High temperature resistant armored cable

Abstract

The application relates to the technical field of energy exploitation and processing, and particularly relates to a high-temperature-resistant armored cable. The high-temperature-resistant armored cable comprises, from inside to outside, a conductor assembly, an inner sheath layer, a bidirectional armored winding layer and an outer sheath layer. The high-temperature-resistant armored cable can be used for the anti-tension protection of the cable main body under the tensile and extrusion working conditions in oil exploitation through the bidirectional armored structure, so that the cable is not prone to breakage when being lowered and lifted in a deep well, and the effect of adapting to the long-distance laying requirement is achieved.

Description

Technical Field

[0001] This application relates to the technical field of energy extraction and processing, and in particular to a high-temperature resistant armored cable. Background Technology

[0002] In the field of oil extraction, especially in deep well, ultra-deep well, and high-temperature oil and gas field operations, cables, as the core carriers of electrical energy and signal transmission, need to be subjected to extreme conditions such as 120-250℃ (over 300℃ in some ultra-deep wells), high temperature of over 30MPa, tensile force of several tons, and corrosive media such as oil, natural gas, and hydrogen sulfide for a long time. This places stringent requirements on their comprehensive performance. However, existing cables used in oil extraction have many technical shortcomings that are difficult to adapt to: the insulation layer of traditional cable conductors is mostly made of materials such as ordinary polyethylene and cross-linked polyethylene, which are prone to aging and softening at temperatures above 100℃, leading to leakage and short circuits. Even if high-temperature resistant insulation materials are used, the lack of "main insulation + auxiliary insulation" double protection often results in insufficient insulation reliability under long-term high-temperature vibration.

[0003] The armor layer is mostly made of ordinary carbon steel wire or strip wound in one direction. The one-way design is prone to stress concentration and fracture under tension. The carbon steel material is also susceptible to corrosion and rust, which further weakens the mechanical strength. This leads to frequent armor damage and overall breakage during cable pulling and unloading. Although some cables emphasize corrosion resistance, the inner and outer protective layers are made of conventional plastics, which are prone to melting and deformation at high temperatures. Alternatively, they may only focus on high temperature resistance while ignoring the corrosion of the medium, resulting in a service life of only 1-2 years, far less than the expected mining cycle of 3-5 years. At the same time, due to material compatibility and process limitations, the continuous manufacturing length of existing cables is mostly 3,000-5,000 meters, which cannot meet the needs of wells over 6,000 meters deep. Multiple sections need to be spliced, and the splicing points not only have weak points in insulation and are prone to poor contact, but also prolong the equipment deployment time.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following defects: In most existing low-cost cables, the inner / outer sheaths are made of ordinary polyethylene, PVC, or conventional rubber. These materials are prone to softening and aging at temperatures above 120°C, and may even experience insulation layer cracking, leading to electrical performance failure. Furthermore, the temperature resistance levels are inconsistent: Some cables use temperature-resistant materials only for the core conductor insulation layer, but the outer sheath or armor layer has poor compatibility with the temperature-resistant materials, making the overall structure prone to disintegration at high temperatures and unable to operate stably for a long time. Utility Model Content

[0005] To address the problems mentioned in the background section, this application provides a high-temperature resistant armored cable.

[0006] This application provides a high-temperature resistant armored cable, which adopts the following technical solution:

[0007] A high-temperature resistant armored cable includes a conductor assembly, an inner sheath, a bidirectional armored winding layer, and an outer sheath arranged sequentially from the inside to the outside.

[0008] The conductor assembly is formed by stranding multiple mutually insulated sub-conductors, each of which includes a copper wire core and a polyimide film wrapped around the copper wire core.

[0009] The inner sheath is made of polyetheretherketone material and extruded onto the outside of the conductor assembly after cabling;

[0010] The bidirectional armored winding layer is composed of at least one left-winding first winding layer and at least one right-winding second winding layer. Both the first winding layer and the second winding layer are formed by winding stainless steel wire made of stainless steel. The bidirectional armored winding layer, composed of the left-winding first winding layer and the right-winding second winding layer, is the core tensile structure, which greatly improves the mechanical strength of the cable and resists external forces such as tension and friction in oil extraction.

[0011] Optionally, the stainless steel wire used in the first winding layer has a diameter of 1.20 mm, and the stainless steel wire used in the second winding layer has a diameter of 1.40 mm.

[0012] Optionally, the inner sheath is a high-temperature fluoroplastic sleeve.

[0013] Optionally, the diameter of the copper wire core is 4.1 mm.

[0014] Optionally, the continuous length of a single cable is not less than 7,000 meters.

[0015] Optionally, the polyimide film is extruded from polyetheretherketone or polyphenylene sulfide material.

[0016] Optionally, the outer sheath is made of high-temperature resistant polyethylene material.

[0017] Optionally, the polyimide film is wrapped with an insulating layer, which is made of a high-temperature resistant rubber material.

[0018] In summary, this application includes the following beneficial technical effects:

[0019] 1. This utility model, by setting up components such as a bidirectional armored winding layer, conductor assembly, and inner sheath, and through the cooperative relationship of the first winding layer and the second winding layer being wound in opposite directions, enables the bidirectional armored winding layer to provide tensile support and structural stability for the conductor assembly and inner sheath through material strength and stress balance. In this way, the device can provide tensile protection for the cable body under tension and compression conditions in oil extraction through a bidirectional armored structure, ensuring that the cable is not easily broken when being lowered and raised in deep wells, and is suitable for long-distance laying requirements.

[0020] 2. This utility model, by setting up components such as an inner sheath, an outer sheath, and a polyimide film, and through the double-layer protection of the inner and outer sheaths and the insulating bonding relationship between the polyimide film and the copper wire core, enables the inner and outer sheaths and the polyimide film to provide high-temperature insulation and protection for the internal conductive structure of the cable through the high-temperature resistant material properties. In this way, the device can provide anti-aging and short-circuit protection for the conductive core of the cable in the high-temperature environment at the bottom of the oil well through multiple layers of high-temperature resistant components, thus ensuring the stable transmission of electrical energy by the cable. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application;

[0022] Figures 2 This is a partial structural diagram of an embodiment of this application;

[0023] Figures 3 This is a partial structural diagram of the bidirectional armored winding layer in an embodiment of this application;

[0024] Figures 4 This is a schematic diagram of the partial structure installation of the bidirectional armored winding layer in an embodiment of this application;

[0025] Reference numerals: 1. Conductor assembly; 2. Polyimide film; 3. Insulating layer; 4. Inner sheath; 5. Bidirectional armored winding layer; 51. First winding layer; 52. Second winding layer; 6. Outer sheath. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-4 This application will be further described in detail below. The technical solutions in the embodiments of this application will be clearly described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0027] This application discloses a high-temperature resistant armored cable.

[0028] like Figure 1As shown, a high-temperature armored cable includes, from the inside out, a conductor assembly 1, an inner sheath 4, a bidirectional armored winding layer 5, and an outer sheath 6. The conductor assembly 1 is composed of multiple mutually insulated sub-conductors twisted together, each sub-conductor including a copper wire core and a polyimide film 2 wrapped around the copper wire core. The inner sheath 4 is made of polyetheretherketone (PEEK) material extruded onto the outside of the cabled conductor assembly 1. An insulation layer 3 is wrapped around the outside of the polyimide film 2, and the insulation layer 3 is made of high-temperature resistant rubber material. The inner sheath 4 is a high-temperature fluoroplastic sheath. This structural combination allows the cable to achieve effective insulation during oil extraction and to initially resist the influence of the external high-temperature environment on the internal components.

[0029] Please see Figures 2 to 4 The bidirectional armored winding layer 5 is composed of at least one left-winding first winding layer 51 and at least one right-winding second winding layer 52. Both the first winding layer 51 and the second winding layer 52 are formed by winding stainless steel wire. The diameter of the stainless steel wire used in the first winding layer 51 is 1.20 mm, and the diameter of the stainless steel wire used in the second winding layer 52 is 1.40 mm. The bidirectional winding design, combined with the characteristics of stainless steel, can significantly enhance the tensile strength and structural stability of the cable, and better cope with the external force pulling during mining.

[0030] Please see Figure 1 The copper wire core has a diameter of 4.1 mm, and the continuous length of a single cable is no less than 7000 meters. The polyimide film 2 is extruded from polyetheretherketone or polyphenylene sulfide, and the outer sheath 6 is made of high-temperature resistant polyethylene. The appropriate material selection gives the cable good high-temperature resistance and conductivity, and the longer continuous length also reduces connection points and lowers the probability of failure during use.

[0031] The implementation principle of a high-temperature resistant armored cable in this application embodiment is as follows:

[0032] First, conductor assembly 1 undertakes the core task of power transmission: its internal copper wire core, with its excellent conductivity, stably transmits external power to the oil extraction equipment, while the outer polyimide film 2 achieves insulation isolation between multiple sub-conductors, preventing current leakage from causing short circuits or equipment failures.

[0033] Secondly, the insulation layer 3 further enhances the insulation protection: the high-temperature resistant rubber material wrapped around the polyimide film 2 can maintain stable insulation performance in the high-temperature environment of oil extraction wells, making up for the potential shortcomings of the insulation effect of the polyimide film 2 and reducing the risk of insulation failure due to high temperature. Next, the inner sheath layer 4 plays a role in internal structural protection and high-temperature resistance: it is made of polyetheretherketone or high-temperature fluoroplastic extruded around the conductor assembly 1. On the one hand, it can buffer external impacts and prevent the conductor assembly 1 from being damaged by collision and friction; on the other hand, its high-temperature resistance is suitable for the high-temperature working conditions in wells, and it also has insulation properties to avoid current interference between the internal and external structures.

[0034] Next, the bidirectional armored winding layer 5 resists external forces and ensures structural stability: it consists of a first winding layer 51 on the left and a second winding layer 52 on the right. The bidirectional winding design greatly improves the overall tensile strength and wear resistance of the cable, and can resist the stretching, dragging and friction of the well wall during oil extraction, preventing the cable from breaking or deforming due to external forces.

[0035] Finally, the outermost layer 6 provides isolation and protection from the external environment: as the outermost layer, the high-temperature resistant polyethylene material can effectively isolate corrosive or destructive substances such as oil, downhole water vapor, and silt, preventing internal structures from being corroded or contaminated. At the same time, it can withstand high environmental temperatures, ensuring that the cable as a whole can work stably for a long time in complex mining environments.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high temperature resistant armored cable, characterized in that, It includes a conductor assembly (1), an inner sheath (4), a bidirectional armored winding layer (5), and an outer sheath (6) arranged sequentially from the inside to the outside. The conductor assembly (1) is formed by twisting together multiple mutually insulated sub-conductors. Each sub-conductor includes a copper wire core and a polyimide film (2) wrapped around the copper wire core. The inner sheath (4) is extruded from polyetheretherketone material onto the outside of the conductor assembly (1) after cabling. The bidirectional armored winding layer (5) is composed of at least one left-winding first winding layer (51) and at least one right-winding second winding layer (52). Both the first winding layer (51) and the second winding layer (52) are formed by winding stainless steel wire made of stainless steel.

2. A high temperature resistant armored cable according to claim 1, characterized in that: The stainless steel wire used in the first winding layer (51) has a diameter of 1.20 mm, and the stainless steel wire used in the second winding layer (52) has a diameter of 1.40 mm.

3. The high temperature resistant armored cable of claim 1, wherein: The inner sheath (4) is a high-temperature fluoroplastic sheath.

4. The high-temperature resistant armored cable according to claim 1, characterized in that: The diameter of the copper wire core is 4.1 mm.

5. The high temperature resistant armored cable of claim 1, wherein: The continuous length of a single cable shall not be less than 7,000 meters.

6. The high temperature resistant armored cable of claim 1, wherein: The polyimide film (2) is extruded from polyether ether ketone or polyphenylene sulfide material.

7. The high temperature resistant armored cable of claim 1, wherein: The outer sheath (6) is made of high-temperature resistant polyethylene material.

8. The high-temperature resistant armored cable according to claim 1, characterized in that: The polyimide film (2) is wrapped with an insulating layer (3), which is made of high-temperature resistant rubber material.

Images