Drilling power cable for oil platform

Abstract

The invention provides a drilling power cable for an oil platform, and belongs to the technical field of cables, the drilling power cable for the oil platform provided by the invention comprises a plurality of conductors, an insulating layer is arranged outside each conductor, the same shielding layer is arranged outside the plurality of insulating layers, and a filling layer is arranged between the interior of the shielding layer and the insulating layer; a sheath layer is arranged outside the shielding layer, the sheath layer comprises an inner protection layer and an outer protection layer, a plurality of groups of anti-distortion components are arranged between the inner protection layer and the outer protection layer at intervals, the anti-distortion components are used for generating acting force in opposite directions for confrontation when the outer protection layer is distorted, and the anti-distortion components are mutually connected. According to the invention, the structural strength of the sheath layer and the distortion resistance of the cable are significantly enhanced, the stability and safety of the cable in power transmission in a complex marine environment are guaranteed, and the risk of power transmission failure and cable damage caused by distortion is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of cables, and more particularly relates to a drilling power cable for oil platforms. Background Art

[0002] With the acceleration of development in the Far East and offshore oil and gas fields, oil production activities are facing extreme weather and complex marine environments, driving increasing demands for oil platforms to operate in extremely cold environments. Their safe and stable operation is crucial for ensuring energy supply and national energy security. As a key component for power transmission and data communication on oil platforms, the performance and quality of power cables used in top drives on oil platforms directly impact the stability and safety of the entire platform.

[0003] The top drive, or top-driven drilling rig, is a major cutting-edge technology and equipment in today's oil drilling industry, essential for deep and complex well construction. The power cable and its associated components for oil platform top drives are specialized transmission lines that provide electrical energy to the top drive transmission system. They connect the control console and the top drive, serving as the primary power element for the entire top drive system.

[0004] Currently available drilling power cables include a conductor, an insulation layer, a shielding layer, and a sheath layer, which are arranged in sequence from the inside out. The sheath layer needs to withstand seawater corrosion, mechanical damage, and seawater pressure underwater. Drilling power cables operate underwater for a long time and are susceptible to distortion in non-length directions (such as circumferential directions or other irregular directions) caused by the above or other factors, affecting power transmission and cable safety. Summary of the Invention

[0005] The purpose of the present invention is to provide a drilling power cable for oil platforms to solve the technical problem in the prior art that drilling power cables are easily twisted in non-length directions due to various factors during long-term underwater operations, thereby affecting power transmission and cable safety.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a drilling power cable for an oil platform, comprising multiple conductors, each of which is provided with an insulating layer, the same shielding layer is provided outside the multiple insulating layers, and a filling layer is provided inside the shielding layer and between the insulating layer; a sheath layer is provided outside the shielding layer, and the sheath layer includes an inner sheath and an outer sheath, and multiple groups of anti-twist components are arranged between the inner sheath and the outer sheath, and the anti-twist components are used to generate a force in the opposite direction to resist when the outer sheath is twisted, and each group of anti-twist components are connected to each other.

[0007] In combination with the above technical solution, in a possible implementation method, the filling layer includes a plurality of filling bars, and the plurality of conductors are twisted together after being sleeved with the insulating layer. The filling bars are twisted at intervals between adjacent conductors, and the outer side of each filling bar is tightly pressed against the inner side of the shielding layer.

[0008] In combination with the above technical solution, in a possible implementation, the anti-twisting component includes a first ring, a second ring, a tensile elastic rope and a connecting piece, the first ring and the second ring are both arranged on the inner protective layer, the tensile elastic rope has multiple parts and is connected between the first ring and the second ring; the connecting piece is used to connect the first ring and the second ring on the adjacent anti-twisting component.

[0009] In combination with the above technical solution, in a possible implementation method, a positioning block is provided in the middle position of each tensile elastic rope, and a cavity is provided inside the positioning block. A U-shaped metal shrapnel is provided in the cavity, and the closed end of the metal shrapnel is fixed to the bottom of the cavity, and the open end of the metal shrapnel is set upward; the tensile elastic rope is divided into two sections by its middle part, and the ends of the two sections of the tensile elastic rope are respectively connected to the two sides of the open end of the metal shrapnel.

[0010] In combination with the above technical solution, in a possible implementation method, the bottom end of the metal spring is provided with a pointed edge for inserting into the inner protective layer, and the pointed edge passes through the positioning block and is fixed thereto; after all the pointed edges are inserted into the inner protective layer, the adjacent positioning blocks are fitted together to form a ring structure.

[0011] In combination with the above technical solution, in a possible implementation method, the metal shrapnel is provided with perforations on both sides, and the end of the tensile elastic rope passes through the perforations and is connected to the side of the metal shrapnel farther away; an elastic part is connected to the inner side of the open end of the metal shrapnel.

[0012] In combination with the above technical solution, in a possible implementation method, the two perforations on the same metal dome are arranged opposite to each other; the two sections of the tensile elastic rope each include an elastic part and a rigid part, one end of the elastic part is used to connect the first ring or the second ring, and the other end extends to the perforation; the rigid part is located inside the metal dome and is arranged in a bent shape, one end of the rigid part is connected to the elastic part through the perforation, and the other end is bent and extended to the far side of the metal dome for connection; the rigid parts on the two sections of the tensile elastic rope are respectively located on both sides of the perforation.

[0013] In combination with the above technical solution, in a possible implementation manner, a gap is left between the bending part of the rigid portion and the inner side wall that is not connected to the metal spring.

[0014] In combination with the above technical solution, in a possible implementation method, the connecting part includes a plug-in ring and a plug-in slot, the plug-in ring is coaxially fixed on one of the end faces of the first ring and the second ring, and the plug-in slot is coaxially opened on the other end face, and the plug-in ring and the plug-in slot are plugged into each other.

[0015] In combination with the above technical solution, in a possible implementation, the plug-in ring and the plug-in slot are provided with an arc-shaped limiting portion, and the length direction of the arc-shaped limiting portion is parallel to the axial direction of the plug-in ring.

[0016] The beneficial effects of the drilling power cable for oil platforms provided by the present invention are: compared with the existing technology, the present invention can effectively improve the insulation performance and electromagnetic shielding capability of the cable by arranging multiple insulating layers, shielding layers and filling layers outside the conductors; and the anti-twisting component between the inner sheath and the outer sheath in the sheath layer can generate an opposing force in the opposite direction when the outer sheath is twisted, thereby providing anti-twisting protection for the shielding layer, insulating layer and conductor inside the cable, significantly enhancing the structural strength of the sheath layer and the cable's anti-twisting deformation capability, ensuring the stability and safety of the cable in transmitting electricity in a complex marine environment, and reducing the risk of power transmission failures and cable damage caused by twisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A cross-sectional view of a drilling power cable for an oil platform provided by an embodiment of the present invention; Figure 2 A cross-sectional view of a sheath layer and an anti-twist assembly provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an anti-twist assembly provided by an embodiment of the present invention when not installed; Figure 4 A vertical cross-sectional view of a metal dome provided in an embodiment of the present invention; Figure 5 A transverse cross-sectional view of the elastic portion and the rigid portion provided in an embodiment of the present invention; Figure 6 A cross-sectional view of a connector according to an embodiment of the present invention.

[0019] Among them, the reference numerals in the figures are as follows: 1. Conductor; 2. Insulation layer; 21. Insulation protective layer; 3. Shielding layer; 4. Filling layer; 41. Filling strip; 5. Jacket layer; 51. Inner sheath; 52. Outer sheath; 6. Anti-twist assembly; 61. First ring; 62. Second ring; 63. Tensile elastic rope; 631. Elastic part; 632. Rigid part; 64. Connector; 641. Plug ring; 642. Plug slot; 643. Arc-shaped limit part; 65. Positioning block; 651. Cavity; 66. Metal shrapnel; 661. Sharp edge; 662. Perforation; 663. Elastic part. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the described embodiments are only part of the embodiments of this application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0021] It should be further explained that the drawings and implementation methods of the present invention mainly describe the concept of the present invention. Based on this concept, the specific forms and settings of some connection relationships and positional relationships may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a familiar manner.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, and "several" means one or more, unless otherwise specifically defined.

[0023] The drilling power cable for oil platforms provided by the present invention will now be described.

[0024] like Figures 1 to 3As shown, one embodiment of the present invention provides a drilling power cable for an oil platform, comprising a plurality of conductors 1, each conductor 1 being provided with an insulating layer 2 on the outside, a same shielding layer 3 being provided on the outside of the plurality of insulating layers 2, a filling layer 4 being provided between the inside of the shielding layer 3 and the insulating layer 2; a sheath layer 5 being provided on the outside of the shielding layer 3, the sheath layer 5 comprising an inner sheath 51 and an outer sheath 52, a plurality of groups of anti-twist components 6 being provided between the inner sheath 51 and the outer sheath 52, the anti-twist components 6 being used to generate a force in the opposite direction to resist when the outer sheath 52 is twisted, and each group of anti-twist components 6 are connected to each other.

[0025] Furthermore, an insulating protective layer 21 is provided outside each insulating layer 2 to further protect the insulating layer 2 and the conductors 1. Multiple conductors 1 are twisted together after being sheathed with the insulating layer 2 and the insulating protective layer 21, and then the entire cable is wrapped with two layers of high-molecular polyester film to ensure a rounded and stable structure of the cable core and prevent the shielding layer 3 from damaging the cable core during the braiding of the metal wires.

[0026] Compared with the prior art, the drilling power cable for oil platforms provided in this embodiment can effectively improve the insulation performance and electromagnetic shielding capability of the cable by arranging an insulating layer 2, a shielding layer 3 and a filling layer 4 outside multiple conductors 1; and the anti-twist component 6 between the inner protective layer 51 and the outer protective layer 52 in the sheath layer 5 can generate an opposing force in the opposite direction when the outer protective layer 52 is twisted, thereby providing anti-twist protection for the shielding layer 3, the insulating layer 2 and the conductor 1 inside the cable, significantly enhancing the structural strength of the sheath layer 5 and the anti-twist deformation capability of the cable, ensuring the stability and safety of the cable in transmitting electricity in a complex marine environment, and reducing the risk of power transmission failures and cable damage caused by twisting; and when the anti-twist component 6 is installed, the inner protective layer 51 can protect the internal structure of the cable, thereby improving the installation convenience of the anti-twist component 6.

[0027] like Figure 1 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: The filling layer 4 includes a plurality of filling bars 41 . The filling bars 41 are twisted at intervals between adjacent conductors 1 , and the outer side of each filling bar 41 is pressed against the inner side of the shielding layer 3 .

[0028] The filling strips 41 are twisted at intervals between adjacent conductors 1 and the outer sides are pressed against the inner side of the shielding layer 3, making the internal structure of the cable more compact. After the conductors 1 are twisted, the gaps are filled with the filling strips 41 to evenly distribute the internal stress of the cable, avoiding the concentrated distortion caused by the gaps between the conductors 1, further improving the overall anti-distortion performance of the cable, and enhancing the stability of the cable structure.

[0029] like Figure 3 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: The anti-twist assembly 6 includes a first ring 61, a second ring 62, a tensile elastic rope 63 and a connector 64. The first ring 61 and the second ring 62 are both sleeved on the inner protective layer 51. The tensile elastic rope 63 has multiple parts and is connected between the first ring 61 and the second ring 62; the connector 64 is used to connect the first ring 61 and the second ring 62 on the adjacent anti-twist assembly 6.

[0030] Specifically, the outer sheath 52 is extruded during cable production, and both the inner sheath 51 and the outer sheath 52 are made of polyurethane elastic material. The outer sheath 52 fills the space between adjacent tensile elastic ropes 63 to cooperate with the tensile elastic ropes 63 to synchronously resist twisting, and the tensile elastic ropes 63 are always in a taut state.

[0031] When the outer sheath 52 is twisted, the tensile elastic rope 63 can generate a reverse force through its own elastic deformation. Multiple groups of anti-twist components 6 form a linkage structure through the connector 64 to cooperate in resisting twisting, thereby improving the integrity and effectiveness of the cable's anti-twist performance and enhancing the cable's toughness and recovery ability when subjected to non-length direction forces.

[0032] like Figures 3 to 5 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: A positioning block 65 is provided in the middle of each tensile elastic rope 63. The positioning block 65 has a cavity 651 inside. A U-shaped metal spring 66 is provided in the cavity 651. The closed end of the metal spring 66 is fixed to the bottom of the cavity 651, and the open end of the metal spring 66 is set upward; the tensile elastic rope 63 is divided into two sections at its middle part. The ends of the two sections of the tensile elastic rope 63 are respectively inserted into the cavity 651 and connected to the two sides of the open end of the metal spring 66.

[0033] Specifically, one positioning block 65 may have multiple cavities 651 , that is, one positioning block 65 may be used to connect multiple tensile elastic ropes 63 .

[0034] The metal spring piece 66 can undergo elastic deformation when the tensile elastic rope 63 is subjected to force, thereby increasing the elastic buffering capacity of the anti-twist component 6. The elastic restoring force of the metal spring piece 66 assists the tensile elastic rope 63 in resisting twisting. At the same time, the positioning block 65 can fix the middle position of the tensile elastic rope 63, so that the tensile elastic rope 63 is subjected to more uniform force, thereby improving the anti-twist effect.

[0035] like Figure 3 and Figure 5 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: The bottom end of the metal spring 66 is provided with a sharp edge 661 for inserting into the inner protective layer 51. The sharp edge 661 passes through the positioning block 65 and is fixed thereto. After all the sharp edges 661 are inserted into the inner protective layer 51, adjacent positioning blocks 65 fit together to form an annular structure.

[0036] Furthermore, in this embodiment, slots and inserting blocks may be provided on the side walls of adjacent positioning blocks 65 that are in contact with each other. The plug-in fit of the slots and the inserting blocks can further improve the connection stability between adjacent positioning blocks 65 .

[0037] When installing the anti-twisting component 6, the first ring 61 and the second ring 62 are sequentially passed through the inner protective layer 51, and the adjacent first ring 61 and the second ring 62 are fixed by the connecting piece 64. A circle of positioning blocks 65 is pressed inward manually or by machine so that the pointed edge 661 is inserted into the inner protective layer 51. Finally, a circle of positioning blocks 65 forms a stable annular structure, which further enhances the anti-twisting effect. At the same time, the radial displacement of the positioning blocks 65 can further tighten the tensile elastic rope 63 to improve the subsequent stability of the outer protective layer 52 during extrusion, as well as to improve the subsequent anti-twisting effect.

[0038] like Figures 4 and 5 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: The metal spring 66 has through-holes 662 on both sides. The ends of the tension-resistant elastic rope 63 pass through the through-holes 662 and are connected to the side of the metal spring 66 at the far side. The inner side of the open end of the metal spring 66 is connected to an elastic member 663 .

[0039] Specifically, in this embodiment, the elastic member 663 may be a spring, a compression spring or an elastic block.

[0040] The tensile elastic cord 63 is connected to the side of the metal spring 66 that is farther away. When the tensile elastic cord 63 is subjected to force, the metal spring 66 can be retracted inward to cooperate with the elastic member 663. This not only facilitates the installation of the elastic member 663, but also further increases the elasticity of the metal spring 66, providing a stronger restoring force when the cable is twisted, thereby improving the anti-twisting performance.

[0041] like Figures 4 and 5 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: The two through-holes 662 on the same metal dome 66 are arranged opposite each other; the two sections of the tensile elastic rope 63 each include an elastic portion 631 and a rigid portion 632. One end of the elastic portion 631 is used to connect to the first ring 61 or the second ring 62, and the other end extends to the through-hole 662. The rigid portion 632 is located inside the metal dome 66 and is arranged in a bent shape. One end of the rigid portion 632 is connected to the elastic portion 631 through the through-hole 662, and the other end is bent and extended to connect to the side of the metal dome 66 farther away. The rigid portions 632 on the two sections of the tensile elastic rope 63 are respectively located on both sides of the through-hole 662.

[0042] Specifically, the rigid portion 632 can be made of a rigid metal or non-metal material.

[0043] The elastic portion 631 provides basic elastic buffering. When subjected to force, the elastic portion 631 drives the metal spring 66 to deform through the rigid portion 632, thereby improving the force stability of the metal spring 66; and the bending setting of the rigid portion 632 enables the two through-holes 662 on the metal spring 66 to be processed in a facing direction, thereby improving the processing convenience of the metal spring 66.

[0044] like Figure 5 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: A gap is left between the bent portion of the rigid portion 632 and the inner sidewall of the metal spring 66 that is not connected thereto.

[0045] The gap between the rigid portion 632 and the non-connected inner wall of the metal dome 66 is the deformable space of the metal dome 66 , thereby controlling the deformation of the metal dome 66 and extending the service life of the metal dome 66 .

[0046] like Figure 3 and Figure 6 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: The connecting member 64 includes a plug-in ring 641 and a plug-in groove 642. The plug-in ring 641 is coaxially fixed to one end surface of the first ring 61 and the second ring 62. The plug-in groove 642 is coaxially opened on the other end surface. The plug-in ring 641 and the plug-in groove 642 are plugged into each other.

[0047] The cooperation between the plug ring 641 and the plug slot 642 facilitates the installation of the anti-twist component 6, and at the same time can provide a reliable mechanical connection, ensure the effective transmission of force between adjacent anti-twist components 6, and enhance the integrity and reliability of the cable anti-twist structure.

[0048] like Figure 3 and Figure 6 As shown, the present invention provides a specific implementation method based on the above implementation method as follows: An arc-shaped limiting portion 643 is formed on the plug-in ring 641 and the plug-in groove 642 . The length direction of the arc-shaped limiting portion 643 is parallel to the axial direction of the plug-in ring 641 .

[0049] The setting of the arc-shaped limit portion 643 can prevent the plug-in ring 641 and the plug-in slot 642 from rotating relative to each other, and at the same time ensure that the anti-twist component 6 maintains the correct connection direction during the cable twisting process, so that the anti-twist force always acts in the predetermined direction, thereby improving the accuracy and effectiveness of the anti-twist component 6 in resisting twisting, and further enhancing the anti-twist performance of the cable.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. Drilling power cable for oil platform, characterized by: The invention comprises a plurality of conductors (1), each of which is provided with an insulating layer (2) outside, a same shielding layer (3) outside the plurality of insulating layers (2), a filling layer (4) being provided between the shielding layer (3) and the insulating layer (2); a sheath layer (5) being provided outside the shielding layer (3), the sheath layer (5) comprising an inner sheath (51) and an outer sheath (52), a plurality of groups of anti-twist components (6) being provided at intervals between the inner sheath (51) and the outer sheath (52), the anti-twist components (6) being used to generate a force in an opposite direction to resist when the outer sheath (52) is twisted, and each group of the anti-twist components (6) are connected to each other.

2. The oil platform drilling power cable according to claim 1, characterized in that: The filling layer (4) comprises a plurality of filling strips (41), and the plurality of conductors (1) are twisted together after being sheathed with the insulating layer (2). The filling strips (41) are twisted at intervals between adjacent conductors (1), and the outer side of each filling strip (41) is tightly pressed against the inner side of the shielding layer (3).

3. The oil platform drilling power cable according to claim 1, characterized in that: The anti-twist assembly (6) comprises a first ring (61), a second ring (62), a tensile elastic rope (63) and a connector (64); the first ring (61) and the second ring (62) are both sleeved on the inner protective layer (51); the tensile elastic rope (63) has a plurality of rings and is connected between the first ring (61) and the second ring (62); the connector (64) is used to connect the first ring (61) and the second ring (62) on the adjacent anti-twist assembly (6).

4. The oil platform drilling power cable according to claim 3, characterized in that: A positioning block (65) is provided at the middle position of each tensile elastic rope (63), and a cavity (651) is provided inside the positioning block (65). A U-shaped metal shrapnel (66) is provided in the cavity (651), and the closed end of the metal shrapnel (66) is fixed to the bottom of the cavity (651), and the open end of the metal shrapnel (66) is arranged upward; the tensile elastic rope (63) is divided into two sections from its middle part, and the ends of the two sections of the tensile elastic rope (63) are respectively connected to the two sides of the open end of the metal shrapnel (66).

5. The oil platform drilling power cable according to claim 4, characterized in that: The bottom end of the metal spring (66) is provided with a sharp edge (661) for inserting into the inner protective layer (51), and the sharp edge (661) passes through the positioning block (65) and is fixed thereto; after all the sharp edges (661) are inserted into the inner protective layer (51), adjacent positioning blocks (65) are fitted together to form an annular structure.

6. The oil platform drilling power cable according to claim 4, characterized in that: The metal shrapnel (66) is provided with perforations (662) on both sides, and the end of the tensile elastic rope (63) passes through the perforations (662) and is connected to the side of the metal shrapnel (66) at a distance; the inner side of the open end of the metal shrapnel (66) is connected to an elastic member (663).

7. The oil platform drilling power cable according to claim 6, characterized in that: The two through-holes (662) on the same metal shrapnel (66) are arranged opposite to each other; the two sections of the tensile elastic rope (63) each include an elastic portion (631) and a rigid portion (632), one end of the elastic portion (631) is used to connect to the first ring (61) or the second ring (62), and the other end extends to the through-hole (662); the rigid portion (632) is located inside the metal shrapnel (66) and is arranged in a bent shape, one end of the rigid portion (632) is connected to the elastic portion (631) through the through-hole (662), and the other end is bent and extended to connect to the side of the metal shrapnel (66) at a distance; the rigid portions (632) on the two sections of the tensile elastic rope (63) are respectively located on both sides of the through-hole (662).

8. The oil platform drilling power cable according to claim 7, characterized in that: A gap is left between the bending portion of the rigid portion (632) and the non-connected inner side wall of the metal spring (66).

9. The oil platform drilling power cable according to claim 3, characterized in that: The connecting member (64) comprises a plug-in ring (641) and a plug-in slot (642); the plug-in ring (641) is coaxially fixed to one end face of the first sleeve ring (61) and the second sleeve ring (62); the plug-in slot (642) is coaxially opened on the other end face; the plug-in ring (641) and the plug-in slot (642) are plugged into and matched with each other.

10. The oil platform drilling power cable according to claim 9, characterized in that: The plug-in ring (641) and the plug-in slot (642) are provided with an arc-shaped limiting portion (643), and the length direction of the arc-shaped limiting portion (643) is parallel to the axial direction of the plug-in ring (641).

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