An underground optical fiber pressure monitoring device

Abstract

The present invention discloses an underground optical fiber pressure monitoring device, which relates to the field of optical fiber pressure monitoring and solves the problem that the moving scraper on the existing optical fiber pressure monitoring device is difficult to clean the transmission frame. It includes: a device support plate and a mounting rod arranged outside the device support plate. The device support plate is docked with the mounting rod through two clamps. A pressure sensor is fixedly installed on one side of the device support plate away from the mounting rod. A protective cover is arranged outside the pressure sensor. A fiber optic cable extending into the interior of the mounting rod is fixedly installed on the top of the pressure sensor; it further includes: a monitoring mechanism for safely monitoring the pressure sensor underground, and the monitoring mechanism is installed inside the protective cover; through the monitoring mechanism of the present invention, the protective cover provides protection for the pressure sensor, preventing the underground oil from directly contacting the pressure sensor, facilitating direct measurement after being lowered into the well, and thus achieving the effect of accurate measurement.

Description

Technical Field

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

[0002] ‌The underground optical fiber pressure monitor‌ is a device used to measure underground pressure, usually used in underground operation environments such as oil fields and mines. This monitor uses optical fiber technology for pressure measurement, with high measurement accuracy and stability, to judge the production pressure and dynamic changes of the oil field, providing a scientific basis for the production operation of the oil field and being applicable to various complex underground environments.

[0003] Since the oil contains certain impurities, a filter screen is installed outside the optical fiber pressure monitor to filter the impurities in the oil. However, as the impurities increase, the filter screen may become blocked. The existing Chinese published patent document: CN219241898U discloses an underground optical fiber pressure monitoring device for oil wells. During detection, the internal pressure of the oil is transmitted to the pressure sensor through the transmission frame, so as to achieve the operation of collecting internal pressure data. After using it for a period of time, impurities floating in the oil will adhere to the moving scraper, which will cause a change in the surface area of the transmission frame, resulting in inaccurate measurement results. At this time, the four drive components can be controlled to run synchronously, and then drive the moving scraper to move, scraping off the impurities adhering 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, when the transmission frame is subjected to the pressure of the oil, it will lean towards the position of the protection chamber, making the outside of the transmission frame away from the moving scraper, and the moving scraper cannot clean the transmission frame. Moreover, the transmission frame and the protection chamber are connected by two support rods, and the oil will also enter between the transmission frame and the protection chamber, causing both sides of the transmission frame to be stressed, and it is easy to have inaccurate measurement data. Summary of the Invention

[0004] The purpose of the present invention is to provide an underground optical fiber pressure monitoring device to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An underground optical fiber pressure monitoring device, comprising: a device support plate and a mounting rod arranged outside the device support plate. The device support plate is docked with the mounting rod through two hoop fasteners. On one side of the device support plate away from the mounting rod, a pressure sensor is fixedly installed for detecting the oil pressure in the well. A protective cover is arranged outside the pressure sensor to provide protection for the pressure sensor. At the top of the pressure sensor, an optical fiber cable extending into the interior of the mounting rod is fixedly installed for transmitting the measured pressure data; further comprising: a monitoring mechanism for enabling the pressure sensor to perform safe monitoring underground, the monitoring mechanism being installed inside the protective cover; a clamping mechanism for quickly assembling the protective cover and the device support plate, the clamping mechanism being installed inside the device support plate; a reinforcement mechanism for reinforcing the protective cover under pressure underground, the reinforcement mechanism being installed inside the device support plate.

[0007] Preferably, the monitoring mechanism includes a pressure-receiving cover slidably installed outside the protective cover. An opening for limiting the sliding of the pressure-receiving cover is provided on the outside of the protective cover, so that the pressure of the oil can push the pressure-receiving cover to move along the opening on the protective cover. Two symmetrically distributed pressure rods are fixedly installed inside the pressure-receiving cover. One end of the pressure rod away from the pressure-receiving cover is in contact with the measurement port of the pressure sensor. When the pressure-receiving cover moves, the measurement port is squeezed through the pressure rod, facilitating the pressure sensor to calculate the pressure. A limiting frame is fixedly installed on one side of the pressure-receiving cover close to the pressure sensor. Arc-shaped convex blocks are provided on both sides of the limiting frame. Two abutting plates symmetrically arranged outside the limiting frame are fixedly installed inside the protective cover. The outside of the abutting plate is in contact with one side of the arc-shaped convex block away from the inside of the protective cover. When the abutting plate is in contact with the arc-shaped convex block, the limiting frame can be in contact with the inside of the protective cover. A pull rod is fixedly installed on the top of the abutting plate. A sleeve is slidably installed on the outside of the pull rod. The sleeve is fixedly installed inside the protective cover. A tension spring is fixedly installed between the bottom of the abutting plate and the sleeve. A telescopic airbag is fixedly installed on the top inside the protective cover. The bottom of the telescopic airbag is fixedly connected to the top end of the pull rod. When the telescopic airbag is evacuated and shrinks, it can drive the pull rod to move upward. An air extraction pipe is fixedly installed on the outside of the telescopic airbag for extracting and replenishing the air inside the telescopic airbag. The air extraction pipe extends to the inside of the mounting rod.

[0008] Preferably, the card mounting mechanism includes a protective frame fixedly installed on the outside of the protective cover. A frame-shaped groove for the protective cover to be limited and inserted is provided on the outside of the device support plate, which improves the sealing performance between the protective cover and the device support plate. Four symmetrically distributed insertion plates are fixedly installed on one side of the protective frame close to the device support plate. A slot for the insertion plate to be limited and inserted is provided on the outside of the device support plate. Two perpendicularly symmetrically distributed gears are rotatably installed inside the device support plate. Clamping plates are slidably installed on both sides of each gear inside the device support plate. The four clamping plates respectively slide and extend into the inner sides of the four slots. A clamping groove for the clamping plate to be limited and inserted is provided on the outside of the insertion plate, which is used to fix the insertion plate and realize the installation between the protective cover and the device support plate. A rack plate matched with the gear is fixedly installed on one side of the clamping plate away from the insertion plate. The two adjacent rack plates are centrosymmetrically distributed. The gear can drive the two rack plates to move in opposite directions. A rotating cylinder is rotatably installed inside the device support plate. A synchronous belt is rotatably installed between the rotating cylinder and the two gears. Rotating the rotating cylinder can drive the two gears to rotate synchronously. An elastic insertion component for facilitating the quick docking of the clamping plate and the insertion plate is also provided inside the device support plate.

[0009] Preferably, the reinforcement mechanism includes a movable rod slidably installed inside the rotating cylinder. A plurality of centrosymmetrically distributed positioning strips are fixedly installed inside the rotating cylinder. A positioning groove for the positioning strip to be limited and slid is provided on the outside of the movable rod, so that the movable rod can drive the rotating cylinder to rotate through the positioning strip. The movable rod extends to the outside of the device support plate. An installation cylinder is fixedly installed on one side of the device support plate close to the hoop. A pulling block is slidably installed inside the installation cylinder. One end of the movable rod away from the rotating cylinder is rotatably installed inside the pulling block. A sleeve is fixedly installed inside the installation cylinder and arranged on the outside of the movable rod. Two centrosymmetrically distributed spiral grooves are provided on the outside of the movable rod. A spiral strip matched with the spiral groove on the movable rod is fixedly installed inside the sleeve. When the movable rod is pulled, the spiral groove on the movable rod can move along the outside of the spiral strip to realize the self-rotation of the movable rod. A first spring is fixedly installed between the pulling block and the inside of the installation cylinder.

[0010] Preferably, a positioning cylinder is slidably installed on the outside of the pressure rod. The positioning cylinder is fixedly installed on the outside of the pressure sensor, which improves the smoothness of the movement of the pressure rod and the measurement accuracy.

[0011] Preferably, the elastic plugging component includes two guiding rods symmetrically and fixedly installed on one side of the clamping plate close to the rack plate. A supporting block for limiting and plugging the guiding rods is fixedly installed inside the device support plate. A second spring is arranged outside the guiding rods and is fixedly installed between the clamping plate and the supporting block. The side of the plug plate away from the protective frame is of an inclined surface structure. Two symmetrically distributed inclined surfaces are provided on the clamping plate away from the rack plate, enabling the clamping plate to be inserted into the slot of the plug plate by using the elasticity of the second spring when the plug plate contacts the clamping plate.

[0012] Preferably, an arc-shaped abutting block in contact with the inclined surface of the clamping plate is fixedly installed in the slot of the plug plate. The arc-shaped abutting block is made of rubber, enabling the clamping plate to push the plug plate to move further through the arc-shaped abutting block, realizing the tightening of the protective cover by the plug plate.

[0013] Preferably, the side of the protective frame close to the device support plate is made of rubber, improving the sealing performance between the protective frame and the device support plate.

[0014] Preferably, a pull ring is fixedly installed on the side of the pull block away from the movable rod, facilitating the pulling of the pull block to move.

[0015] Preferably, a rubber cylinder is fixedly installed on the side of the pull block close to the movable rod, and the outer side of the rubber cylinder is in contact with the inner side of the installation cylinder, improving the sealing performance between the pull block and the installation cylinder.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] Through the monitoring mechanism, the present invention provides protection for the pressure sensor by the protective cover, preventing the underground oil from directly contacting the pressure sensor. By adopting a transmission method, the pressure sensor measures the pressure of the oil, facilitating direct measurement after being lowered into the well, and solving the problem of repeated cleaning of impurities in the oil, thereby achieving the effect of accurate measurement.

[0018] Through the clamping mechanism, the present invention quickly installs the protective cover on the device support plate by means of clamping, improving the convenience of installation and disassembly of the protective cover, facilitating the later maintenance of the pressure sensor, and thereby achieving the effect of improving the durability of the pressure sensor.

[0019] Through the reinforcement mechanism, when the protective cover is in the underground oil for a long time, the pressure of the oil can cause a small displacement of the pull block, enabling the clamping plate to further press the plug plate, realizing the automatic tightening of the protective cover, improving the sealing performance of the protective cover, ensuring the normal operation of the pressure sensor, and thereby improving the safety of the pressure sensor underground. Description of the Drawings

[0020] Figure 1Schematic diagram of the overall structure of the present invention;

[0021] Figure 2 Schematic diagram of the pressure detector and the pressure-receiving cover structure in the present invention;

[0022] Figure 3 Schematic diagram of the pressure rod and the limit frame structure in the present invention;

[0023] Figure 4 Schematic diagram of the telescopic airbag and the abutting block structure in the present invention;

[0024] Figure 5 Schematic diagram of the plug board and the clamping board structure in the present invention;

[0025] Figure 6 is Figure 5 Schematic diagram of the enlarged structure of area A in;

[0026] Figure 7 Schematic diagram of the pulling block and the mounting cylinder structure in the present invention;

[0027] Figure 8 Schematic diagram of the spiral bar and the movable rod structure in the present invention.

[0028] In the figure: 1, device support plate; 2, mounting rod; 3, hoop; 4, pressure sensor; 5, protective cover; 6, optical fiber cable; 7, pressure-receiving cover; 8, pressure rod; 9, limit frame; 10, abutting plate; 11, pull rod; 12, sleeve; 13, tension spring; 14, telescopic airbag; 15, air extraction pipe; 16, protective frame; 17, plug board; 18, gear; 19, clamping board; 20, rack plate; 21, rotating cylinder; 22, synchronous belt; 23, movable rod; 24, positioning strip; 25, mounting cylinder; 26, sleeve; 27, spiral bar; 28, spring one; 29, positioning cylinder; 30, guide rod; 31, support block; 32, spring two; 33, pulling block; 34, pull ring; 35, rubber cylinder. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1: Please refer to Figures 1-4, A downhole optical fiber pressure monitoring device in the illustration, including a device support plate 1 and a mounting rod 2 arranged outside the device support plate 1. The device support plate 1 is docked with the mounting rod 2 through two clamps 3. On the side of the device support plate 1 away from the mounting rod 2, a pressure sensor 4 is fixedly installed for detecting the oil pressure in the well. A protective cover 5 is arranged outside the pressure sensor 4 to provide protection for the pressure sensor 4. At the top of the pressure sensor 4, an optical fiber cable 6 extending into the interior of the mounting rod 2 is fixedly installed for transmitting the measured pressure data; further including: a monitoring mechanism for enabling the pressure sensor 4 to perform safe monitoring downhole, the monitoring mechanism is installed inside the protective cover 5; a clamping mechanism for quickly assembling the protective cover 5 and the device support plate 1, the clamping mechanism is installed inside the device support plate 1; a reinforcement mechanism for reinforcing the protective cover 5 under pressure downhole, the reinforcement mechanism is installed inside the device support plate 1.

[0031] The monitoring mechanism includes a pressure-receiving cover 7 slidably installed outside the protective cover 5. An opening for limiting the sliding of the pressure-receiving cover 7 is provided on the outside of the protective cover 5, so that the pressure of the oil can push the pressure-receiving cover 7 to move along the opening on the protective cover 5. Two symmetrically distributed pressure rods 8 are fixedly installed inside the pressure-receiving cover 7. The end of the pressure rod 8 away from the pressure-receiving cover 7 is in contact with the measurement port of the pressure sensor 4. When the pressure-receiving cover 7 moves, the measurement port is squeezed through the pressure rod 8, which is convenient for the pressure sensor 4 to calculate the pressure. A limiting frame 9 is fixedly installed on the side of the pressure-receiving cover 7 close to the pressure sensor 4. Arc-shaped protrusions are provided on both sides of the limiting frame 9. Two abutting plates 10 symmetrically arranged outside the limiting frame 9 are fixedly installed inside the protective cover 5. The outside of the abutting plate 10 is in contact with the side of the arc-shaped protrusion away from the inside of the protective cover 5. When the abutting plate 10 is in contact with the arc-shaped protrusion, the limiting frame 9 can be in contact with the inside of the protective cover 5. A pull rod 11 is fixedly installed on the top of the abutting plate 10. A sleeve 12 is slidably installed on the outside of the pull rod 11. The sleeve 12 is fixedly installed inside the protective cover 5. A tension spring 13 is fixedly installed between the bottom of the abutting plate 10 and the sleeve 12. A telescopic airbag 14 is fixedly installed on the top inside the protective cover 5. The bottom of the telescopic airbag 14 is fixedly connected to the top end of the pull rod 11. When the telescopic airbag 14 is pumped and shrunk, the pull rod 11 can be driven to move upward. An air extraction pipe 15 is fixedly installed on the outside of the telescopic airbag 14 for extracting and replenishing the air inside the telescopic airbag 14. The air extraction pipe 15 extends into the interior of the mounting rod 2. A positioning cylinder 29 is slidably installed on the outside of the pressure rod 8. The positioning cylinder 29 is fixedly installed on the outside of the pressure sensor 4 to improve the smooth movement of the pressure rod 8 and the measurement accuracy;

[0032] The pressure inside the downhole oil can push the pressure-receiving cover 7 to move, so that the pressure-receiving cover 7 squeezes the measurement port of the pressure sensor 4 through the pressure rod 8, enabling the pressure sensor 4 to measure the pressure of the oil without contacting the oil, without the need to clean the impurities in the oil. Before going down the well, the two abutting plates 10 can abut against the arc-shaped protrusions of the limit frame 9, realizing the contact between the limit frame 9 and the inner side of the protective cover 5, ensuring that the position of the pressure-receiving cover 7 will not shift during the process of going down the well. After going down the well, the gas in the telescopic airbag 14 is discharged, making the abutting plate 10 move away from the arc-shaped protrusion, facilitating the direct measurement of the oil pressure after going down the well, thus achieving the effect of accurate measurement.

[0033] Working principle: First, the staff inserts the installation rod 2 into the downhole oil through the conveying equipment. Then, the staff docks the air extractor with the end of the air extraction pipe 15 far from the telescopic airbag 14, so that the air extractor extracts the gas in the telescopic airbag 14 through the air extraction pipe 15. The bottom of the telescopic airbag 14 drives the pull rod 11 to move upward, and using the resilience of the tension spring 13, the pull rod 11 and the tension spring 13 quickly pull the abutting plate 10 away from the arc-shaped protrusion on the limit frame 9, realizing the unlocking of the limit frame 9. At this time, the pressure of the oil pushes the pressure-receiving cover 7 to move along the opening on the protective cover 5, and the pressure-receiving cover 7 drives the two pressure rods 8 to move synchronously along the inside of the positioning cylinder 29, so that the pressure rods 8 squeeze the measurement port on the pressure sensor 4, enabling the pressure sensor 4 to calculate the pressure of the oil and transmit the data to the host through the optical fiber cable 6. The staff can then obtain the data of the oil in a timely manner. Thus, the non-contact measurement of the oil pressure by the pressure sensor 4 is realized, and the real-time monitoring of the oil pressure is achieved through the position change of the pressure-receiving cover 7. There is no need to clean the impurities in the oil, enabling the pressure sensor 4 to monitor the oil for a long time, thus achieving the effect of accurate measurement.

[0034] Embodiment 2: Please refer to Figures 2-7, 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.

[0035] 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.

[0036] Example 3: Please refer to Figures 5-8, this embodiment further illustrates other embodiments. The reinforcement mechanism shown in the figure includes a movable rod 23 slidably installed inside the rotating cylinder 21. A plurality of positioning bars 24 distributed centrosymmetrically are fixedly installed inside the rotating cylinder 21. A positioning groove for the positioning bars 24 to be limited and slide is provided on the outer side of the movable rod 23, enabling the movable rod 23 to drive the rotating cylinder 21 to rotate through the positioning bars 24. The movable rod 23 extends to the outside of the device support plate 1. A mounting cylinder 25 is fixedly installed on one side of the device support plate 1 close to the hoop 3. A pulling block 33 is slidably installed inside the mounting cylinder 25. One end of the movable rod 23 far from the rotating cylinder 21 is rotatably installed inside the pulling block 33. A sleeve 26 arranged on the outer side of the movable rod 23 is fixedly installed inside the mounting cylinder 25. Two helical grooves distributed centrosymmetrically are provided on the outer side of the movable rod 23. A helical strip 27 matched with the helical groove on the movable rod 23 is fixedly installed inside the sleeve 26. When pulling the movable rod 23, the helical groove on the movable rod 23 can move along the outer side of the helical strip 27, realizing the self-rotation of the movable rod 23. A first spring 28 is fixedly installed between the pulling block 33 and the inner side of the mounting cylinder 25. A pull ring 34 is fixedly installed on one side of the pulling block 33 far from the movable rod 23, facilitating the movement of the pulling block 33. A rubber cylinder 35 is fixedly installed on one side of the pulling block 33 close to the movable rod 23. The outer side of the rubber cylinder 35 is in contact with the inner side of the mounting cylinder 25, improving the sealing performance between the pulling block 33 and the mounting cylinder 25.

[0037] In this embodiment: The staff can pull the pulling block 33 and the rubber cylinder 35 along the inner side of the mounting cylinder 25 through the pull ring 34 on the pulling block 33, enabling the pulling block 33 to drive the movable rod 23 to move along the inner side of the rotating cylinder 21 and the outer side of the positioning bars 24. The helical groove on the movable rod 23 can move along the helical strip 27 on the sleeve 26, enabling the movable rod 23 to be in a rotating state when moving. The movable rod 23 can drive the rotating cylinder 21 to rotate through the positioning bars 24. The rotating cylinder 21 can realize the synchronous rotation of the two gears 18 through the synchronous belt 22. Thus, the four clamping plates 19 can move away from the slots on the device support plate 1, and the staff can pull out or insert the insertion plate 17. When the pulling block 33 enters the oil, the pressure of the oil can be used to push the pulling block 33 to move towards the inner side of the mounting cylinder 25, enabling the pulling block 33 to drive the rotating cylinder 21 to rotate in the reverse direction through the movable rod 23. The clamping plates 19 can be pressed against the inner side of the card slot of the insertion plate 17, realizing the further tightening of the insertion plate 17, improving the sealing performance of the protective cover 5, ensuring the normal operation of the pressure sensor 4, and thus improving the safety of the pressure sensor 4 underground.

[0038] Embodiment 4: Please refer to Figures 2-8, this embodiment further elaborates on other embodiments. The snap-in component in the figure includes two guide rods 30 symmetrically and fixedly installed on the side of the clamping plate 19 close to the rack plate 20. Inside the device support plate 1, there is a support block 31 fixedly installed for the limit insertion of the guide rod 30. On the outer side of the guide rod 30, there is a second spring 32, and the second spring 32 is fixedly installed between the clamping plate 19 and the support block 31. The side of the insertion plate 17 away from the protective frame 16 is a bevel structure. On the side of the clamping plate 19 away from the rack plate 20, there are two symmetrically distributed bevels. When the insertion plate 17 comes into contact with the clamping plate 19, the elasticity of the second spring 32 can be utilized to insert the clamping plate 19 into the card slot of the insertion plate 17. An arc-shaped abutting block in contact with the bevel of the clamping plate 19 is fixedly installed in the card slot of the insertion plate 17. The arc-shaped abutting block is made of rubber, enabling the clamping plate 19 to push the insertion plate 17 to move further through the arc-shaped abutting block, realizing the tightening of the protective cover 5 by the insertion plate 17. The side of the protective frame 16 close to the device support plate 1 is made of rubber, improving the sealing performance between the protective frame 16 and the device support plate 1.

[0039] In this embodiment: When the staff inserts the four insertion plates 17 into the card slots on the device support plate 1, the bevel on the insertion plate 17 can come into contact with the bevel on the clamping plate 19, causing the insertion plate 17 to push the clamping plate 19 to move along the inner side of the device support plate 1 and drive the guide rod 30 to move along the inner side of the support block 31, compressing the second spring 32. When the card slot on the insertion plate 17 aligns with the clamping plate 19, using the resilience of the second spring 32, the insertion plate 17 can be directly inserted into the clamping plate 19, facilitating the docking of the insertion plate 17 and the clamping plate 19 and improving the convenience of installing the protective cover 5. Moreover, when the gear 18 pushes the clamping plate 19 to move through the rack plate 20, the bevel on the clamping plate 19 can move along the arc-shaped abutting block of the insertion plate 17, enabling the clamping plate 19 to pull the insertion plate 17 to move, causing the insertion plate 17 to pull the protective frame 16 on the protective cover 5 to closely adhere to the outer side of the device support plate 1, squeezing the rubber surface of the protective frame 16, enabling the clamping plate 19 to further press the insertion plate 17, realizing the automatic tightening of the protective cover 5, improving the sealing performance of the protective cover 5 for the device support plate 1, ensuring the normal operation of the pressure sensor 4, and thus enhancing the safety of the downhole monitoring of the pressure sensor 4.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and 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: The device support plate and the mounting rod arranged outside the device support plate are 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. A protective cover is arranged on the outside of the pressure sensor. An optical fiber cable extending to the inside of the mounting rod is fixedly installed on the top of the pressure sensor. Also includes: The monitoring mechanism is used to enable the pressure sensor to monitor safely underground. The monitoring mechanism is installed on the inner side of the protective cover. The monitoring mechanism includes a pressure cover slidably installed on the outer side of the protective cover. An opening for the pressure cover to limit the sliding of the pressure cover is opened on the outer side of the protective cover. Two symmetrically distributed pressure rods are fixedly installed on the inner side of the pressure cover. One end of the pressure rod away from the pressure cover contacts the measuring port of the pressure sensor. A limit frame is fixedly installed on the side of the pressure cover close to the pressure sensor. Arc-shaped protrusions are opened on both sides of the limit frame. The inner side of the protective cover is fixed with a pressure rod. Two abutment plates are fixedly installed and are symmetrically arranged on the outside of the limit frame. The outside of the abutment plates contacts the side of the arc-shaped protrusion away from the inside of the protective cover. A pull rod is fixedly installed on the top of the abutment plates. A sleeve is slidably installed on the outside of the pull rod. The sleeve is fixedly installed on the inside of the protective cover. A tension spring is fixedly installed between the bottom of the abutment plates and the sleeve. A telescopic airbag is fixedly installed on the top of the inside of the protective cover. The bottom of the telescopic airbag is fixedly connected to the top of the pull rod. An exhaust pipe is fixedly installed on the outside of the telescopic airbag. The exhaust pipe extends to the inside of the mounting rod. The clamping mechanism is used for quickly assembling the protective cover and the device support plate, and the clamping mechanism is installed on the inner side of the device support plate; The reinforcement mechanism is used to reinforce the protective cover under pressure underground, and the reinforcement mechanism is installed on the inner side of the device support plate.

2. A downhole optical fiber pressure monitoring device according to claim 1, characterized in that: The clamping mechanism includes a protective frame fixedly installed on the outside of the protective cover, a frame-shaped groove for limiting the insertion of the protective cover is opened on the outside of the device support plate, four symmetrically distributed plug-in plates are fixedly installed on the side of the protective frame close to the device support plate, a slot for limiting the insertion of the plug-in plates is opened on the outside of the device support plate, two gears distributed vertically and symmetrically are rotatably installed on the inner side of the device support plate, and card plates slidably installed inside the device support plate are arranged on both sides of the gear, and the four card plates slide and extend to the inner sides of the four slots respectively, and a card slot for limiting the insertion of the card plate is opened on the outside of the plug-in plate, and a rack plate matching the gear is fixedly installed on the side of the card plate away from the plug-in plate, and two adjacent rack plates are symmetrically distributed in the center, 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, and a spring-insertion component is also arranged inside the device support plate for facilitating rapid docking of the card plate and the plug-in plate.

3. A downhole optical fiber pressure monitoring device according to claim 2, characterized in that: The reinforcing mechanism includes a movable rod slidably installed on the inner side of the rotating drum, a plurality of positioning strips symmetrically distributed in the center are fixedly installed on the inner side of the rotating drum, a positioning groove for limiting the sliding of the positioning strip is opened on the outer side of the movable rod, the movable rod extends to the outer side of the device support plate, a mounting cylinder is fixedly installed on the side of the device support plate close to the clamp, a pulling block is slidably installed on the inner side of the mounting cylinder, the end of the movable rod away from the rotating drum is rotatably installed on the inner side of the pulling block, a sleeve arranged on the outer side of the movable rod is fixedly installed on the inner side of the mounting cylinder, two spiral grooves symmetrically distributed in the center are opened on the outer side of the movable rod, a spiral strip matching the spiral groove on the movable rod is fixedly installed on the inner side of the sleeve, and a spring is fixedly installed between the pulling block and the inner side of the mounting cylinder.

4. A downhole optical fiber pressure monitoring device according to claim 1, characterized in that: 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.

5. A downhole optical fiber pressure monitoring device according to claim 2, characterized in that: 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 arranged on the outer side of the guide rod, and 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 away from the rack plate has two symmetrically distributed slopes.

6. A downhole optical fiber pressure monitoring device according to claim 5, characterized in that: An arc-shaped abutment block in contact with the inclined surface of the card plate is fixedly installed in the card slot of the plug plate, and the arc-shaped abutment block is made of rubber material.

7. A downhole optical fiber pressure monitoring device according to claim 2, characterized in that: The side of the protection frame close to the device support plate is made of rubber material.

8. A downhole optical fiber pressure monitoring device according to claim 3, characterized in that: A pull ring is fixedly installed on one side of the pull block away from the movable rod.

9. A downhole optical fiber pressure monitoring device according to claim 3, characterized in that: 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.

Images