Distortion-resistant and compression-resistant cable for oil platform

Abstract

The invention discloses an anti-distortion and anti-compression cable for an oil platform. The anti-distortion and anti-compression cable is suitable for signal or power transmission in a high-corrosion, high-humidity and high-mechanical-disturbance environment. The cable comprises a plurality of strands of silver-plated copper stranded wire core bodies, a micro-foaming silica gel anti-fatigue buffer layer is arranged outside the silver-plated copper stranded wire core bodies, a movable sleeve layer structure is sleeved outside the silver-plated copper stranded wire core bodies, the movable sleeve layer is composed of a low-friction coating, a sliding main sleeve layer and a rigid shape limiting shell layer, the core wires are allowed to slide freely and be sleeved and positioned when bent and twisted, and structural fatigue and dislocation are prevented. The cable filling body is composed of a high-density supporting framework and a flame-retardant silica gel rope, and an anti-torsion fiber braid layer, a metal shielding layer and a multifunctional sheath layer of a sandwich structure are arranged outside the cable filling body. The cable has the advantages of torsion resistance, compression resistance, self-adaptive structure, self-healing protection and excellent shielding performance, adapts to extreme platform working conditions, improves the system reliability and prolongs the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a cable for anti-twist and anti-pressure oil platforms. BACKGROUND

[0002] With the deep development of marine oil and gas resources, the operating environment of oil platforms as key energy equipment generally has characteristics such as high corrosion, high humidity and heat, high mechanical disturbance, and strong electromagnetic interference. In such harsh environments, special cables used for signal control and power transmission not only need to have basic properties such as flame retardation, fire resistance, and stable insulation, but also need to meet the structural stability under multi-axial combined action such as bending, twisting, stretching, and compression caused by platform movement or wave load.

[0003] The common oil platform cables on the market mainly adopt the following structural configuration: the conductor core is usually tinned copper or bare copper stranded, and is covered with conventional polyethylene or cross-linked polyolefin insulation; to enhance the extrusion resistance of the cable, a filling core or polyester tape wrapping is usually provided; the outer sheath is made of flame-retardant polyvinyl chloride or polyurethane material, which has certain oil resistance and mechanical strength; and individual models are provided with a single layer of metal braid shielding to meet the signal requirements.

[0004] Although the above structure has certain performance in conventional industrial cables, there are still the following outstanding problems in the marine platform environment: The conductor structure is easily damaged by torsional stress: under the reciprocating movement of platform equipment, frequent cable dragging, and switching of suspension state, the friction coefficient between the core and the insulation layer in the traditional cable is large, and it is difficult to slide cooperatively, which can easily cause core structure breakage, breakage, or core deviation failure after long-term use.

[0005] Lack of dynamic pressure buffering design: the filling structure of ordinary cables is mostly static and dense, and the buffering protection effect is limited when dynamic bending or instantaneous flattening occurs, especially when repeatedly pulling in a small threading hole or conduit, which can easily cause structural collapse.

[0006] The sheath function is single and the environmental adaptability is poor: the existing cable sheath is mainly a single material layer, which is difficult to meet multiple requirements such as corrosion resistance, water vapor resistance, impact resistance, and self-repairing, and has a short service life and high maintenance cost.

[0007] Lack of free rotation and axial decoupling structure: the traditional cable structure is generally rigidly connected and cannot adapt to the torque release requirement of the cable in spiral deformation or long-term swinging, which can cause problems such as local stress concentration, insulation cracking, and cable rupture.

[0008] Therefore, there is an urgent need for a new type of structural cable with self-sliding, anti-deviation limiting, anti-pressure buffering, and multi-functional sheath to improve the long-term stability and safety and reliability of the cable in extreme environments such as oil platforms. SUMMARY

[0009] The present application aims to solve the problem that the existing cable for oil platforms fails due to core structure misplacement, insulation damage, mechanical fatigue or signal attenuation when operating in a bending, twisting, high humidity, high corrosion and strong electromagnetic interference environment, and provides a torsion-resistant and pressure-resistant cable for oil platforms, which realizes multiple performance improvements such as core line free sliding, torque absorption, insulation limiting, corrosion self-healing and shielding protection through the synergistic design of a composite functional structure.

[0010] The torsion-resistant and pressure-resistant cable for oil platforms provided by the present application comprises, in order from the inside out, the overall structure: The conductor core, the anti-fatigue buffer layer, the movable sleeve layer (with sliding friction reduction and limiting rigidity), the tensile core, the filler, the anti-torsion fiber braid layer, the metal shielding layer and the multifunctional sheath layer.

[0011] Through the functional synergy between the structures, the present application can provide stable, safe and durable power or signal transmission capability in high dynamic mechanical interference and extreme environment.

[0012] The specific technical solutions are as follows: In a preferred example, the cable provided by the present application comprises: the conductor core adopts a multi-stranded silver-plated copper stranded structure to enhance corrosion resistance and high-frequency signal stability; the anti-fatigue buffer layer adopts micro-foamed silica gel to effectively disperse torsional stress and absorb vibration energy. In the movable sleeve layer structure: the inner layer adopts a PTFE or fluorinated graphite coating with a friction coefficient less than 0.08; the middle layer uses UHMWPE or fluoroplastic foam material to provide a flexible sliding path; the outer layer is a semi-hard polyether ether ketone or reinforced nylon with shape limiting, positioning and external force distortion resistance functions.

[0013] Specifically, the movable sleeve layer structure allows the core line to rotate freely in a bending or twisting state, releases the axial torque, and avoids core line fatigue or breakage.

[0014] In a preferred example, a tensile core is provided in the present application, which is a low-carbon steel flexible member with multiple groups of friction protrusions attached to the surface to form a contact limiting structure with the inner wall of the movable sleeve layer.

[0015] Specifically, this structure can effectively buffer the displacement of the core line when subjected to axial tension, limit the overall misplacement of the core line, and enhance the tensile load capacity.

[0016] In a preferred example, the filler of the cable is composed of a fan-shaped high-density polyethylene skeleton and a flame-retardant silica gel rope, which is used to support the cable core structure and maintain the roundness.

[0017] Specifically, this structure can maintain the inner core without deformation when the cable is subjected to pressure or lateral extrusion, thereby improving the overall pressure resistance of the structure.

[0018] In a preferred example, the anti-torsion fiber braid layer is formed by interlaced weaving of aramid fibers and glass fibers at +45° or +60°, for absorbing the combined forces in multiple axial directions.

[0019] Specifically, the braid structure is optimized by fiber winding angle to realize coordinated release of axial / radial strain and improve the dynamic durability of the cable.

[0020] In a preferred example, the metal shielding layer is a double-layer composite structure of inner aluminum foil + outer copper wire braid, which respectively plays the roles of electromagnetic sealing and electrical grounding.

[0021] Specifically, the shielding layer can effectively reduce the influence of external electromagnetic interference on signal transmission, and quickly discharge charges under lightning or large current impact to ensure the safety of the cable.

[0022] In a preferred example, the multifunctional sheath layer is a sandwich structure, including: flexible fluorinated polyolefin to improve adhesion and flexibility; a composite structure of foamed fluororubber and ceramic fiber short felt to resist pressure and impact; a self-healing TPU mixed with nano zinc oxide coating, and optionally a temperature-sensitive color-changing wire and a water-blocking self-healing adhesive strip.

[0023] Specifically, the sheath layer can achieve self-healing recovery when subjected to mechanical damage or water vapor intrusion, and has warning, sealing and environmental protection functions.

[0024] In summary, the present application ensures that the conductor core has the ability to twist freely under stress conditions through modular functional design of the layered structure, and significantly improves the operating life and signal transmission stability of the cable in high-strength dynamic working conditions by combining enhanced limiting and anti-fatigue cushioning measures.

[0025] The beneficial effects achieved by the present application are: 1. In the present application, the composite dynamic sleeve layer structure composed of the frictional drag reduction layer, the sliding main sleeve layer and the rigid limiting shell layer is arranged outside the conductor core, so that the conductor core can slide relatively and remain positioned when the cable is bent or twisted, significantly reducing the fatigue damage caused by the torque transmission of the core, and improving the structural stability and service life of the cable under complex motion conditions.

[0026] 2. In the present application, the filler adopts the combination of high-density polyethylene support skeleton and flame-retardant silicone rubber rope, which not only enhances the compressive strength of the cable core structure, but also effectively maintains the roundness of the overall cable core, improving the deformation resistance of the cable under high external pressure conditions.

[0027] 3. In the present application, the multifunctional sheath layer adopts a sandwich structure composed of flexible fluorinated polyolefin, foamed fluororubber ceramic fiber composite layer and self-healing TPU outer protective layer. It not only has excellent impact resistance, oil resistance and ultraviolet resistance, but also can realize self-healing sealing when local damage or external injury occurs, further improving the safety and maintenance convenience of the cable in harsh environments such as oil platforms. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic diagram of the cross-sectional structure of the anti-twisting and anti-pressing cable for oil platforms in the present application; Figure 2 is a schematic diagram of the partial cross-sectional structure of the anti-twisting and anti-pressing cable for oil platforms in the present application; Figure 3 is a schematic diagram of the structure of the anti-tension core in the present application; Figure 4 is a schematic diagram of the structure of the anti-tension core and the filler in the present application.

[0029] REFERENCE NUMERALS: 1, conductor core; 2, anti-fatigue buffer layer; 3, movable sheath layer; 31, frictional drag reduction coating; 32, sliding main sheath layer; 33, rigid shape-limiting shell layer; 4, filler; 5, anti-twist fiber braiding layer; 6, metal shielding layer; 7, multifunctional sheath layer; 71, inner layer; 72, middle layer; 73, outer layer; 8, anti-tension core; 81, frictional protrusion. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the present application clearer and more intelligible, the present application will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] It is understood that these descriptions are only exemplary and are not intended to limit the scope of the present application.

[0032] Some embodiments of the anti-twisting and anti-pressing cable for oil platforms provided by the present application will be described below with reference to the accompanying drawings. Embodiment 1:

[0033] In combination Figures 1-4 with the drawings, the anti-twisting and anti-pressing cable for oil platforms provided by the present application is mainly composed of the following components in order: Conductor core 1: In this embodiment, the conductor core 1 is a multi-stranded silver-plated copper stranded structure. High-flexibility silver-plated copper wire strands with a stranded pitch of not more than 30 mm are selected to enhance its conductivity, corrosion resistance and flexibility, and are suitable for high-frequency signal or weak electric control signal transmission.

[0034] Anti-fatigue buffer layer 2: coated on the outer periphery of the conductor core wire 1, made of micro-foamed silica gel, with soft and high elastic structural characteristics, used to absorb external stress impact and dynamic strain generated during cable movement, effectively reducing core wire fatigue damage and improving durability.

[0035] Dynamic sleeve layer 3: This layer is the core of the innovation of the present application, which is sleeved on the outer periphery of the anti-fatigue buffer layer 2 and includes, from inside to outside: Friction reduction coating: made of polytetrafluoroethylene or fluorinated graphite material, with a friction coefficient less than 0.08, used to reduce the frictional resistance between the conductor core wire and the inner wall of the sleeve layer; Slip main sleeve layer: made of ultra-high molecular weight polyethylene or fluoroplastic micro-foamed structure, with a thickness range of 0.3-1.0 mm, having low-friction sliding and local structural buffering performance; Rigid shape limiting shell layer: made of semi-hard polyether ether ketone or reinforced nylon material, with a plurality of equally distributed reinforcing ribs or annular limiting grooves not shown on the outer periphery, which can inhibit deformation and prevent core wire structure misplacement.

[0036] During cable bending, stretching or spiral deformation, the conductor core wire 1 can have limited free sliding or micro-torsion within the dynamic sleeve layer 3, effectively decomposing the internal axial torque and improving the service life.

[0037] Tensile core 8: provided in the center of the cable core, made of low-carbon steel flexible component, with a plurality of friction protrusions 81 on the surface, which form a limiting fit with the surface of the dynamic sleeve layer 3, used to limit the excessive sliding displacement of the conductor core wire, playing a role of structure correction and stress constraint.

[0038] Filler 4: provided between a plurality of dynamic sleeve layers 3, composed of a high-density polyethylene support skeleton with a fan-shaped cross-section and a flame-retardant silica gel rope, used to support the cable core and maintain its overall round structure, while improving the anti-extrusion performance to prevent core wire misplacement or structural collapse.

[0039] Anti-torsion fiber braid layer 5: coated on the outer periphery of the filler 4, formed by mixing ±45° cross-wound aramid fibers and glass fibers. This layer can uniformly disperse the stress under the combined action of cable tension and torsion, stabilize the overall structure under dynamic working conditions, and enhance the anti-torsion performance.

[0040] Metallic shielding layer 6: provided on the outer periphery of the anti-torsion fiber braid layer 5, including, from inside to outside: an aluminum foil wrapping layer providing electromagnetic sealing and lightning shielding performance; a copper wire braid net enhancing anti-interference capability and forming an equipotential connection with the ground net. This double-layer shielding structure has good high-frequency shielding and anti-impact electromagnetic protection capability.

[0041] Multifunctional sheath layer 7: provided on the outermost periphery of the cable, including, from inside to outside: Inner layer 71: flexible fluorinated polyolefin, used to improve the flexibility and adhesion of the overall sheath; Middle layer 72: formed by foamed fluororubber and ceramic fiber short felt composite, thickness not less than 1.5 mm, with good impact resistance, pressure resistance and fire resistance; Outer layer 73: self-healing thermoplastic polyurethane TPU mixed with nano zinc oxide material, with corrosion resistance, oil resistance, ultraviolet aging resistance and small damage self-healing closure function. Optional temperature sensitive color change warning line or water blocking self-healing adhesive strip for environmental identification and emergency protection. Example 2:

[0042] This embodiment provides a torsion-resistant and pressure-resistant cable suitable for running in ultra-low temperature environment and high dynamic load state, especially suitable for signal and power mixed transmission line in high frequency vibration scene of northern deep sea oil platform.

[0043] The overall structure of the cable includes from inside to outside: Conductor core wire 1: high flexibility silver plated copper stranded wire with pitch of 20 mm, single wire diameter of 0.12 mm, and layered bundle stranded twisting mode, with excellent electrical conductivity and bending flexibility, and improved service life in salt spray and icing environment.

[0044] Fatigue-resistant buffer layer 2: micro-foamed low modulus silicone material is used to coat the conductor core wire, the foaming ratio is about 3 times, and the thickness is 0.6 mm, which can effectively alleviate the fatigue risk of the core wire caused by material embrittlement under low temperature condition.

[0045] Dynamic sleeve layer 3: frictional drag reduction coating: fluorinated graphite composite lubricating coating with friction coefficient of 0.06; slip main sleeve layer: closed cell micro-foamed ultra-high molecular weight polyethylene UHMWPE with thickness of 0.8 mm; rigid limiting shell layer: enhanced nylon mixed glass fiber material is selected, and a shallow slot-shaped limiting rib is arranged every 20 mm, forming a directional sliding sleeve constraint.

[0046] This structure can ensure the flexible relative sliding between the conductor core wire and the insulating sleeve layer when the cable is subjected to dynamic tension and vibration in the longitudinal direction, while inhibiting the eccentricity of the structure.

[0047] Tensile core 8: flexible low carbon steel rope structure with rope diameter of 2.5 mm, surface hot-pressed with friction protrusions 81 with frosted surface, locally bonded with the inner surface of the dynamic sleeve layer, forming an anti-displacement limiting point to improve the structural stability under tension response.

[0048] Filler 4: six-petal high-density polyethylene anti-extrusion support skeleton is arranged between the plurality of dynamic sleeve layers, the outer gap of the skeleton is filled with high-temperature resistant flame-retardant silicone rubber strip, the thickness is 4 mm, the structure is dense, and the cable pressure resistance and cable core roundness maintaining force are effectively improved.

[0049] Anti-torsion fiber braid layer 5: aramid and glass fiber are selected to form a cross-braid structure at ± 60°, which is more suitable for frequent dynamic eccentric vibration scenarios than ± 45° angle, can quickly dissipate composite shear force, and improve fatigue cycle number.

[0050] Metal shielding layer 6: sequentially includes an internal 0.03mm thick aluminum foil wrap, a spiral wrap with 100% overlap rate; an outer tin-plated copper wire braid mesh with coverage rate ≥85%, wire diameter 0.12mm, mesh density medium tight, providing stable equipotential grounding path.

[0051] Multifunctional sheath layer 7: inner layer 71 is flexible fluorinated polyolefin with thickness 0.6mm; middle layer 72 is a hot-pressed composite material of 1.8mm thick foamed fluororubber and short-cut ceramic fiber felt with compression resistance not less than 50kPa; outer layer 73 is self-healing thermoplastic polyurethane TPU coated with nano zinc oxide, with two temperature-sensitive color-changing warning lines on the outer wall that can change from blue to red and a water-blocking self-healing sealing tape for automatic sealing and recovery after water vapor intrusion.

[0052] The embodiment is subjected to continuous 2500 times of bending test under alternating normal temperature and extreme cold conditions-40℃~60℃, without conductor fracture or structural layer dislocation, meeting the long-term operation requirements under extreme conditions, further verifying the environmental adaptability and torsion buffering reliability of the structure.

[0053] Working principle and use process of the application: The anti-torsion and anti-pressure cable for oil platform provided by the application adopts a multi-layer composite structure design, is suitable for signal or power transmission in extreme environments such as offshore oil platforms with high humidity, high corrosion and high mechanical disturbance, and has the following overall working principle: During use, the conductor core wire 1 inside the cable bears the conduction task of electrical signals or current, and the multi-strand silver-plated copper stranded structure ensures good electrical conductivity, corrosion resistance and high-frequency transmission stability.

[0054] In order to avoid fatigue fracture of the core wire during installation, bending or vibration, an anti-fatigue buffer layer 2 is provided outside the core wire, which provides effective stress buffering through a micro-foamed silicone structure to improve structural flexibility and shock absorption performance.

[0055] The key functional components of the cable are the dynamic sleeve layer 3, which includes a friction drag reduction coating, a sliding main sleeve layer and a rigid shape limiting shell layer: The friction drag reduction coating can significantly reduce the sliding friction between the core wire and the sleeve layer; The sliding main sleeve layer allows the core wire to have a small amount of axial sliding and rotation in the twisted, bent and other states, avoiding torque accumulation; The rigid shape limiting shell layer plays a role in structural sleeve connection and deformation constraint, ensuring smooth sliding process and the core wire being in a controllable state at all times.

[0056] The structure realizes self-adaptive torsion reduction function between the core wire and the insulating sleeve layer, thereby significantly improving the service life of the cable in a dynamic stress environment.

[0057] A tensile core 8 is arranged at the center of the cable core for bearing axial tensile force and limiting displacement or instability of the conductor core wire structure by cooperating with the dynamic sleeve layer 3 through the friction protrusions 81 arranged on the surface.

[0058] Inside the cable, the filler body 4 is combined with a high-density polyethylene support skeleton and a flame-retardant silica gel rope to effectively support the cable core, enhance the compression resistance, and avoid structural collapse or stress deviation of the core wire.

[0059] To prevent external axial tensile stress from directly acting on the conductor layer, a torsion-resistant fiber braid layer 5 is arranged outside the cable, which is composed of ±45° cross-braided aramid fibers and glass fibers and can form a force path to play a role in stress diversion and structural release.

[0060] The whole cable is electromagnetically shielded by a metal shielding layer 6, and the aluminum foil layer in the double-layer structure is used for closed shielding, and the copper braid layer is used for electromagnetic interference suppression and equipotential grounding protection.

[0061] The outermost multifunctional sheath layer 7 has a composite protection function, including a flexible adhesive layer, a foamed buffer layer, and an external self-healing layer, and can adapt to salt spray, high temperature, high impact, and other offshore working conditions by combining temperature-sensitive color change and water-blocking sealing mechanisms.

[0062] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cable for use in a torsionally stiff and compression resistant oil platform, c h a r a c t e r i s e d in that The utility model relates to a kind of cable, including: Multiple conductor cores (1), the conductor core (1) is multiple silver-plated copper stranded structure; Anti-fatigue buffer layer (2), the outer periphery of the conductor core (1) is covered, and it is micro-foamed silica gel layer; Dynamic sleeve layer (3), the outer periphery of the anti-fatigue buffer layer (2) is sleeved, and the dynamic sleeve layer (3) includes successively from inside to outside: friction drag reduction coating, selects polytetrafluoroethylene or fluorinated graphite material;Slip main sleeve layer, it is ultra-high molecular weight polyethylene or fluoroplastic micro-foamed structure;Rigid limit shell layer, it is semi-hard polyether ether ketone or reinforced nylon material; Tensile core (8) is arranged in cable core center, for bearing tensile stress, its surface is equipped with several friction protrusions (81), and contact limiting cooperation is formed with dynamic sleeve layer (3); Filler body (4) is equipped between multiple dynamic sleeve layers (3), including high-density polyethylene support skeleton with sector cross section and fire-retardant silica gel rope; Anti-torsion fiber braid layer (5) is covered in the outer periphery of the filler body (4), and is formed by the mixed weaving of directional winding aramid fiber and glass fiber; Metal shielding layer (6) is arranged in the outer periphery of the anti-torsion fiber braid layer (5), and includes inner layer aluminum foil wrapping layer and outer layer copper wire braiding net; Multifunctional sheath layer (7) is arranged in the outermost periphery, and includes successively from inside to outside: inner layer (71): flexible fluorinated polyolefin;Middle layer (72): foamed fluororubber and ceramic fiber short felt composite structure;Outer layer (73): self-healing thermoplastic polyurethane mixed nano zinc oxide structure; Wherein, the dynamic sleeve layer (3) allows the conductor core (1) to slide relatively along the axial direction under the condition of cable bending and torsion and keep sleeve joint positioning, so as to eliminate torque transmission and avoid dislocation or fatigue damage between conductor core and dynamic sleeve layer.

2. The kink and crush resistant oil platform cable of claim 1, wherein, The friction coefficient of the friction drag reduction coating is less than 0.08, the thickness of the slip main sleeve layer is 0.3-1.0 millimeter, the rigid limit shell layer is externally provided with multiple equidistantly distributed reinforcing ribs or annular limiting grooves for enhancing the limit anti-deviation function.

3. The kink and crush resistant oil platform cable of claim 1, wherein, The tensile core (8) is composed of low-carbon steel flexible member, and is externally attached to multiple groups of friction protrusions (81) for forming limiting support by being glued and adhered to the surface of the dynamic sleeve layer (3).

4. The kink and crush resistant oil platform cable of claim 1, wherein, The anti-torsion fiber braid layer (5) is formed in ±45° cross winding mode for releasing coupled stress under the combined action of axial tension and torsion.

5. The kink and crush resistant oil platform cable of claim 1, wherein, The middle layer (72) of the multifunctional sheath layer (7) is foamed fluororubber and ceramic fiber short felt composite with a thickness not less than 1.5 millimeter, and the outer layer (73) is externally provided with temperature-sensitive color-changing wire and water-blocking self-healing adhesive tape.

6. The kink and crush resistant oil platform cable of claim 1, wherein, The conductor core (1) is high-flexibility silver-plated copper stranded wire with stranded pitch ≤30 mm.

7. The kink and crush resistant oil platform cable of claim 1, wherein, The high-density polyethylene support skeleton in the filler body (4) is cross-shaped sector structure, four bifurcations are attached to the outer periphery of multiple dynamic sleeve layers (3) circular arc profile, and hollow limit channel is arranged in the support skeleton for adapting cable core strain deformation.

8. The kink and crush resistant oil platform cable of claim 1, wherein, The braiding density of the copper wire braiding net in the metal shielding layer (6) is not less than 85%, and the aluminum foil wrapping layer is spiral-wound structure with lap joint rate not less than 25% to improve shielding continuity and electromagnetic interference suppression effect.

9. The kink resistant, pressure resistant cable for use in oil platforms of claim 1, wherein, The multifunctional sheath layer (7) is integrally formed by a hot extrusion co-extrusion process, and a transition interface layer can be formed between the middle layer (72) and the outer layer (73), so as to improve the adhesion strength and peeling resistance between the multi-layer sheaths.

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