Wellhead cable penetrating device for cable dropping and fishing electric submersible pump system

Abstract

The utility model relates to the technical field of cable penetrating devices, and discloses a wellhead cable penetrating device for a cable dropping and fishing electric submersible pump system. Comprising a main body penetrating device with a first sealing body, a rigid pipe assembly which is in threaded connection with one end of the main body penetrating device and is internally provided with a power cable in a penetrating manner, a ground main body which is detachably connected with the side surface of the main body penetrating device in a pluggable manner, and a ground elbow which is detachably connected with the ground main body in a pluggable manner and is internally connected with a ground cable, insulation conducting rods are fixed in the main body penetrating device and the ground main body. The wellhead cable penetrating device has the advantages that the wellhead cable penetrating device for the cable throwing and fishing electric submersible pump system can be clamped and fixed in a connecting flange of a Christmas tree, can bear the gravity transmitted by a power cable to an electric submersible pump unit, and can bear upward tension when the electric submersible pump unit is lifted. The whole structure can bear vertical tension of 80 tons to the maximum, can bear severe working environments of acid, alkali, crude oil and the like, and can be effectively suitable for operation of a throwing and fishing electric submersible pump system.

Description

Technical Field

[0001] The utility model relates to the technical field of cable crossers, in particular to a wellhead cable crosser used for a cable casting and fishing electric submersible pump system. Background Art

[0002] The cable-casting ESP system is a technical solution that uses a cable winch to lower the cable from the casing to lower the ESP unit to the underground hanging position. When taking out the ESP unit, the cable winch is used to retract the cable upward to pull out the ESP unit. This cable-casting ESP system does not require tubing to operate when lowering and taking out the ESP unit. Compared with conventional ESP systems, its operation is more convenient and faster.

[0003] However, the above-mentioned cable-casting and fishing submersible pump system requires the cable to provide power to the submersible pump unit and bear force at the same time. In order to satisfy the requirement that the cable provides power and force to the submersible pump unit, the cable needs to use a stronger power cable, which is heavier than traditional cables, such as armored cables. When the cable-casting and fishing submersible pump system is working, the power cable is first lowered by the cable winch so that the submersible pump unit is lowered to the specified position, and then the cable slip is used to temporarily suspend the weight of the power cable and submersible pump unit in the well. Then, the power cable is cut off at a preset length above the wellhead at the position between the cable winch and the wellhead, and then the power cable at the wellhead is connected to the cable crosser. The cable crosser in the existing technology is often used for the connection of downhole power cables, and cannot meet the gravity bearing requirements of downhole power cables and submersible pump units.

[0004] In the patent literature, for example, the utility model patent with the authorization announcement number CN 214660057 U and the name of a connecting device for a power cable and a transducer discloses a connecting device for a power cable and a transducer, including a cable bridle and a support structure; the cable bridle is used to clamp the power cable, the upper end of the cable bridle is connected to a wellhead transducer, the outer side of the wellhead transducer is sealed with the support structure, the support structure is used to seal and connect the top of the Christmas tree cap, and the core wire of the power cable can be connected to the transducer through the wellhead transducer. It can realize the electric power connection between the power cable downhole and the transducer on the ground; it can realize the weight of the power cable downhole and the submersible pump unit. However, during long-term use, this technical solution may still have the problem of being unable to bear the weight of the power cable and submersible pump unit downhole and unable to withstand the tension of the cable winch. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art that the cable crossing device in the cable casting and fishing submersible pump system has poor bearing capacity and weak tensile bearing capacity, the utility model proposes a wellhead cable crossing device for the cable casting and fishing submersible pump system for the cable casting and fishing submersible pump system. The main body crossing device of the casting and fishing submersible pump wellhead bears the weight of the power cable and the submersible pump unit, and bears the tensile force of the cable winch when pulling up. The detailed technical scheme is as follows:

[0006] A wellhead cable passer for a cable casting and catching submersible pump system, used for connecting a ground cable with a power cable, comprising a main body passer with a first sealing body, a rigid pipe assembly threadedly connected to the main body passer and having a power cable inserted therein, a ground body separably pluggably connected to the side of the main body passer, and a ground elbow separably pluggably connected to the ground body and having a ground cable connected therein; insulating conductive rods are fixed in both the main body passer and the ground body; one end of the insulating conductive rod in the main body passer is connected to the power cable, and the other end is fixed in the first sealing body; one end of the insulating conductive rod in the ground body is connected to the ground cable in the ground elbow, and the other end can be inserted into the first sealing body and connected to the insulating conductive rod in the main body passer.

[0007] Furthermore, the main body penetrater includes a first shell, a second shell threadedly connected to the first shell and fixed by bolts and locating pins, a first sealing body located inside the first shell, a second sealing body located at the connection between the first shell and the second shell, and an insulating conductive rod located in the second shell, passing through the second sealing body and connected to the first sealing body.

[0008] Furthermore, the first shell is a stepped cylindrical structure, including a top cylinder and a bottom cylinder; a first through hole is opened on the bottom cylinder along the axial direction; a second through hole is opened on the side of the top cylinder; the first through hole and the second through hole are connected; and a mounting plate with multiple mounting holes is also provided on the outer surface of the bottom cylinder.

[0009] Furthermore, the second shell is a cylindrical structure, and a third through hole penetrating the second shell is arranged inside; the second shell is threadedly connected to the first shell and is connected to a plurality of bolts and positioning pins through a mounting plate.

[0010] Furthermore, the first sealing body is a cylindrical glue layer formed by filling PEEK glue and located in the second through hole; the first sealing body is provided with a first conductive tube inside in parallel with the axial direction, and the first conductive tube is electrically connected with a first elastic electrode ring.

[0011] Furthermore, the second sealing body is a vertical cylindrical glue layer formed by filling with PEEK glue and located inside the first shell and the second shell; the middle part of the insulating conductive rod located in the main body through the second seal and is connected to the first sealing body at the end.

[0012] Furthermore, the rigid tube assembly is a long strip structure, and a fourth through hole is opened in the length direction to penetrate the rigid tube assembly; an opening is opened on the side of the rigid tube assembly, a cable clamp is arranged inside, and a connecting part is arranged at one end; a hydraulic control pipeline is also arranged inside the rigid tube assembly, and a ferrule joint is arranged inside the second shell; the bottom of the hydraulic control pipeline is connected to the hydraulic control claw, and the top passes through the rigid tube assembly and is connected to the ferrule joint.

[0013] Furthermore, the connecting part is provided with an annular connecting groove on the outer surface; the connecting part is threadedly connected to the inner side of the second shell, and the connecting part is connected to the second shell by inserting a hexagonal flat-end set screw into the connecting groove of the connecting part from the outer side of the second shell.

[0014] Furthermore, the ground body includes a third shell that is hollow inside and cylindrical with external threads, an adapter joint that is fitted on one end of the third shell, an adapter screw cap that is fitted on the outside of the third shell and threadedly connected to the adapter joint, and a fixing plate connected to the end of the adapter joint away from the third shell; an insulating conductive rod is arranged in the ground body, and one end of the insulating conductive rod away from the third shell is extended out of the outer surface of the ground body, and the other end is located in the third shell.

[0015] Furthermore, the ground elbow includes a bent fourth shell and a ground cable connected to the bottom of the fourth shell; an insertion hole is provided inside the fourth shell; the fourth shell is threadedly connected to the third shell, and during the threaded connection process, the insulated conductive rod in the third shell is inserted into the insertion hole.

[0016] According to any of the above embodiments, the utility model has at least the following beneficial effects: providing a wellhead cable pass-through for a cable-casting electric submersible pump system, which can be snap-fitted and fixed inside the connection flange of the Christmas tree, and can withstand the gravity of the electric submersible pump unit transmitted by the power cable, and can withstand the upward pulling force when lifting the electric submersible pump unit. The overall structure can withstand a maximum vertical pulling force of 80 tons, can withstand harsh working environments such as acid, alkali, and crude oil, and can be effectively applied to the work of the casting and fishing electric submersible pump system.

[0017] In terms of structural design, the wellhead cable crosser is designed to be a main crosser and a rigid pipe assembly for vertical force. The connection between the power cable and the ground cable adopts a horizontal plug-in design to prevent the ground main body and the ground elbow from bearing vertical force. At the same time, the connection between the power cable and the ground cable can be completed during the plug-in process, which simplifies the installation process and saves installation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a structural schematic diagram of a wellhead cable penetrator.

[0019] Figure 2 It is a structural schematic diagram of the main body crossing device of the utility model.

[0020] Figure 3 It is a schematic diagram of the assembly of the first shell and the second shell of the utility model.

[0021] Figure 4 It is a schematic diagram of the internal connection of the main body crosser of the utility model.

[0022] Figure 5 yes Figure 4 A partial enlarged view.

[0023] Figure 6 yes Figure 4 A partial enlarged view of B.

[0024] Figure 7 It is a structural schematic diagram of the rigid pipe assembly of the utility model.

[0025] Figure 8 It is a schematic diagram of the connection between the main body penetrator and the rigid pipe assembly of the utility model.

[0026] Fig. 9 It is a cross-sectional view of the main body penetrator and the rigid pipe assembly of the utility model.

[0027] Fig.10 It is a structural schematic diagram of the ground main body of the utility model.

[0028] Fig.11 It is a cross-sectional view of the ground main body of the utility model.

[0029] Fig.12 It is a structural schematic diagram of the ground elbow of the utility model.

[0030] Fig.13 It is a cross-sectional view of the ground elbow of the utility model.

[0031] Fig.14 The utility model is an assembly diagram of a wellhead cable penetrator.

[0032] in:

[0033] 100—main body penetrator; 200—ground body; 300—ground elbow; 400—rigid pipe assembly;

[0034] 500—power cable; 600—ground cable;

[0035] 110—first housing; 120—second housing; 130—first sealing body; 140—second sealing body;

[0036] 150—insulated conductive rod;

[0037] 111—first through hole; 112—second through hole; 113—mounting plate;

[0038] 121—third through hole; 122—first limiting portion; 123—second limiting portion;

[0039] 131 - first conductive tube; 132 - first elastic electrode ring; 133 - first insulating pad;

[0040] 141 - second conductive tube; 142 - second elastic electrode ring; 143 - second insulating pad 143;

[0041] 210—third housing; 220—adapter screw cap; 230—adapter connector; 240—fixing plate;

[0042] 250—short-circuit cable;

[0043] 310—fourth housing; 320—connecting housing; 330—insertion hole; 340—third conductive cylinder;

[0044] 350—third elastic electrode ring;

[0045] 410—opening; 420—cable clamp; 430—connecting portion; 440—fourth through hole; 450—hydraulic control pipeline. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] A wellhead cable crossing device for a cable casting and fishing electric submersible pump system is used to connect the ground cable with the power cable. Figure 1As shown, it includes a main body penetrater 100, a ground body 200 plug-in connected to the main body penetrater 100, a ground elbow 300 with one end plug-in connected to the ground body 200 and the other end connected to the ground cable, and a rigid pipe assembly 400 connected to the bottom of the main body penetrater 100.

[0048] The structure of the main body traverser 100 is as follows: Figure 2 As shown, it includes a first shell 110, a second shell 120 threadedly connected to the first shell 110 and fixed by bolts and locating pins, a first sealing body 130 located in the first shell 110, a second sealing body 140 located at the connection between the first shell 110 and the second shell 120, and an insulating conductive rod 150 located in the second shell 120 and passing through the second sealing body 140 and connected to the first sealing body 130.

[0049] The structure of the first housing 110 is as follows Figure 2 and Figure 3 As shown, it is a stepped cylindrical structure, with a larger cylinder at the top and a smaller coaxial cylinder at the bottom. A first circular through hole 111 is provided on the bottom cylinder along the axial direction, penetrating the bottom cylinder. A second circular through hole 112 is provided on the side of the top cylinder along the axial direction perpendicular to the axial direction, penetrating the outer side surface of one end. The first through hole 111 and the second through hole 112 are connected. A mounting plate 113 with a plurality of mounting holes is also provided on the outer surface of the bottom cylinder. An external thread is provided on the side of the mounting plate 113 away from the top cylinder. The structure of the second shell 120 is shown in FIG. Figure 2 and Figure 3 As shown, it is a cylindrical structure, and a third through hole 121 penetrating the second shell 120 is provided inside along its axial direction. The second shell 120 is provided with a first limiter 122 and a second limiter 123 on the outer surface of one end, and a corresponding internal thread is provided on the inner surface of the other end and a corresponding mounting hole is provided on the upper surface. The first limiter 122 and the second limiter 123 are used to adapt to the connection flange of the oil tree and are used for upward and downward limiting respectively. The connection between the first shell 110 and the second shell 120 is as shown in FIG. Figure 3 As shown, firstly, they are connected by internal and external threads, and then the mounting plate 113 is flush with the upper surface of the second housing 120. The size of the mounting plate 113 is consistent with the size of the upper surface of the second housing 120. A plurality of bolts and positioning pins are installed in the corresponding mounting holes to connect the first housing 110 and the second housing 120. At the same time, in order to increase the sealing performance of the structure, a plurality of annular grooves (not marked in the drawings) are also provided on the outer sides of the first housing 110 and the second housing 120, and the annular grooves are used to install "0"-shaped sealing rings (not marked in the drawings).

[0050] The first sealing body 130, the second sealing body 140 and the insulating conductive rod 150 are connected as shown in FIG. Figure 4As shown. The first sealing body 130 is a horizontal cylindrical glue layer formed by filling with PEEK glue and located in the second through hole 112. The second sealing body 140 is a vertical cylindrical glue layer formed by filling with PEEK glue and located in the first shell 110 and the second shell 120. The middle part of the insulated conductive rod 150 passes through the second sealing body 140 and is connected to the first sealing body 130 at the end. The first sealing body 130 is as shown in FIG. Figure 5 As shown, a first conductive cylinder 131 is arranged in a direction parallel to the axis, a first elastic electrode ring 132 electrically connected to the first conductive cylinder 131 is arranged inside the first conductive cylinder 131, and a first insulating pad 133 is also arranged outside the first sealing body 130. One end of the insulating conductive rod 150 is inserted into the first sealing body 130 and electrically connected to the first conductive cylinder 131. The second sealing body 140 is as shown in FIG. Figure 6 As shown, a second conductive cylinder 141 is arranged in a direction parallel to the axis, and two second elastic electrode rings 142 are arranged on the left and right sides of the second conductive cylinder 141. Two insulating conductive rods 150 are respectively inserted into the elastic electrode rings 142. When the insulating conductive rods 150 are inserted, the elastic electrode rings 142 are stretched open so that the insulating conductive rods 150 are respectively electrically connected to the second conductive cylinder 141, thereby making the two insulating conductive rods 150 electrically connected. In order to increase the insulation of the second sealing body 140, a second insulating pad 143 is similarly arranged in the second sealing body. The first sealing body 130 is used to electrically connect the insulating conductive rod 150 to the ground body 200. The second sealing body 140 is used for the electrical connection between the two insulating conductive rods in the first shell 100 and the second shell 200.

[0051] The structure of the rigid tube assembly 400 is as follows: Figure 7 As shown, it is a long round tube structure, along the length direction of which a fourth through hole 440 is provided which is circular and penetrates the rigid tube assembly 400, an opening 410 is provided on the side, a cable clamp 420 is provided inside, and a connecting portion 430 is provided at one end. The opening 410 is used to operate the cable clamp 420 to fix the power cable 500, the fourth through hole 440 is used to provide a penetration space for the power cable 500, and the cable clamp 420 is used to fix the power cable 500; the connecting portion 430 is used to connect the rigid tube assembly 400 with the second shell 120, and an annular connecting groove is provided on the outer wall thereof. The connection between the rigid tube assembly 400 and the main body through-device 100 is shown in FIG. Figure 8 and Fig. 9As shown, a power cable 500 is inserted into the rigid tube assembly 400, and the power cable 500 has an armor layer. The cable clamp 420 acts on the armor layer and fixes it to the rigid tube assembly 400. The power cable 500 near the free end of the rigid tube assembly 400 is electrically connected to the insulating conductive rod 150 located in the second shell 200; the connecting portion 430 of the rigid tube assembly 400 is threadedly connected to the second shell 200 on the inner side of the second shell 200 and the hexagonal flat-end set screw is inserted into the connecting groove of the connecting portion 430 on the outer side of the second shell 200, thereby connecting the rigid tube assembly 400 and the second shell 200.

[0052] The structure of the ground body 200 is as follows: Fig.10 and Fig.11 As shown, it includes a third shell 210 with a hollow interior and a cylindrical shape and an external thread, an adapter connector 230 sleeved on one end of the third shell 210, an adapter screw cap 220 sleeved on the outside of the third shell 210 and threadedly connected to the adapter connector 230, and a fixing plate 240 connected to the end of the adapter connector 230 away from the third shell 210. An insulating conductive rod 150 is arranged in the ground body 200, and the insulating conductive rod 150 located at one end of the third shell 210 is located on the inner side of the third shell 210, and the insulating conductive rod 150 at one end of the ground body 200 away from the third shell 210 is extended out of the outer surface of the ground body 200. Further, two insulating conductive rods 150 are arranged in the ground body 200 corresponding to the single-phase cable, and the insulating conductive rods 150 are fixed in the ground body 200 by a sealing body filled with PEEK glue, and connected by a short-circuit cable 250.

[0053] The structure of the ground elbow 300 is as follows Fig.12 and Fig.13 As shown, it includes a bent fourth shell 310 and a ground cable 600 connected to the bottom of the fourth shell 310. A connecting shell 320 is provided at the shell at one end of the fourth shell 310 away from the ground cable 600, and an insertion hole 330 is provided inside the shell. A third conductive cylinder 340 is provided inside the fourth shell 310, and an electrically connected third elastic electrode ring 350 is provided at one end of the third conductive cylinder 340, and an electrically connected metal rod is provided at the other end. After the ground cable 600 is inserted into the fourth shell 310, it is electrically connected to the metal rod of the third conductive cylinder 340. The connecting shell 320 is threadedly connected to the third shell 210, and during the threaded connection process, the insulated conductive rod in the third shell 210 is inserted into the insertion hole 330 and electrically connected to the third elastic electrode ring 350 of the third conductive cylinder 340.

[0054] The overall connection structure of the wellhead cable penetration device is as follows Fig.14As shown, the rigid pipe assembly 400 is connected to the bottom of the second shell 120, the ground body 200 is inserted into the first sealing body 130 of the first shell 110 and the insulating conductive rod 150 is electrically connected to the first conductive cylinder 131, and the insertion hole 330 of the ground elbow 300 is inserted into the insulating conductive rod 150 of the ground body 200 and the insulating conductive rod 150 is electrically connected to the third conductive cylinder 340. The power cable in the rigid pipe assembly 400 is first electrically connected to the insulating conductive rod 150 in the second shell 120 during the structural connection, and then connected to the insulating conductive rod 150 in the first shell 110 through the second sealing body 140, and then electrically connected to the insulating conductive rod 150 in the ground body 200 through the first sealing body 130, and then the ground body 200 and the ground elbow 300 are connected, and finally the power cable 500 in the rigid pipe assembly 400 is electrically connected to the ground cable 600 in the ground elbow 300. In addition, a hydraulic control line 450 is also provided in the rigid pipe assembly 400. The hydraulic control line 450 is made of a steel pipe, and a hydraulic control claw is connected to the bottom, and the hydraulic control claw is fixed to the casing or oil pipe by pressure. The top of the hydraulic control line 450 passes through the rigid pipe assembly 400 and is connected to the second housing 120. A ferrule joint (not shown in the drawing) is provided inside the second housing 120, and the hydraulic control line 450 is fixed by the ferrule joint.

[0055] In terms of structural stress, during normal use, the power cable 500 bears the gravity of the submersible pump unit. The power cable 500 is clamped by the cable clamp 420 in the rigid pipe assembly 400. The main body through-device 100 is located in the connection flange of the oil production tree. The connection flange provides an upward support force, which is transmitted to the power cable 500 through the rigid pipe assembly 400. The multiple bolts in the mounting plate of the first shell 110 are used to withstand the upward tension when lifting the submersible pump unit. The wellhead cable through-device of the utility model has a large vertical tension bearing capacity. Under the conditions of a test pressure of 35MPa and an ambient temperature of -30-200 degrees Celsius, the overall structure can withstand a maximum vertical tension of 80 tons. It can withstand harsh working environments such as acid, alkali, and crude oil, and can be effectively used in the operation of the submersible pump system.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wellhead cable passer for a cable casting and fishing electric submersible pump system, used for connecting a ground cable with a power cable, characterized in that: It includes a main body transit device with a first sealing body, a rigid pipe assembly threadedly connected to the main body transit device and having a power cable inserted inside, a ground body detachably connected to the side of the main body transit device in a plug-in manner, and a ground elbow detachably connected to the ground body in a plug-in manner and having a ground cable connected inside; insulating conductive rods are fixed in both the main body transit device and the ground body; one end of the insulating conductive rod in the main body transit device is connected to the power cable, and the other end is fixed in the first sealing body; one end of the insulating conductive rod in the ground body is connected to the ground cable in the ground elbow, and the other end can be inserted into the first sealing body and connected to the insulating conductive rod in the main body transit device.

2. The wellhead cable crossing device for a cable casting and fishing electric submersible pump system according to claim 1 is characterized in that: The main body penetrater includes a first shell, a second shell threadedly connected to the first shell and fixed by bolts and locating pins, a first sealing body located inside the first shell, a second sealing body located at the connection between the first shell and the second shell, and an insulating conductive rod located in the second shell, passing through the second sealing body and connected to the first sealing body.

3. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 2, characterized in that: The first shell is a stepped cylindrical structure, including a top cylinder and a bottom cylinder; a first through hole is opened on the bottom cylinder along the axial direction; a second through hole is opened on the side of the top cylinder; the first through hole and the second through hole are connected; the bottom cylinder is also provided with a mounting plate with multiple mounting holes on the outer surface.

4. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 3, characterized in that: The second shell is a cylindrical structure, and a third through hole penetrating the second shell is arranged inside; the second shell is threadedly connected to the first shell and is connected to a plurality of bolts and positioning pins through a mounting plate.

5. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 4, characterized in that: The first sealing body is a cylindrical glue layer formed by filling PEEK glue and located in the second through hole; a first conductive cylinder is arranged inside the first sealing body in parallel with the axial direction, and a first elastic electrode ring is electrically connected inside the first conductive cylinder.

6. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 5, characterized in that: The second seal is a vertical cylindrical glue layer formed by PEEK glue filling and located inside the first shell and the second shell; the middle part of the insulating conductive rod located in the main body through the second seal and connected to the first seal at the end.

7. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 2, characterized in that: The rigid tube assembly is a long strip structure, and a fourth through hole penetrating the rigid tube assembly is provided in the length direction; an opening is provided on the side of the rigid tube assembly, a cable clamp is provided inside, and a connecting portion is provided at one end; a hydraulic control pipeline is also provided inside the rigid tube assembly, and a ferrule joint is provided inside the second shell; the bottom of the hydraulic control pipeline is connected to a hydraulic control claw, and the top passes through the rigid tube assembly and is connected to the ferrule joint.

8. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 7, characterized in that: The connecting part is provided with an annular connecting groove on the outer surface; the connecting part is threadedly connected to the inner side of the second shell, and the connecting part is connected to the second shell by inserting a hexagon socket flat-end set screw into the connecting groove of the connecting part from the outer side of the second shell.

9. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 1, characterized in that: The ground body includes a third shell that is hollow inside and cylindrical with external threads, an adapter joint that is sleeved on one end of the third shell, an adapter screw cap that is sleeved on the outside of the third shell and threadedly connected to the adapter joint, and a fixing plate connected to the end of the adapter joint away from the third shell; an insulating conductive rod is arranged in the ground body, and one end of the insulating conductive rod away from the third shell is extended from the outer surface of the ground body, and the other end is located in the third shell.

10. The wellhead cable passer for a cable casting and fishing electric submersible pump system according to claim 9, characterized in that: The ground elbow includes a bent fourth shell and a ground cable connected to the bottom of the fourth shell; an insertion hole is provided inside the fourth shell; the fourth shell is threadedly connected to the third shell, and during the threaded connection process, the insulated conductive rod in the third shell is inserted into the insertion hole.

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