Underground formation current injection electrode

Abstract

The invention discloses an underground formation current injection electrode. The electrode comprises an upper connecting assembly, an electrode body, a lower connecting assembly, an upper multi-core cable and a lower multi-core cable, the upper multi-core cable penetrates through a plurality of mutually isolated holes in the upper connecting assembly, and the lower multi-core cable penetrates through a plurality of mutually isolated holes in the lower connecting assembly; the upper multi-core cable penetrates through a wire passing space arranged in the electrode body and is connected with the lower multi-core cable; the upper multi-core cable comprises a plurality of upper cable leads, and at least one upper cable lead is conducted with the electrode body; and the wire passing space is filled with an insulating medium. The electrode disclosed by the invention is simple in structure, convenient to construct, good in insulativity and high in safety and feasibility.

Description

Technical Field

[0001] This invention relates to the field of well logging technology, and in particular to a downhole formation current injection electrode. Background Technology

[0002] In nuclear magnetic resonance logging, through-casing logging, and magnetic steerable drilling, downhole measurements require the application of electrical signals of specific voltage, current, and frequency to the formation. Currently, the main downhole current injection systems used are single-electrode injection systems, but their application suffers from problems such as high current loss, current flow divergence, and limited measurement depth. Especially in the application of passive active magnetic steerable drilling instruments, they cannot meet the requirements for operation under high current conditions. The currently used three-electrode injection devices also suffer from complex structures, large dimensions, difficulties in running in and out of the well, and high risks. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a downhole formation current injection electrode that overcomes or at least partially solves the above problems.

[0004] In a first aspect, embodiments of the present invention provide a downhole formation current injection electrode, comprising:

[0005] The upper connection assembly, electrode body, and lower connection assembly are connected sequentially from top to bottom, along with the upper multi-core cable and the lower multi-core cable;

[0006] The upper multi-core cable passes through multiple holes that are isolated from each other in the upper connecting assembly, and the lower multi-core cable passes through multiple holes that are isolated from each other in the lower connecting assembly; the upper multi-core cable passes through a wire-passing space provided in the electrode body and is connected to the lower multi-core cable.

[0007] The upper multi-core cable includes multiple upper cable conductors, and at least one upper cable conductor is connected to the electrode body;

[0008] The space between the wires is filled with an insulating medium.

[0009] In one embodiment, the plurality of holes in the upper connection assembly that are isolated from each other include a first wire-passing hole; the plurality of holes in the lower connection assembly that are isolated from each other include a second wire-passing hole;

[0010] The lower multi-core cable includes multiple lower cable conductors;

[0011] At least one upper cable conductor passes through the first cable pass-through hole and the cable pass-through space, and is connected to at least one lower cable conductor passing through the second cable pass-through hole.

[0012] In one embodiment, the plurality of holes in the upper connection assembly that are isolated from each other include a first tapered hole; the plurality of holes in the lower connection assembly that are connected to each other include a second tapered hole;

[0013] The upper multi-core cable also includes multiple upper cable load-bearing steel wires; the lower multi-core cable also includes multiple lower cable load-bearing steel wires;

[0014] The upper cable load-bearing wire passes through the first conical hole, and the lower cable load-bearing wire passes through the second conical hole. At least one upper cable load-bearing wire and at least one lower cable load-bearing wire are connected to each other.

[0015] In one embodiment, the at least one upper cable load-bearing wire is connected to at least one lower cable load-bearing wire, including:

[0016] At least one steel wire connecting conductor is provided in the wire passage space;

[0017] One end of the steel wire connecting conductor is connected to the upper cable load-bearing steel wire, and the other end of the steel wire connecting conductor is connected to the lower cable load-bearing steel wire.

[0018] In one embodiment, the upper connection assembly includes: an upper suspension head, a plurality of first conical sleeves and second conical sleeves;

[0019] The upper suspension head is provided with a plurality of first wire-passing holes and a plurality of first conical holes;

[0020] The first conical sleeve and the second conical sleeve are respectively disposed in the first conical hole; the second conical sleeve is disposed in the space formed by the plurality of first conical sleeves;

[0021] The lower connection assembly includes: a lower suspension head, multiple third cone sleeves, and a fourth cone sleeve;

[0022] The lower suspension head is provided with a plurality of second wire-passing holes and a plurality of second conical holes;

[0023] The third and fourth conical sleeves are respectively disposed in the second conical hole; the fourth conical sleeve is disposed in the space formed by the multiple third conical sleeves.

[0024] In one embodiment, the upper connection assembly further includes: an upper suspension seat and an upper conical spring;

[0025] The upper suspension seat is sleeved on the outside of the upper suspension head; one end of the upper suspension seat is connected to the conical spring, and the other end of the upper suspension seat is connected to the electrode body;

[0026] One end of the upper conical spring is sleeved on the outside of the upper multi-core cable, and the other end of the upper conical spring is sleeved on the outside of the upper suspension seat;

[0027] The lower connection assembly further includes: a lower suspension seat and a lower conical spring;

[0028] The lower suspension seat is sleeved on the outside of the lower suspension head; one end of the lower suspension seat is connected to the conical spring, and the other end of the lower suspension seat is connected to the electrode body;

[0029] One end of the lower conical spring is sleeved on the outside of the lower multi-core cable, and the other end of the lower conical spring is sleeved on the outside of the lower suspension seat.

[0030] In one embodiment, the upper connection assembly further includes: an upper tapered rubber sleeve;

[0031] The upper conical rubber sleeve is disposed between the upper suspension seat and the upper suspension head; one end of the upper conical rubber sleeve is sleeved on the outside of the upper multi-core cable, and the other end of the upper conical rubber sleeve is sleeved on the outside of the upper suspension head;

[0032] The lower connection assembly further includes: a lower tapered rubber sleeve;

[0033] The lower conical rubber sleeve is disposed between the lower suspension seat and the lower suspension head; one end of the lower conical rubber sleeve is sleeved on the outside of the lower multi-core cable, and the other end of the lower conical rubber sleeve is sleeved on the outside of the lower suspension head.

[0034] In one embodiment, the upper connection assembly further includes: an upper insulating ring.

[0035] The upper insulating ring is disposed between the upper suspension head and the electrode body;

[0036] The lower connection assembly further includes: a lower insulating ring;

[0037] The lower insulating ring is disposed between the lower suspension head and the electrode body.

[0038] In one embodiment, the insulating medium is silicone grease.

[0039] In one embodiment, a conductive ring is also included;

[0040] The conductive ring is disposed between the electrode body and the lower insulating ring; or the conductive ring is disposed between the electrode body and the upper insulating ring; the conductive ring is electrically connected to the electrode body;

[0041] The conductive ring is connected to at least one of the upper cable conductors through the first wire-passing hole and the wire-passing space.

[0042] Secondly, embodiments of the present invention provide a multi-electrode magnetic detection system, characterized in that it includes: a plurality of electrodes and magnetic detection devices as described in any of the above embodiments.

[0043] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0044] This invention provides a downhole formation current injection electrode, comprising an electrode body, and symmetrically arranged upper and lower connecting assemblies, upper multi-core cables, lower connecting assemblies, and lower multi-core cables. The upper end of the upper multi-core cable is connected to a logging cable via a torpedo head, and the lower end of the lower multi-core cable is connected to a downhole measuring instrument via a torpedo head. During operation, the surface controls the logging cable, applying an electrical signal to the electrode body through the upper multi-core cable to transmit current into the formation. The upper multi-core cable is also connected to the downhole measuring instrument at the bottom of the electrode, transmitting the measurement signal to the surface, thus forming a complete excitation and measurement system. The upper and lower connecting assemblies contain multiple isolated holes, and the electrode body contains a wire-passing space for different wires in the upper and lower multi-core cables to pass through, avoiding mutual interference between the wires in the upper and lower multi-core cables. This ensures that the upper multi-core cable safely supplies power to the electrode body without affecting the use of the downhole measuring instrument. The wire passage space of the electrode body is filled with an insulating medium, which serves to insulate and waterproof the various wires passing through the electrode body, as well as increase the rigidity of the electrode body.

[0045] The electrode structure provided in this invention is simple and easy to install, facilitating downhole construction. The conductors in both the upper and lower multi-core cables have good insulation, resulting in high safety and feasibility.

[0046] Furthermore, this invention also provides a multi-electrode magnetic detection system, comprising multiple series-connected downhole formation current injection electrodes and a connected magnetic detection device. This allows for the handling of larger currents and the transmission of electrical signals over longer distances, expanding the application to various downhole formation measurement scenarios requiring power.

[0047] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0048] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0049] Figure 1 This is a schematic diagram of the downhole formation current injection electrode structure in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the multi-core cable structure in an embodiment of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Upper multi-core cable; 2. Upper conical spring; 3. Upper conical rubber sleeve; 4. Upper suspension head; 5. First conical sleeve; 6. Second conical sleeve; 7. Upper suspension seat; 8. Upper insulating ring; 9. Upper sealing ring; 10. Upper guide pin; 11. Upper slip ring; 12. Upper connecting screw; 13. Electrode body; 14. Sealing bolt; 15. Steel wire connecting conductor; 16. Lower connecting screw; 17. Lower slip ring; 18. Lower guide pin; 19. Lower sealing ring; 20. Fixing screw; 21. Conductive ring; 22. Lower insulating ring; 23. Lower suspension seat; 24. Fourth conical sleeve; 25. Third conical sleeve; 26. Lower suspension head; 27. Lower conical rubber sleeve; 28. Lower conical spring; 29. ​​Lower multi-core cable; 30. Upper cable outer protective layer; 31. Upper cable conductor; 32. Upper cable inner protective layer; 33. Upper cable load-bearing steel wire. Detailed Implementation

[0053] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0054] This invention provides a downhole formation current injection electrode, with reference to... Figure 1 and Figure 2 As shown, it includes:

[0055] The upper connection assembly, electrode body 13 and lower connection assembly, as well as the upper multi-core cable 1 and lower multi-core cable 29 are connected sequentially from top to bottom;

[0056] The upper multi-core cable 1 passes through multiple holes that are isolated from each other in the upper connecting assembly, and the lower multi-core cable 29 passes through multiple holes that are isolated from each other in the lower connecting assembly; the upper multi-core cable 1 passes through the wire-passing space provided in the electrode body 13 and is connected to the lower multi-core cable 29.

[0057] The upper multi-core cable 1 includes multiple upper cable conductors 31, and at least one upper cable conductor 31 is connected to the electrode body 13.

[0058] The space between the wires is filled with an insulating medium.

[0059] The downhole formation current injection electrode provided in this embodiment of the invention includes an upper multi-core cable 1, an upper connecting assembly, an electrode body 13, a lower connecting assembly, and a lower multi-core cable 29. The upper multi-core cable 1 and the lower multi-core cable 29, as well as the upper connecting assembly and the lower connecting assembly, have similar structures and are disposed on the upper and lower parts of the electrode body 13, respectively. During operation, the upper end of the upper multi-core cable 1 is connected to a logging cable via a torpedo head, and the lower end of the lower multi-core cable 29 is connected to a downhole measuring instrument via a torpedo head.

[0060] The upper and lower connecting assemblies each have multiple isolated holes through which the upper multi-core cable 1 and the lower multi-core cable 29 pass and are secured within the upper and lower connecting assemblies, respectively. The upper and lower connecting assemblies are then connected and fixed to the adjacent electrode body 13. The electrode body 13 has a wiring space for connecting the upper multi-core cable 1 to the electrode body 13 and for connecting the upper multi-core cable 1 to the lower multi-core cable 29. The upper multi-core cable 1, the upper connecting assembly, the electrode body 13, the lower connecting assembly, and the lower multi-core cable 29 together form a reliable integrated structure. The downhole formation current injection electrode provided in this embodiment not only achieves electrical connection between the upper multi-core cable 1 and the electrode body 13, enabling current injection into the formation, but also utilizes the multiple isolated holes in the upper and lower connecting assemblies, as well as the wiring space within the electrode body 13, for different conductors of the upper multi-core cable 1 and the lower multi-core cable 29 to pass through, avoiding interference between the conductor energizing the electrode and other conductors in the cable. In addition, the wire passage space of the electrode body 13 is filled with an insulating medium, which further insulates and waterproofs the various wires passing through the electrode body 13, and increases the rigidity of the electrode body 13.

[0061] In one embodiment, refer to Figure 2 As shown, the upper multi-core cable 1 includes an upper cable outer protective layer 30, multiple upper cable conductors 31, an upper cable inner protective layer 32, and multiple upper cable load-bearing steel wires 33. The structure of the lower multi-core cable 29 is similar to that of the upper multi-core cable 1, also including a lower cable outer protective layer, multiple lower cable conductors, a lower cable inner protective layer, and multiple lower cable load-bearing steel wires. The specific structure of the lower multi-core cable 29 will not be described in detail here. Figure 2 (Not shown in the text).

[0062] In one embodiment, refer to Figure 1 and Figure 2 As shown, the upper connection assembly has multiple holes that are isolated from each other, including a first wire passage hole; the lower connection assembly has multiple holes that are isolated from each other, including a second wire passage hole; the lower multi-core cable 29 includes multiple lower cable conductors, and at least one upper cable conductor 31 passes through the first wire passage hole and the wire passage space in the electrode body 13, and is connected to each other with at least one lower cable conductor that passes through the second wire passage hole.

[0063] This achieves the connection of at least one upper cable conductor 31 in the upper multi-core cable 1 and at least one lower cable conductor in the lower multi-core cable 29 across the electrode body 13, ensuring the requirements of the electrode provided in this embodiment of the invention for powering, transmitting and controlling the instruments and devices connected to the lower part.

[0064] In one embodiment, refer to Figure 1 and Figure 2 As shown, the upper connecting assembly has multiple holes isolated from each other, including a first conical hole, and the lower connecting assembly has multiple holes isolated from each other, including a second conical hole; the upper multi-core cable 1 also includes multiple upper cable load-bearing steel wires 33, and the lower multi-core cable 29 also includes multiple lower cable load-bearing steel wires; the multiple upper cable load-bearing steel wires 33 pass through the first conical hole, and the multiple lower cable load-bearing steel wires also pass through the second conical hole, and at least one upper cable load-bearing steel wire 33 and at least one lower cable load-bearing steel wire are interconnected with each other.

[0065] In one embodiment, refer to Figure 1 and Figure 2 As shown, the connection between at least one upper cable bearing steel wire 33 and at least one lower cable bearing steel wire includes: at least one steel wire connecting conductor 15 is provided in the cable passage space, one end of the steel wire connecting conductor 15 is connected to the upper cable bearing steel wire 33, and the other end of the steel wire connecting conductor 15 is connected to the lower cable bearing steel wire.

[0066] The cross electrode body 13 is connected between the upper cable load-bearing steel wire 33 in the upper multi-core cable 1 and the lower cable load-bearing steel wire in the lower multi-core cable 29, so that the upper cable load-bearing steel wire 33 and the lower cable load-bearing steel wire connected together can meet their functions as circuits or signal transmission loops while mainly bearing tensile loads.

[0067] In one embodiment, refer to Figure 1 As shown, multiple holes isolated from each other in the upper connecting assembly are disposed within the upper suspension head 4, and multiple holes isolated from each other in the lower connecting assembly are disposed within the lower suspension head 26. The upper connecting assembly includes: an upper suspension head 4, multiple first conical sleeves 5, and a second conical sleeve 6; the upper suspension head 4 is provided with multiple first wire-passing holes and multiple first conical holes; the first conical sleeves 5 and the second conical sleeves 6 are respectively disposed within the first conical holes, and the second conical sleeve 6 is disposed within the space formed by the multiple first conical sleeves 5. (Refer to...) Figure 1 and Figure 2 As shown, the upper cable load-bearing steel wire 33 in the upper multi-core cable 1 is divided into two layers, referred to as the first outer layer steel wire and the first inner layer steel wire. The first outer layer steel wire passes through and is secured within multiple first conical sleeves 5. The first conical sleeves 5 are embedded in and locked into the first conical holes in the upper suspension head 4. The first inner layer steel wire passes through and is secured within second conical sleeves 6. The second conical sleeves 6 are also embedded in and locked into the first conical holes in the upper suspension head 4. This achieves the connection between the upper cable load-bearing steel wire 33 in the upper multi-core cable 1 and the upper suspension head 4.

[0068] Similarly, the lower connection assembly includes: a lower suspension head 26, multiple third conical sleeves 25, and a fourth conical sleeve 24; the lower suspension head is provided with multiple second wire passage holes and multiple second conical holes; the third conical sleeves 25 and the fourth conical sleeves 24 are respectively disposed in the second conical holes, and the fourth conical sleeve 24 is disposed in the space formed by the multiple third conical sleeves 25. The lower cable load-bearing steel wire in the lower multi-core cable 29 is divided into inner and outer layers, referred to as the second outer layer steel wire and the second inner layer steel wire, as shown in the reference. Figure 1 The connection between the second outer steel wire and the second inner steel wire, which passes through the third cone sleeve 25 and the fourth cone sleeve 24 and is connected to the lower suspension head 26, is the same as the connection between the first outer steel wire, the first inner steel wire and the upper suspension head 4.

[0069] In one embodiment, refer to Figure 1 As shown, the upper connection assembly further includes: an upper suspension seat 7 and an upper conical spring 2; the upper suspension seat 7 is sleeved on the outside of the upper suspension head 4; one end of the upper suspension seat 7 is connected to the conical spring, and the other end of the upper suspension seat 7 is connected to the electrode body 13; one end of the upper conical spring 2 is sleeved on the outside of the upper multi-core cable 1, and the other end of the upper conical spring 2 is sleeved on the outside of the upper suspension seat 7. Similarly, the lower connection assembly further includes: a lower suspension seat 23 and a lower conical spring 28; the lower suspension seat 23 is sleeved on the outside of the lower suspension head 26, one end of the lower suspension seat 23 is connected to the conical spring, and the other end of the lower suspension seat 23 is connected to the electrode body 13; one end of the lower conical spring 28 is sleeved on the outside of the lower multi-core cable 29, and the other end of the lower conical spring 28 is sleeved on the outside of the lower suspension seat 23.

[0070] Reference Figure 1 and Figure 2 As shown, the upper cable load-bearing steel wire 33 in the upper multi-core cable 1 is connected to the upper suspension head 4, and the upper suspension seat 7 can support the upper cable load-bearing steel wire 33 and the upper suspension head 4. Similarly, the lower suspension seat 23 can support the lower cable load-bearing steel wire and the lower suspension head 26.

[0071] In one embodiment, refer to Figure 1 As shown, the upper connecting assembly further includes: an upper conical rubber sleeve 3; the upper conical rubber sleeve 3 is disposed between the upper suspension seat 7 and the upper suspension head 4, one end of the upper conical rubber sleeve 3 is sleeved on the outside of the upper multi-core cable 1, and the other end of the upper conical rubber sleeve 3 is sleeved on the outside of the upper suspension head 4. The lower connecting assembly further includes: a lower conical rubber sleeve 27; the lower conical rubber sleeve 27 is disposed between the lower suspension seat 23 and the lower suspension head 26, one end of the lower conical rubber sleeve 27 is sleeved on the outside of the lower multi-core cable 29, and the other end of the lower conical rubber sleeve 27 is sleeved on the outside of the lower suspension head 26.

[0072] The upper conical rubber sleeve 3 serves to insulate the upper cable load-bearing steel wire 33, the upper suspension head 4 and the upper suspension seat 7, and the electrode body 13. Similarly, the lower conical rubber sleeve 27 serves to insulate the lower cable load-bearing steel wire, the lower suspension head 26 and the lower suspension seat 23, and the electrode body 13.

[0073] In one embodiment, refer to Figure 1 As shown, the upper connecting assembly also includes an upper insulating ring 8; the upper insulating ring 8 is disposed between the upper suspension head 4 and the electrode body 13. The lower connecting assembly also includes a lower insulating ring 22; the lower insulating ring 22 is disposed between the lower suspension head 26 and the electrode body 13.

[0074] The upper insulating ring 8 serves to insulate the electrode body 13 and the upper suspension head 4. The lower insulating ring 22 serves to insulate the electrode body 13 and the lower suspension head 26.

[0075] In one embodiment, refer to Figure 1 As shown, the upper connection assembly also includes an upper sealing ring 9 and an upper guide pin 10 disposed between the upper suspension seat 7 and the electrode body 13; symmetrically, the lower connection assembly also includes a lower sealing ring 19 and a lower guide pin 18 disposed between the lower suspension seat 23 and the electrode body 13.

[0076] In one embodiment, refer to Figure 1 As shown, the wire passage space of the electrode body 13 is filled with silicone grease. The silicone grease can be injected through the injection hole opened on the electrode body 13, and the injection hole is sealed by the sealing bolt 14.

[0077] In one embodiment, refer to Figure 1 As shown, the electrode provided in this embodiment of the invention may further include a conductive ring 21 and a fixing screw 20; the conductive ring 21 is disposed between the electrode body 13 and the lower insulating ring 22; or the conductive ring 21 is disposed between the electrode body 13 and the upper insulating ring 8; the conductive ring 21 is electrically connected to the electrode body 13. (Refer to...) Figure 1 and Figure 2 As shown, at least one upper cable conductor 31 passes through the first wire hole and the wire passage space and is connected to the conductive ring 21. The conductive ring 21 enables the upper multi-core cable 1 to be energized to the electrode. A fixing screw 20 is used to fix the upper cable conductor 31 to the conductive ring 21.

[0078] In one embodiment, refer to Figure 1 As shown, the electrode provided in this embodiment of the invention further includes: an upper sliding ring 11 and a lower sliding ring 17; an upper connecting screw 12 is provided on the upper sliding ring 11, and a lower connecting screw 16 is provided on the lower sliding ring 17; the upper suspension seat 7 is connected to the electrode body 13 through the upper sliding ring 11, and the lower suspension seat 23 is connected to the electrode body 13 through the lower sliding ring 17.

[0079] This invention also provides a multi-electrode magnetic detection system, comprising multiple downhole formation current injection electrodes connected in series as described above, and a magnetic detection device.

[0080] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A downhole formation current injection electrode, characterized in that, include: The upper connection assembly, electrode body, and lower connection assembly are connected sequentially from top to bottom, along with the upper multi-core cable and the lower multi-core cable; The upper multi-core cable passes through multiple holes that are isolated from each other in the upper connecting assembly, and the lower multi-core cable passes through multiple holes that are isolated from each other in the lower connecting assembly; The upper multi-core cable passes through the wire passage space provided in the electrode body and is connected to the lower multi-core cable; The upper multi-core cable includes multiple upper cable conductors, and at least one upper cable conductor is connected to the electrode body; The space between the wires is filled with an insulating medium.

2. The electrode as described in claim 1, characterized in that, The plurality of holes in the upper connection assembly that are isolated from each other include a first wire-passing hole; the plurality of holes in the lower connection assembly that are isolated from each other include a second wire-passing hole; The lower multi-core cable includes multiple lower cable conductors; At least one upper cable conductor passes through the first cable pass-through hole and the cable pass-through space, and is connected to at least one lower cable conductor passing through the second cable pass-through hole.

3. The electrode as described in claim 2, characterized in that, The upper connecting assembly contains a plurality of holes that are isolated from each other, including a first tapered hole; the lower connecting assembly contains a plurality of holes that are interconnected with each other, including a second tapered hole. The upper multi-core cable also includes multiple upper cable load-bearing steel wires; the lower multi-core cable also includes multiple lower cable load-bearing steel wires; The upper cable load-bearing wire passes through the first conical hole, and the lower cable load-bearing wire passes through the second conical hole. At least one upper cable load-bearing wire and at least one lower cable load-bearing wire are connected to each other.

4. The electrode as described in claim 3, characterized in that, The at least one upper cable load-bearing steel wire and the at least one lower cable load-bearing steel wire are connected to each other, including: At least one steel wire connecting conductor is provided in the wire passage space; One end of the steel wire connecting conductor is connected to the upper cable load-bearing steel wire, and the other end of the steel wire connecting conductor is connected to the lower cable load-bearing steel wire.

5. The electrode as described in claim 4, characterized in that, The upper connection assembly includes: an upper suspension head, a plurality of first conical sleeves and second conical sleeves; The upper suspension head is provided with a plurality of first wire-passing holes and a plurality of first conical holes; The first conical sleeve and the second conical sleeve are respectively disposed in the first conical hole; the second conical sleeve is disposed in the space formed by the plurality of first conical sleeves; The lower connection assembly includes: a lower suspension head, multiple third cone sleeves, and a fourth cone sleeve; The lower suspension head is provided with a plurality of second wire-passing holes and a plurality of second conical holes; The third and fourth conical sleeves are respectively disposed in the second conical hole; the fourth conical sleeve is disposed in the space formed by the multiple third conical sleeves.

6. The electrode as described in claim 5, characterized in that, The upper connection assembly further includes: an upper suspension seat and an upper conical spring; The upper suspension seat is sleeved on the outside of the upper suspension head; one end of the upper suspension seat is connected to the conical spring, and the other end of the upper suspension seat is connected to the electrode body; One end of the upper conical spring is sleeved on the outside of the upper multi-core cable, and the other end of the upper conical spring is sleeved on the outside of the upper suspension seat; The lower connection assembly further includes: a lower suspension seat and a lower conical spring; The lower suspension seat is sleeved on the outside of the lower suspension head; one end of the lower suspension seat is connected to the conical spring, and the other end of the lower suspension seat is connected to the electrode body; One end of the lower conical spring is sleeved on the outside of the lower multi-core cable, and the other end of the lower conical spring is sleeved on the outside of the lower suspension seat.

7. The electrode as claimed in claim 6, characterized in that, The upper connection assembly further includes: an upper conical rubber sleeve; The upper conical rubber sleeve is disposed between the upper suspension seat and the upper suspension head; one end of the upper conical rubber sleeve is sleeved on the outside of the upper multi-core cable, and the other end of the upper conical rubber sleeve is sleeved on the outside of the upper suspension head; The lower connection assembly further includes: a lower tapered rubber sleeve; The lower conical rubber sleeve is disposed between the lower suspension seat and the lower suspension head; one end of the lower conical rubber sleeve is sleeved on the outside of the lower multi-core cable, and the other end of the lower conical rubber sleeve is sleeved on the outside of the lower suspension head.

8. The electrode as claimed in claim 7, characterized in that, The upper connection assembly further includes: an upper insulating ring. The upper insulating ring is disposed between the upper suspension head and the electrode body; The lower connection assembly further includes: a lower insulating ring; The lower insulating ring is disposed between the lower suspension head and the electrode body.

9. The electrode according to any one of claims 1-8, characterized in that, The insulating medium is silicone grease.

10. The electrode as claimed in claim 9, characterized in that, It also includes conductive rings; The conductive ring is disposed between the electrode body and the lower insulating ring; or the conductive ring is disposed between the electrode body and the upper insulating ring; the conductive ring is electrically connected to the electrode body; The conductive ring is connected to at least one of the upper cable conductors through the first wire-passing hole and the wire-passing space.

11. A multi-electrode magnetic detection system, characterized in that, It includes multiple electrodes and magnetic detection devices as described in any one of claims 1-10.

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