A high-strength load-bearing detection cable that prevents water vapor from entering the cable

Abstract

The present invention relates to the technical field of load detection cables, and proposes a high-strength load detection cable that prevents water vapor from entering the cable. A plurality of wire cores are twisted together to form a cable core; a carbon fiber filler is filled in the gaps between adjacent wire cores, and the carbon fiber filler and the cable core form a cylindrical core structure; a carbon fiber braided layer is woven from carbon fiber wires and is sleeved on the periphery of the cylindrical core structure; an inner armor layer is an annular steel ring structure, sleeved on the periphery of the carbon fiber braided layer, and a plurality of inner steel wires are overlapped in sequence along the ring to form an annular steel ring structure; an outer armor layer is sleeved on the periphery of the inner armor layer, and the outer armor layer includes a plurality of twisted outer steel wires; a sealing layer is filled in the gap between the outer armor layer and the periphery of the inner armor layer. Through the above technical scheme, the problems of low sealing performance, tensile strength, high temperature resistance, and magnetic field interference resistance of the load detection cable are solved.

Description

Technical Field

[0001] The invention relates to the technical field of load-bearing detection cables, and in particular to a high-strength load-bearing detection cable that is resistant to water vapor cross-contamination. Background Art

[0002] The load-bearing detection cable is used for hoisting test instruments and can also transmit signals for underground logging operations.

[0003] In the existing ultra-deep well load-bearing detection cables of more than 10,000 meters, the gap between the steel wires of the inner and outer armor layers is large, resulting in poor sealing of the overall cable, prone to air and water cross-talk problems, poor corrosion resistance, and low overall tensile strength. At the same time, the temperature resistance of general detection cables cannot adapt to the high temperature environment of 260°C in ultra-deep wells, and the ability to resist external magnetic field interference needs to be further improved to obtain a more stable user experience.

[0004] In order to adapt to the harsh environment of ultra-deep wells over 10,000 meters, it is necessary to solve the problems of low sealing performance, tensile strength, high temperature resistance, and resistance to magnetic field interference of the load-bearing detection cable. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high-strength load-bearing detection cable that is anti-water vapor infiltration in response to the above-mentioned technical deficiencies, which solves the problems of low sealing performance, tensile strength, high temperature resistance and anti-magnetic field interference ability of the load-bearing detection cable.

[0006] The technical solution adopted by the present invention is: to provide a high-strength load-bearing detection cable that prevents water vapor from entering the cable, comprising a plurality of copper strands twisted together and a core coated with an insulating layer on the periphery, wherein the plurality of cores are twisted together to form a cable core, and the cable core is characterized in that it also includes:

[0007] A carbon fiber filler is filled in the gap between adjacent cable cores, wherein the carbon fiber filler and the cable core form a cylindrical core structure;

[0008] A carbon fiber braided layer, woven from carbon fiber filaments, is sleeved around the cylindrical core structure;

[0009] The inner armor layer is an annular steel ring structure, which is sleeved on the outer periphery of the carbon fiber braided layer. The inner armor layer includes a plurality of twisted inner steel wires, and the plurality of inner steel wires are overlapped in sequence along the ring to form an annular steel ring structure;

[0010] An outer armor layer, which is sleeved around the inner armor layer, and the outer armor layer includes a plurality of twisted outer steel wires, and the outer steel wires are cylindrical;

[0011] The sealing layer fills the gap between the outer armor layer and the periphery of the inner armor layer.

[0012] To further optimize the technical solution, the insulating layer is a double-layer composite structure, including an inner PFA material layer and an outer X-ETFE material layer.

[0013] To further optimize the technical solution, the copper stranded wire is a silver-plated copper wire, seven of the silver-plated copper wires are twisted together to form a conductor, the conductor is coated with the insulating layer, and the twisting direction is left-handed.

[0014] To further optimize the technical solution, the seven wire cores are rounded into a cable core according to a 1+6 concentric structure.

[0015] To further optimize the technical solution, the cross-section of the inner layer steel wire is fan-shaped.

[0016] To further optimize the technical solution, the blocking layer is a blocking sealant with a temperature resistance of 500° C. and above, or the blocking layer is a fluoroplastic sheath.

[0017] To further optimize the technical solution, the outer layer steel wire material is made of 2600MPa zinc-aluminum alloy steel wire, and the armor coating density of the outer armor layer is not less than 98.5%.

[0018] To further optimize the technical solution, the inner layer steel wire is made of 2600MPa zinc-aluminum alloy steel wire.

[0019] The beneficial effects of the present invention are:

[0020] 1. Carbon fiber has excellent electrical and thermal conductivity, and its tensile strength is more than three times that of steel wire with the same diameter, and it has good water resistance. Carbon fiber fillers and carbon fiber braided layers can protect the cable core from being round and tight while also withstanding high ambient temperatures. At the same time, it can also play a role in sealing and preventing air and water from leaking, and protecting the cable core from being squeezed, bumped, and damaged, enhancing the overall tensile strength, and increasing the cable's ability to resist external magnetic field interference, effectively increasing the stability of transmission. At the same time, the thermal stability and thermal conductivity of carbon fiber are more suitable for the high temperature environment of 260°C in ultra-deep wells.

[0021] 2. The inner layer of steel wires is overlapped to form a ring-shaped steel ring structure with high density, which increases the ability to protect the cable core, provides a solid foundation for the outer armor layer, and reduces the elongation. When the cable is lowered into the well, especially in ultra-deep wells of more than 10,000 meters, the overall elongation of the cable is kept below 0.1%, which effectively reduces the error of measuring the depth underground.

[0022] 3. The inner armor layer, carbon fiber filler, carbon fiber braided layer, and plugging layer of the annular steel ring structure as a sealing structure all improve the overall sealing performance. Compared with traditional products, it can effectively reduce the corrosion of the inner and outer steel wires in the harsh environment of ultra-deep wells, greatly reduce the attenuation cycle of the tensile strength value, and effectively increase the life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Explanation of markings in the figure: 1. Conductor; 2. Insulation layer; 3. Carbon fiber filler; 4. Carbon fiber braided layer; 5. Inner armor layer; 501. Inner steel wire; 6. Outer armor layer; 601. Outer steel wire; 7. Sealing layer. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0027] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] like Figure 1As shown, a high-strength load-bearing detection cable for preventing water vapor from entering the cable comprises a plurality of copper strands twisted together and coated with an insulating layer 2 on the periphery, wherein the plurality of cores are twisted together to form a cable core, and the cable core is characterized in that the cable core further comprises: a carbon fiber filler 3 filled in the gaps between adjacent cores, wherein the carbon fiber filler 3 and the cable core constitute a cylindrical core structure; a carbon fiber braided layer 4 woven from carbon fiber filaments and sleeved on the periphery of the cylindrical core structure; an inner armor layer 5 which is an annular steel ring structure sleeved on the periphery of the carbon fiber braided layer 4, wherein the inner armor layer 5 comprises a plurality of twisted inner steel wires 501, wherein the plurality of inner steel wires 501 are overlapped in sequence along the ring to form an annular steel ring structure; an outer armor layer 6 sleeved on the periphery of the inner armor layer 5, wherein the outer armor layer 6 comprises a plurality of twisted outer steel wires 601, wherein the outer steel wires 601 are cylindrical; and a sealing layer 7 which fills the gap between the outer armor layer 6 and the periphery of the inner armor layer 5. The copper stranded wire is a silver-plated copper wire. Seven of the silver-plated copper wires are twisted together to form a conductor 1. The conductor 1 is covered with the insulating layer 2, and the twisting direction is left-handed. The seven wire cores are rounded according to the concentric structure of 1+6 to form a cable core. The cross-section of the inner steel wire 501 is a fan-shaped ring. The outer steel wire 601 is made of 2600MPa zinc-aluminum alloy steel wire, and the armor coating density of the outer armor layer 6 is not less than 98.5%. The inner steel wire 501 is made of 2600MPa zinc-aluminum alloy steel wire.

[0030] When in use, the wire core includes a conductor 1, which is formed by twisting seven silver-plated copper wires, and includes an insulating layer 2 wrapped around the conductor 1. The seven wire cores are twisted and rounded according to a concentric structure of 1+6 to form a cable core. The concentric structure of 1+6 is a prior art, that is, one wire at the middle axis and six wires equally divided around the periphery. The gaps between the conductors 1 can be narrowed and sealed by a rolling pressing process to reduce air and water crosstalk. In the cable core, there are gaps between adjacent wire cores, and carbon fiber fillers 3 are used to fill the gaps between the wire cores, and the six wire cores wrapped around the periphery form a cylindrical core structure, and then a carbon fiber braided layer 4 is used to set and tie outside the cylindrical core structure, which protects the roundness and compactness of the cable core while also being able to withstand high environmental temperatures. In the wire core, the copper strands are tightly twisted, and the insulating layer 2 is tightly fitted with the copper strands, reducing air and water crosstalk between the copper strands and between the copper strands and the insulating layer 2.

[0031] The carbon fiber filler 3 and the carbon fiber braided layer 4 are both made of carbon fiber material, which can enhance the overall tensile strength and increase the cable's ability to resist external magnetic field interference, effectively increasing the stability of transmission. The carbon fiber braided layer 4 can be a mesh structure woven from carbon fiber material, which is wrapped around and tied outside the cable core to make the cable core tighter.

[0032] The materials of the inner steel wire 501 and the outer steel wire 601 can both be made of 2600MPa zinc-aluminum alloy steel wire, which has ultra-high strength. Among them, the inner steel wire 501 can be made of zinc-aluminum alloy steel wire through a special-shaped die rolling process to form a special shape, such as a fan ring, and then the twisting equipment armors the special-shaped steel wire to the outside of the carbon fiber braided layer 4. The inner steel wires 501 overlap each other, and the inner armor layer 5 is a tight ring-shaped steel ring structure, which increases the space area of ​​the ring and can increase the tensile bearing capacity by about 28% compared to the round steel wire. When subjected to external pressure, the gap is tightened to form an overall closed structure. The outer steel wire 601 is cylindrical and uses two layers of ultra-high strength 2600MPa zinc-aluminum alloy steel wire armor of different shapes. The breaking force reaches 33,000 pounds, which is 35% higher than traditional products. The inner armor layer 5 adopts an annular steel ring structure, and the outer layer adopts a plurality of cylindrical steel wire armors on the outside of the inner armor layer 5, which can better fasten and protect the steel ring structure and improve the sealing stability. Compared with the traditional steel ring structure setting the outermost layer, it is a significant improvement.

[0033] The sealing layer 7 can be made of high temperature resistant material to improve the overall high temperature resistance. At the same time, the sealing layer 7 makes the steel ring structure more compact, which helps to improve the sealing performance.

[0034] Furthermore, the insulating layer 2 is a double-layer composite structure, including an inner PFA material layer and an outer X-ETFE material layer.

[0035] When in use, the insulation layer 2 adopts a double-layer composite structure, which can greatly improve the insulation performance, and the high-temperature resistant PFA and X-ETFE high-quality fluoroplastics are selected to improve the high-temperature resistance. The double-layer insulation design can ensure that the cable can be used normally in the temperature range of -50 to 260°C without cracking. It can withstand high and low temperature weathering and corrosion.

[0036] Furthermore, the blocking layer 7 is a blocking sealant with a temperature resistance of 500° C. or above, or the blocking layer 7 is a fluoroplastic sheath.

[0037] When in use, a sealing sealant with a temperature resistance of 500°C can be coated on the outer periphery of the inner armor layer 5, or a fluoroplastic sheath can be extruded to fill the gaps between the steel wires to ensure the lateral integral closed structure of the inner armor layer 5 under high temperature and high pressure.

[0038] The product structure size can be set according to the actual situation, and the following sizes can be used (only for example, not to be considered as the size limit of this detection cable):

[0039] 1. Silver-plated compressed conductor: 7 0.34mm (0.65mm 2) diameter 0.96±0.01mm; 2. Fluoroplastic PFA insulation: thickness 0.32mm, diameter 1.60±0.04mm; 3. Fluoroplastic X-ETFE insulation: thickness 0.40mm, diameter 2.40±0.04mm; 4. Seven-core cable twisted: diameter 7.20±0.1mm; 5. Carbon fiber braided layer: diameter 7.50±0.1mm; 6. Inner layer of special-shaped steel wire and inner armor layer: 22 pieces × 1.11×1.26mm, diameter 9.50±0.10mm; 7. Outer round steel wire and outer armor layer: 22 pieces × 1.44mm, diameter 12.40+0.40mm.

[0040] The product technical indicators can reach:

[0041] 1. DC resistance of conductor at 20℃: ≤27Ω / km; 2. Insulation resistance of conductor at 20℃: ≥2000MΩ•km; 3. Cable withstand voltage test: 1200V / 5min without breakdown between conductive core and steel wire; 4. Capacitance: ≤150 PF / m between conductive core and steel wire at 1kHz; 5. Cable breaking force: ≥150kN; 6. Cable temperature resistance: -50~260℃; 7. Cable elongation: ≤0.10%.

[0042] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A high-strength load-bearing detection cable that prevents water vapor from entering the cable, comprising a plurality of copper strands twisted together and coated with an insulating layer (2) on the periphery, wherein the plurality of cores are twisted together to form a cable core, characterized in that: Also includes: A carbon fiber filler (3) is filled in the gap between adjacent cable cores, wherein the carbon fiber filler (3) and the cable core form a cylindrical core structure; A carbon fiber braided layer (4), braided from carbon fiber filaments, and sleeved around the outer periphery of the cylindrical core structure; The inner armor layer (5) is an annular steel ring structure, which is sleeved on the outer periphery of the carbon fiber braided layer (4), and the inner armor layer (5) comprises a plurality of twisted inner layer steel wires (501), and the plurality of inner layer steel wires (501) are overlapped in sequence along the ring to form the annular steel ring structure; An outer armor layer (6) is sleeved on the outer periphery of the inner armor layer (5), wherein the outer armor layer (6) comprises a plurality of twisted outer steel wires (601), and the outer steel wires (601) are cylindrical; A sealing layer (7) filling the gap between the outer armor layer (6) and the periphery of the inner armor layer (5); The insulating layer (2) is a double-layer composite structure, comprising an inner PFA material layer and an outer X-ETFE material layer; The cross section of the inner layer steel wire (501) is a fan ring; The blocking layer (7) is a blocking sealant with a temperature resistance of 500° C. or above, or the blocking layer (7) is a fluoroplastic sheath; The material of the outer layer steel wire (601) is 2600MPa zinc-aluminum alloy steel wire, and the armor coating density of the outer armor layer (6) is not less than 98.5%; The inner layer steel wire (501) is made of 2600MPa zinc-aluminum alloy steel wire.

2. A high-strength load-bearing detection cable for preventing water vapor from entering the body according to claim 1, characterized in that: The copper stranded wire is a silver-plated copper wire. Seven of the silver-plated copper wires are twisted together to form a conductor (1). The conductor (1) is covered with the insulating layer (2) on its periphery, and the twisting direction is left-handed.

3. The high-strength load-bearing detection cable for preventing water vapor from entering the body according to claim 1, characterized in that: The seven cores are rounded into a cable core according to a 1+6 concentric structure.

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