Underground optical fiber pressure monitoring device

Abstract

The invention discloses an underground optical fiber pressure monitoring device, relates to the field of optical fiber pressure monitoring, and solves the problem that a movable scraper on an existing optical fiber pressure monitoring device is difficult to clean a transmission frame, the underground optical fiber pressure monitoring device comprises a device supporting plate and a mounting rod arranged on the outer side of the device supporting plate, and the device supporting plate is in butt joint with the mounting rod through two hoops. A pressure sensor is fixedly installed on the side, away from the installation rod, of the device supporting plate, a protective cover is arranged on the outer side of the pressure sensor, and an optical fiber cable extending into the installation rod is fixedly installed at the top of the pressure sensor. The monitoring mechanism is used for enabling the pressure sensor to perform underground safety monitoring, and the monitoring mechanism is mounted on the inner side of the protective cover; by means of the monitoring mechanism, the protective cover provides protection for the pressure sensor, underground petroleum is prevented from making direct contact with the pressure sensor, direct measurement is facilitated after the petroleum enters a well, and therefore the effect of accurate measurement is achieved.

Description

Technical Field

[0001] The invention relates to the field of optical fiber pressure monitoring, in particular to an underground optical fiber pressure monitoring device. Background Art

[0002] The downhole fiber optic pressure monitor is a device used to measure downhole pressure. It is usually used in underground operating environments such as oil and mines. This monitor uses fiber optic technology to measure pressure and has high measurement accuracy and stability to determine the production pressure and dynamic changes of the oil field, providing a scientific basis for the production and operation of the oil field. It is suitable for various complex downhole environments.

[0003] Since oil contains certain impurities, a filter will be installed on the outside of the optical fiber pressure monitor to filter out the impurities in the oil. However, as the impurities increase, the filter will be blocked. The existing Chinese public patent document: CN219241898U discloses an oil well fiber optic pressure monitoring device. During the detection, the internal pressure of the oil is transmitted to the pressure sensor through the transmission frame, so that the operation of collecting internal pressure data can be achieved. After a period of use, the floating impurities in the oil will adhere to the moving scraper, which will cause the surface area of ​​the transmission frame to change, resulting in inaccurate measurement results. The four driving components can be controlled to run synchronously, thereby driving the mobile scraper to move, scraping off the impurities attached to the transmission frame, thereby restoring the accuracy of the device. This technical solution has the characteristic of accurate measurement. Although the impurities on the transmission frame are cleaned, the transmission frame will lean towards the position of the protective bin when it is subjected to the pressure of oil, so that the outer side of the transmission frame is away from the mobile scraper, and the mobile scraper cannot clean the transmission frame. In addition, the transmission frame and the protective bin are connected by two support rods, and oil will also enter between the transmission frame and the protective bin, causing both sides of the transmission frame to be subjected to force, which is prone to inaccurate measurement data. Summary of the invention

[0004] The object of the present invention is to provide a downhole optical fiber pressure monitoring device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A downhole optical fiber pressure monitoring device comprises: a device support plate and a mounting rod arranged on the outside of the device support plate, the device support plate is connected to the mounting rod through two clamps, a pressure sensor is fixedly installed on the side of the device support plate away from the mounting rod for detecting the oil pressure in the well, a protective cover is arranged on the outside of the pressure sensor to provide protection for the pressure sensor, and an optical fiber cable extending to the inside of the mounting rod is fixedly installed on the top of the pressure sensor for transmitting measured pressure data; it also includes: a monitoring mechanism for enabling the pressure sensor to be safely monitored downhole, the monitoring mechanism is installed on the inside of the protective cover; a clamping mechanism for quickly assembling the protective cover and the device support plate, the clamping mechanism is installed on the inside of the device support plate; a reinforcement mechanism for reinforcing the protective cover under pressure downhole, the reinforcement mechanism is installed on the inside of the device support plate.

[0006] Preferably, the monitoring mechanism includes a pressure hood slidably mounted on the outside of the protective hood, the outside of the protective hood is provided with an opening for the pressure hood to limit its sliding movement, so that the pressure of the oil can push the pressure hood to move along the opening on the protective hood, and two symmetrically distributed pressure rods are fixedly mounted on the inner side of the pressure hood, and one end of the pressure rod away from the pressure hood contacts the measuring port of the pressure sensor, so that when the pressure hood moves, the pressure rod squeezes the measuring port, which is convenient for the pressure sensor to calculate the pressure, and a limit frame is fixedly mounted on the side of the pressure hood close to the pressure sensor, and arc-shaped protrusions are provided on both sides of the limit frame, and two abutment plates symmetrically arranged on the outer side of the limit frame are fixedly mounted on the inner side of the protective hood, the The outer side of the support plate is in contact with the side of the arc-shaped protrusion away from the inner side of the protective cover. When the support plate is in contact with the arc-shaped protrusion, the limit frame can be in contact with the inner side of the protective cover. A pull rod is fixedly installed on the top of the support plate, and a sleeve is slidably installed on the outer side of the pull rod. The sleeve is fixedly installed on the inner side of the protective cover. A tension spring is fixedly installed between the support plate and the bottom of the sleeve. A telescopic airbag is fixedly installed on the top of the inner side of the protective cover. The bottom of the telescopic airbag is fixedly connected to the top of the pull rod, so that the telescopic airbag can drive the pull rod to move upward when the telescopic airbag is evacuated and contracted. An exhaust pipe is fixedly installed on the outer side of the telescopic airbag for extracting and replenishing the air in the telescopic airbag, and the exhaust pipe extends to the inner side of the mounting rod.

[0007] Preferably, the clamping mechanism includes a protective frame fixedly mounted on the outside of the protective cover, a frame-shaped groove for limiting the insertion of the protective cover is provided on the outside of the device support plate, so as to improve the sealing between the protective cover and the device support plate, four symmetrically distributed plug plates are fixedly mounted on one side of the protective frame close to the device support plate, a slot for limiting the insertion of the plug plates is provided on the outside of the device support plate, two gears distributed vertically and symmetrically are rotatably mounted on the inner side of the device support plate, and clamping plates slidably mounted inside the device support plate are provided on both sides of the gears, and the four clamping plates slide and extend to the four slots respectively. The inner side and the outer side of the plug plate are provided with a card slot for the card plate to limit the insertion, which is used to fix the plug plate and realize the installation between the protective cover and the device support plate. A rack plate matching the gear is fixedly installed on the side of the card plate away from the plug plate, and the two adjacent rack plates are symmetrically distributed along the center. The gear can drive the two rack plates to move in different directions. A rotating drum is rotatably installed inside the device support plate, and a synchronous belt is rotatably installed between the rotating drum and the two gears. Rotating the rotating drum can drive the two gears to rotate synchronously. The interior of the device support plate is also provided with a spring-insertion component that facilitates the quick docking of the card plate and the plug plate.

[0008] The cam is provided with a plurality of positioning strips which are symmetrically distributed on the center of the rotating drum, and a positioning slot is provided on the outer side of the movable rod for limiting the sliding of the positioning strip, so that the movable rod can drive the rotating drum to rotate through the positioning strip. The movable rod extends to the outer side of the device support plate, and the device support plate is fixedly installed with a mounting cylinder on the side close to the clamping hoop, and a pulling block is slidably installed on the inner side of the mounting cylinder, and the movable rod is rotatably installed at one end of the movable rod away from the rotating drum. A sleeve is fixedly installed on the inner side of the mounting cylinder, and two spiral grooves which are symmetrically distributed on the outer side of the movable rod are provided, and a spiral strip which matches the spiral groove on the movable rod is fixedly installed on the inner side of the sleeve. When the movable rod is pulled, the spiral groove on the movable rod can move along the outer side of the spiral strip to realize the self-rotation of the movable rod, and a spring is fixedly installed between the pulling block and the inner side of the mounting cylinder.

[0009] Preferably, a positioning cylinder is slidably mounted on the outer side of the pressure rod, and the positioning cylinder is fixedly mounted on the outer side of the pressure sensor, so as to improve the stability of the movement of the pressure rod and the accuracy of the measurement.

[0010] Preferably, the spring-insertion assembly includes two guide rods symmetrically fixedly installed on one side of the card plate close to the rack plate, a support block for limiting the insertion of the guide rods is fixedly installed inside the device support plate, a second spring is provided on the outer side of the guide rod, the second spring is fixedly installed between the card plate and the support block, the side of the plug plate away from the protective frame is a slope structure, and the card plate is provided with two symmetrically distributed slopes away from the rack plate, so that when the plug plate contacts the card plate, the elasticity of the second spring can be used to insert the card plate into the card slot of the plug plate.

[0011] Preferably, an arc-shaped stopper in contact with the inclined surface of the card plate is fixedly installed in the card slot of the card plate, and the arc-shaped stopper is made of rubber material, so that the card plate can push the card plate to move further through the arc-shaped stopper, thereby tightening the protective cover by the card plate.

[0012] Preferably, a side of the protection frame close to the device support plate is made of rubber material to improve the sealing between the protection frame and the device support plate.

[0013] Preferably, a pull ring is fixedly mounted on a side of the pull block away from the movable rod to facilitate pulling the pull block to move.

[0014] Preferably, a rubber tube is fixedly mounted on one side of the pulling block close to the movable rod, and the outer side of the rubber tube contacts the inner side of the mounting tube, thereby improving the sealing performance between the pulling block and the mounting tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a monitoring mechanism to enable the protective cover to provide protection for the pressure sensor to prevent the oil in the well from directly contacting the pressure sensor. A transmission method is adopted to enable the pressure sensor to measure the pressure of the oil, which is convenient for direct measurement after going down the well, and solves the problem that impurities in the oil need to be repeatedly cleaned, thereby achieving the effect of accurate measurement.

[0016] The present invention uses a clamping mechanism to quickly mount the protective cover on the device support plate in a clamping manner, thereby improving the convenience of mounting and disassembling the protective cover and facilitating the later maintenance of the pressure sensor, thereby achieving the effect of improving the durability of the pressure sensor.

[0017] The present invention uses a reinforcement mechanism to utilize the pressure of the oil to cause a small displacement of the pull block when the protective cover is in the underground oil for a long time, so that the clamping plate can further press the plug plate, thereby realizing automatic tightening of the protective cover, improving the sealing of the protective cover, ensuring the normal operation of the pressure sensor, and thus improving the safety of the pressure sensor underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the pressure detector and the pressure-bearing cover in the present invention; Figure 3 It is a schematic diagram of the structure of the pressure rod and the limit frame in the present invention; Figure 4 It is a schematic diagram of the structure of the telescopic airbag and the abutment block in the present invention; Figure 5 It is a schematic diagram of the structure of the plug board and the card board in the present invention; Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the middle A area; Figure 7 It is a schematic diagram of the structure of the pull block and the installation cylinder in the present invention; Figure 8 It is a schematic diagram of the structure of the spiral strip and the movable rod in the present invention.

[0019] In the figure: 1. device support plate; 2. mounting rod; 3. clamp; 4. pressure sensor; 5. protective cover; 6. optical fiber cable; 7. pressure cover; 8. pressure rod; 9. limit frame; 10. abutment plate; 11. pull rod; 12. sleeve; 13. tension spring; 14. telescopic airbag; 15. exhaust pipe; 16. protective frame; 17. plug plate; 18. gear; 19. card plate; 20. rack plate; 21. rotating drum; 22. synchronous belt; 23. movable rod; 24. positioning strip; 25. mounting cylinder; 26. sleeve; 27. spiral strip; 28. spring one; 29. ​​positioning cylinder; 30. guide rod; 31. support block; 32. spring two; 33. pull block; 34. pull ring; 35. rubber cylinder. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1-Figure 4, a downhole optical fiber pressure monitoring device shown in the figure includes a device support plate 1 and a mounting rod 2 arranged on the outside of the device support plate 1, the device support plate 1 is connected to the mounting rod 2 through two clamps 3, a pressure sensor 4 is fixedly installed on the side of the device support plate 1 away from the mounting rod 2, which is used to detect the oil pressure in the well, a protective cover 5 is arranged on the outside of the pressure sensor 4 to provide protection for the pressure sensor 4, and an optical fiber cable 6 extending to the inside of the mounting rod 2 is fixedly installed on the top of the pressure sensor 4 to transmit the measured pressure data; it also includes: a monitoring mechanism, which is used to enable the pressure sensor 4 to monitor safely underground, and the monitoring mechanism is installed on the inner side of the protective cover 5; a clamping mechanism, which is used to quickly assemble the protective cover 5 and the device support plate 1, and the clamping mechanism is installed on the inner side of the device support plate 1; a reinforcement mechanism, which is used to reinforce the protective cover 5 under pressure underground, and the reinforcement mechanism is installed on the inner side of the device support plate 1.

[0022] The monitoring mechanism includes a pressure hood 7 slidably mounted on the outside of the protective hood 5. An opening is provided on the outside of the protective hood 5 for the pressure hood 7 to slide in a limited position, so that the pressure of the oil can push the pressure hood 7 to move along the opening on the protective hood 5. Two symmetrically distributed pressure rods 8 are fixedly mounted on the inner side of the pressure hood 7. The end of the pressure rod 8 away from the pressure hood 7 contacts the measuring port of the pressure sensor 4, so that when the pressure hood 7 moves, the pressure rod 8 squeezes the measuring port, which is convenient for the pressure sensor 4 to calculate the pressure. A limit frame 9 is fixedly mounted on the side of the pressure hood 7 close to the pressure sensor 4. Both sides of the limit frame 9 are provided with arc-shaped protrusions. Two abutment plates 10 symmetrically arranged on the outer side of the limit frame 9 are fixedly mounted on the inner side of the protective hood 5. The outer side of the abutment plate 10 contacts the side of the arc-shaped protrusion away from the inner side of the protective hood 5. When the abutment plate 10 contacts the arc-shaped protrusion, The limit frame 9 can be brought into contact with the inner side of the protective cover 5. A pull rod 11 is fixedly installed on the top of the abutment plate 10. A sleeve 12 is slidably installed on the outer side of the pull rod 11. The sleeve 12 is fixedly installed on the inner side of the protective cover 5. A tension spring 13 is fixedly installed between the bottom of the abutment plate 10 and the sleeve 12. A telescopic airbag 14 is fixedly installed on the top of the inner side of the protective cover 5. The bottom of the telescopic airbag 14 is fixedly connected to the top of the pull rod 11, so that the telescopic airbag 14 can drive the pull rod 11 to move upward when the telescopic airbag 14 is evacuated and contracted. An exhaust pipe 15 is fixedly installed on the outer side of the telescopic airbag 14 for extracting and replenishing the air in the telescopic airbag 14. The exhaust pipe 15 extends to the inner side of the mounting rod 2. A positioning cylinder 29 is slidably installed on the outer side of the pressure rod 8. The positioning cylinder 29 is fixedly installed on the outer side of the pressure sensor 4 to improve the stability of the movement of the pressure rod 8 and the accuracy of the measurement. The pressure in the downhole oil can push the pressure cover 7 to move, so that the pressure cover 7 squeezes the measuring port of the pressure sensor 4 through the pressure rod 8, so that the pressure sensor 4 can measure the pressure of the oil without contacting the oil, and there is no need to clean the impurities in the oil. Before going down the well, the two abutment plates 10 can abut against the arc-shaped protrusion of the limit frame 9 to achieve the contact between the limit frame 9 and the inner side of the protective cover 5, ensuring that the position of the pressure cover 7 will not be shifted during the process of going down the well. After going down the well, the gas in the telescopic airbag 14 is discharged to keep the abutment plate 10 away from the arc-shaped protrusion, which is convenient for directly measuring the pressure of the oil after going down the well, thereby achieving the effect of accurate measurement.

[0023] Working principle: First, the staff inserts the installation rod 2 into the oil in the well through the conveying equipment. Then, the staff connects the vacuum pump with the end of the vacuum pipe 15 away from the telescopic airbag 14, so that the vacuum pump extracts the gas in the telescopic airbag 14 through the vacuum pipe 15. The bottom of the telescopic airbag 14 drives the pull rod 11 to move upward, and uses the rebound force of the tension spring 13 to make the pull rod 11 and the tension spring 13 quickly pull the abutment plate 10 away from the arc-shaped protrusion on the limit frame 9, so as to unlock the limit frame 9. At this time, the pressure of the oil pushes the pressure cover 7 to move along the opening on the protective cover 5, and the pressure cover 7 is pressed. The cover 7 drives the two pressure rods 8 to move synchronously along the inner side of the positioning tube 29, so that the pressure rods 8 squeeze the measuring port on the pressure sensor 4, so that the pressure sensor 4 calculates the pressure of the oil and transmits the data to the host through the optical fiber cable 6. The staff can obtain the oil data in time, thereby realizing the contactless measurement of the oil pressure by the pressure sensor 4. Through the position change of the pressure cover 7, the real-time monitoring of the oil pressure is realized. There is no need to clean the impurities in the oil, so that the pressure sensor 4 can monitor the oil for a long time, thereby achieving the effect of accurate measurement.

[0024] Example 2: Please refer to Figure 2-Figure 7, this embodiment further explains the first embodiment, the clamping mechanism in the figure includes a protective frame 16 fixedly installed on the outside of the protective cover 5, and a frame-shaped groove for limiting the insertion of the protective cover 5 is opened on the outside of the device support plate 1 to improve the sealing between the protective cover 5 and the device support plate 1. Four symmetrically distributed plug plates 17 are fixedly installed on the side of the protective frame 16 close to the device support plate 1, and a slot for limiting the insertion of the plug plates 17 is opened on the outside of the device support plate 1. Two gears 18 distributed vertically and symmetrically are rotatably installed on the inner side of the device support plate 1. Both sides of the gear 18 are provided with a clamping plate 19 slidably installed inside the device support plate 1, and the four clamping plates 19 slide and extend to the four slots respectively. On the inner side, the outer side of the plug plate 17 is provided with a card slot for the card plate 19 to limit the insertion, which is used to fix the plug plate 17 to achieve the installation between the protective cover 5 and the device support plate 1. The card plate 19 is fixedly installed with a rack plate 20 that cooperates with the gear 18 on the side away from the plug plate 17. The two adjacent rack plates 20 are distributed symmetrically around the center. The gear 18 can drive the two rack plates 20 to move in different directions. A rotating drum 21 is rotatably installed inside the device support plate 1. A synchronous belt 22 is rotatably installed between the rotating drum 21 and the two gears 18. Rotating the rotating drum 21 can drive the two gears 18 to rotate synchronously. The inside of the device support plate 1 is also provided with a spring-insertion component that facilitates the quick docking of the card plate 19 and the plug plate 17.

[0025] In this embodiment: the staff can insert the protective cover 5 into the frame-shaped groove of the device support plate 1, so that the protective frame 16 contacts the outer side of the device support plate 1, and provide a seal for the connection between the device support plate 1 and the protective cover 5 to prevent oil from entering the protective cover 5. In addition, the staff can rotate the rotating drum 21, so that the rotating drum 21 drives the two gears 18 to rotate synchronously through the synchronous belt 22, and the gears 18 drive the two corresponding rack plates 20 to move in opposite directions, so that the rack plate 20 pushes the card plate 19 to insert into the card slot of the plug plate 17, and the card plate 19 can resist the card slot to fix the plug plate 17, thereby achieving the effect of rapid sealing assembly and facilitating later disassembly and maintenance.

[0026] Example 3: Please refer to Figure 5-Figure 8, this embodiment further explains other embodiments. The reinforcement mechanism shown in the figure includes a movable rod 23 slidably installed on the inner side of the rotating drum 21, and a plurality of positioning strips 24 symmetrically distributed in the center are fixedly installed on the inner side of the rotating drum 21. A positioning groove for the positioning strips 24 to limit the sliding of the positioning strips 24 is provided on the outer side of the movable rod 23, so that the movable rod 23 can drive the rotating drum 21 to rotate through the positioning strips 24, and the movable rod 23 extends to the outer side of the device support plate 1, and a mounting cylinder 25 is fixedly installed on the side of the device support plate 1 close to the clamp 3, and a pulling block 33 is slidably installed on the inner side of the mounting cylinder 25. The end of the movable rod 23 away from the rotating drum 21 is rotatably installed on the inner side of the pulling block 33, and a fixing member arranged on the outer side of the movable rod 23 is fixedly installed on the inner side of the mounting cylinder 25. The outer side of the movable rod 23 is provided with two spiral grooves which are symmetrically distributed with respect to the center, and the inner side of the sleeve 26 is fixedly installed with a spiral strip 27 which matches with the spiral groove on the movable rod 23. When the movable rod 23 is pulled, the spiral groove on the movable rod 23 can be moved along the outer side of the spiral strip 27 to realize the rotation of the movable rod 23. A spring 28 is fixedly installed between the pull block 33 and the inner side of the mounting tube 25. A pull ring 34 is fixedly installed on the side of the pull block 33 away from the movable rod 23 to facilitate pulling the pull block 33 to move. A rubber tube 35 is fixedly installed on the side of the pull block 33 close to the movable rod 23. The outer side of the rubber tube 35 contacts the inner side of the mounting tube 25 to improve the sealing between the pull block 33 and the mounting tube 25.

[0027] In this embodiment, the staff can pull the pull block 33 and the rubber tube 35 along the inner side of the installation tube 25 through the pull ring 34 on the pull block 33, so that the pull block 33 drives the movable rod 23 to move along the inner side of the rotating drum 21 and the outer side of the positioning strip 24, and the spiral groove on the movable rod 23 can move along the spiral strip 27 on the sleeve 26, so that the movable rod 23 can be in a rotating state when moving, and the movable rod 23 can drive the rotating drum 21 to rotate through the positioning strip 24, and the rotating drum 21 can realize the synchronous rotation of the two gears 18 through the synchronous belt 22. The four clamping plates 19 can move away from the slots of the device support plate 1, and the staff can pull out or insert the plug plate 17. When the pull block 33 enters the oil, the pressure of the oil can be used to push the pull block 33 to move toward the inside of the installation cylinder 25, so that the pull block 33 drives the rotating cylinder 21 to rotate in the opposite direction through the movable rod 23, and the clamping plate 19 can be against the inner side of the card slot of the plug plate 17, so as to further tighten the plug plate 17, improve the sealing performance of the protective cover 5, ensure the normal operation of the pressure sensor 4, and thus improve the safety of the pressure sensor 4 underground.

[0028] Example 4: Please refer to Figure 2-Figure 8, this embodiment further illustrates other embodiments, the spring-insertion assembly shown in the figure includes two guide rods 30 symmetrically fixedly installed on the side of the card plate 19 close to the rack plate 20, the inner part of the device support plate 1 is fixedly installed with a support block 31 for limiting the insertion of the guide rod 30, and a spring 2 32 is arranged on the outer side of the guide rod 30, and the spring 2 32 is fixedly installed between the card plate 19 and the support block 31, and the side of the plug plate 17 away from the protective frame 16 is an inclined structure, and the card plate 19 is away from the rack plate 20. There are two symmetrically distributed The inclined surface enables the plug plate 17 to utilize the elasticity of the spring 2 32 to insert the card plate 19 into the card slot of the plug plate 17 when it contacts the card plate 19. An arc-shaped stopper in contact with the inclined surface of the card plate 19 is fixedly installed in the card slot of the plug plate 17. The arc-shaped stopper is made of rubber, so that the card plate 19 can push the plug plate 17 to move further through the arc-shaped stopper, thereby achieving the tightening of the protective cover 5 by the plug plate 17. The side of the protective frame 16 close to the device support plate 1 is made of rubber, thereby improving the sealing between the protective frame 16 and the device support plate 1.

[0029] In this embodiment: when the staff inserts the four plug plates 17 into the slots on the device support plate 1, the inclined surface on the plug plate 17 can contact the inclined surface of the card plate 19, so that the plug plate 17 pushes the card plate 19 to move along the inner side of the device support plate 1, and drives the guide rod 30 to move along the inner side of the support block 31, compressing the spring 2 32. When the slot on the plug plate 17 is aligned with the card plate 19, the rebound force of the spring 2 32 is used to make the plug plate 17 directly inserted into the card plate 19, which is convenient for the plug plate 17 to dock with the card plate 19, improves the convenience of installing the protective cover 5, and on the gear 1 When the card plate 19 is pushed to move by the rack plate 20, the inclined surface on the card plate 19 can move along the arc-shaped stopper of the plug plate 17, so that the card plate 19 can pull the plug plate 17 to move, so that the plug plate 17 can pull the protection frame 16 on the protective cover 5 to be close to the outside of the device support plate 1, and squeeze the rubber surface of the protection frame 16, so that the card plate 19 can further press the plug plate 17, so as to realize the automatic tightening of the protective cover 5, improve the sealing performance of the protective cover 5 to the device support plate 1, ensure the normal operation of the pressure sensor 4, and thus improve the safety of the downhole monitoring of the pressure sensor 4.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A downhole optical fiber pressure monitoring device, characterized in that: include: A device support plate (1) and a mounting rod (2) arranged outside the device support plate (1); the device support plate (1) is butted against the mounting rod (2) via two clamps (3); a pressure sensor (4) is fixedly mounted on a side of the device support plate (1) away from the mounting rod (2); a protective cover (5) is arranged on the outside of the pressure sensor (4); and an optical fiber cable (6) extending into the interior of the mounting rod (2) is fixedly mounted on the top of the pressure sensor (4); Also includes: A monitoring mechanism, used to enable the pressure sensor (4) to be safely monitored underground, the monitoring mechanism being installed on the inner side of the protective cover (5); A clamping mechanism, used for quickly assembling the protective cover (5) and the device support plate (1), the clamping mechanism being installed on the inner side of the device support plate (1); A reinforcement mechanism is used to reinforce the protective cover (5) under pressure underground, and the reinforcement mechanism is installed on the inner side of the device support plate (1).

2. A downhole optical fiber pressure monitoring device according to claim 1, characterized in that: The monitoring mechanism comprises a pressure hood (7) slidably mounted on the outside of the protective hood (5), the outside of the protective hood (5) is provided with an opening for limiting the sliding of the pressure hood (7), the inside of the pressure hood (7) is fixedly provided with two symmetrically distributed pressure rods (8), one end of the pressure rods (8) away from the pressure hood (7) contacts the measuring port of the pressure sensor (4), a limit frame (9) is fixedly mounted on the side of the pressure hood (7) close to the pressure sensor (4), both sides of the limit frame (9) are provided with arc-shaped protrusions, and the inside of the protective hood (5) is fixedly provided with two abutment plates (10) symmetrically arranged on the outside of the limit frame (9), the outer side of the abutment plates (10) is provided with a plurality of arc-shaped protrusions, and the inner side of the protective hood (5) is provided with two arc-shaped protrusions, and the outer side of the arc-shaped protrusions are provided with arc-shaped protrusions. The side of the anti-plate (10) contacts the side of the arc-shaped protrusion away from the inner side of the protective cover (5), a pull rod (11) is fixedly installed on the top of the anti-plate (10), a sleeve (12) is slidably installed on the outer side of the pull rod (11), and the sleeve (12) is fixedly installed on the inner side of the protective cover (5), a tension spring (13) is fixedly installed between the anti-plate (10) and the bottom of the sleeve (12), a telescopic airbag (14) is fixedly installed on the top of the inner side of the protective cover (5), the bottom of the telescopic airbag (14) is fixedly connected to the top of the pull rod (11), and an exhaust pipe (15) is fixedly installed on the outer side of the telescopic airbag (14), and the exhaust pipe (15) extends to the inner side of the mounting rod (2).

3. A downhole optical fiber pressure monitoring device according to claim 2, characterized in that: The clamping mechanism comprises a protective frame (16) fixedly mounted on the outside of the protective cover (5); a frame-shaped groove for limiting the insertion of the protective cover (5) is provided on the outside of the device support plate (1); four symmetrically distributed plug plates (17) are fixedly mounted on one side of the protective frame (16) close to the device support plate (1); a slot for limiting the insertion of the plug plates (17) is provided on the outside of the device support plate (1); two gears (18) distributed vertically and symmetrically are rotatably mounted on the inside of the device support plate (1); both sides of the gears (18) are provided with clamping plates (19) slidably mounted inside the device support plate (1); the four clamping plates (19) are fixedly mounted on the side of the protective frame (16) close to the device support plate (1). 9) are respectively slidably extended to the inner sides of the four slots, the outer side of the plug plate (17) is provided with a card slot for the card plate (19) to be limitedly plugged in, a rack plate (20) is fixedly installed on the side of the card plate (19) away from the plug plate (17) and matched with the gear (18), and two adjacent rack plates (20) are symmetrically distributed around the center, a rotating drum (21) is rotatably installed inside the device support plate (1), and a synchronous belt (22) is rotatably installed between the rotating drum (21) and the two gears (18), and a spring-insertion component is also arranged inside the device support plate (1) to facilitate the rapid docking of the card plate (19) and the plug plate (17).

4. A downhole optical fiber pressure monitoring device according to claim 3, characterized in that: The reinforcement mechanism comprises a movable rod (23) slidably mounted on the inner side of the rotating drum (21); a plurality of positioning strips (24) symmetrically distributed in a central direction are fixedly mounted on the inner side of the rotating drum (21); a positioning groove for limiting the sliding of the positioning strips (24) is provided on the outer side of the movable rod (23); the movable rod (23) extends to the outer side of the device support plate (1); a mounting tube (25) is fixedly mounted on one side of the device support plate (1) close to the clamp (3); a pull block (33) is slidably mounted on the inner side of the mounting tube (25); One end of the movable rod (23) away from the rotating cylinder (21) is rotatably mounted on the inner side of the pulling block (33); a sleeve (26) arranged on the outer side of the movable rod (23) is fixedly mounted on the inner side of the mounting cylinder (25); two spiral grooves symmetrically distributed in the center are provided on the outer side of the movable rod (23); a spiral strip (27) matching the spiral groove on the movable rod (23) is fixedly mounted on the inner side of the sleeve (26); and a spring 1 (28) is fixedly mounted between the pulling block (33) and the inner side of the mounting cylinder (25).

5. A downhole optical fiber pressure monitoring device according to claim 2, characterized in that: A positioning cylinder (29) is slidably mounted on the outer side of the pressure rod (8), and the positioning cylinder (29) is fixedly mounted on the outer side of the pressure sensor (4).

6. A downhole optical fiber pressure monitoring device according to claim 3, characterized in that: The spring-insertion assembly comprises two guide rods (30) symmetrically fixedly mounted on a side of the card plate (19) close to the rack plate (20); a support block (31) for limiting and inserting the guide rods (30) is fixedly mounted inside the device support plate (1); a second spring (32) is arranged on the outside of the guide rod (30); the second spring (32) is fixedly mounted between the card plate (19) and the support block (31); a side of the plug plate (17) away from the protective frame (16) is an inclined surface structure; and the card plate (19) away from the rack plate (20) is provided with two symmetrically distributed inclined surfaces.

7. A downhole optical fiber pressure monitoring device according to claim 6, characterized in that: An arc-shaped stopper in contact with the inclined surface of the card plate (19) is fixedly installed in the card slot of the insert plate (17), and the arc-shaped stopper is made of rubber.

8. A downhole optical fiber pressure monitoring device according to claim 3, characterized in that: The side of the protection frame (16) close to the device support plate (1) is made of rubber material.

9. A downhole optical fiber pressure monitoring device according to claim 4, characterized in that: A pull ring (34) is fixedly mounted on a side of the pull block (33) away from the movable rod (23).

10. A downhole optical fiber pressure monitoring device according to claim 4, characterized in that: A rubber tube (35) is fixedly mounted on one side of the pull block (33) close to the movable rod (23), and the outer side of the rubber tube (35) is in contact with the inner side of the mounting tube (25).

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