High-temperature-resistant anti-interference signal cable for coal bed gas rodless gas production equipment
Through multi-layer structural design and material selection, the problem of short service life of underground cables in coalbed methane wells under high temperature, high pressure and electromagnetic interference has been solved, and the long-term stability and reliability of cables under harsh working conditions have been achieved.
Patent Information
- Application Number
- CN202511999956.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-02-13
AI Technical Summary
Existing coalbed methane well cables have short service life and high failure rate under harsh conditions such as high temperature and high pressure, corrosive media, mechanical stress and electromagnetic interference, which affects production efficiency.
The cable adopts a multi-layer structure design consisting of twisted pairs, sub-shielding layers, main shielding layers, inner sheaths, armor layers, and outer sheaths. It uses polytetrafluoroethylene propylene insulation, fluororubber inner sheaths, steel wire braided shielding layers, and armor layers, combined with tin-plated conductors and polyurethane outer sheaths to enhance the cable's high temperature resistance, interference resistance, and mechanical properties.
It operates stably in high-temperature environments above 150°C, possesses excellent tensile and compressive strength, effectively resists electromagnetic interference, extends service life, and ensures the accuracy and stability of signal transmission.
Smart Images
Figure CN121528636A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a cable, in particular to a high-temperature-resistant, high-mechanical-energy, strong anti-interference and reliable high-temperature-resistant anti-interference signal cable for coalbed methane rodless gas extraction equipment. BACKGROUND
[0002] Coalbed methane (gas) extraction is an important energy field, and rodless gas extraction technology (such as linear motor pumping system) is widely used due to its high efficiency and strong adaptability. This technology relies on downhole sensors and control systems, and requires power transmission and data communication through special cables. At present, such cables often face the following problems in downhole applications: high temperature and high pressure: the downhole temperature of coalbed methane wells is high (up to 90°C or more), and the pressure is large, so the insulation and sheath materials of ordinary cables are prone to aging and deformation, resulting in a decrease in insulation performance or even breakdown. Medium corrosion: there may be corrosive media such as H2S, CO2, and water in the downhole, which can corrode metal components and sheaths. Mechanical stress: the cable needs to be frequently raised and lowered with the pump cylinder or be in a stretched state for a long time, and the traditional structure is prone to conductor breakage and sheath wear. Electromagnetic interference: strong electromagnetic interference is generated by high-power motors, frequency converters and other equipment in the downhole, which seriously affects the transmission quality and stability of weak electrical signals. Signal attenuation: long-distance transmission (over 1000 meters) results in serious signal attenuation, and control signals and monitoring data are distorted.
[0003] The cable structure of the prior art is simple and does not comprehensively consider the above harsh working conditions, resulting in a short service life, a high failure rate, and a serious impact on production efficiency. Therefore, it is necessary to propose an improvement to overcome the defects of the prior art. SUMMARY
[0004] The purpose of the present application is to solve the problems in the prior art and provide a high-temperature-resistant, high-mechanical-energy, strong anti-interference and reliable high-temperature-resistant anti-interference signal cable for coalbed methane rodless gas extraction equipment.
[0005] The technical scheme of the present application is: a kind of high temperature resistant anti-interference signal cable for coal bed gas rodless gas recovery equipment, including twisted pair wire group, sub-shielding layer, total shielding layer, inner sheath, armored layer and outer sheath;The twisted pair wire group includes one or more pairs of wires, and the one or more pairs of wires are twisted into twisted pair wire group two by two;The wire includes conductor core wire and insulating layer wrapped outside the conductor core wire, the conductor core wire is twisted by multiple strands of oxygen-free copper wire, and the insulating layer is polytetrafluoroethylene material;The twisted pair wire group is wrapped with sub-shielding layer outside, and the sub-shielding layer includes aluminum foil layer and copper wire braid layer;Multiple twisted pair wire groups wrapped with the sub-shielding layer are twisted into cable, and the cable is wrapped with total shielding layer outside, and the total shielding layer is steel wire braided shielding layer;The total shielding layer is wrapped with inner sheath outside, and the inner sheath is fluorine rubber material;The inner sheath is wrapped with armored layer outside, and the armored layer is steel wire armored layer;The armored layer is wrapped with outer sheath outside, and the outer sheath is polyurethane elastomer material.
[0006] As a preferred technical scheme, the gap between the total shielding layer and the cable is filled with water-blocking filler.
[0007] As a further preferred technical scheme, the water-blocking filler is inorganic water-blocking yarn or glass fiber rope.
[0008] As a preferred technical scheme, the core wire twisted by multiple strands of oxygen-free copper wire is plated with a tin layer on the surface.
[0009] As a preferred technical scheme, the twisted pair wire group is twisted by wires at a pitch, and the twisted pitch is not greater than 100 mm.
[0010] As a preferred technical scheme, the aluminum foil layer of the sub-shielding layer has a thickness of ≥0.05 mm.
[0011] As a preferred technical scheme, the copper wire braid layer of the sub-shielding layer is a tin-plated copper wire braid layer, and the braid density is ≥85%.
[0012] As a preferred technical scheme, the steel wire braided shielding layer of the total shielding layer is a zinc-plated steel wire braided shielding layer.
[0013] As a preferred technical scheme, the armored layer includes a double-layer steel wire armored layer, which is formed by reverse winding of double-layer steel wires.
[0014] As a preferred technical scheme, the steel wire armored layer material is zinc-plated steel wire.
[0015] The high-temperature-resistant anti-interference signal cable for the coal bed gas rodless gas extraction equipment has the advantages of solid structure, high-temperature resistance, anti-interference, stable transmission and long service life. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 The high-temperature-resistant anti-interference signal cable for the coal bed gas rodless gas extraction equipment has the advantages of solid structure, high-temperature resistance, anti-interference, stable transmission and long service life. DETAILED DESCRIPTION
[0017] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0018] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.
[0019] It should be understood that the term "and / or" used herein only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.
[0020] Depending on the context, the words "if", "when" as used herein can be interpreted as "upon", "when", or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (a stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (a stated condition or event)" or "in response to detecting (a stated condition or event)".
[0021] It is also important to note that the terms "comprises" and / or "comprising," when used in this specification, mean "including but not limited to," and do not exclude other moieties, additives, components, integers or steps.
[0022] As Figure 1 A high-temperature-resistant anti-interference signal cable for coal-bed gas rodless recovery equipment is shown in the specific embodiment of the present application. The high-temperature-resistant anti-interference signal cable for coal-bed gas rodless recovery equipment in the embodiment comprises a pair of twisted wire groups 3, a partial shielding layer 4, a total shielding layer 6, an inner sheath 7, an armored layer 8 and an outer sheath 9. Among them: The pair of twisted wire groups 3 comprises one or more pairs of wires, and the one or more pairs of wires are twisted in pairs to form the pair of twisted wire groups. The wires comprise a conductor core wire 1 and an insulating layer 2 covering the conductor core wire. The conductor core wire 1 is twisted by a plurality of oxygen-free copper wires, and the insulating layer 2 is made of polytetrafluoroethylene material. The pair of twisted wire groups 3 is covered with the partial shielding layer 4, and the partial shielding layer 4 comprises an aluminum foil layer and a copper wire braided mesh layer. A plurality of the pair of twisted wire groups covered with the partial shielding layer 4 are twisted into a cable, and the cable is covered with the total shielding layer 6 outside. The total shielding layer 6 is a steel wire braided shielding layer. The total shielding layer 6 is covered with the inner sheath 7 outside, and the inner sheath 7 is made of fluororubber material. The inner sheath 7 is covered with the armored layer 8 outside, and the armored layer 8 is a steel wire armored layer. The armored layer 8 is covered with the outer sheath 9 outside, and the outer sheath 9 is made of polyurethane elastomer material.
[0023] In the embodiment, the conductor core wire 1 is plated with a tin layer, and the conductor core wire 1 twisted by a plurality of ultrafine oxygen-free copper wires is combined with the tin plating treatment to effectively enhance the oxidation resistance and corrosion resistance, thereby ensuring the flexibility and bending resistance of the cable.
[0024] The insulating layer 2 is extruded on each conductor core wire 1 by using high-temperature-resistant polytetrafluoroethylene (FEP) material. The FEP material has the characteristics of high long-term working temperature (200°C), stable dielectric constant and good flame resistance, which can effectively ensure the insulation reliability under high temperature.
[0025] The pair of twisted wire groups 3 twisted in pairs by one or more pairs of wires has a pitch twisting mode, and the pitch twisting pitch is not greater than 100 mm, which can effectively suppress common mode interference and improve the signal anti-interference capability.
[0026] The partial shielding layer 4 is an aluminum foil layer and a copper wire braid layer wrapped outside each twisted pair group, wherein the aluminum foil layer is an aluminum foil Mylar tape layer with a thickness of ≥0.05 mm, and the copper wire braid layer is a tinned copper wire braid layer with a weaving density of ≥85%; the independent shielding of each group of signals is realized.
[0027] The total shielding layer 6 is a high-strength galvanized steel wire braid shielding layer wrapped on the cable after the multiple groups of the twisted pair lines wrapped with the partial shielding layer 4 are twisted into a cable. This layer not only provides excellent electromagnetic shielding effect (shielding efficiency ≥90%), but also greatly enhances the overall tensile strength and compression resistance of the cable.
[0028] In this embodiment, the gap between the total shielding layer 6 and the cable is filled with a water-blocking filler 5, which is inorganic water-blocking yarn or glass fiber rope, which not only ensures the compactness of the structure, but also plays a role in flame retardation, heat insulation and auxiliary tensile resistance.
[0029] The total shielding layer 6 is extruded and wrapped with an inner sheath 7 made of fluororubber material, which plays a role in fixing the shielding layer, buffering mechanical stress, further enhancing the overall heat resistance and air tightness.
[0030] The armor layer 8 is a double-layer steel wire armor layer, and the specific material is galvanized steel wire. The armor layer 8 adopts a double-layer high-strength galvanized steel wire reverse winding armor structure, and the armor layer 8 is the force core layer, which provides extremely high mechanical strength and bears the huge tension and possible mechanical impact in the well.
[0031] The outer sheath 9 is formed by extruding polyurethane elastomer material, and the outer sheath 9 is extremely wear-resistant, oil-resistant, hydrolysis-resistant, tear-resistant, and can adapt to the complex chemical environment in the well, providing the final protection for the cable.
[0032] The high-temperature-resistant anti-interference signal cable for coalbed methane rodless gas recovery equipment of the embodiment is prepared by twisting oxygen-free copper wire bundles, and a tin layer is plated on the surface to improve the oxidation resistance and corrosion resistance. The conductor core wire 1 is coated with an insulating layer 2 made of FEP material; the insulating layer 2 is twisted in pairs to form a twisted pair wire group 3 with a twisted pair pitch of not greater than 100 mm; the twisted pair wire group 3 is coated with a partial shielding layer 4 composed of an aluminum foil and a copper wire braid mesh, the aluminum foil has a thickness of not less than 0.05 mm, and the copper wire braid has a density of not less than 85%, and the double-layer shielding structure ensures the anti-interference capability; a plurality of partial shielding layers 4 are twisted to form a cable, and the cable gap is filled with a water-blocking filler 5 to round off. The cable is coated with a total shielding layer 6 with a total shielding density of not less than 90%. The total shielding layer 6 is extruded with an inner sheath 7 made of fluororubber material, and the inner sheath is coated with a double-layer steel wire armor layer 8, which gives the cable high tensile strength and pressure resistance. The armor layer 8 is coated with a polyurethane outer sheath 9, which is extremely wear-resistant, oil-resistant, hydrolysis-resistant, and tear-resistant, and can adapt to the complex chemical environment in the well to provide the final protection for the cable. The high-temperature-resistant anti-interference signal cable for coalbed methane rodless gas recovery equipment of the embodiment has excellent environmental resistance, tensile strength, and long-term electrical stability, and can be reused.
[0033] Compared with the prior art, the high-temperature-resistant anti-interference signal cable for coalbed methane rodless gas recovery equipment of the embodiment has the following remarkable advantages: 1. Excellent high-temperature resistance: the use of FEP insulation and fluororubber inner sheath enables the cable to work stably for a long time in a high-temperature environment of 150°C or above, far exceeding ordinary PVC or PE materials. 2. Strong mechanical properties: the unique double-steel wire reinforcement structure of “steel wire total shielding layer + steel wire armor layer” gives the cable high tensile strength and pressure resistance, and can withstand frequent lifting operations of the rodless gas recovery equipment. 3. Excellent interference resistance: the triple anti-interference design of “twisted pair + partial shielding + total shielding” can effectively resist strong electromagnetic interference in the well to ensure the accuracy and stability of signal transmission. 4. Excellent durability and reliability: the use of tin-plated conductors, fluororubber, and polyurethane sheaths enables the cable to have excellent corrosion resistance, oil resistance, wear resistance, and anti-aging properties, greatly extending the service life in harsh wells. 5. High signal transmission quality: stable insulation materials and shielding structures effectively reduce signal attenuation during long-distance transmission, ensuring the accuracy of data and control commands. 6. High process feasibility: the preparation method is mature and easy to realize large-scale industrial production.
[0034] To sum up, only the preferred embodiments of the present application are described above, and they are not used to limit the implementation scope of the present application. Any equivalent changes and modifications made according to the content of the patent application scope of the present application shall belong to the technical scope of the present application.
Claims
1. A high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device, characterized in that: It includes twisted pair, sub-shielding layer, main shielding layer, inner sheath, armor layer and outer sheath; The twisted pair assembly includes one or more pairs of conductors, which are twisted together in pairs to form the twisted pair assembly; the conductors include conductor cores and an insulating layer covering the conductor cores, the conductor cores are made of multiple strands of oxygen-free copper wires twisted together, and the insulating layer is made of perfluoroethylene propylene material; The twisted pair is covered with a sub-shielding layer, which includes an aluminum foil layer and a copper wire braided mesh layer. Multiple twisted pairs of wires covered with the sub-shielding layer are twisted together to form a cable, and the cable is covered with a total shielding layer, which is a steel wire braided shielding layer. The overall shielding layer is covered with an inner sheath, which is made of fluororubber material. The inner sheath is covered with an armor layer, which is a steel wire armor layer; The armor layer is covered by an outer sheath, which is made of polyurethane elastomer material.
2. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The gap between the main shielding layer and the cable is filled with a water-blocking filler.
3. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 2, characterized in that: The water-blocking filler is an inorganic water-blocking yarn or fiberglass rope.
4. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The core wire, which is formed by twisting together multiple strands of oxygen-free copper wire, is plated with a tin layer.
5. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The twisted pair assembly is formed by twisting conductors together at a pitch, with the twist pitch not exceeding 100mm.
6. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The thickness of the aluminum foil layer used for shielding is ≥0.05mm.
7. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The copper wire braided mesh layer of the shielding layer is a tin-plated copper wire braided mesh layer with a braiding density of ≥85%.
8. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The steel wire braided shielding layer of the overall shielding layer is a galvanized steel wire braided shielding layer.
9. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The armor layer includes a double-layer steel wire armor layer, which is formed by two layers of steel wires wound in opposite directions.
10. The high-temperature resistant and interference-resistant signal cable for a rodless coalbed methane extraction device according to claim 1, characterized in that: The so-called steel wire armor layer material is galvanized steel wire.