Drilling power cable for oil platforms

Abstract

The application 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 comprises a plurality of conductors, each of which is provided with an insulating layer outside, a shielding layer outside the plurality of insulating layers, and a filling layer between the shielding layer and the insulating layer; and the shielding layer is provided with a sheath layer outside, the sheath layer comprises an inner sheath layer and an outer sheath layer, a plurality of anti-twist assemblies are arranged between the inner sheath layer and the outer sheath layer, the anti-twist assemblies are used for generating counteracting forces in the opposite direction when the outer sheath layer is twisted, and each group of anti-twist assemblies is connected to each other. The application significantly enhances the structural strength of the sheath layer and the anti-twist deformation capacity of the cable, guarantees the stability and safety of power transmission of the cable in a complex marine environment, and reduces the risk of power transmission failure and cable damage caused by twisting.

Description

Technical Field

[0001] This invention belongs to the technical field of cables, and more specifically, relates to a drilling power cable for oil platforms. Background Technology

[0002] With the accelerated development of the Far East and marine areas, oil extraction activities face extreme weather and complex marine environments, leading to increasing demands on oil platforms to operate in extremely cold conditions. 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 the top drive power cable directly affect the stability and safety of the entire platform.

[0003] Top drive systems, also known as top-driven drilling rigs, represent a significant cutting-edge technology and equipment in modern oil drilling, and are essential for deep and complex well operations. The power cable and its associated equipment for the top drive of an oil platform are dedicated transmission lines that provide electrical power to the top drive system. They serve as the link between the control console and the top drive, acting as the primary power element for the entire top drive system.

[0004] Existing drilling power cables consist of a conductor, an insulation layer, a shielding layer, and a sheath layer arranged sequentially from the inside out. The sheath layer needs to withstand seawater corrosion, mechanical damage, and seawater pressure underwater. Drilling power cables operate underwater for extended periods and are susceptible to twisting in non-length directions (such as circumferential 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 this invention is to provide a drilling power cable for oil platforms, in order to solve the technical problem that existing drilling power cables are prone to twisting in non-length directions due to various factors during long-term underwater operations, which affects power transmission and cable safety.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a drilling power cable for oil platforms is provided, comprising multiple conductors, each conductor having an insulation layer, and a common shielding layer being provided outside the multiple insulation layers. A filling layer is provided between the shielding layer and the insulation layer. A sheathing layer is provided outside the shielding layer, the sheathing layer comprising an inner sheath and an outer sheath, and multiple sets of anti-torsion components are spaced apart between the inner and outer sheaths. The anti-torsion components are used to generate a counterforce when the outer sheath is twisted, and each set of anti-torsion components is interconnected.

[0007] In one possible implementation, based on the above technical solutions, the filling layer includes multiple filling strips, which are formed by twisting the multiple conductors together after the insulating layer is applied. The filling strips are twisted at intervals between adjacent conductors, and the outer side of each filling strip is pressed against the inner side of the shielding layer.

[0008] In one possible implementation, based on the above technical solutions, the anti-torsion component includes a first collar, a second collar, a tensile elastic rope, and a connector. The first collar and the second collar are both sleeved on the inner protective layer. The tensile elastic rope has multiple sections and is connected between the first collar and the second collar. The connector is used to connect the first collar and the second collar on the adjacent anti-torsion component.

[0009] In one possible implementation, based on the above technical solutions, a positioning block is provided at the middle of each tensile elastic rope. The positioning block has a cavity inside, and a U-shaped metal spring is provided inside the cavity. The closed end of the metal spring is fixed to the bottom of the cavity, and the open end of the metal spring faces upward. The tensile elastic rope is divided into two sections from its middle, and the ends of the two sections are respectively connected to the two sides of the open end of the metal spring.

[0010] In one possible implementation, based on the above technical solutions, the bottom end of the metal spring is provided with a pointed edge for inserting into the inner protective layer. The pointed edge penetrates the positioning block and is fixed thereto. After all the pointed edges are inserted into the inner protective layer, adjacent positioning blocks fit together to form a ring structure.

[0011] In one possible implementation, based on the above technical solutions, the metal spring sheet has perforations on both sides, and the end of the tensile elastic rope passes through the perforations and connects to the opposite side of the metal spring sheet; an elastic element is connected to the inner side of the open end of the metal spring sheet.

[0012] In one possible implementation, based on the above technical solutions, the two perforations on the same metal spring are arranged opposite each other; both sections of the tensile elastic rope include an elastic part and a rigid part, one end of the elastic part is used to connect to the first collar or the second collar, and the other end extends to the perforation; the rigid part is located inside the metal spring and is bent, one end of the rigid part is connected to the elastic part through the perforation, and the other end is bent and extends to the side of the distant metal spring 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 one possible implementation, based on the above technical solutions, a gap is left between the bent part of the rigid part and the inner sidewall of the metal spring sheet that is not connected.

[0014] In one possible implementation, based on the above technical solutions, the connector includes a plug ring and a plug groove. The plug ring is coaxially fixed to one end face of the first sleeve ring and the second sleeve ring, and the plug groove is coaxially formed on the other end face. The plug ring and the plug groove are mutually plugged into each other.

[0015] In one possible implementation, based on the above technical solutions, the insertion ring and the insertion groove have arc-shaped limiting portions, the length direction of which is parallel to the axial direction of the insertion ring.

[0016] The beneficial effects of the drilling power cable for oil platforms provided by this invention are as follows: Compared with the prior art, this invention can effectively improve the insulation performance and electromagnetic shielding capability of the cable by setting multiple insulation layers, shielding layers and filling layers outside the conductors; and the anti-torsion component between the inner and outer sheaths in the sheath layer can generate a counterforce when the outer sheath is tortuous, thereby providing anti-torsion protection for the shielding layer, insulation layer and conductor inside the cable, significantly enhancing the structural strength of the sheath layer and the cable's resistance to torsion deformation, ensuring the stability and safety of power transmission in complex marine environments, and reducing the risk of power transmission failure and cable damage caused by torsion. Attached Figure Description

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

[0018] Figure 1 A cross-sectional view of a drilling power cable for an oil platform provided in an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of the sheath layer and anti-torsion component provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the anti-torsion component provided in this embodiment of the invention when it is not installed;

[0021] Figure 4 A vertical sectional view of the metal spring sheet provided in an embodiment of the present invention;

[0022] Figure 5 A transverse sectional view of the elastic part and the rigid part provided in an embodiment of the present invention;

[0023] Figure 6 This is a cross-sectional view of a connector provided in an embodiment of the present invention.

[0024] The labels for the attached figures are as follows:

[0025] 1. Conductor; 2. Insulation layer; 21. Insulation protection layer; 3. Shielding layer; 4. Filler layer; 41. Filler strip; 5. Sheath layer; 51. Inner sheath; 52. Outer sheath; 6. Anti-torsion component; 61. First ring; 62. Second ring; 63. Tensile elastic rope; 631. Elastic part; 632. Rigid part; 64. Connector; 641. Insertion ring; 642. Insertion groove; 643. Arc-shaped limiting part; 65. Positioning block; 651. Cavity; 66. Metal spring; 661. Sharp edge; 662. Perforation; 663. Elastic element. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships and positional relationships may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0028] 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 number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0029] The drilling power cable for oil platforms provided by this invention will now be described.

[0030] like Figures 1 to 3As shown, one embodiment of the present invention provides a drilling power cable for an oil platform, comprising multiple conductors 1, each conductor 1 having an insulation layer 2, and the same shielding layer 3 being disposed outside the multiple insulation layers 2. A filling layer 4 is disposed between the shielding layer 3 and the insulation layer 2. A sheath layer 5 is disposed outside the shielding layer 3, the sheath layer 5 comprising an inner sheath 51 and an outer sheath 52, and multiple sets of anti-torsion components 6 are disposed at intervals between the inner sheath 51 and the outer sheath 52. The anti-torsion components 6 are used to generate a counterforce when the outer sheath 52 is twisted, and each set of anti-torsion components 6 is interconnected.

[0031] Furthermore, each insulation layer 2 is provided with an insulating protective layer 21 to further protect the insulation layer 2 and the conductor 1. Multiple conductors 1 are twisted together after being fitted with insulation layers 2 and insulating protective layers 21, and then wrapped with two layers of high-molecular polyester film to make the cable core round and structurally stable, and to prevent the shielding layer 3 from damaging the cable core when braiding the metal wires.

[0032] 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 setting multiple insulation layers 2, shielding layers 3 and filling layers 4 outside the conductors 1. The anti-torsion component 6 between the inner sheath 51 and the outer sheath 52 in the sheath layer 5 can generate a counterforce when the outer sheath 52 is twisted, thereby providing anti-torsion protection for the shielding layer 3, insulation layer 2 and conductor 1 inside the cable. This significantly enhances the structural strength of the sheath layer 5 and the cable's resistance to torsion deformation, ensuring the stability and safety of power transmission in complex marine environments and reducing the risk of power transmission failure and cable damage caused by torsion. Moreover, during installation, the inner sheath 51 can protect the internal structure of the cable, improving the ease of installation of the anti-torsion component 6.

[0033] like Figure 1 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0034] The filling layer 4 includes multiple filling strips 41, which are twisted together at intervals between adjacent conductors 1, and the outer side of each filling strip 41 is pressed against the inner side of the shielding layer 3.

[0035] The filler strip 41 is intermittently twisted between adjacent conductors 1 and its outer side is 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 by the filler strip 41, which evenly distributes the internal stress of the cable and avoids the torsion concentration caused by the gaps between conductors 1, further improving the overall anti-torsion performance of the cable and enhancing the stability of the cable structure.

[0036] like Figure 3As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0037] The anti-torsion component 6 includes a first collar 61, a second collar 62, a tensile elastic rope 63, and a connector 64. The first collar 61 and the second collar 62 are both sleeved on the inner protective layer 51. The tensile elastic rope 63 has multiple parts and is connected between the first collar 61 and the second collar 62. The connector 64 is used to connect the first collar 61 and the second collar 62 on the adjacent anti-torsion component 6.

[0038] 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 spaces between adjacent tensile elastic ropes 63 to cooperate with the tensile elastic ropes 63 in synchronous anti-torsion, and the tensile elastic ropes 63 are always in a taut state.

[0039] When the outer sheath 52 is twisted, the tensile elastic rope 63 can generate a counterforce through its own elastic deformation. Multiple sets of anti-twist components 6 form a linkage structure through the connector 64 to work together to resist the twist, improve the overall and effective anti-twist of the cable, and enhance the cable's toughness and recovery ability when subjected to non-length direction forces.

[0040] like Figures 3 to 5 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0041] Each tensile elastic rope 63 has a positioning block 65 in the middle, and the positioning block 65 has a cavity 651 inside. A U-shaped metal spring piece 66 is installed in the cavity 651. The closed end of the metal spring piece 66 is fixed to the bottom of the cavity 651, and the open end of the metal spring piece 66 is facing upward. The tensile elastic rope 63 is divided into two sections in the middle. The ends of the two tensile elastic ropes 63 are respectively inserted into the cavity 651 and connected to the two sides of the open end of the metal spring piece 66.

[0042] Specifically, a positioning block 65 may have multiple cavities 651, meaning that a positioning block 65 can be used to connect multiple tensile elastic ropes 63.

[0043] The metal spring 66 can undergo elastic deformation when the tensile elastic rope 63 is under force, increasing the elastic buffering capacity of the anti-torsion component 6. The elastic restoring force of the metal spring 66 assists the tensile elastic rope 63 in resisting torsion. At the same time, the positioning block 65 can fix the middle position of the tensile elastic rope 63, making the tensile elastic rope 63 more evenly stressed and improving the anti-torsion effect.

[0044] like Figure 3 and Figure 5 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0045] The bottom end of the metal spring 66 is provided with a pointed edge 661 for inserting into the inner protective layer 51. The pointed edge 661 passes through the positioning block 65 and is fixed thereto. After all the pointed edges 661 are inserted into the inner protective layer 51, the adjacent positioning blocks 65 fit together to form a ring structure.

[0046] Furthermore, in this embodiment, slots and inserts can be provided on the sidewalls where adjacent positioning blocks 65 fit together. The connection stability between adjacent positioning blocks 65 can be further improved by the insertion and engagement of the slots and inserts.

[0047] During the installation of the anti-torsion component 6, the first ring 61 and the second ring 62 are sequentially threaded onto the inner sheath 51, and adjacent first rings 61 and second rings 62 are fixed by connectors 64. A ring of positioning blocks 65 is pressed inward by manual or machine operation, so that the pointed edge 661 is inserted into the inner sheath 51. Finally, the ring of positioning blocks 65 forms a stable ring structure, which further enhances the anti-torsion effect. At the same time, the radial displacement of the positioning blocks 65 can further tighten the tensile elastic rope 63, thereby improving the self-stability of the outer sheath 52 during subsequent extrusion and enhancing the subsequent anti-torsion effect.

[0048] like Figures 4 to 5 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0049] The metal spring 66 has perforations 662 on both sides. The end of the tensile elastic rope 63 passes through the perforations 662 and is connected to the side of the metal spring 66 at a distance. An elastic element 663 is connected to the inner side of the open end of the metal spring 66.

[0050] Specifically, in this embodiment, the elastic element 663 can be a spring, a compression spring, or an elastic block.

[0051] The tensile elastic rope 63 is connected to the side of the metal spring 66 that is farther away. When the tensile elastic rope 63 is under force, the metal spring 66 will contract inward to cooperate with the elastic element 663. This facilitates the installation of the elastic element 663 and further increases the elasticity of the metal spring 66, providing stronger recovery force when the cable is twisted and improving the anti-torsion performance.

[0052] like Figures 4 to 5 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0053] Two perforations 662 on the same metal spring 66 are arranged opposite each other; both tensile elastic ropes 63 include an elastic part 631 and a rigid part 632. One end of the elastic part 631 is used to connect to the first collar 61 or the second collar 62, and the other end extends to the perforation 662; the rigid part 632 is located inside the metal spring 66 and is arranged in a bent shape. One end of the rigid part 632 is connected to the elastic part 631 through the perforation 662, and the other end is bent and extends to the side of the distant metal spring 66 for connection; the rigid parts 632 on the two tensile elastic ropes 63 are respectively located on both sides of the perforation 662.

[0054] Specifically, the rigid part 632 can be made of rigid metal or non-metal.

[0055] The elastic part 631 provides basic elastic buffer. When subjected to force, the elastic part 631 drives the metal spring 66 to deform through the rigid part 632, which can improve the stress stability of the metal spring 66. Furthermore, the bending setting of the rigid part 632 can make the two through holes 662 on the metal spring 66 face each other during processing, which improves the processing convenience of the metal spring 66.

[0056] like Figure 5 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0057] A gap is left between the bend of the rigid part 632 and the inner wall of the metal spring 66 that is not connected.

[0058] The gap between the rigid part 632 and the non-connected inner wall of the metal spring 66 is the deformable space of the metal spring 66, which realizes the control of the deformation of the metal spring 66 and extends the service life of the metal spring 66.

[0059] like Figure 3 and Figure 6 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0060] The connector 64 includes a plug ring 641 and a plug groove 642. The plug ring 641 is coaxially fixed to one end face of the first ring 61 and the second ring 62, and the plug groove 642 is coaxially opened on the other end face. The plug ring 641 and the plug groove 642 are plugged into each other.

[0061] The cooperation between the plug ring 641 and the plug slot 642 facilitates the installation of the anti-torsion component 6, while providing a reliable mechanical connection to ensure the effective transmission of force between adjacent anti-torsion components 6, thereby enhancing the integrity and reliability of the cable's anti-torsion structure.

[0062] like Figure 3 and Figure 6 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0063] The insertion ring 641 and the insertion groove 642 have an arc-shaped limiting part 643, the length direction of which is parallel to the axial direction of the insertion ring 641.

[0064] The arc-shaped limiting part 643 can prevent the plug ring 641 and the plug groove 642 from rotating relative to each other, while ensuring that the anti-torsion component 6 maintains the correct connection direction during cable torsion, so that the anti-torsion force always works in the predetermined direction, improving the accuracy and effectiveness of the anti-torsion component 6 in resisting torsion, and further enhancing the anti-torsion performance of the cable.

[0065] The above are merely 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 within the protection scope of the present invention.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A drilling power cable for oil platforms, characterized in that, The device includes multiple conductors (1), each conductor (1) is provided with an insulation layer (2), and the multiple insulation layers (2) are provided with the same shielding layer (3). A filling layer (4) is provided between the shielding layer (3) and the insulation layer (2). A sheath layer (5) is provided outside the shielding layer (3). The sheath layer (5) includes an inner sheath layer (51) and an outer sheath layer (52). Multiple sets of anti-torsion components (6) are provided at intervals between the inner sheath layer (51) and the outer sheath layer (52). The anti-torsion components (6) are used to generate a counteracting force in the opposite direction when the outer sheath layer (52) is twisted, and each set of anti-torsion components (6) is interconnected. The anti-torsion component (6) includes a first collar (61), a second collar (62), a tensile elastic rope (63), and a connector (64). The first collar (61) and the second collar (62) are both sleeved on the inner protective layer (51). The tensile elastic rope (63) has multiple components and is connected between the first collar (61) and the second collar (62). The connector (64) is used to connect the first collar (61) and the second collar (62) on the adjacent anti-torsion component (6). Each of the tensile elastic ropes (63) is provided with a positioning block (65) in the middle. 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 facing upward. The tensile elastic rope (63) is divided into two sections in the middle. 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 spring (66).

2. The drilling power cable for oil platforms as described in claim 1, characterized in that, The filling layer (4) includes multiple filling strips (41), and multiple conductors (1) are twisted together after the insulating layer (2) is applied. The filling strips (41) are twisted together at intervals between adjacent conductors (1), and the outer side of each filling strip (41) is pressed against the inner side of the shielding layer (3).

3. The drilling power cable for oil platforms as described in claim 1, characterized in that, The metal spring (66) has a pointed edge (661) at its bottom end for inserting into the inner protective layer (51). The pointed edge (661) penetrates the positioning block (65) and is fixed thereto. After all the pointed edges (661) are inserted into the inner protective layer (51), the adjacent positioning blocks (65) fit together to form a ring structure.

4. The drilling power cable for oil platforms as described in claim 1, characterized in that, The metal spring (66) has perforations (662) on both sides. The end of the tensile elastic rope (63) passes through the perforations (662) and is connected to the side of the metal spring (66) at a distance. An elastic element (663) is connected to the inner side of the open end of the metal spring (66).

5. The drilling power cable for oil platforms as described in claim 4, characterized in that, Two perforations (662) on the same metal spring (66) are arranged opposite each other; both sections of the tensile elastic rope (63) include an elastic part (631) and a rigid part (632). One end of the elastic part (631) is used to connect the first collar (61) or the second collar (62), and the other end extends to the perforation (662); the rigid part (632) is located inside the metal spring (66) and is arranged in a bent shape. One end of the rigid part (632) is connected to the elastic part (631) through the perforation (662), and the other end is bent and extends to the side of the distant metal spring (66) and connected; the rigid parts (632) on the two sections of the tensile elastic rope (63) are respectively located on both sides of the perforation (662).

6. The drilling power cable for oil platforms as described in claim 5, characterized in that, A gap is left between the bend of the rigid part (632) and the inner wall of the metal spring sheet (66) that is not connected.

7. The drilling power cable for oil platforms as described in claim 1, characterized in that, The connector (64) includes a plug ring (641) and a plug groove (642). The plug ring (641) is coaxially fixed on one end face of the first collar (61) and the second collar (62). The plug groove (642) is coaxially opened on the other end face. The plug ring (641) and the plug groove (642) are plugged into each other.

8. The drilling power cable for oil platforms as described in claim 7, characterized in that, The insertion ring (641) and the insertion groove (642) have an arc-shaped limiting part (643), the length direction of which is parallel to the axial direction of the insertion ring (641).

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