between the inner plug and the conductive copper rod is filled with a second insulating rubber, and the gap between the outer plug and the conductive copper rod is filled with a third insulating rubber.

[0014] Optionally, a fourth O-ring is provided between the outer periphery of the external plug and the inner hole of the male body of the penetrater, a step surface is provided on the outer periphery of the external plug extending out of the inner hole of the male body of the penetrater, and the external plug is locked and fastened with the outer thread of the male body of the penetrater by a fastening nut.

[0015] Optionally, a ground cable is provided at one end of the ground plug, and the ground cable is used to connect to a ground junction box; a second connecting copper sleeve is provided at the other end of the ground plug, and the ground cable is stripped of its copper core and pre-inserted into the inner hole of the second connecting copper sleeve, and the inner hole of the second connecting copper sleeve is connected to the external plug pin.

[0016] A method for installing and maintaining the aforementioned three-section right-angle plug-in wellhead cable pass-through device comprises the following steps:

[0017] Step a: After the casing is lowered during the completion operation, the tubing spool body is installed and tightened;

[0018] Step b: inserting the female body of the wellhead penetration device into the vertical penetration hole of the tubing hanger;

[0019] Step c: Install the tubing hanger, paying attention to the orientation of the tubing hanger to ensure that the transverse through hole of the tubing hanger and the transverse through hole of the tubing spool are aligned;

[0020] Step d: Insert the inner pin of the male connector of the through-hole into the inner hole of the first right-angle connecting copper sleeve;

[0021] Step e: Install the ground plug and finally connect the ground cable to the wellhead junction box;

[0022] Step f: If the submersible pump cable fails, just remove the ground plug and the male body of the crosser for electrical testing. If the ground plug and the male body of the cable crosser fail, they can be replaced directly without removing the Christmas tree. If the female body of the crosser and the downhole power cable fail, it is necessary to re-lift the tubing hanger and reinstall the cable crosser.

[0023] In summary, the technical effects and advantages of the present invention are as follows: the present application adopts a three-stage right-angle plug-in cable crossing structure, and the key parts of the crossing device can be crossed through an external right-angle plug-in, which can not only solve the cumbersome installation and maintenance problems of conventional cable crossing devices, but also realize the rapid maintenance and replacement of the crossing device without dismantling the oil tree, saving time and effort, and being safe and reliable. At the same time, another aspect of the present invention solves the well control risk problem of the main valve of the oil tree being unable to be closed due to the long-term suspension of the composite cable inside the oil pipe and the inability to cross only at the top in the composite cable casting and salvaging electric pump process through a right-angle plug-in crossing structure. The structure is simple, the operation is convenient, and the overall safety and reliability. The operation process of a three-stage right-angle plug-in wellhead cable crossing device is simpler than previous operations. The installation of the cable crossing device is not related to the installation of the flange on the oil tree. The crossing device can be disassembled and installed, and maintained and replaced without disassembling the oil tree. The operation is flexible and convenient, saving time and effort. At the same time, for the composite cable casting and fishing electric submersible pump process, the cable crosser can be used to make the composite cable in the oil pipe pass through any position in the middle to the outside of the wellhead device, without passing through the top of the wellhead device, and does not affect the main valve switching function above the upper flange. It meets the well control requirements and ensures the safety and reliability of the wellhead device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 The structure diagram of the three-section right-angle plug-in wellhead cable penetration device in one embodiment of the present invention; wherein the AA view is a right view of the penetration device female head body, the BB view is a partial cross-sectional view of the penetration device female head body, and the CC view is a left view of the ground plug;

[0026] Figure 2 It is an assembly schematic diagram of a three-section right-angle plug-in wellhead cable passer installed on a wellhead device in an embodiment of the present invention.

[0027] Among them: 1. Power cable; 2. Female body of the through-device; 3. Locking sleeve; 4. Positioning step; 5. First O-ring; 6. First insulating rubber; 7. First right-angle connecting copper sleeve; 8. Cable copper core; 9. Inner pin; 10. Second O-ring; 11. Inner plug; 12. Second insulating rubber; 13. Third O-ring; 14. Positioning step; 15. Male body of the through-device; 16. Conductive copper rod; 17. Fourth O-ring; 18. External plug; 19. Fastening nut; 20, third insulating rubber; 21, external pin; 22, locking cap; 23, ground plug; 24, ground cable; 25, fourth insulating rubber; 26, second connecting copper sleeve; 27, Christmas tree upper flange; 28, oil pipe hanger; 29, first O-ring of oil pipe hanger; 30, horizontal through hole; 31, second O-ring of oil pipe hanger; 32, vertical through hole; 33, oil pipe spool body; 34, oil pipe spool horizontal through hole; 35, oil pipe; 36, casing. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] This embodiment provides a three-section right-angle plug-in wellhead cable pass-through device, such as Figure 1 As shown, it shows a schematic diagram of the structure of a three-section right-angle plug-in wellhead cable crossing device according to an embodiment of the present invention, which mainly includes three parts: a crossing device female body 2, a crossing device male body 15 and a ground plug 23. Figure 2 As shown, it shows a schematic diagram of the assembly of a three-section right-angle plug-in wellhead cable passer in a wellhead device according to an embodiment of the present invention.

[0031] Specifically, one end of the female body 2 of the through-device is a submersible electric pump power cable 1, which is connected to the submersible motor downhole; at the other end, the power cable needs to be stripped of three cable copper cores 8 and pre-inserted into the inner holes of three first right-angle connecting copper sleeves 7. The inner hole at the other end of the first right-angle connecting copper sleeve 7 can meet the insertion of the inner pin 9 of the male body 15 of the through-device to achieve the conductive conduction function. In order to ensure sealing, insulation and certain strength requirements, the gap in the female body 2 of the through-device is filled with the first insulating rubber 6 through a vulcanization molding process. A positioning step 4 is provided on the outer periphery of the female body 2 of the through-device, and a locking sleeve 3 is provided below the positioning step 4. A first O-ring 5 is provided above the positioning step 4.

[0032] Secondly, the male body 15 of the cable traverser is the middle part of the cable traverser and has a double pin structure, which is used to connect the female body 2 of the traverser and the ground plug 22. It is mainly composed of an inner plug 11, a conductive copper rod 16 and an outer plug 18. One end of the conductive copper rod 16 is prefabricated as an inner pin 9, and the other end is prefabricated as an outer pin 21. The gap between the inner plug 11 and the conductive copper rod 16 is filled with a second insulating rubber 12 through a vulcanization molding process to ensure sealing, insulation and certain strength requirements. The gap between the outer plug 18 and the conductive copper rod 16 is also filled with a third insulating rubber 20 through a vulcanization molding process to ensure sealing, insulation and certain strength requirements. The outer circle of the outer plug 18 is equipped with a fourth O-ring 17 that cooperates with the inner hole of the male body 15 of the traverser to ensure the sealing of the inner cavity. The outer circle of the outer plug 18 has a step surface, which is locked and fastened by a fastening nut 19 and the outer thread of the traversing seal body 15.

[0033] Again, the ground plug 23 is a conventional ground straight plug structure, with a ground cable 24 at one end, connected to the ground junction box; at the other end, the cable needs to be stripped of three cable copper cores and pre-inserted into the inner holes of three second connection copper sleeves 26. The inner hole at the other end of the second connection copper sleeve 26 can meet the insertion of the outer pin 21 of the male body 15 of the traverser to achieve the conductive function. In order to ensure sealing, insulation and certain strength requirements, the gap in the ground plug 23 is filled with a fourth insulating rubber 25 through a vulcanization molding process. The locking cap 22 is tightened with the male thread on the end face of the external plug 18 to ensure reliable and firm plugging.

[0034] Finally, the core of the crossing device lies in the use of the first right-angle connecting copper sleeve 7 to realize the right-angle plug-in cable wellhead crossing, especially the double-pin structure of the middle part of the crossing device male head body 15 and the innovative design of the jack structure at both ends, which can realize the rapid plug-in and pull-out, rapid maintenance and replacement of the cable crossing device.

[0035] In a specific embodiment, the specific operation process of the cable crossing device is as follows:

[0036] Step a: After the casing 36 is lowered in the completion operation, the tubing spool body 33 is installed and tightened, the submersible electric pump unit and the tubing 35 are lowered into the casing 36 in sequence, the power cable 1 is fixed to the outer wall of the tubing 35, and the tubing 35 is lowered into the well at the same time until the last tubing is connected to the tubing hanger 28;

[0037] Step b: At this time, the power cable 1 at the lower end of the wellhead penetrator female body 2 is connected to the downhole submersible motor, the wellhead penetrator female body 2 is inserted into the vertical penetration hole 32 of the tubing hanger 28, the positioning step 4 can determine the insertion depth of the wellhead penetrator female body 2, and finally the locking sleeve 3 is fastened with the internal thread of the vertical penetration hole 32, and the transverse penetration hole 30 of the tubing hanger 28 is pre-blocked with a detachable plug to prevent the well fluid from entering during the hanging process;

[0038] Step c: Install the tubing hanger 28 and the Christmas tree flange 27, lower the tubing hanger 28 into the tubing spool body 33, pay attention to the position of the tubing hanger 28 to ensure that the transverse through hole 34 of the tubing hanger 28 and the transverse through hole 34 of the tubing spool are aligned, tighten the top screw to tighten the tubing hanger 28, whether the Christmas tree flange 27 is installed at this time does not affect the operation of the cable pass-through device;

[0039] Step d: Remove the prefabricated plug of the transverse through hole 30 from the transverse through hole 34 of the oil pipe spool, and sequentially pass the male plug body 15 of the through-hole through the transverse through hole 34 and the vertical through hole 32 of the oil pipe spool, and finally insert the inner pin 9 into the inner hole of the first right-angle connection copper sleeve 7 to achieve copper conductor docking. The limiting step 14 determines the insertion depth, and is fastened by the external pressure cap;

[0040] Step e: Install the ground plug 23, insert the outer pin 21 into the second connecting copper sleeve 26, and lock the locking cap 22 with the male thread of the outer plug 18, and finally connect the ground cable 24 to the wellhead junction box;

[0041] Step f: If the submersible pump cable fails, there is no need to dismantle the Christmas tree for further testing. Just remove the ground plug 23 and the male body 15 of the crosser for electrical testing. If the ground plug 23 and the male body 15 of the cable crosser fail, they can be replaced directly. If the female body 2 of the crosser and the downhole power cable 1 fail, the oil pipe hanger needs to be re-lifted.

[0042] In this embodiment, in order to ensure that the insertion process of the cable crosser is completely sealed and isolates the well fluid, the cable crosser has a multi-layer sealing and insulation structure design. First, the first O-ring 29 of the tubing hanger, the second O-ring 31 of the tubing hanger and the first O-ring 5 as a whole serve as the first sealing barrier to ensure that the well fluid does not enter the crossing hole; secondly, the second O-ring 10 and the third O-ring 13 as a whole serve as the second sealing barrier to further isolate the crossing hole; finally, the fourth O-ring 16 ensures that the inner cavity of the crosser is sealed and isolated from the external environment.

[0043] Furthermore, in this embodiment, the first insulating rubber 6, the second insulating rubber 12, the third insulating rubber 20 and the fourth insulating rubber 25 ensure the insulation of the cable copper core and the conductive copper rod, and play a sealing and pressure-resistant role.

[0044] The operation process of the three-stage right-angle plug-in wellhead cable crossing device in the embodiment of the present invention is simpler than the previous operation. The installation of the cable crossing device is not related to the installation of the flange on the oil tree. The crossing device can be disassembled and installed without disassembling the oil tree, and the maintenance and replacement are flexible and convenient, saving time and effort. At the same time, for the composite cable casting and fishing electric submersible pump process, the cable crossing device described in this article can make the composite cable in the oil pipe pass to the outside of the wellhead device in time at any position in the middle, without passing through the top of the wellhead device, without affecting the main valve switch function above the upper flange, meeting the well control requirements, and ensuring the safety and reliability of the wellhead device.

[0045] In summary, this embodiment adopts a three-stage right-angle plug-in cable crossing structure. The key parts of the crossing device can be crossed through external right-angle plug-in. It can not only solve the cumbersome installation and maintenance problems of conventional cable crossing devices, but also realize the rapid maintenance and replacement of the crossing device without dismantling the oil tree, which saves time and effort, and is safe and reliable. At the same time, another aspect of the present invention solves the well control risk problem of the main valve of the oil tree being unable to be closed due to the long-term suspension of the composite cable inside the oil pipe and the inability to cross only at the top in the composite cable casting and salvaging electric pump process through the right-angle plug-in crossing structure. The structure is simple, the operation is convenient, and the overall safety and reliability. The operation process of a three-stage right-angle plug-in wellhead cable crossing device is simpler than previous operations. The installation of the cable crossing device is not related to the installation of the flange on the oil tree. The crossing device can be disassembled and installed, and maintained and replaced without disassembling the oil tree. The operation is flexible and convenient, saving time and effort. At the same time, for the composite cable casting and fishing electric submersible pump process, the cable crosser can be used to make the composite cable in the oil pipe pass through any position in the middle to the outside of the wellhead device, without passing through the top of the wellhead device, and does not affect the main valve switching function above the upper flange. It meets the well control requirements and ensures the safety and reliability of the wellhead device.

[0046] For ease of description, spatially relative terms such as "upper", "lower", "outer layer", "inner layer" and the like are used in the embodiments to illustrate the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that in addition to the orientation shown in the figures, the spatial terms are intended to include different orientations of the device in use or operation. Therefore, the exemplary term "lower" can include both upper and lower orientations.

[0047] Furthermore, relational terms such as "3" and "4" etc. are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0048] Although the preferred implementation cases of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the invention spirit and claims, which all fall within the scope of protection of the present invention.

Claims

1. A three-section right-angle plug-in wellhead cable pass-through, characterized in that: It includes a female body of a crosser, a male body of a crosser and a ground plug. The female body of the crosser is arranged in the vertical crossing hole of the oil pipe hanger. One end of the male body of the crosser is inserted into the transverse crossing hole of the oil pipe four-way body and the transverse crossing hole of the oil pipe hanger from the outside in sequence. The transverse crossing hole of the oil pipe hanger is connected with its vertical crossing hole. A first right-angle connecting copper sleeve is arranged in the female body of the crosser. The first right-angle connecting copper sleeve is used to realize the right-angle plug-in cable wellhead crossing. The two ends of the male body of the crosser are respectively connected with the female body of the crosser and the ground plug.

2. The three-section right-angle plug-in wellhead cable pass-through according to claim 1 is characterized in that: A power cable is provided at the lower end of the female body of the penetration device, and the power cable is connected to the downhole submersible motor. The first right-angle connecting copper sleeve is provided at the upper end of the female body of the penetration device, and the first right-angle connecting copper sleeve is provided with a plurality of L-shaped inner holes. The power cable is stripped of the cable copper core and pre-inserted into the inner hole, and the lateral part of the inner hole is used to dock with the male body of the penetration device.

3. The three-section right-angle plug-in wellhead cable pass-through according to claim 2 is characterized in that: The gap in the female connector body of the penetration device is filled with a first insulating rubber.

4. The three-section right-angle plug-in wellhead cable pass-through according to claim 2 is characterized in that: A positioning step is arranged on the outer periphery of the female head body of the penetration device, and a locking sleeve is arranged below the positioning step.

5. The three-section right-angle plug-in wellhead cable pass-through according to claim 4 is characterized in that: A first O-type sealing ring is arranged above the positioning step.

6. The three-section right-angle plug-in wellhead cable passer according to any one of claims 2 to 5, characterized in that: An inner plug and an outer plug are respectively provided at the inner and outer ends of the male plug body of the penetration device, a conductive copper rod is provided between the inner and outer plugs, an inner pin and an outer pin are respectively provided at the inner and outer ends of the conductive copper rod, the inner pin and the outer pin extend out of the inner plug and the outer plug respectively, the inner pin is docked with the transverse inner hole of the first right-angle connecting copper sleeve, and the outer pin is used to dock with the ground plug.

7. The three-section right-angle plug-in wellhead cable pass-through according to claim 6 is characterized in that: The gap between the inner plug and the conductive copper rod is filled with a second insulating rubber, and the gap between the outer plug and the conductive copper rod is filled with a third insulating rubber.

8. The three-section right-angle plug-in wellhead cable pass-through according to claim 6 is characterized in that: A fourth O-ring is provided between the outer periphery of the external plug and the inner hole of the male body of the penetration device, and a step surface is provided on the outer periphery of the external plug extending out of the inner hole of the male body of the penetration device. The external plug is locked and fastened with the outer thread of the male body of the penetration device by a fastening nut.

9. The three-section right-angle plug-in wellhead cable pass-through according to claim 6 is characterized in that: A ground cable is provided at one end of the ground plug, and the ground cable is used to connect to the ground junction box; a second connecting copper sleeve is provided at the other end of the ground plug, and the ground cable is stripped of its cable copper core and pre-inserted into the inner hole of the second connecting copper sleeve, and the inner hole of the second connecting copper sleeve is connected to the external plug pin.

10. A method for installing and maintaining the three-section right-angle plug-in wellhead cable pass-through device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step a: After the casing is lowered during the completion operation, the tubing spool body is installed and tightened; Step b: inserting the female body of the wellhead penetration device into the vertical penetration hole of the tubing hanger; Step c: Install the tubing hanger, paying attention to the orientation of the tubing hanger to ensure that the transverse through hole of the tubing hanger and the transverse through hole of the tubing spool are aligned; Step d: Insert the inner pin of the male connector of the through-hole into the inner hole of the first right-angle connecting copper sleeve; Step e: Install the ground plug and finally connect the ground cable to the wellhead junction box; Step f: If the submersible pump cable fails, just remove the ground plug and the male body of the crosser for electrical testing. If the ground plug and the male body of the cable crosser fail, they can be replaced directly without removing the Christmas tree. If the female body of the crosser and the downhole power cable fail, it is necessary to re-lift the tubing hanger and reinstall the cable crosser.

Images