Optical fiber temperature sensor for oil and gas wells

Abstract

The utility model provides an optical fiber temperature sensor for oil and gas well, including the sleeve body, the inside of sleeve body is provided with the oil pipe body, the one end of oil pipe body is connected with temperature measurement component, the detection end head of temperature measurement component is located in the inside of protection outer tube, temperature measurement component is used for carrying out temperature measurement processing to oil and gas well, temperature measurement component includes packer and temperature measurement sensor probe, the one end of oil pipe body is connected with packer, the one end of packer is connected with temperature measurement sensor probe away from sleeve body, variable control valve is provided at temperature measurement sensor probe, one end of variable control valve is connected with one end of packer. The utility model discloses an optical fiber temperature sensor is not sensitive to electromagnetic interference still can bear high temperature, high pressure ( above dozens of megapascal) and severe vibration and impact and so on rigorous condition, still can high precision measurement wellbore and well site environmental parameter.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well temperature measurement, and in particular to fiber optic temperature sensors for oil and gas wells. Background Technology

[0002] Fiber optic temperature sensors are devices that measure temperature based on optical principles. They offer advantages such as high sensitivity, resistance to electromagnetic interference, and resistance to high-temperature corrosion, and are widely used in industries such as industry, medicine, and aerospace. Fiber optic temperature sensors utilize the phenomenon that light intensity, wavelength, and phase change with temperature to measure temperature. For example, Raman scattering sensors calculate temperature by detecting changes in the intensity of scattered light generated by inelastic collisions in the optical fiber; fluorescence sensors measure temperature by observing the temperature-dependent luminescence properties of fluorescent materials (such as fluorescence intensity or lifetime); the thermal motion of molecules in the medium causes a shift in the wavelength of transmitted light, and fiber optic temperature sensors detect temperature changes by capturing this effect and converting it into an electrical signal output.

[0003] Oil and gas wells are boreholes drilled specifically to extract underground oil or natural gas. They are boreholes drilled into the formation according to a specific well layout system, or wells converted from other types of drilling for oil and gas production. During the operation of oil and gas wells, it is necessary to monitor their internal temperature. However, traditional electronic sensors such as pressure gauges, thermometers, and flow meters cannot operate in harsh environments with high temperatures, high pressures, corrosive conditions, or geomagnetic and geoelectric interference. Furthermore, traditional temperature measuring tools can only measure the temperature at a specific point within a given time period. To measure the temperature over the entire range, point sensors must be moved back and forth within the well, inevitably affecting the well's environmental balance. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of existing technologies, such as difficulty in use in harsh environments and small temperature measurement range, and to provide an optical fiber temperature sensor for oil and gas wells.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This utility model provides an optical fiber temperature sensor for oil and gas wells, including a casing body, an oil pipe body is provided inside the casing body, a temperature measuring component is connected to one end of the oil pipe body, and the detection end of the temperature measuring component is located inside the protective outer pipe. The temperature measuring component is used to perform temperature measurement on oil and gas wells.

[0007] The temperature measuring component includes a packer and a temperature sensing probe. One end of the tubing is connected to the packer, and the end of the packer away from the casing is connected to the temperature sensing probe.

[0008] A variable control valve is installed at the temperature sensing probe, and one end of the variable control valve is connected to one end of the packer.

[0009] In this technical solution, the fiber optic temperature sensor is insensitive to electromagnetic interference and can withstand harsh conditions such as high temperature, high pressure (tens of megapascals and above), as well as severe vibration and impact. It can still measure wellbore and well site environmental parameters with high accuracy. At the same time, the distributed temperature sensor has the distributed measurement capability to measure the spatial distribution of the measured object and obtain profile information.

[0010] Preferably, a light source component and an optical fiber transmission component are sequentially connected between the packer and the temperature sensing probe. The light source component and the optical fiber transmission component are interconnected, with the end of the light source component away from the optical fiber transmission component connected to the packer, and the end of the optical fiber transmission component away from the light source component connected to the end of the temperature sensing probe.

[0011] In this technical solution, a light source component can be used to emit a light source.

[0012] Preferably, the end of the optical fiber transmission component away from the light source component is connected to one end of the variable control valve.

[0013] Preferably, the sleeve body and the protective outer tube are detachably connected by a disassembly unit, which is used for connecting and disassembling the sleeve body and the protective outer tube.

[0014] In this technical solution, the disassembly and assembly unit facilitates the connection between the sleeve body and the protective outer tube, and the connection is stable and has good sealing performance.

[0015] Preferably, the disassembly and assembly unit includes a connecting component and an installation component. The connecting component includes a connecting ring plate, and both sides of the connecting ring plate are connected to an outer fixing ring and an inner fixing ring, with the inner fixing ring disposed inside the outer fixing ring.

[0016] The sleeve body and the protective outer tube are each connected to a plurality of disassembly plates arranged in a ring array at opposite ends. The disassembly plates are respectively arranged on the left and right sides of the connecting ring plate, and the disassembly plates are detachably connected to the connecting ring plate through an installation component.

[0017] In this technical solution, the connection components and installation components facilitate the installation and disassembly of the sleeve body and the protective outer tube.

[0018] Preferably, the connecting ring plate has multiple mounting slots arranged in a ring array on both its left and right sides, and the multiple disassembly plates are respectively disposed in the multiple mounting slots.

[0019] In this technical solution, the connecting ring plate and the protective outer tube, as well as the connecting ring plate and the sleeve body, can be connected using the disassembly plate.

[0020] Preferably, the mounting assembly includes a mounting plate, and a plurality of mounting plates arranged in a ring array are disposed on the outer side of the connecting ring plate;

[0021] The mounting plate is connected to two locking posts that are symmetrically distributed on the left and right sides near the connecting ring plate. The locking posts are slidably connected to the connecting ring plate and the disassembly plate, respectively.

[0022] The mounting plate and the disassembly plate are connected by disassembly bolts, which are threaded to the mounting plate and the disassembly plate respectively.

[0023] In this technical solution, the installation components facilitate the connection and disassembly of the mounting plate and connecting ring plate.

[0024] Preferably, the disassembly plate has a locking hole, the side of the connecting ring plate has a plurality of locking grooves arranged in a ring array, and the locking post is disposed in the locking hole and the locking groove.

[0025] In this technical solution, the position of the disassembly plate can be locked using a locking pin.

[0026] Preferably, the disassembly and assembly unit further includes an auxiliary sealing assembly, which includes an air reservoir and a sealing air reservoir, and the air reservoir and the sealing air reservoir are interconnected.

[0027] The connecting ring plate is provided with a receiving cavity, the outer side of the inner fixing ring is provided with a storage groove, the air storage bag is connected to the receiving cavity of the connecting ring plate, and the sealing air bag is connected to the storage groove of the inner fixing ring.

[0028] One side of the gas storage bag is connected to one side of the pressure plate, and the other side of the pressure plate is connected to a pressing column. The end of the pressing column away from the pressure plate is in contact with one end of the disassembly bolt.

[0029] An elastic sealing gasket is connected to the inner side of the outer fixing ring.

[0030] In this technical solution, the use of auxiliary sealing components can increase the sealing performance of the connection between the sleeve body and the connecting components, thereby ensuring the sealing performance between the sleeve body and the protective outer tube.

[0031] Preferably, the receiving cavity walls of the pressure plate and the connecting ring plate are connected with a plurality of elastic reset members.

[0032] In this technical solution, the use of an elastic reset component allows the pressure plate and other structures to easily return to their initial position during disassembly.

[0033] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0034] The positive and progressive effects of this utility model are as follows:

[0035] The fiber optic temperature sensor of this invention is insensitive to electromagnetic interference and can withstand harsh conditions such as high temperature, high pressure (tens of megapascals and above), as well as severe vibration and impact. It can still measure wellbore and well site environmental parameters with high accuracy. Moreover, the distributed temperature sensor has the distributed measurement capability to measure the spatial distribution of the measured object and obtain profile information, with a wide temperature measurement range.

[0036] Meanwhile, the optical fiber does not need to move back and forth within the detection area, which ensures that the temperature balance inside the well is not affected.

[0037] In addition, distributed fiber optic temperature sensors also have advantages such as small cross-sectional area, short shape, small space occupation in well shaft, and convenient installation and use.

[0038] Furthermore, fiber optic temperature sensors can achieve real-time continuous temperature measurement and monitoring over long distances; they can obtain hundreds or thousands of data points on a single sensor fiber optic loop that is thousands of meters long, significantly reducing the cost per unit of information; they have a wide measurement range, high spatial resolution, and high accuracy; they are unaffected by flow conditions, are easy to install and maintain, and can perform short-term or permanent monitoring; they have a small cross-section and low longitudinal section, thus greatly reducing the space they occupy in the wellbore; they are resistant to high temperatures, have no hysteresis, are stable and safe for long-term use, and are resistant to electromagnetic interference. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the fiber optic temperature sensor for oil and gas wells according to an embodiment of the present invention.

[0040] Figure 2 for Figure 1 The diagram shows the overall internal structure of the fiber optic temperature sensor for oil and gas wells.

[0041] Figure 3 for Figure 1 The diagram shows a three-dimensional structure of the assembly and disassembly unit for an oil and gas well fiber optic temperature sensor.

[0042] Figure 4 for Figure 1 The diagram shows a top view of the assembly and disassembly unit for an oil and gas well fiber optic temperature sensor.

[0043] Figure 5 for Figure 4 The diagram shows a front cross-sectional view of the fiber optic temperature sensor for oil and gas wells.

[0044] Figure 6 for Figure 4 The diagram shows a side cross-sectional view of the fiber optic temperature sensor used in oil and gas wells.

[0045] Figure 7 for Figure 1 The diagram shows the sensing process of a fiber optic temperature sensor for oil and gas wells.

[0046] Explanation of reference numerals in the attached figures

[0047] 1. Sleeve body;

[0048] 2. Oil pipe body;

[0049] 3. Temperature sensing component; 31. Packer; 32. Temperature sensing probe; 33. Variable control valve; 34. Light source component; 35. Fiber optic transmission component;

[0050] 4. Protective outer tube;

[0051] 5. Connecting components; 51. Connecting ring plate; 52. Outer fixing ring; 53. Inner fixing ring; 54. Disassembly plate;

[0052] 6. Install components; 61. Mounting plate; 62. Locking post; 63. Install and remove bolts;

[0053] 7. Auxiliary sealing assembly; 71. Air reservoir; 72. Sealing airbag; 73. Pressing column; 74. Pressure plate; 75. Elastic sealing gasket; 76. Elastic reset component. Detailed Implementation

[0054] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0055] Figures 1 to 7 The diagram shown is a structural schematic of an embodiment of the fiber optic temperature sensor for oil and gas wells according to this utility model. The fiber optic temperature sensor for oil and gas wells includes a casing body 1, an oil pipe body 2 is disposed inside the casing body 1, one end of the oil pipe body 2 is connected to a temperature measuring component 3, the detection end of the temperature measuring component 3 is disposed inside the protective outer pipe 4, and the temperature measuring component 3 is used to perform temperature measurement on the oil and gas well.

[0056] The temperature measuring component 3 includes a packer 31 and a temperature sensing probe 32. One end of the oil pipe body 2 is connected to the packer 31, and the end of the packer 31 away from the casing body 1 is connected to the temperature sensing probe 32.

[0057] A variable control valve 33 is provided at the temperature sensing probe 32, and one end of the variable control valve 33 is connected to one end of the packer 31.

[0058] In this technical solution, the fiber optic temperature sensor is insensitive to electromagnetic interference and can withstand harsh conditions such as high temperature, high pressure of tens of megapascals, and severe vibration and impact. It can still measure wellbore and well site environmental parameters with high accuracy. At the same time, the distributed temperature sensor has the distributed measurement capability to measure the spatial distribution of the measured object and obtain profile information.

[0059] A light source component 34 and an optical fiber transmission component 35 are sequentially connected between the packer 31 and the temperature sensing probe 32. The light source component 34 and the optical fiber transmission component 35 are interconnected, and the end of the light source component 34 away from the optical fiber transmission component 35 is connected to the packer 31, while the end of the optical fiber transmission component 35 away from the light source component 34 is connected to the end of the temperature sensing probe 32.

[0060] In this technical solution, a light source component 34 can emit a light source.

[0061] The end of the optical fiber transmission component 35 away from the light source component 34 is connected to one end of the variable control valve 33.

[0062] During installation, optical fibers can be installed in three ways:

[0063] 1. Permanent type; Fiber optic cables are usually placed outside the production tubing or casing as a permanent installation method, which can ensure that the fiber optic cables are not affected by downhole operations and can monitor the downhole temperature distribution continuously for a long time. This installation method can also be applied to gravel-packed sand control completion and smart completion.

[0064] 2. Retrievable type: The optical fiber is simply placed inside a capillary steel tube, similar to a well test wire or stranding system. The optical fiber can be wound onto a drum and lowered into the well, or placed in coiled tubing in horizontal or extended reach wells. The method of lowering and retrieving it is similar to wire rope operations, and it is mainly implemented in oil well production enhancement operations.

[0065] 3. Pumping type: The optical fiber is pushed into the pre-installed control line by pumping fluid.

[0066] Fiber optic installation types are divided into single-head installation and double-head installation. Double-head installation means that both ends of the fiber optic cable pass through the wellhead and return to the surface via a U-shaped connector. During measurement, the laser can send pulsed lasers from both ends into the fiber optic cable. Therefore, double-head fiber optic installation has higher accuracy and resolution and can automatically recalibrate the optical loss. It is particularly suitable for oil wells such as horizontal wells that need to analyze minute temperature changes.

[0067] The temperature sensing process of the fiber optic temperature sensor is as follows: a computer-controlled synchronous pulse generator produces pulses with a certain repetition frequency. These pulses modulate a pulsed laser to generate a series of high-power optical pulses and simultaneously provide synchronous pulses to a high-speed data acquisition card, initiating data acquisition. The optical pulses enter the sensing fiber through one port of a wavelength division multiplexer and generate backscattered light at various points in the fiber, returning to the wavelength division multiplexer.

[0068] Backscattered light is filtered out into Stokes light and anti-Stokes light by thin-film interference filters in the wavelength division multiplexer. The light is then output through the other two ports of the wavelength division multiplexer and enters the photodetector (APD) and amplifier for photoelectric conversion and amplification, respectively. The signal is then sent to the data acquisition and processing circuit for A / D conversion and related signal processing. The processed information is then sent to the computer for analysis, processing and display, and is used for temperature calculation.

[0069] Traditional temperature measurement tools can only measure the temperature at a specific point within a given time. To measure the temperature over the entire range, a point sensor must be moved back and forth within the well, inevitably affecting the well's environmental balance. The advantage of distributed fiber optic temperature sensors is that the fiber does not need to move back and forth within the detection area, ensuring that the temperature balance within the well remains unaffected.

[0070] Furthermore, since the optical fiber is placed inside the capillary tube, distributed optical fiber temperature sensor testing can be performed wherever the capillary tube can reach. Because the optical fiber temperature sensor can be laid in the wellbore to record rapidly changing temperature data, wellbore conditions can be controlled in real time, and a rapid imaging map of the entire wellbore temperature profile can be obtained immediately.

[0071] The fiber optic temperature sensor of this invention can be placed in the well for a long time to continuously monitor the temperature profile, or it can be used as a short-term monitoring method, just like production logging and radioactive tracer logging.

[0072] The sleeve body 1 and the protective outer tube 4 are detachably connected by a disassembly unit, which is used for connecting and disassembling the sleeve body 1 and the protective outer tube 4.

[0073] In this technical solution, the disassembly and assembly unit facilitates the connection between the sleeve body 1 and the protective outer tube 4, and the connection is stable and has good sealing performance.

[0074] The disassembly and assembly unit includes a connecting component 5 and an installation component 6. The connecting component 5 includes a connecting ring plate 51. Both sides of the connecting ring plate 51 are connected to an outer fixing ring 52 and an inner fixing ring 53. The inner fixing ring 53 is disposed inside the outer fixing ring 52.

[0075] The sleeve body 1 and the protective outer tube 4 are each connected to a plurality of disassembly plates 54 arranged in a ring array at opposite ends. The disassembly plates 54 are respectively arranged on the left and right sides of the connecting ring plate 51. The disassembly plates 54 are detachably connected to the connecting ring plate 51 through the mounting assembly 6.

[0076] In this technical solution, the connecting component 5 and the mounting component 6 facilitate the installation and disassembly of the sleeve body 1 and the protective outer tube 4.

[0077] The connecting ring plate 51 has multiple mounting slots arranged in a ring array on both its left and right sides, and the multiple disassembly plates 54 are respectively disposed in the multiple mounting slots.

[0078] In this technical solution, the connecting ring plate 51 and the protective outer tube 4, and the connecting ring plate 51 and the sleeve body 1 can be connected by the disassembly plate 54.

[0079] The mounting assembly 6 includes a mounting plate 61, and a plurality of mounting plates 61 arranged in a ring array are provided on the outer side of the connecting ring plate 51.

[0080] The mounting plate 61 is connected to two locking posts 62 that are symmetrically distributed on the left and right sides near the connecting ring plate 51. The locking posts 62 are slidably connected to the connecting ring plate 51 and the disassembly plate 54 respectively.

[0081] The mounting plate 61 and the disassembly plate 54 are connected by disassembly bolts 63, which are threadedly connected to the mounting plate 61 and the disassembly plate 54 respectively.

[0082] In this technical solution, the mounting component 6 facilitates the connection and disassembly of the mounting plate 54 and the connecting ring plate 51.

[0083] The disassembly plate 54 has a locking hole, and the side of the connecting ring plate 51 has multiple locking grooves arranged in a ring array. The locking post 62 is disposed in the locking hole and the locking groove.

[0084] In this technical solution, the position of the disassembly plate 54 can be locked using the locking pin 62.

[0085] The disassembly and assembly unit also includes an auxiliary sealing component 7, which includes an air storage bag 71 and a sealing bag 72, and the air storage bag 71 and the sealing bag 72 are interconnected.

[0086] The communication channel between the gas storage bag 71 and the sealing bag 72 is a hole opened on the side of the connecting ring plate 51, which allows the gas between the gas storage bag 71 and the sealing bag 72 to be converted into each other.

[0087] The connecting ring plate 51 is provided with a receiving cavity, the inner fixing ring 53 has a storage groove on its outer side, the air storage bag 71 is connected to the receiving cavity of the connecting ring plate 51, and the sealing bag 72 is connected to the storage groove of the inner fixing ring 53.

[0088] One side of the air-storage bladder 71 is connected to one side of the pressure plate 74, and the other side of the pressure plate 74 is connected to a pressing column 73. The end of the pressing column 73 away from the pressure plate 74 is in contact with one end of the disassembly bolt 63.

[0089] An elastic sealing gasket 75 is connected to the inner side of the outer fixing ring 52.

[0090] In this technical solution, the auxiliary sealing component 7 can be used to increase the sealing performance of the connection between the sleeve body 1 and the connecting component 5, thereby ensuring the sealing performance between the sleeve body 1 and the protective outer tube 4.

[0091] The pressure plate 74 and the cavity wall of the connecting ring plate 51 are connected to a plurality of elastic reset members 76.

[0092] In this technical solution, the elastic reset member 76 allows the pressure plate 74 and other structures to easily return to their initial positions during disassembly, at which time the gas in the sealing airbag 72 can be returned to the storage airbag 71.

[0093] During installation, the connecting ring plate 51 is positioned between the sleeve body 1 and the protective outer tube 4, so that the sleeve body 1 is located within the outer fixing ring 52 and inner fixing ring 53 on one side, and the protective outer tube 4 is located within the outer fixing ring 52 and inner fixing ring 53 on the other side. At this time, the disassembly plate 54 is located in the corresponding mounting groove.

[0094] Then, the mounting plate 61 is placed on the outside of the connecting ring plate 51. At this time, the locking pin 62 is in the locking hole and locking groove. Then, the disassembly bolt 63 is installed into the connecting ring plate 51. At this time, the connecting ring plate 51 and the locking pin 62 can be connected by the disassembly bolt 63, thereby completing the connection between the sleeve body 1, the connecting assembly 5 and the protective outer tube 4.

[0095] When installing the disassembly bolt 63, one end of the pressure column 73 can be contacted and driven to move in the same direction, thereby driving the pressure plate 74 to move in the same direction, so that the pressure plate 74 compresses the air storage bladder 71, thereby pressing the gas in the air storage bladder 71 into the sealing bladder 72. At this time, the elastic sealing gasket 75 can be used to fill the gap between the outer fixing ring 52, the variable control valve 33 and the sleeve body 1 or the protective outer tube 4, thereby increasing the sealing between the sleeve body 1 and the protective outer tube 4.

[0096] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A fiber optic temperature sensor for oil and gas wells, characterized in that: Includes a casing body (1), an oil pipe body (2) is provided inside the casing body (1), a temperature measuring component (3) is connected to one end of the oil pipe body (2), the detection end of the temperature measuring component (3) is provided inside the protective outer pipe (4), and the temperature measuring component (3) is used to perform temperature measurement on oil and gas wells; The temperature measuring component (3) includes a packer (31) and a temperature sensing probe (32). One end of the oil pipe body (2) is connected to the packer (31), and the end of the packer (31) away from the casing body (1) is connected to the temperature sensing probe (32). A variable control valve (33) is provided at the temperature sensing probe (32), and one end of the variable control valve (33) is connected to one end of the packer (31).

2. The fiber optic temperature sensor for oil and gas wells as described in claim 1, characterized in that: A light source component (34) and an optical fiber transmission component (35) are sequentially connected between the packer (31) and the temperature sensing probe (32). The light source component (34) and the optical fiber transmission component (35) are interconnected. The end of the light source component (34) away from the optical fiber transmission component (35) is connected to the packer (31), and the end of the optical fiber transmission component (35) away from the light source component (34) is connected to the end of the temperature sensing probe (32).

3. The fiber optic temperature sensor for oil and gas wells as described in claim 2, characterized in that: The end of the optical fiber transmission component (35) away from the light source component (34) is connected to one end of the variable control valve (33).

4. The fiber optic temperature sensor for oil and gas wells as described in claim 1, characterized in that: The sleeve body (1) and the protective outer tube (4) are detachably connected by a disassembly unit, which is used for connecting and disassembling the sleeve body (1) and the protective outer tube (4).

5. The fiber optic temperature sensor for oil and gas wells as described in claim 4, characterized in that: The disassembly and assembly unit includes a connecting component (5) and an installation component (6). The connecting component (5) includes a connecting ring plate (51). Both sides of the connecting ring plate (51) are connected to an outer fixing ring (52) and an inner fixing ring (53). The inner fixing ring (53) is located inside the outer fixing ring (52). The sleeve body (1) and the protective outer tube (4) are each connected to a plurality of disassembly plates (54) arranged in a ring array at opposite ends. The disassembly plates (54) are respectively arranged on the left and right sides of the connecting ring plate (51). The disassembly plates (54) are detachably connected to the connecting ring plate (51) through the installation component (6).

6. The fiber optic temperature sensor for oil and gas wells as described in claim 5, characterized in that: The connecting ring plate (51) has multiple mounting slots arranged in a ring array on both the left and right sides, and multiple disassembly plates (54) are respectively set in multiple mounting slots.

7. The fiber optic temperature sensor for oil and gas wells as described in claim 5, characterized in that: The mounting assembly (6) includes a mounting plate (61), and a plurality of mounting plates (61) arranged in a ring array are provided on the outside of the connecting ring plate (51); The mounting plate (61) has two locking pins (62) symmetrically distributed on the side near the connecting ring plate (51). The locking pins (62) are slidably connected to the connecting ring plate (51) and the disassembly plate (54) respectively. The mounting plate (61) and the disassembly plate (54) are connected by disassembly bolts (63), which are threaded to the mounting plate (61) and the disassembly plate (54) respectively.

8. The fiber optic temperature sensor for oil and gas wells as described in claim 7, characterized in that: The disassembly plate (54) has a locking hole, and the side of the connecting ring plate (51) has multiple locking grooves arranged in a ring array. The locking post (62) is set in the locking hole and the locking groove.

9. The fiber optic temperature sensor for oil and gas wells as described in claim 5, characterized in that: The disassembly and assembly unit also includes an auxiliary sealing assembly (7), which includes an air storage bag (71) and a sealing bag (72), and the air storage bag (71) and the sealing bag (72) are interconnected. The connecting ring plate (51) is provided with a receiving cavity, the inner fixing ring (53) is provided with a storage groove on the outside, the air storage bag (71) is connected to the receiving cavity of the connecting ring plate (51), and the sealing bag (72) is connected to the storage groove of the inner fixing ring (53). One side of the gas storage bag (71) is connected to one side of the pressure plate (74), and the other side of the pressure plate (74) is connected to a pressing column (73). The end of the pressing column (73) away from the pressure plate (74) is in contact with one end of the disassembly bolt (63). An elastic sealing gasket (75) is connected to the inner side of the outer fixing ring (52).

10. The fiber optic temperature sensor for oil and gas wells as described in claim 9, characterized in that: The cavity walls of the pressure plate (74) and the connecting ring plate (51) are connected to a plurality of elastic reset members (76).

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