Low-temperature-resistant temperature-limiting drilling power cable for oil platform

Abstract

A low-temperature-resistant temperature-limiting drilling power cable for an oil platform comprises a conductor formed by twisting a main wire core conductor and a ground wire core conductor, an insulating layer wrapping the outer surface of the main wire core conductor and the outer surface of the ground wire core conductor, and a functional layer wrapping the conductor, the functional layer sequentially comprises an inner sheath, a flexible tin-plated alloy wire braided layer and an outer sheath from inside to outside; the inner sheath and the outer sheath are made of an irradiation crosslinking polyurethane material which is compatible with an insulating material and can resist the temperature of 90 DEG C. The cable not only can be adapted to normal work in a low-temperature environment, but also has an automatic temperature limiting protection function, and can be automatically powered off when a system is overheated, so that online electrical equipment is effectively protected. Meanwhile, the cable needs to have multiple performances of flame retardance, scratch resistance, tensile strength, oil resistance, acid and alkali resistance, salt spray resistance and the like so as to cope with the severe environment of the drilling platform, a temperature monitoring device does not need to be additionally installed, the installation, use and maintenance processes are simplified, and the operation efficiency and safety are improved.

Description

Technical Field

[0001] This utility model relates to the field of wire and cable technology, specifically a low-temperature resistant drilling power cable designed for oil drilling platforms. It aims to meet the high-performance requirements of cables under extreme working environments, ensure stable operation of electrical equipment under low-temperature conditions, and provide automatic power-off protection when the system overheats, thereby improving the safety and efficiency of drilling operations. Background Technology

[0002] As a key facility for offshore oil exploration and development, oil drilling platforms operate in complex and variable environments, particularly characterized by low temperatures, high humidity, salt spray corrosion, and potential fire risks. These factors place extremely high demands on the electrical cables used in their operation. Traditional cables are prone to hardening and embrittlement at low temperatures, affecting their conductivity and mechanical strength. Furthermore, they lack effective self-protection mechanisms under high temperatures or short-circuit conditions, potentially leading to damage to electrical equipment or even fires, seriously threatening operational safety.

[0003] Insufficiency of existing technology:

[0004] Limited low-temperature performance: The performance of most conventional cables degrades in low-temperature environments, affecting the stability of signal transmission and power supply.

[0005] Lack of automatic temperature limiting protection: Traditional cables do not have automatic temperature control function. Once the temperature is too high, the power supply cannot be cut off in time, which can easily cause equipment damage or safety accidents.

[0006] Poor weather resistance: Ordinary cables are not durable enough in the face of harsh conditions such as oil stains, acid and alkali corrosion, and salt spray erosion on drilling platforms.

[0007] Low mechanical strength: In complex working environments, cables are susceptible to damage from external forces, affecting their service life and safety.

[0008] Installation and maintenance are complex: additional temperature monitoring and protection devices are required, which increases installation costs and operational difficulty.

[0009] In view of the above background, the present invention aims to provide a low-temperature resistant drilling power cable specifically designed for oil drilling platforms. Utility Model Content

[0010] To address the problems existing in the prior art, this utility model provides a low-temperature resistant drilling power cable for oil platforms. This cable not only adapts to normal operation in low-temperature environments but also features automatic temperature limiting protection, automatically cutting off power when the system overheats, effectively protecting connected electrical equipment. Furthermore, the cable possesses multiple properties such as flame retardancy, abrasion resistance, tensile strength, oil resistance, acid and alkali resistance, and salt spray resistance to cope with the harsh environment of drilling platforms. It eliminates the need for additional temperature monitoring devices, simplifying installation, use, and maintenance, and improving operational efficiency and safety.

[0011] This utility model is implemented as follows: a low-temperature resistant drilling power cable for oil platforms includes a conductor formed by stranding a main conductor and a ground conductor, an insulation layer wrapped around the outer surfaces of the main conductor and the ground conductor, and a functional layer wrapped around the conductor. The insulation layer is an automatically temperature-controlled semi-conductive layer. The functional layer, from the inside out, consists of an inner sheath, a flexible tin-plated alloy wire braided layer, and an outer sheath. The thickness of the inner sheath is less than the thickness of the outer sheath. The inner and outer sheaths are made of radiation-crosslinked polyurethane material compatible with the insulation material and resistant to temperatures up to 90°C.

[0012] The surface of the stranded copper wire conductor is smooth and burr-free. The surface of the conductor formed by the stranding has a slight indentation at the wire joints, and the overall shape is perfectly round. The thickness of the insulation layer ranges from 0.8 to 3.0 mm, depending on the cable specification. The inner sheath thickness is 1 / 3 to 1 / 2 mm of the outer sheath thickness. The flexible tin-plated alloy wire braided layer is available in specifications such as 0.15 mm, 0.20 mm, 0.25 mm, and 0.30 mm, depending on the outer diameter of the semi-finished cable during braiding. The thickness of the outer sheath ranges from 1.5 to 5.0 mm, depending on the cable specification.

[0013] The advantages and technical effects of this utility model are as follows: A low-temperature resistant drilling power cable specifically designed for oil platforms features an innovative structure comprising a conductor core precisely twisted together from a main conductor and a ground conductor, an automatically temperature-controlled semi-conductive insulation layer tightly wrapped around the conductor, and an additional multi-functional protective structure. This protective structure, from the inside out, consists of a thin yet robust inner sheath, a high-strength flexible tin-plated alloy wire braided layer, and a thick and durable outer sheath. Both the inner and outer sheaths are made of radiation-crosslinked polyurethane material with a temperature resistance of 90℃, perfectly compatible with the insulation material, ensuring the overall performance and long service life of the cable.

[0014] The cable's superior design gives it several significant advantages, specifically:

[0015] Precise automatic temperature limiting protection: The unique self-limiting semi-conductive insulation layer is preferably made of semi-conductive polyolefin material; with its ultra-long maximum operating temperature life and temperature control accuracy to ±0.5℃, it effectively prevents cable aging caused by local thermal steady-state imbalance and greatly extends the service life.

[0016] Optimized electric field distribution: The smoothing treatment of the conductor surface not only improves the conductivity of the cable, but also achieves a uniform distribution of the electric field in the semi-conductive insulation layer, further enhancing the stability and safety of the cable.

[0017] High strength and compatibility go hand in hand: The inner sheath is made of high-temperature resistant material and is perfectly integrated with the insulation layer to ensure the overall performance of the cable; while the outer high-strength flexible tin-plated alloy wire braided layer enhances the mechanical strength of the cable while ensuring good electromagnetic compatibility.

[0018] Exceptional environmental resistance: The outer sheath is made of a special temperature-resistant polyurethane material, which gives the cable multiple properties such as flame retardancy, oil resistance, flexibility, abrasion resistance, acid and alkali resistance, and salt spray resistance, enabling it to easily cope with various harsh environmental challenges on oil platforms.

[0019] Simplified installation and maintenance: Thanks to the built-in automatic temperature control mechanism, the cable does not require an additional temperature monitoring device, which greatly simplifies the installation, use and maintenance process, improves work efficiency and reduces maintenance costs.

[0020] In summary, the low-temperature resistant drilling power cable for oil platforms of this invention, with its innovative design concept and excellent comprehensive performance, provides strong support for the safe and efficient operation of oil drilling platforms. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of the cable of this utility model.

[0022] In the diagram, 1 is the main conductor core; 2 is the ground conductor core; 3 is the insulation layer; 4 is the inner sheath; 5 is the flexible tin-plated alloy wire braided layer; and 6 is the outer sheath. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0024] Please see Figure 1 A low-temperature resistant drilling power cable for oil platforms, with a nominal cross-section of 10–300 mm². 2Cable core count: multi-core; rated voltage: 2000V; temperature range: -40~90℃; includes a conductor formed by stranding a main conductor 1 and a ground conductor 2. The surface of the stranded copper wire conductor is smooth and burr-free. The surface of the stranded conductor has slight indentations at the wire connections, but the overall shape is round. It also includes an insulation layer 3 covering the outer surfaces of the main conductor and the ground conductor, and a functional layer surrounding the conductor. The insulation layer is an automatically temperature-controlled semi-conductive layer. The functional layer, from the inside out, consists of an inner sheath 4, a flexible tin-plated alloy wire braided layer 5, and an outer sheath 6. The thickness of the inner sheath is less than that of the outer sheath. Both the inner and outer sheaths are made of radiation-crosslinked polyurethane material compatible with the insulation material and resistant to 90℃ temperatures. Radiation-crosslinked polyurethane material resistant to 90℃ temperatures is a known technology. Radiation crosslinking is a crosslinking technology that uses high-energy rays (such as electron beams, gamma rays, etc.) to induce the formation of chemical bonds between polymer molecular chains. For polyurethane materials, radiation crosslinking can significantly improve their heat resistance, chemical resistance, mechanical properties, and dimensional stability. Especially for applications requiring high-temperature environments, radiation-crosslinked polyurethane exhibits excellent temperature resistance, meeting the requirements for use at 90°C or even higher.

[0025] The aforementioned low-temperature resistant drilling power cable for oil platforms is significantly different from existing cables, specifically in the following aspects:

[0026] Conductor design: This cable is made of main conductor and ground conductor twisted together, and the outer diameter is tightly compressed during the twisting process, making the conductor surface smooth. This design not only optimizes the conductivity of the conductor, but also evenly distributes the electric field of the insulation layer, effectively avoiding the reduction in cable life caused by local thermal inconsistency, and improving the overall stability and safety of the cable.

[0027] Insulation layer innovation: The insulation layer uses a semi-conductive material with automatic temperature control. Through precise material ratio, high-precision temperature control of ±0.5℃ is achieved. This feature ensures that the cable can still work stably under extreme temperature conditions. The automatic power-off protection mechanism effectively prevents equipment damage or safety accidents caused by overheating.

[0028] Inner sheath compatibility: The inner sheath is made of radiation-crosslinked polyurethane material with a temperature resistance of 90℃, which is compatible with the insulation material. Its thickness design protects the insulation layer and ensures the coordination and uniformity of the overall performance of the cable, thus extending the service life of the cable.

[0029] Braided layer reinforcement: The high-strength flexible tin-plated alloy wire braided layer in the functional layer not only meets the overall electromagnetic compatibility requirements of the cable, but also significantly improves the mechanical strength of the cable and enhances its ability to resist external damage, making it suitable for complex operating environments.

[0030] Environmental resistance of the outer sheath: The outer sheath is made of special polyurethane material, which has multiple properties such as flame retardancy, oil resistance, flexibility, wear resistance, acid and alkali resistance, and salt spray resistance. This design enables the cable to adapt to the harsh installation and use environment on oil platforms and can operate stably for a long time without additional protection.

[0031] In summary, this patented cable, through its unique structural design and technological innovation, not only achieves precise automatic temperature control but also significantly improves the cable's physical and mechanical properties and environmental resistance. Furthermore, it simplifies installation and maintenance, providing a safer, more reliable, and more efficient power transmission solution for oil drilling platforms.

[0032] The insulation layer has a thickness of 0.8-3.0 mm. This thickness ensures that the insulation layer effectively isolates the conductor from the external environment, preventing current leakage and short circuits, while avoiding excessive thickness that would increase the cable's stiffness and weight, affecting installation and usage flexibility. Furthermore, an appropriate thickness helps maintain the insulation layer's automatic temperature control performance, ensuring the cable maintains stable electrical performance despite temperature changes.

[0033] The thickness of the inner sheath is 1 / 3 to 1 / 2 of the thickness of the outer sheath. This proportional design ensures that the inner sheath can adequately protect the insulation layer from mechanical damage and chemical corrosion, while also ensuring the overall flexibility and bendability of the cable. Furthermore, the thickness difference between the inner and outer sheaths helps to form an effective heat insulation layer, further improving the cable's temperature resistance.

[0034] The thickness of the flexible tin-plated alloy wire braid is available in 0.15mm, 0.20mm, 0.25mm, and 0.30mm thicknesses depending on the cable specification. This thickness provides sufficient mechanical strength to protect the cable from external pulling and squeezing, while maintaining good flexibility, facilitating cable laying and bending in complex environments. Simultaneously, the use of tin-plated alloy wire enhances the cable's corrosion resistance and electromagnetic compatibility, improving its overall service life and safety.

[0035] In summary, through precise optimization of these key parameters, this patented cable, while maintaining its original excellent performance, further enhances its mechanical strength, flexibility, temperature resistance, and electromagnetic compatibility, making it more suitable for the harsh installation and use environment of oil platforms and providing a more reliable and efficient power transmission guarantee for drilling operations.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-temperature resistant drilling power cable for oil platforms, comprising a conductor formed by stranding a main conductor and a ground conductor, an insulation layer wrapped around the outer surfaces of the main conductor and the ground conductor, and a functional layer wrapped around the conductor, characterized in that: The insulating layer is an automatically temperature-controlled semi-conductive layer. The functional layers, from the inside out, are an inner sheath, a flexible tin-plated alloy wire braided layer, and an outer sheath. The thickness of the inner sheath is less than that of the outer sheath. The inner and outer sheaths are made of the same radiation-crosslinked heat-resistant polyurethane material that is compatible with the insulating material.

2. The low-temperature resistant drilling power cable for oil platforms according to claim 1, characterized in that: The low-temperature resistant drilling power cable for oil platforms is characterized in that the surface of the stranded copper wire conductor is smooth and the cross-section is a complete circle.

3. The low-temperature resistant drilling power cable for oil platforms according to claim 1, characterized in that: The thickness of the insulating layer is 0.8-3.0 mm.

4. The low-temperature resistant drilling power cable for oil platforms according to claim 1, characterized in that: The semiconductive layer is made of a semiconductive polyolefin material.

5. The low-temperature resistant drilling power cable for oil platforms according to claim 1, characterized in that: The thickness of the inner sheath is 1 / 3 to 1 / 2 of the thickness of the outer sheath.

6. The low-temperature resistant drilling power cable for oil platforms according to claim 1, characterized in that: The thickness of the flexible tin-plated alloy wire braided layer is 0.15mm, 0.20mm, 0.25mm, and 0.30mm.

Images