Signal transmission cable for deep well sensor

Abstract

The utility model provides a signal transmission cable for a deep well sensor, which comprises a plurality of conductive wire cores, the plurality of conductive wire cores are twisted in pairs to form a cable core, the outer surface of the cable core is provided with a sealing layer, the outer surface of the sealing layer is provided with an inner lining layer, the outer surface of the inner lining layer is provided with a tensile layer, and the tensile layer is provided with a sheath layer. An outer sheath is arranged on the outer surface of the tensile layer, and the conductive wire core comprises a cable conductor and an insulating layer arranged on the outer surface of the cable conductor; the beneficial effects of the utility model are that the cable employs a steel pipe sealing technology structure and a polyester woven tensile structure, thereby enabling the cable to be simple in structure, to be good in sealing effect, to be low in cost, to be light in weight, to be convenient to lay, etc. In addition, the cable core is wrapped by the stainless steel pipe, well liquid can be prevented from invading the cable core, the sealing effect is good, corrosion is prevented, and interference of an electromagnetic field of an external power cable on transmission signals in the signal line can be effectively isolated.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a signal transmission cable for a deep well sensor. Background Art

[0002] Downhole sensors play a vital role in mining production, exploration, and safety monitoring. These sensors can monitor various environmental parameters underground in real time, including temperature, gas concentration, rock density, seismic wave amplitude, pipeline pressure, and fluid flow rate, and transmit them to the ground control system in the form of signals, thereby accurately controlling the equipment for adjustment. The signal transmission cable used by downhole sensors is mainly used to transmit various environmental parameter data collected by the sensors to the uphole control system to ensure the accuracy and real-time nature of the data. When selecting downhole sensor signal cables, many factors need to be considered, such as corrosion resistance, tensile strength, wear resistance, signal transmission quality, electromagnetic interference, etc.

[0003] The signal transmission line tensile strength structure mainly used in existing downhole sensor cables is a double steel wire armor structure. This structure has strong load-bearing capacity and is anti-collision. It can be connected to the sensor alone for use, but this structure is heavy, expensive, and difficult to lay. In addition, downhole sensors are generally connected to the extraction equipment as a whole and bundled with the power cable, so they do not require excessive tensile strength. The existing downhole sensor signal transmission cable is directly derived from the downhole detection cable and adopts a double steel wire armor structure. It is expensive and difficult to lay, making it inconvenient to promote and use. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a signal transmission cable for deep well sensors, which is used to solve the problem that the cable structure in the prior art is a double steel wire armored structure, which is not only heavy and expensive, but also difficult to lay.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides the following technical solutions:

[0006] A signal transmission cable for deep-well sensors comprises a plurality of conductive cores, wherein the plurality of conductive cores are twisted into a cable to form a cable core, the outer surface of the cable core is provided with a sealing layer, the outer surface of the sealing layer is provided with an inner lining layer, the outer surface of the inner lining layer is provided with a tensile layer, and the outer surface of the tensile layer is provided with an outer sheath, wherein the conductive core comprises a cable conductor and an insulating layer arranged on the outer surface of the cable conductor; the cable core in this technical solution adopts a twisted structure, and the twist pitch is less than 12 times the outer diameter of the twist, thereby effectively reducing signal interference.

[0007] In one embodiment of the present invention, the cable conductor is made of electrical copper rods that are drawn and twisted, and the material used for the cable conductor includes but is not limited to the second type of tinned annealed copper.

[0008] In one embodiment of the present invention, polypropylene is extruded on the outer surface of the cable conductor to form an insulation layer, thereby forming the conductive core. The material used for the insulation layer includes but is not limited to polypropylene.

[0009] In one embodiment of the present invention, the material used for the sealing layer includes but is not limited to stainless steel, and polypropylene is extruded on the outer surface of the sealing layer to form an inner lining layer. The material used for the inner lining layer is but is not limited to polypropylene. The cable core in this technical solution is wrapped with a stainless steel tube, thereby preventing well fluid from invading the interior of the cable core and having a certain shielding effect. It not only has good sealing effect and corrosion resistance, but also has good anti-interference performance.

[0010] In one embodiment of the present invention, the tensile layer is woven with high-strength polyester yarn, and fluoroplastic is extruded on the outer surface of the tensile layer to form an outer sheath. The materials used for the outer sheath include but are not limited to fluoroplastic. The tensile layer in this technical solution is woven with high-strength polyester yarn, and the weaving density needs to be ≥90%, so that it has a strong tensile effect.

[0011] As described above, the signal transmission cable for deep well sensors of the present invention has the following beneficial effects:

[0012] The utility model adopts a steel tube sealing process structure + polyester braided tensile structure, which makes the utility model have the advantages of simple structure, good sealing effect, low price, light weight, and easy laying; the cable core is wrapped with a stainless steel tube, which can prevent well fluid from invading the interior of the cable core and can play a certain shielding effect. It not only has good sealing effect and corrosion resistance, but also can effectively isolate the electromagnetic field of the external power cable from interfering with the internal transmission signal of the signal line, thereby ensuring the stability and reliability of the signal; the tensile layer is woven with polyester high-strength silk, and the braiding density needs to be ≥90%, so it has a strong tensile effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Shown is a cross-sectional schematic diagram of a signal transmission cable for a deep well sensor disclosed in an embodiment of the present utility model.

[0014] Component number description

[0015] 1. Cable conductor; 2. Insulation layer; 3. Sealing layer; 4. Inner lining layer; 5. Tensile layer; 6. Outer sheath. DETAILED DESCRIPTION

[0016] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless there is a conflict.

[0017] See also Figure 1 The present invention provides a signal transmission cable for a deep well sensor, comprising a plurality of conductive cores, the conductive core comprising a cable conductor 1 and an insulating layer 2 arranged on the outer surface of the cable conductor 1, the cable conductor 1 being made by drawing and twisting an electrical copper rod, the material of the cable conductor 1 including but not limited to the second type of tinned annealed copper, the outer surface of the cable conductor 1 being extruded with polypropylene to form an insulating layer 2, thereby forming a conductive core, the material of the insulating layer 2 including but not limited to polypropylene; a plurality of conductive cores are twisted into a cable to form a cable core, wherein, in this embodiment, the number of conductive cores is two, two conductive cores of different colors are twisted into a cable to form a cable core, and the cable core adopts a twisted structure, and the twist pitch is less than 12 times the outer diameter of the twist, which can effectively reduce signal interference;

[0018] The outer surface of the cable core is provided with a sealing layer 3, and the material used for the sealing layer 3 includes but is not limited to stainless steel. The cable core is sealed and protected by a stainless steel tube, which not only has a good sealing effect, but also prevents external physical loss, chemical corrosion and moisture infiltration, enhances signal quality, and improves tensile strength and compressive resistance, thereby ensuring the integrity and stability of the signal line; the outer surface of the sealing layer 3 is provided with an inner lining layer 4, and polypropylene is extruded on the outer surface of the sealing layer 3 to form the inner lining layer 4, and the material used for the inner lining layer 4 includes but is not limited to polypropylene;

[0019] The outer surface of the inner lining layer 4 is provided with a tensile layer 5, wherein the tensile layer 5 is woven with high-strength polyester yarn, and the weaving density needs to be ≥90%, so that it has a strong tensile effect, and the overall tensile strength of the signal transmission cable is improved through the polyester yarn weaving process. The specific operation steps are as follows: select high-strength polyester yarn material, select the appropriate number of strands and roots according to the outer diameter of the inner lining, and then weave it with a weaving machine. The weaving density needs to be ≥90%, and the overall connection in the middle is not allowed to ensure a certain tensile resistance; the outer surface of the tensile layer 5 is provided with an outer sheath 6, and fluoroplastic is extruded on the outer surface of the tensile layer 5 to form an outer sheath 6. The materials used for the outer sheath 6 include but are not limited to fluoroplastic.

[0020] Specifically, the formation process of the signal transmission cable for deep-well sensors is as follows: first, electrical copper rods are drawn and twisted to form a cable conductor 1, and then polypropylene is extruded on the outside of the cable conductor 1 to form an insulating layer 2, thereby forming a conductive core. Two conductive cores of different colors are twisted into a cable to form a cable core, and then the entire cable core is inserted into a stainless steel tube for protection to achieve a sealed cable effect. Then, polypropylene is extruded on the outside of the stainless steel tube to form an inner lining layer 4. The outer surface of the inner lining layer 4 is a polyester woven tensile layer 5 that can bear a certain weight. Finally, fluoroplastic is extruded on the outer surface of the tensile layer 5 to form an outer sheath 6, thereby forming a signal transmission cable for deep-well sensors.

[0021] Furthermore, the utility model adopts stainless steel tube sealing, which provides extremely high mechanical strength, increases the tensile strength of the signal line, and enables the signal line to resist external physical impact, extrusion and wear, thereby extending the service life of the signal line. The steel pipe signal line has a good shielding effect on electromagnetic interference (EMI) and radio frequency (RFI), and can effectively isolate the electromagnetic field of the external power cable from interfering with the internal transmission signal of the signal line, thereby ensuring the stability and reliability of the signal; at the same time, the environmental performance of the signal transmission cable for the deep well sensor complies with the following requirements: cadmium and its compounds <100ppm; lead and its compounds <1000ppm; mercury and its compounds <1000ppm; hexavalent chromium compounds <1000ppm; polybrominated biphenyls (PBB) <1000ppm; polybrominated diphenyl ethers (PBDE) <1000ppm.

[0022] To sum up, the utility model adopts a steel tube sealing process structure + polyester braided tensile structure, so that the utility model has the advantages of simple structure, good sealing effect, low price, light weight, and easy laying; the cable core is wrapped with a stainless steel tube, which can prevent the well fluid from invading the inside of the cable core and can play a certain shielding effect. It not only has good sealing effect and corrosion resistance, but also can effectively isolate the electromagnetic field of the external power cable from interfering with the internal transmission signal of the signal line, thereby ensuring the stability and reliability of the signal; the tensile layer is woven with polyester high-strength yarn, and the braiding density needs to be ≥90%, so as to have a strong tensile effect; and the utility model is oil-resistant and corrosion-resistant, high-temperature resistant, anti-interference, tensile, high-pressure resistant, and has good water resistance. It has a light weight, is easy to install and recycle, and can meet the use of sensors in various environments in deep wells within 1000-3000 meters, solving the shortcomings of conventional sensor signal lines that are expensive, heavy, and troublesome to install, and provides the market with a product that is easy to install, cost-effective, and reliable.

[0023] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any equivalent modifications or variations made by persons skilled in the art without departing from the spirit and technical concepts disclosed herein shall be encompassed by the claims of the present invention.

Claims

1. Signal transmission cable for deep well sensors, characterized by: The invention comprises a plurality of conductive cores, wherein the plurality of conductive cores are twisted into a cable to form a cable core, wherein the outer surface of the cable core is provided with a sealing layer (3), the outer surface of the sealing layer (3) is provided with an inner lining layer (4), the outer surface of the inner lining layer (4) is provided with a tensile layer (5), and the outer surface of the tensile layer (5) is provided with an outer sheath (6), wherein the conductive core comprises a cable conductor (1) and an insulating layer (2) arranged on the outer surface of the cable conductor (1).

2. The signal transmission cable for deep well sensors according to claim 1, characterized in that: The cable conductor (1) is made of electrical copper rods that are drawn and twisted.

3. The signal transmission cable for deep well sensors according to claim 1, characterized in that: Polypropylene is extruded onto the outer surface of the cable conductor (1) to form an insulating layer (2), thereby forming the conductive core.

4. The signal transmission cable for deep well sensors according to claim 1, characterized in that: Polypropylene is extruded onto the outer surface of the sealing layer (3) to form an inner lining layer (4).

5. The signal transmission cable for deep well sensors according to claim 1, characterized in that: The tensile layer (5) is woven with polyester high-strength yarn, and fluoroplastic is extruded on the outer surface of the tensile layer (5) to form an outer sheath (6).

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