Steel pipe armored photoelectric composite cable

Abstract

The utility model discloses a steel pipe armored photoelectric composite cable, which comprises an optical fiber unit, at least one insulated conductor unit and an armored steel pipe, the optical fiber unit and the at least one insulated conductor unit are arranged in the armored steel pipe, and an optical fiber protection steel pipe is arranged on the outer side of the optical fiber unit. The outer side of each insulated conductor unit is provided with an insulated conductor protection steel pipe. According to the utility model, the insulating layer of the internal conductor can be prevented from being scalded when the outer-layer large-wall-thickness armored steel pipe is welded in the production process, so that the insulation integrity of the conductor is ensured, and the qualified rate of products is improved.

Description

Technical Field

[0001] The utility model relates to a photoelectric composite cable, in particular to a steel tube armored photoelectric composite cable, belonging to the technical field of cables. Background Art

[0002] Distributed fiber optic logging systems have been rapidly promoted and applied in the field of logging in recent years due to their advantages of anti-electromagnetic interference, high temperature resistance, high spatial resolution, fast measurement time, and high logging efficiency. In order to meet the monitoring of various physical quantities such as downhole temperature, pressure, and acoustic vibration, it is usually necessary to use distributed fiber optic sensing, electronic pressure gauges, and other methods for simultaneous monitoring. It is necessary to install sensing optical cables and electrical cables in oil and gas wells at the same time to meet the requirements of fiber optic sensing in the well, power supply for downhole instruments, and signal transmission. However, installing a sensing optical cable and an electrical cable at the same time in a wellbore with a small space is not only costly, but also complicated and difficult in the construction and installation process. Therefore, an optoelectronic composite cable is needed, which includes a sensing optical fiber and an electrical unit at the same time, meets the requirements of downhole optical fiber sensing and instrument power supply and signal transmission, and has the ability to resist high temperature, high pressure, and downhole environmental corrosion, and can resist various mechanical damages such as stretching, flattening, and impact during construction, and is easy to seal and easy to install for optoelectronic separation.

[0003] Commonly used underground sensing optical cables and electrical cables are all steel tube armored structures, which use steel tube armor to resist various mechanical external forces such as stretching and flattening during construction, as well as high pressure underground, to protect the internal optical fiber unit or insulated conductor. The outer diameter of the armored steel tube is usually 6.35mm, the wall thickness is 0.5-1.25mm, the inner hole diameter is 3-5mm, and it contains an optical fiber unit or an insulated conductor. If an optical fiber unit and an insulated conductor are set inside the armored steel tube to form an optoelectronic composite cable, in order to maintain the outer diameter of the thick-walled armored steel tube unchanged, the insulation layer of the insulated conductor must be thinned and the outer diameter must be reduced. However, after the insulation layer is thinned, its ability to resist external force flattening and high temperature burns decreases. When the optical cable is compressed and deformed, it is very easy to cause the insulation layer to be damaged, resulting in insulation failure. Moreover, since the insulation layer of the insulated conductor is in direct contact with the inner wall of the armored steel pipe, during the production process of the armored steel pipe, due to the thick armored steel pipe and high welding power, the welding slag splashed at the welding point and the high temperature generated can easily puncture or burn the insulation layer, causing insulation damage, forming a short circuit between the conductor and the armored steel pipe, or the withstand voltage and insulation resistance cannot meet the working requirements. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a steel tube armored photoelectric composite cable, which solves the problem that the photoelectric composite cable is easily damaged after the insulating layer is thinned during production and use.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A steel tube armored photoelectric composite cable comprises an optical fiber unit, at least one insulated conductor unit and an armored steel tube. The optical fiber unit and the at least one insulated conductor unit are arranged in the armored steel tube, an optical fiber protection steel tube is arranged outside the optical fiber unit, and an insulated conductor protection steel tube is arranged outside each insulated conductor unit.

[0007] Furthermore, the optical fiber unit comprises an optical fiber and an optical fiber protection steel tube, and a plurality of optical fibers are arranged in the optical fiber protection steel tube.

[0008] Furthermore, the optical fiber unit also includes fiber paste, which fills the gaps between the optical fibers in the optical fiber protection steel tube.

[0009] Furthermore, the number of the optical fibers is 1-6, and the coating layer of the optical fiber is an acrylate coating layer, a heat-resistant acrylate coating layer, a silicone coating layer or a polyimide coating layer.

[0010] Furthermore, a carbon-coated sealing layer is provided inside the optical fiber coating layer.

[0011] Furthermore, the insulated conductor unit comprises a conductor, an insulating layer and an insulated conductor protective steel pipe, the insulating layer is coated on the outside of the conductor, and the insulated conductor protective steel pipe is sleeved on the outside of the insulating layer.

[0012] Furthermore, the conductor is made of copper, tin-plated copper, nickel-plated copper or silver-plated copper, and the insulating layer is a high molecular polymer insulating material or a high temperature resistant inorganic insulating material.

[0013] Furthermore, the wall thickness of the optical fiber protection steel pipe and the insulated conductor protection steel pipe is 0.1-0.4mm, and the optical fiber protection steel pipe and the insulated conductor protection steel pipe are formed by longitudinally wrapping with metal strips and then continuously welding; the wall thickness of the armored steel pipe is 0.5-1.5mm, and the armored steel pipe is made of corrosion-resistant alloy, and the armored steel pipe is formed by longitudinally wrapping with metal strips and then continuously welding.

[0014] Furthermore, it also comprises a filling layer, which is filled in the gap between the optical fiber unit and at least one insulated conductor unit inside the armored steel pipe.

[0015] Furthermore, it also includes a packaging protective layer, which is coated on the outside of the armored steel pipe. The packaging protective layer is made of high-temperature resistant polymer material, and the cross-sectional shape of the packaging protective layer is circular or rectangular.

[0016] Compared with the prior art, the utility model has the following advantages and effects:

[0017] 1. A separate insulating conductor protection steel pipe is arranged on the outside of the insulated conductor unit of the utility model, which can prevent the insulation layer of the internal conductor from being burned during the welding of the outer thick-walled armored steel pipe during the production process, thereby ensuring the integrity of the conductor insulation and improving the qualified rate of the product;

[0018] 2. The insulated conductor unit and the optical fiber unit of the utility model are independently arranged and are respectively provided with steel pipe protection. The optical fiber unit and the insulated conductor unit are easy to separate, and the wiring is more convenient when connected with the downhole instrument;

[0019] 3. The utility model arranges steel pipe protection outside the insulating conductor unit and the optical fiber unit, thereby increasing the compressive resistance of the optoelectronic composite cable and the insulating conductor unit. When the optoelectronic composite cable is subjected to external pressure during use, the insulating layer is not easily crushed and broken, thereby increasing the compressive resistance and service life of the optoelectronic composite cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a steel tube armored photoelectric composite cable of the utility model.

[0021] Figure 2 It is a schematic diagram of the optical fiber unit of the utility model.

[0022] Figure 3 It is a schematic diagram of the insulated conductor unit of the utility model.

[0023] Figure 4 It is a schematic diagram of Example 2 of a steel tube armored photoelectric composite cable of the utility model.

[0024] Figure 5 It is a schematic diagram of Example 3 of a steel tube armored photoelectric composite cable of the utility model. DETAILED DESCRIPTION

[0025] In order to elaborate on the technical scheme adopted by the utility model to achieve the predetermined technical purpose, the technical scheme in the embodiment of the utility model will be clearly and completely described in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a partial embodiment of the utility model, not all of the embodiments, and the technical means or technical features in the embodiment of the utility model can be replaced without paying creative labor. The utility model will be described in detail with reference to the drawings and in combination with the embodiments.

[0026] Example 1.

[0027] like Figure 1As shown, a steel tube armored optoelectronic composite cable of the utility model comprises an optical fiber unit 1, an insulated conductor unit 2 and an armored steel tube 3. An optical fiber unit 1 and an insulated conductor unit 2 are arranged in the armored steel tube 3, an optical fiber protection steel tube is arranged on the outside of the optical fiber unit 1, and an insulated conductor protection steel tube is arranged on the outside of the insulated conductor unit 2.

[0028] like Figure 2 As shown, the optical fiber unit 1 includes an optical fiber 4 and an optical fiber protection steel tube 5, wherein a plurality of optical fibers 4 are arranged in the optical fiber protection steel tube 5. The optical fiber unit 1 further includes a fiber paste 6, which fills the gaps between the optical fibers 4 in the optical fiber protection steel tube 5.

[0029] The number of optical fibers 4 is 1-6, and the coating of the optical fiber 4 is an acrylate coating, a heat-resistant acrylate coating, a silicone coating or a polyimide coating. A carbon-coated sealing layer may be provided inside the optical fiber coating as required.

[0030] like Figure 3 As shown, the insulated conductor unit 2 includes a conductor 7, an insulating layer 8 and an insulated conductor protection steel tube 9. The insulating layer 8 is coated on the outside of the conductor 7, and the insulated conductor protection steel tube 9 is sleeved on the outside of the insulating layer 8.

[0031] The conductor 7 is made of copper, tinned copper, nickel-plated copper or silver-plated copper, and the insulating layer 8 is made of a polymer insulating material or a high-temperature resistant inorganic insulating material. The high-temperature resistant inorganic insulating material is glass fiber yarn, glass fiber tape or mica tape.

[0032] The wall thickness of the optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 is 0.1-0.4mm. The material of the optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 is metal material such as 304, 316L or 825. The optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 are formed by longitudinally wrapping with metal strips and then continuously welding, and have radial sealing properties.

[0033] The wall thickness of the armored steel pipe 3 is 0.5-1.5mm. The material of the armored steel pipe 3 is corrosion-resistant alloy such as 316L, 825, 625, 2205, 2507, etc. The armored steel pipe 3 is formed by longitudinally wrapping the metal strip and then continuously welding. It has radial sealing and can withstand an external pressure of not less than 70MPa.

[0034] The utility model of a steel tube armored photoelectric composite cable further comprises a filling layer 10, which is filled in the gap between the optical fiber unit 1 and an insulated conductor unit 2 inside the armored steel tube 3. After the optical fiber unit 1 and the insulated conductor unit 2 are parallel or twisted, the filling layer 10 is coated on the outside of the optical fiber unit 1 and the insulated conductor unit 2. The filling layer 10 is made of high molecular polymer materials such as high temperature resistant polypropylene, foamed high temperature resistant polypropylene, PVDF, FEP or foamed FEP, and its outer diameter is basically the same as the inner diameter of the armored steel tube 3. It is tightly filled in the armored steel tube 3 and the outside of the optical fiber unit 1 and the insulated conductor unit 2 to form a sealed filling layer with longitudinal sealing.

[0035] The utility model of a steel tube armored photoelectric composite cable further comprises an encapsulation protective layer 11, which is coated on the outside of the armored steel tube 3, and the encapsulation protective layer 11 is made of a high temperature resistant polymer material, and the high temperature resistant polymer material is PP, TPV, TPR, TPU, PVDF, Nylon, FEP, PFA or PEEK. The cross-sectional shape of the encapsulation protective layer 11 is rectangular.

[0036] Example 2.

[0037] like Figure 4 As shown, a steel tube armored optoelectronic composite cable of the utility model comprises an optical fiber unit 1, two insulated conductor units 2 and an armored steel tube 3. One optical fiber unit 1 and two insulated conductor units 2 are arranged in the armored steel tube 3, an optical fiber protection steel tube is arranged on the outside of the optical fiber unit 1, and an insulated conductor protection steel tube is arranged on the outside of each insulated conductor unit 2.

[0038] like Figure 2 As shown, the optical fiber unit 1 includes an optical fiber 4 and an optical fiber protection steel tube 5, wherein a plurality of optical fibers 4 are arranged in the optical fiber protection steel tube 5. The optical fiber unit 1 further includes a fiber paste 6, which fills the gaps between the optical fibers 4 in the optical fiber protection steel tube 5.

[0039] The number of optical fibers 4 is 1-6, and the coating of the optical fiber 4 is an acrylate coating, a heat-resistant acrylate coating, a silicone coating or a polyimide coating. A carbon-coated sealing layer may be provided inside the optical fiber coating as required.

[0040] like Figure 3 As shown, the insulated conductor unit 2 includes a conductor 7, an insulating layer 8 and an insulated conductor protection steel tube 9. The insulating layer 8 is coated on the outside of the conductor 7, and the insulated conductor protection steel tube 9 is sleeved on the outside of the insulating layer 8.

[0041] The conductor 7 is made of copper, tinned copper, nickel-plated copper or silver-plated copper, and the insulating layer 8 is made of a polymer insulating material or a high-temperature resistant inorganic insulating material. The high-temperature resistant inorganic insulating material is glass fiber yarn, glass fiber tape or mica tape.

[0042] The wall thickness of the optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 is 0.1-0.4mm. The material of the optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 is metal material such as 304, 316L or 825. The optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 are formed by longitudinally wrapping with metal strips and then continuously welding, and have radial sealing properties.

[0043] The wall thickness of the armored steel pipe 3 is 0.5-1.5mm. The material of the armored steel pipe 3 is corrosion-resistant alloy such as 316L, 825, 625, 2205, 2507, etc. The armored steel pipe 3 is formed by longitudinally wrapping the metal strip and then continuously welding. It has radial sealing and can withstand an external pressure of not less than 70MPa.

[0044] The utility model of a steel tube armored photoelectric composite cable further comprises an encapsulation protective layer 11, which is coated on the outside of the armored steel tube 3, and the encapsulation protective layer 11 is made of a high temperature resistant polymer material, and the high temperature resistant polymer material is PP, TPV, TPR, TPU, PVDF, Nylon, FEP, PFA or PEEK. The cross-sectional shape of the encapsulation protective layer 11 is rectangular.

[0045] Example 3.

[0046] like Figure 5 As shown, a steel tube armored optoelectronic composite cable of the utility model comprises an optical fiber unit 1, an insulated conductor unit 2 and an armored steel tube 3. An optical fiber unit 1 and an insulated conductor unit 2 are arranged in the armored steel tube 3, an optical fiber protection steel tube is arranged on the outside of the optical fiber unit 1, and an insulated conductor protection steel tube is arranged on the outside of the insulated conductor unit 2.

[0047] like Figure 2 As shown, the optical fiber unit 1 includes an optical fiber 4 and an optical fiber protection steel tube 5, wherein a plurality of optical fibers 4 are arranged in the optical fiber protection steel tube 5. The optical fiber unit 1 further includes a fiber paste 6, which fills the gaps between the optical fibers 4 in the optical fiber protection steel tube 5.

[0048] The number of optical fibers 4 is 1-6, and the coating of the optical fiber 4 is an acrylate coating, a heat-resistant acrylate coating, a silicone coating or a polyimide coating. A carbon-coated sealing layer may be provided inside the optical fiber coating as required.

[0049] like Figure 3 As shown, the insulated conductor unit 2 includes a conductor 7, an insulating layer 8 and an insulated conductor protection steel tube 9. The insulating layer 8 is coated on the outside of the conductor 7, and the insulated conductor protection steel tube 9 is sleeved on the outside of the insulating layer 8.

[0050] The conductor 7 is made of copper, tinned copper, nickel-plated copper or silver-plated copper, and the insulating layer 8 is made of a polymer insulating material or a high-temperature resistant inorganic insulating material. The high-temperature resistant inorganic insulating material is glass fiber yarn, glass fiber tape or mica tape.

[0051] The wall thickness of the optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 is 0.1-0.4mm. The material of the optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 is metal material such as 304, 316L or 825. The optical fiber protection steel tube 5 and the insulated conductor protection steel tube 9 are formed by longitudinally wrapping with metal strips and then continuously welding, and have radial sealing properties.

[0052] The wall thickness of the armored steel pipe 3 is 0.5-1.5mm. The material of the armored steel pipe 3 is corrosion-resistant alloy such as 316L, 825, 625, 2205, 2507, etc. The armored steel pipe 3 is formed by longitudinally wrapping the metal strip and then continuously welding. It has radial sealing and can withstand an external pressure of not less than 70MPa.

[0053] The utility model of a steel tube armored photoelectric composite cable further comprises a filling layer 10, which is filled in the gap between the optical fiber unit 1 and an insulated conductor unit 2 inside the armored steel tube 3. After the optical fiber unit 1 and the insulated conductor unit 2 are parallel or twisted, the filling layer 10 is coated on the outside of the optical fiber unit 1 and the insulated conductor unit 2. The filling layer 10 is made of high molecular polymer materials such as high temperature resistant polypropylene, foamed high temperature resistant polypropylene, PVDF, FEP or foamed FEP, and its outer diameter is basically the same as the inner diameter of the armored steel tube 3. It is tightly filled in the armored steel tube 3 and the outside of the optical fiber unit 1 and the insulated conductor unit 2 to form a sealed filling layer with longitudinal sealing.

[0054] The utility model of a steel tube armored photoelectric composite cable further comprises an encapsulation protective layer 11, which is coated on the outside of the armored steel tube 3, and the encapsulation protective layer 11 is made of a high temperature resistant polymer material, and the high temperature resistant polymer material is PP, TPV, TPR, TPU, PVDF, Nylon, FEP, PFA or PEEK. The cross-sectional shape of the encapsulation protective layer 11 is circular.

[0055] The steel tube armored composite cable of the utility model comprises an optical fiber unit and an insulated conductor unit inside, which can realize the functions of optical fiber sensing, communication, power supply and signal transmission of downhole instruments at the same time. Compared with a single downhole optical cable and cable, the scheme combines the functions of the optical cable and the cable, can replace at least one optical cable and one cable, reduce the number of cables installed in the wellbore, reduce the construction difficulty, improve the engineering efficiency and save the construction cost; a separate insulated conductor protection steel pipe is arranged on the outside of the insulated conductor unit of the utility model, which can prevent the insulation layer of the internal conductor from being burned during the welding of the outer thick-walled armored steel pipe in the production process, thereby ensuring the integrity of the conductor insulation and improving the qualified rate of the product; the insulated conductor unit and the optical fiber unit of the utility model are independently arranged and steel pipe protection is respectively arranged, the optical fiber unit and the insulated conductor unit are easy to separate, and the wiring is more convenient when connected with the downhole instrument; the utility model arranges steel pipe protection on the outside of the insulated conductor unit and the optical fiber unit, increases the pressure resistance of the photoelectric composite cable and the insulated conductor unit, and when the photoelectric composite cable is subjected to external pressure during use, the insulation layer is not easily crushed and broken, thereby improving the pressure resistance and service life of the photoelectric composite cable. The utility model adopts thick-walled corrosion-resistant alloy armored steel pipe for protection, which effectively improves the optical cable's resistance to external radial pressure and anti-flattening performance, ensuring the safety of the optical cable during construction and in high-pressure environments underground. The gaps between the armored steel pipe and the optical fiber unit and the insulated conductor unit are tightly filled and sealed with high-temperature resistant polymers, effectively preventing corrosive or toxic liquids and gases from penetrating into the ground through the internal gaps of the optical cable, avoiding safety threats to the ground ecological environment and personnel.

[0056] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A steel tube armored photoelectric composite cable, characterized in that: It comprises an optical fiber unit, at least one insulated conductor unit and an armored steel pipe. The optical fiber unit and at least one insulated conductor unit are arranged in the armored steel pipe. An optical fiber protection steel pipe is arranged outside the optical fiber unit, and an insulated conductor protection steel pipe is arranged outside each insulated conductor unit.

2. The steel tube armored photoelectric composite cable according to claim 1, characterized in that: The optical fiber unit comprises an optical fiber and an optical fiber protection steel tube, and a plurality of optical fibers are arranged in the optical fiber protection steel tube.

3. The steel tube armored photoelectric composite cable according to claim 2, characterized in that: The optical fiber unit further comprises fiber paste, which fills the gaps between the optical fibers in the optical fiber protection steel tube.

4. The steel tube armored photoelectric composite cable according to claim 2, characterized in that: The number of the optical fibers is 1 to 6, and the coating layer of the optical fiber is an acrylate coating layer, a heat-resistant acrylate coating layer, a silicone coating layer or a polyimide coating layer.

5. The steel tube armored photoelectric composite cable according to claim 4, characterized in that: A carbon-coated sealing layer is arranged inside the optical fiber coating layer.

6. The steel tube armored photoelectric composite cable according to claim 1, characterized in that: The insulated conductor unit comprises a conductor, an insulating layer and an insulated conductor protection steel pipe. The insulating layer is coated on the outside of the conductor, and the insulated conductor protection steel pipe is sleeved on the outside of the insulating layer.

7. The steel tube armored photoelectric composite cable according to claim 6, characterized in that: The conductor is made of copper, tin-plated copper, nickel-plated copper or silver-plated copper, and the insulating layer is a high molecular polymer insulating material or a high temperature resistant inorganic insulating material.

8. The steel tube armored photoelectric composite cable according to claim 1, characterized in that: The wall thickness of the optical fiber protection steel pipe and the insulated conductor protection steel pipe is 0.1-0.4mm, and the optical fiber protection steel pipe and the insulated conductor protection steel pipe are formed by longitudinally wrapping metal strips and then continuously welding; the wall thickness of the armored steel pipe is 0.5-1.5mm, and the armored steel pipe is made of corrosion-resistant alloy, and the armored steel pipe is formed by longitudinally wrapping metal strips and then continuously welding.

9. The steel tube armored photoelectric composite cable according to claim 1, characterized in that: The utility model also comprises a filling layer, which is filled in the gap between the optical fiber unit and at least one insulated conductor unit inside the armored steel pipe.

10. The steel tube armored photoelectric composite cable according to claim 1, characterized in that: It also includes a packaging protective layer, which is coated on the outside of the armored steel pipe. The packaging protective layer is made of high-temperature resistant polymer material, and the cross-sectional shape of the packaging protective layer is circular or rectangular.

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