Silica gel tight carbon fiber photoelectric cable and manufacturing method, downhole data measurement system

Abstract

This invention provides a silicone-coated carbon fiber optical cable and its manufacturing method, as well as a downhole data measurement system, belonging to the field of casing well logging technology. The silicone-coated carbon fiber optical cable includes: a carbon fiber shell, a reinforcing unit, an optical fiber unit, and a power supply conductor unit. The reinforcing unit is located at the center of the silicone-coated carbon fiber optical cable, and the optical fiber unit and power supply conductor unit are symmetrically arranged around the reinforcing unit. The carbon fiber shell is formed in one piece on the surface of the reinforcing unit, the optical fiber unit, and the power supply conductor unit. This invention solves the technical problem of inaccurate measurement results due to excess fiber length inside the optical cable and the inconsistency between the cable length and the fiber length, by using a one-piece molded carbon fiber shell to wrap the reinforcing unit, multiple optical fiber units, and multiple power supply conductor units, thus ensuring the sensitivity of fiber optic logging.

Description

Technical Field

[0001] This invention relates to the field of casing well logging technology, specifically to a silicone-coated carbon fiber optical cable, a method for manufacturing the silicone-coated carbon fiber optical cable, and a downhole data measurement system. Background Technology

[0002] Fiber optic logging utilizes the principle that optical parameters are highly sensitive to the environment; that is, the formation environment can modulate parameters such as light intensity, frequency, wavelength, phase, and polarization state. By monitoring and demodulating changes in optical parameters, accurate environmental information can be obtained. Distributed fiber optic logging technology can solve the problems of traditional logging instruments being "too difficult to deploy, inaccurate, and discontinuous in data," driving the development of logging equipment towards miniaturization, resistance to electromagnetic interference, and long-term continuous monitoring.

[0003] As a distributed fiber optic logging sensor, the optical cable needs to meet the requirement of accurate measurement. However, the existing optical cable technology has the problem of excess fiber length inside the cable and the inconsistency between the cable length and the fiber length. This technical problem causes certain errors in the measurement of downhole parameters such as temperature, pressure and displacement. Summary of the Invention

[0004] To address the aforementioned technical deficiencies, this invention provides a silicone-coated carbon fiber optical cable and its manufacturing method, as well as a downhole data measurement system. The silicone-coated carbon fiber optical cable solves the technical problem of inaccurate measurement results due to excess fiber length inside the optical cable and the inconsistency between the cable length and the fiber length, by using a one-piece molded carbon fiber shell to wrap the reinforcing unit, the optical fiber unit, and the power supply conductor unit, thus ensuring the sensitivity of fiber optic logging.

[0005] The first aspect of the present invention provides a silicone-coated carbon fiber optical cable for use in fiber optic logging sensors, comprising: a carbon fiber shell, a reinforcing element unit, an optical fiber unit, and a power supply conductor unit; The reinforcing unit is located at the center of the silicone-coated carbon fiber optical cable, and the optical fiber unit and the power supply conductor unit are located around the reinforcing unit. The carbon fiber shell is formed in one piece on the outer surface of the reinforcing unit, the optical fiber unit, and the power supply wire unit to enclose the reinforcing unit, the optical fiber unit, and the power supply wire.

[0006] In this embodiment of the invention, the optical fiber unit includes: at least one single-mode optical fiber unit and at least one multimode optical fiber unit; The single-mode fiber unit and the multimode fiber unit are symmetrically arranged on both sides of the reinforcing member unit; There are two power supply conductor units, which are symmetrically arranged on the other two sides of the reinforcing member unit.

[0007] In this embodiment of the invention, the single-mode fiber unit includes: a plurality of single-mode fibers, a first polytetrafluoroethylene layer, and a first silicone layer; The first polytetrafluoroethylene layer is wrapped around the surface of the plurality of single-mode optical fibers; The first silicone layer is wrapped around the surface of the first polytetrafluoroethylene layer.

[0008] In this embodiment of the invention, the multimode fiber unit includes: a plurality of multimode fibers, a second polytetrafluoroethylene layer, and a second silicone layer; The second polytetrafluoroethylene layer is wrapped around the surface of the plurality of multimode optical fibers; The second silicone layer is wrapped around the surface of the second polytetrafluoroethylene layer.

[0009] In this embodiment of the invention, the power supply conductor unit is used to supply power to downhole instruments.

[0010] In this embodiment of the invention, the power supply conductor unit includes: a copper stranded conductor and an insulating layer, wherein the insulating layer is wrapped around the surface of the copper stranded conductor.

[0011] In this embodiment of the invention, the copper wire stranded conductor is formed by stranding several copper wires together.

[0012] In this embodiment of the invention, the end face of the silicone-coated carbon fiber optical cable above the well is connected to a power supply, and the end face of the silicone-coated carbon fiber optical cable below the well is connected to a logging instrument.

[0013] In this embodiment of the invention, the reinforcing element is a reinforcing steel wire.

[0014] In this embodiment of the invention, the reinforcing unit is: an aramid fiber reinforced composite material, a glass fiber reinforced composite material, a carbon fiber reinforced composite material, or a basalt fiber reinforced composite material.

[0015] In this embodiment of the invention, the silicone-coated carbon fiber optical cable further includes: a wear-resistant layer, which is disposed on the outer surface of the carbon fiber shell; The wear-resistant layer is made of flexible polyurea, polyethylene, or polyvinyl chloride.

[0016] A second aspect of the present invention provides a downhole data measurement system, comprising: a fiber optic logging sensor and various downhole instruments, wherein the fiber optic logging sensor comprises a silicone-coated carbon fiber optical cable as described above; The silicone-coated carbon fiber optical cable is connected to the power supply at the end face above the well. The silicone-coated carbon fiber optical cable is located at the end face downhole and connects to various downhole instruments.

[0017] In this embodiment of the invention, the downhole instrument includes a power supply unit, which is connected to the power supply conductor unit of the silicone-coated carbon fiber optical cable.

[0018] A third aspect of this invention provides a method for manufacturing a silicone-coated carbon fiber optical cable, the silicone-coated carbon fiber optical cable comprising: a carbon fiber outer shell, a reinforcing element unit, a single-mode optical fiber, a multi-mode optical fiber, and a power supply conductor unit, the method comprising: A single-mode fiber unit is obtained by tightly winding a polytetrafluoroethylene layer around the surface of several single-mode optical fibers and then tightly winding a silicone layer around the surface of the polytetrafluoroethylene layer. A multimode fiber unit is obtained by tightly winding a polytetrafluoroethylene layer around the surface of several multimode optical fibers and then tightly winding a silicone layer around the surface of the polytetrafluoroethylene layer. Two power supply conductor units are obtained by tightly wrapping an insulation layer around the surface of a copper stranded wire. A reinforcing element unit is placed in the center, and a single-mode fiber unit, a multimode fiber unit, and two power supply wire units are symmetrically arranged around the reinforcing element unit. A carbon fiber shell is formed in one step on the outer surface of the reinforcing unit, single-mode fiber unit, multimode fiber unit, and power supply conductor unit by pultrusion molding to obtain a silicone-coated carbon fiber optical cable. The silicone-coated carbon fiber optical cable solves the technical problem of inaccurate measurement results caused by the excess length of the optical fiber inside the cable and the inconsistency between the cable length and the optical fiber length, by using a one-time molded carbon fiber shell to wrap the reinforcing unit, multiple optical fiber units, and multiple power supply conductor units, thus ensuring the sensitivity of optical fiber logging.

[0019] Other features and advantages of the technical solution of the present invention will be described in detail in the following detailed embodiments section. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of the silicone-coated carbon fiber optical cable provided in an embodiment of the present invention; Figure 2 This is a flowchart of the method for manufacturing silicone-coated carbon fiber optical cable according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures 1-Carbon fiber outer shell, 2-First silicone layer, 3-Insulation layer, 4-Copper wire stranded conductor, 5-First polytetrafluoroethylene layer, 6-Single-mode optical fiber, 7-Reinforcing unit, 8-Multimode optical fiber, 9-Second polytetrafluoroethylene layer, 10-Second silicone layer. Detailed Implementation

[0022] To make the technical solutions and advantages of the embodiments of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In realizing this invention, the inventors discovered that fiber optic logging utilizes the principle that optical parameters are highly sensitive to the environment. Specifically, the formation environment can modulate parameters such as light intensity, frequency, wavelength, phase, and polarization state. By monitoring and demodulating changes in these optical parameters, accurate environmental information can be obtained. Distributed fiber optic logging technology can solve the problems of traditional logging instruments being "unable to reach the target depth, inaccurate in measurement, and discontinuous data," driving the development of logging equipment towards miniaturization, resistance to electromagnetic interference, and long-term continuous monitoring. The optical cable used as a sensor in distributed fiber optic logging needs to meet the requirement of accurate measurement. However, existing optical cables suffer from excess fiber length within the cable, resulting in a discrepancy between the cable length and the fiber length. This technical problem leads to certain errors in the measurement of downhole parameters such as temperature, pressure, and displacement.

[0027] To address the aforementioned problems, this invention provides a silicone-coated carbon fiber optical cable for use in fiber optic logging sensors. The cable includes a carbon fiber shell, a reinforcing unit, optical fiber units, and power supply conductor units. The reinforcing unit is located at the center of the silicone-coated carbon fiber optical cable, the optical fiber units are arranged around the reinforcing unit, and the power supply conductor units are arranged around the reinforcing unit. The carbon fiber shell is integrally formed on the outer surfaces of the reinforcing unit, optical fiber units, and power supply conductor units to enclose them. By using a one-piece molded carbon fiber shell to enclose the reinforcing unit, multiple optical fiber units, and multiple power supply conductor units, the silicone-coated carbon fiber optical cable solves the technical problem of insufficient measurement results due to excess fiber length inside the cable and inconsistencies between the cable length and fiber length, thus ensuring the sensitivity of fiber optic logging.

[0028] Figure 1 This is a schematic diagram of the structure of the silicone-coated carbon fiber optical cable provided in an embodiment of the present invention. Figure 1 As shown, the silicone-coated carbon fiber optical cable provided in this embodiment includes: a carbon fiber shell 1, a reinforcing unit 7, an optical fiber unit, and a power supply conductor unit; the optical fiber unit includes: at least one single-mode optical fiber unit and at least one multimode optical fiber unit, wherein the single-mode optical fiber unit includes: several single-mode optical fibers 6, a first polytetrafluoroethylene layer 5, and a first silicone layer 2, and the multimode optical fiber unit includes: several multimode optical fibers 8, a second polytetrafluoroethylene layer 9, and a second silicone layer 10; the power supply conductor unit includes: copper stranded wire 4 and an insulation layer 3; the reinforcing unit 7 includes: reinforcing steel wire.

[0029] The reinforcing unit 7 is located at the center of the silicone-coated carbon fiber optical cable, that is, at the center of the gap between multiple single-mode fiber units, multiple multimode fiber units and multiple power supply wire units. Multiple single-mode fiber units and multiple multimode fiber units are symmetrically arranged around the reinforcing unit 7, and multiple power supply wire units are symmetrically arranged around the reinforcing unit 7. Specifically, one single-mode fiber unit and one multimode fiber unit are symmetrically arranged on both sides of the reinforcing unit 7. There are two power supply conductor units, which are symmetrically arranged on the other two sides of the reinforcing member unit.

[0030] The carbon fiber outer shell 1 is integrally formed on the outer surface of the reinforcing unit 7, the optical fiber unit, and the power supply conductor unit to enclose them. By integrally forming the carbon fiber outer shell 1 on the outer surface of the reinforcing unit 7, the optical fiber unit, and the power supply conductor unit, the overall length of the optical cable can be ensured to be consistent with the length of the internal optical fiber, thereby ensuring the accuracy of the downhole parameter information collected by the fiber optic logging sensor.

[0031] In this embodiment, the carbon fiber outer shell 1 possesses properties such as high temperature resistance, acid and alkali resistance, light weight, and high tear resistance. The carbon fiber outer shell 1 ensures the overall lightweight, high strength, and high modulus of the optical cable, enabling it to withstand corrosion from various corrosive gases within oil and gas wells. Simultaneously, the carbon fiber outer shell 1 exhibits high flexibility and bending tolerance, adapting to complex wellbore environments. The carbon fiber surface has a very low coefficient of friction, effectively reducing frictional resistance in horizontal wells. Therefore, the pultrusion molding process for preparing the carbon fiber outer shell 1 is characterized by simple molding technology, high mechanization, and high production efficiency, significantly reducing the overall weight of the cable and greatly improving its load-bearing capacity and service life. Compared to traditional optical cables, the silicone-coated carbon fiber optical cable of this invention prevents the cable from bending under stress, thereby effectively ensuring the signal transmission efficiency of the optical cable.

[0032] In this embodiment, the optical fiber unit is used to provide downhole distributed acoustic wave and distributed temperature information.

[0033] In this embodiment, the power supply conductor unit is used to supply power to other measuring instruments downhole.

[0034] In this embodiment, the single-mode fiber unit and the multimode fiber unit are symmetrically arranged around the reinforcing member unit 7. The single-mode fiber 6 is used to transmit one mode of light for long-distance transmission, while the multimode fiber 8 is used to transmit multiple modes of light for short-distance transmission.

[0035] In this embodiment, the single-mode fiber unit includes: a plurality of single-mode optical fibers 6, a first polytetrafluoroethylene layer 5, and a first silicone layer 2; The first polytetrafluoroethylene layer 5 is wrapped around the surface of the plurality of single-mode optical fibers 6; The first silicone layer 2 is wrapped around the surface of the first polytetrafluoroethylene layer 5.

[0036] Specifically, the plurality of single-mode optical fibers 6 are disposed inside the first polytetrafluoroethylene layer 5; the first silicone layer 2 is disposed on the surface of the first polytetrafluoroethylene layer 5 and is used to wrap the first polytetrafluoroethylene layer 5.

[0037] Specifically, placing several single-mode optical fibers 6 within the first polytetrafluoroethylene (PTFE) layer 5 ensures the high-temperature resistance and good bendability of the optical fibers. A first silicone layer 2 is used to wrap the first PTFE layer 5, achieving high-temperature resistance, cold resistance, and weather resistance. The first silicone layer 2 also provides a certain buffering effect, thereby improving the bending resistance of the optical cable.

[0038] Furthermore, the combined use of the first polytetrafluoroethylene layer 5 and the first silicone layer 2—specifically, the tight bonding of the single-mode optical fiber 6 with the flexible first polytetrafluoroethylene layer 5 and the high-temperature resistant first silicone layer 2—effectively reduces acoustic vibration transmission loss during logging, thereby improving detection sensitivity. The tight bonding of the single-mode optical fiber 6, the first polytetrafluoroethylene layer 5, and the first silicone layer 2 ensures the airtightness of the structure, thus guaranteeing the service life of the optical cable. The tightly bonded optical fiber unit possesses high elasticity, sealing properties, and corrosion resistance, and can withstand high temperatures of 200-250℃, enabling the optical cable to maintain good vibration propagation capabilities even when subjected to bending and twisting in complex downhole environments, ensuring the acoustic detection sensitivity of the optical fiber during logging.

[0039] In this embodiment, the multimode fiber unit includes: a plurality of multimode fibers 8, a second polytetrafluoroethylene layer 9, and a second silicone layer 10; The second polytetrafluoroethylene layer 9 is wrapped around the surface of the plurality of multimode optical fibers 8; The second silicone layer 10 is wrapped around the surface of the second polytetrafluoroethylene layer 9.

[0040] Specifically, the plurality of multimode optical fibers 8 are disposed inside the second polytetrafluoroethylene layer 9; the second silicone layer 10 is disposed on the surface of the second polytetrafluoroethylene layer 9 and is used to wrap the second polytetrafluoroethylene layer 9.

[0041] In this embodiment, the multimode fiber unit has the same structure as the single-mode fiber unit. The only difference is that the single-mode fiber unit uses single-mode fiber 6, while the multimode fiber unit uses multimode fiber 8.

[0042] By placing single-mode fiber 6 or multimode fiber 8 in a polytetrafluoroethylene layer and a silicone layer to form a silicone tight-packed structure, the problem of reduced sound wave detection sensitivity caused by loss during sound wave propagation due to the rigidity of the stainless steel tube, which is a problem in the prior art where the fiber is placed in a stainless steel tube, is avoided.

[0043] In this embodiment, the power supply lead unit is used to supply power to downhole instruments. Downhole instruments include, but are not limited to, measuring instruments or control instruments.

[0044] In this embodiment, the power supply conductor unit includes: a copper stranded conductor 4 and an insulation layer 3, wherein the insulation layer 3 is wrapped around the surface of the copper stranded conductor 4.

[0045] In this embodiment, the copper wire stranded conductor 4 is composed of several copper wires stranded together.

[0046] In this embodiment, there are multiple power supply conductor units, which can supply power to multiple downhole instruments.

[0047] Specifically, the several copper wires form a copper wire stranded conductor 4 located inside the insulation layer 3. The wires in the optical cable can power downhole instruments. During logging operations, various downhole instruments can be attached to the end of the optical cable, or a crawler can be attached to achieve horizontal well logging over longer distances. It is compatible with the rich measurement parameters of electrical instruments and the embedded, uninterrupted, and all-space characteristics of distributed optical fiber logging.

[0048] In this embodiment, the end face of the silicone-coated carbon fiber optical cable above the well is connected to the power supply, and the end face of the silicone-coated carbon fiber optical cable below the well is connected to the logging instrument.

[0049] In this embodiment, the reinforcing unit 7 is a reinforcing steel wire. In this embodiment, the reinforcing steel wire is disposed on the optical cable to provide reinforcement.

[0050] In other embodiments of the present invention, the reinforcing unit 7 is: an aramid fiber reinforced composite material, a glass fiber reinforced composite material, a carbon fiber reinforced composite material, or a basalt fiber reinforced composite material.

[0051] In this embodiment, the outer diameter of the reinforcing steel wire is 1 mm, the outer diameters of the first PTFE layer 5 and the second PTFE layer are 0.6 mm, the outer diameters of the first silicone layer 2 and the second silicone layer 10 are 2.48 mm, the copper wire stranded conductor 4 is composed of 7 strands of 0.33 mm copper wire, and the outer diameter of the insulation layer 3 is 2.48 mm. The outer diameter of the carbon fiber outer shell 1 is 15 mm. A 15 mm outer diameter optical cable provides higher strength and modulus to meet the logging requirements under different conditions.

[0052] In other embodiments of the present invention, the outer diameter of the carbon fiber shell 1 is selected as 8 mm, and the 8 mm outer diameter optical cable provides a smaller winding radius and lighter weight.

[0053] The silicone-coated carbon fiber optical cable provided by this invention features a scientifically sound and reasonable design structure. This design improves the cable's bending resistance while ensuring it meets the high sensitivity, high temperature and pressure resistance, and corrosion resistance requirements of complex logging environments. The cable experiences minimal damage after being run into the well, and is characterized by low cost, safe operation, and ease of use. It is primarily suitable for complex well conditions such as small boreholes, ultra-deep wells, and horizontal wells. It can provide various fiber optic logging services, including distributed acoustic logging, distributed temperature logging, and high-sensitivity acoustic logging, and can also utilize optical fiber as a communication medium for fiber optic communication.

[0054] In this embodiment, the silicone-coated carbon fiber optical cable further includes: a wear-resistant layer, which is disposed on the outer surface of the carbon fiber outer shell; The wear-resistant layer is made of flexible polyurea, polyethylene, or polyvinyl chloride.

[0055] The second aspect of this embodiment provides a downhole data measurement system, including: a fiber optic logging sensor and various downhole instruments, wherein the fiber optic logging sensor includes a silicone-coated carbon fiber optical cable as described above; The silicone-coated carbon fiber optical cable is connected to the power supply at the end face above the well. The silicone-coated carbon fiber optical cable is located at the end face downhole and connects to various downhole instruments.

[0056] In this embodiment, the downhole instrument includes a power supply unit connected to the power supply conductor unit of the silicone-coated carbon fiber optical cable. Specifically, the power supply unit is an energy storage battery, and the silicone-coated carbon fiber optical cable supplies power to the energy storage battery of the downhole instrument. The energy storage battery also includes a voltage conversion unit to flexibly supply power to downhole instruments with various voltage requirements.

[0057] Figure 2 This is a flowchart illustrating the manufacturing method of the silicone-coated carbon fiber optical cable provided in an embodiment of the present invention. Figure 2 As shown, the third aspect of this embodiment provides a method for manufacturing a silicone-coated carbon fiber optical cable, used to manufacture a silicone-coated carbon fiber optical cable. The silicone-coated carbon fiber optical cable includes: a carbon fiber shell, a reinforcing element unit, a single-mode optical fiber, a multi-mode optical fiber, and a power supply conductor unit. The method includes: S1. A polytetrafluoroethylene layer is tightly wound around the surface of several single-mode optical fibers, and a silicone layer is tightly wound around the surface of the polytetrafluoroethylene layer to obtain a single-mode optical fiber unit. S2. A polytetrafluoroethylene (PTFE) layer is tightly wound around the surface of several multimode optical fibers, and a silicone layer is tightly wound around the surface of the PTFE layer to obtain a multimode optical fiber unit. S3. Tightly wrap an insulating layer around the surface of the copper stranded wire to obtain two power supply wire units; S4. Place a reinforcing element unit in the center position, and symmetrically arrange a single-mode fiber unit, a multimode fiber unit, and two power supply wire units around the reinforcing element unit. S5. A carbon fiber shell is formed on the outer surface of the reinforcing unit, single-mode fiber unit, multimode fiber unit and power supply conductor unit by pultrusion molding to obtain a silicone tightly wrapped carbon fiber optical cable.

[0058] The manufacturing method of the silicone-coated carbon fiber optical cable is as follows: First, a high-temperature resistant polyimide coating is applied to the single-mode optical fiber 6 and the multimode optical fiber 8. Then, a polytetrafluoroethylene layer and a silicone layer are sequentially and tightly wound around the outer surfaces of several single-mode optical fibers 6 and multimode optical fibers 8, forming the optical fiber sensing and transmission section of the optical cable. Second, an insulation layer 3 is tightly wound around the two copper stranded conductors 4, forming the power supply section of the optical cable. Finally, a reinforcing steel wire is used as the fixing and strengthening structure of the optical cable. The reinforcing steel wire is placed in the center, and two high-temperature resistant silicone layers with optical fibers and two insulation layers 3 with copper stranded conductors 4 are placed symmetrically around the center and fixed in position. Then, a carbon fiber outer shell 1 is formed on its outer surface by pultrusion molding, ultimately obtaining a silicone-coated carbon fiber optical cable.

[0059] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0060] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0061] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. Furthermore, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. As long as such combination does not violate the spirit of the embodiments of the present invention, it should also be considered as the content disclosed by the embodiments of the present invention.

Claims

1. A silicone-coated carbon fiber optical cable for use in fiber optic logging sensors, characterized in that, Includes: carbon fiber shell, reinforcing unit, fiber optic unit, and power supply wire unit; The reinforcing unit is located at the center of the silicone-coated carbon fiber optical cable, and the optical fiber unit and the power supply conductor unit are located around the reinforcing unit. The carbon fiber shell is formed in one piece on the outer surface of the reinforcing unit, the optical fiber unit, and the power supply wire unit to enclose the reinforcing unit, the optical fiber unit, and the power supply wire unit.

2. The silicone-coated carbon fiber optical cable according to claim 1, characterized in that, The optical fiber unit includes: at least one single-mode optical fiber unit and at least one multimode optical fiber unit; The single-mode fiber unit and the multimode fiber unit are symmetrically arranged on both sides of the reinforcing member unit; There are two power supply conductor units, which are symmetrically arranged on the other two sides of the reinforcing member unit.

3. The silicone-coated carbon fiber optical cable according to claim 2, characterized in that, The single-mode fiber unit includes: a plurality of single-mode fibers, a first polytetrafluoroethylene layer, and a first silicone layer; The first polytetrafluoroethylene layer is wrapped around the surface of the plurality of single-mode optical fibers; The first silicone layer is wrapped around the surface of the first polytetrafluoroethylene layer.

4. The silicone-coated carbon fiber optical cable according to claim 2, characterized in that, The multimode fiber unit includes: a plurality of multimode fibers, a second polytetrafluoroethylene layer, and a second silicone layer; The second polytetrafluoroethylene layer is wrapped around the surface of the plurality of multimode optical fibers; The second silicone layer is wrapped around the surface of the second polytetrafluoroethylene layer.

5. The silicone-coated carbon fiber optical cable according to claim 1, characterized in that, The power supply conductor unit is used to supply power to downhole instruments.

6. The silicone-coated carbon fiber optical cable according to claim 1, characterized in that, The power supply conductor unit includes: a copper stranded conductor and an insulation layer, wherein the insulation layer is wrapped around the outer surface of the copper stranded conductor.

7. The silicone-coated carbon fiber optical cable according to claim 6, characterized in that, The copper wire stranded conductor is made of several copper wires twisted together.

8. The silicone-coated carbon fiber optical cable according to claim 1, characterized in that, The silicone-coated carbon fiber optical cable is connected to the power supply at the surface of the well, and the silicone-coated carbon fiber optical cable is connected to the logging instrument at the bottom of the well.

9. The silicone-coated carbon fiber optical cable according to claim 1, characterized in that, The reinforcing element is a reinforcing steel wire.

10. The silicone-coated carbon fiber optical cable according to claim 1, characterized in that, The reinforcing unit is: an aramid fiber reinforced composite material, a glass fiber reinforced composite material, a carbon fiber reinforced composite material, or a basalt fiber reinforced composite material.

11. The silicone-coated carbon fiber optical cable according to claim 1, characterized in that, The silicone-coated carbon fiber optical cable further includes: a wear-resistant layer, which is disposed on the outer surface of the carbon fiber shell; The wear-resistant layer is made of flexible polyurea, polyethylene, or polyvinyl chloride.

12. A downhole data measurement system, characterized in that, include: Fiber optic logging sensors and various downhole instruments, wherein the fiber optic logging sensor includes a silicone-coated carbon fiber optical cable as described in any one of claims 1-11; The silicone-coated carbon fiber optical cable is connected to the power supply at the end face above the well. The silicone-coated carbon fiber optical cable is located at the end face downhole and connects to various downhole instruments.

13. The downhole data measurement system according to claim 12, characterized in that, The downhole instrument includes a power supply unit, which is connected to the power supply conductor unit of the silicone-coated carbon fiber optical cable.

14. A method for manufacturing a silicone-coated carbon fiber optical cable, characterized in that, The silicone-coated carbon fiber optical cable includes: a carbon fiber outer shell, a reinforcing element unit, a single-mode optical fiber, a multi-mode optical fiber, and a power supply conductor unit. The method includes: A single-mode fiber unit is obtained by tightly winding a polytetrafluoroethylene layer around the surface of several single-mode optical fibers and then tightly winding a silicone layer around the surface of the polytetrafluoroethylene layer. A multimode fiber unit is obtained by tightly winding a polytetrafluoroethylene layer around the surface of several multimode optical fibers and then tightly winding a silicone layer around the surface of the polytetrafluoroethylene layer. Two power supply conductor units are obtained by tightly wrapping an insulation layer around the surface of a copper stranded wire. A reinforcing element unit is placed in the center, and a single-mode fiber unit, a multimode fiber unit, and two power supply wire units are symmetrically arranged around the reinforcing element unit. A carbon fiber shell is formed in one step on the outer surface of the reinforcing unit, single-mode fiber unit, multimode fiber unit, and power supply conductor unit by pultrusion molding to obtain a silicone-coated carbon fiber optical cable.

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