An oil well downhole pressure monitoring device and monitoring method

Abstract

The present invention relates to the technical field of pressure monitors, and provides an oil well downhole pressure monitoring device and a monitoring method. Among them, an oil well downhole pressure monitoring device includes a connecting sleeve, a supporting and centering mechanism, and a communicating mechanism. A pressure monitoring mechanism is slidably connected to the connecting sleeve. The pressure monitoring mechanism is used to monitor the pressure in the oil well. The supporting and centering mechanism is used to support the inner wall of the oil well. The communicating mechanism is slidably connected to the supporting and centering mechanism. The communicating mechanism is used to connect the pressure monitoring mechanism with the inside of the oil well. Both the communicating mechanism and the supporting and centering mechanism are sleeved on the pressure monitoring mechanism. After the supporting and centering mechanism is opened to support the inner wall of the oil well, the communicating mechanism is opened to connect the inside of the oil well with the pressure monitoring mechanism. Through the above technical solution, the problem that the mechanical pressure gauge in the prior art may fit with the oil well wall when monitoring the pressure downhole in the oil well is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure monitors, and specifically, to an oil well downhole pressure monitoring device and a monitoring method. Background Art

[0002] Pressure monitoring of the oil well downhole is a key link in the processes of oil exploration, development, and production. Its function runs through the entire life cycle of the oil well. Through the pressure monitoring data, the permeability, porosity, and pressure distribution of the oil reservoir can be evaluated, and the recoverable reserves can be calculated. By understanding the production status of the oil well at the moment of pressure change, the production rate can be adjusted. Therefore, whether the pressure downhole can be accurately monitored is crucial for the exploitation of the oil well. The currently used pressure monitoring devices mainly include mechanical pressure gauges, electronic pressure gauges, fiber optic pressure gauges, etc. Among them, the mechanical pressure gauge has the advantages of simple structure, low cost, and high reliability. Although its accuracy and flexibility are relatively low, it is still widely used.

[0003] When using a mechanical pressure gauge, a hoisting device lowers the pressure gauge into the oil well by hoisting. After reaching the depth to be monitored, the pressure is monitored. However, since there are often many impurities attached to the inner wall of the oil well, including impurities such as mud, wax, sand grains, and corrosion products, the impurities may block the pressure gauge during monitoring, resulting in measurement errors. Moreover, since the oil well often has a certain inclination, the pressure gauge may come into contact with the well wall, which will also lead to inaccurate measurement positions and data. Summary of the Invention

[0004] The present invention provides an oil well downhole pressure monitoring device and a monitoring method, which solve the problem that the mechanical pressure gauge in the prior art may be in contact with the oil well wall when monitoring the pressure downhole.

[0005] The technical solution of the present invention is as follows:

[0006] An oil well downhole pressure monitoring device includes a sling, the sling is connected to a hoisting device, and further includes a connecting sleeve, a support and centering mechanism, and a communication mechanism. The connecting sleeve is fixedly connected to the sling. A pressure monitoring mechanism is slidably connected to the connecting sleeve. The pressure monitoring mechanism is used to monitor the pressure in the oil well. The pressure monitoring mechanism includes a sliding sleeve and a fixed seat. The sliding sleeve is slidably connected to the connecting sleeve, the connecting sleeve is disposed inside the sliding sleeve, the fixed seat is fixedly connected to the sliding sleeve, the support and centering mechanism is fixedly connected to the connecting sleeve, and the support and centering mechanism is used to support the inner wall of the oil well. The support and centering mechanism includes support arms and an opening frame assembly. There are multiple support arms, and the multiple support arms are fixedly connected to the side of the connecting sleeve close to the sling. There are multiple opening frame assemblies, and each support arm is connected to the opening frame assembly. The opening frame assembly is used to support the inner wall of the oil well. The communication mechanism is fixedly connected to the pressure monitoring mechanism and is slidably connected to the support and centering mechanism. The communication mechanism is used to connect the pressure monitoring mechanism to the inside of the oil well.

[0007] The pressure monitoring mechanism further includes a protective cylinder. A pressure gauge is fixedly installed on the fixed seat. The protective cylinder is fixedly connected to the fixed seat. The protective cylinder is sleeved on the pressure gauge. A through hole is provided on the side of the protective cylinder close to the fixed seat. A conical wire winding cylinder is provided on the sliding sleeve. The conical wire winding cylinder is fixedly connected to the fixed seat. The centers of the sliding sleeve, the conical wire winding cylinder, and the fixed seat are interconnected.

[0008] A cable is fixedly connected to the pressure gauge. The cable passes through the fixed seat, the conical wire winding cylinder, and the sliding sleeve, and the cable is fixedly connected to the connecting sleeve. When the connecting sleeve slides towards the conical wire winding cylinder in the sliding sleeve, the cable is coiled and stored in the conical wire winding cylinder.

[0009] The support and alignment mechanism further includes a housing and a driving cylinder. The housing is fixedly arranged on the support arm, the housing is sleeved on the opening frame assembly, there are a plurality of driving cylinders, the plurality of driving cylinders are fixedly arranged on the connection mechanism, a support piece is fixedly connected to the output ends of the plurality of driving cylinders, the support piece is fixedly connected to the plurality of support arms, the opening frame assembly includes an opening sleeve, a docking groove, a sliding groove, a support rod and a rack. The opening sleeve is sleeved on the sliding sleeve, the docking groove is formed on the outer side of the opening sleeve, the sliding groove is formed on the opening sleeve, the sliding groove communicates with the docking groove, the support rod is rotatably connected in the sliding groove, a gear is arranged on the support rod, the support rod can be rotated and docked into the docking groove, the rack is slidably connected in the sliding groove, the rack meshes with the gear, the rack is fixedly connected to the support arm, an arc section is arranged at one end of the support rod away from the gear, and a rubber gasket is arranged on the arc section.

[0010] Both the connection mechanism and the support and alignment mechanism are sleeved on the pressure monitoring mechanism. After the support and alignment mechanism is opened to support the inner wall of the oil well, the connection mechanism is opened to connect the inside of the oil well with the pressure monitoring mechanism. The connection mechanism includes a docking barrel and a sliding rod. The docking barrel is fixedly connected to the protection barrel, the docking barrel is slidably connected to the opening sleeve, the sliding rod is fixedly connected to the opening sleeve, the sliding rod is slidably connected to the docking barrel, a spring is sleeved on the sliding rod, and two ends of the spring are respectively fixedly connected to the docking barrel and the opening sleeve. A plurality of communication holes are formed in the docking barrel, and through the communication holes, the pressure gauge can be connected to the oil well.

[0011] An oil well downhole pressure monitoring method uses the above-mentioned oil well downhole pressure monitoring device, and includes the following steps:

[0012] Step 1: Lowering in place: The lifting device lowers the connection sleeve downward in the oil well through the sling, and stops lowering when it reaches the specified height.

[0013] Step 2: Pulling and supporting: The output end of the driving cylinder extends to push the support piece, the support piece pushes the support arm to pull the rack to move, the rack slides in the sliding groove, and the rack drives the gear to rotate.

[0014] Step 3: Supporting and fixing: The gear drives the support rod to rotate, the support rod separates from the docking groove, the rubber gasket contacts the inner wall of the oil well, and when all the support rods contact the inner wall of the oil well, the rack stops sliding.

[0015] Step 4, Connectivity Monitoring: When the rack stops sliding, the output end of the driving cylinder extends to push the docking barrel and the opening sleeve to slide and separate, and the communication hole is separated from the opening sleeve;

[0016] Step 5, Monitoring Completion: The pressure gauge is connected to the oil well through the protective cylinder and the communication hole, and the pressure gauge can perform pressure monitoring. After the detection is completed, the output end of the driving cylinder shortens.

[0017] The working principle and beneficial effects of the present invention are as follows:

[0018] 1. In the present invention, by setting the rack and the support rod, when the driving cylinder pushes the support arm to pull the rack to move, the support rod rotates away from the docking groove. At this time, the support rod intersects with the strip groove on the cover body. When the rack slides, it drives the gears on both sides of the support rod to rotate, causing the support rod to rotate. The arc section on the support rod can support the inner wall of the oil well, reducing the possibility of the support rod slipping on the inner wall of the oil well. After the support rod opens, the rubber gasket contacts the inner wall of the oil well first. Through the rubber gasket, the support rod can contact the inner wall of the oil well at multiple angles, and at the same time, the possibility of the support rod slipping is reduced. In the oil well, due to the accumulation of impurities, the inner diameters at different positions in the oil well may be different. When the rack drives the support rod to rotate to the maximum angle and stops rotating, the docking barrel starts to slide. And because the opening angles of the support rods may be different, the rubber gasket enables the support rod to increase the support stability at various angles. When all four support rods support the inner wall of the oil well, the pressure gauge is at the center of the oil well and will not contact the impurities;

[0019] 2. In the present invention, by setting the support and alignment mechanism, the support rod can support the inner wall of the oil well, keeping the pressure gauge at the center of the oil well and avoiding contact between the pressure gauge and the impurities on the inner wall of the oil well during pressure detection. By setting the communication mechanism, after the support rod supports the pressure gauge at the center of the oil well, the opening sleeve and the oil well can be connected through the communication hole, and then pressure detection can be carried out, avoiding contact with impurities during detection. Description of the Drawings

[0020] The following further elaborates on the present invention in detail in conjunction with the drawings and specific embodiments.

[0021] Figure 1 It is a schematic structural diagram of the overall open state in the present invention;

[0022] Figure 2 It is a schematic structural diagram of the whole in the present invention;

[0023] Figure 3 It is a schematic internal sectional structure diagram of the cooperation between the support arm and the opening sleeve in the present invention;

[0024] Figure 4Schematic internal sectional view of the opening sleeve in the present invention;

[0025] Figure 5 Schematic exploded internal sectional view of the connecting sleeve and the sliding sleeve in the present invention;

[0026] Figure 6 Schematic internal sectional view of the sliding rod cooperating with the driving cylinder in the present invention;

[0027] Figure 7 Schematic internal sectional view of the support rod in the rotating and opening state in the present invention;

[0028] Figure 8 Schematic sectional view of the support rod cooperating with the rack in the present invention;

[0029] Figure 9 Schematic sectional view of the support rod cooperating with the rack from another perspective in the present invention.

[0030] In the figure: 1, sling; 2, connecting sleeve; 3, sliding sleeve; 4, fixed seat; 5, protective cylinder; 6, conical wire winding cylinder; 7, cable; 8, support arm; 9, cover body; 10, driving cylinder; 11, support piece; 12, opening sleeve; 13, docking groove; 14, sliding groove; 15, support rod; 16, rack; 17, docking barrel; 18, sliding rod; 19, spring; 20, communication hole; 21, rubber gasket; 22, pressure gauge. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 making creative efforts fall within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] As Figures 1 to 9As shown in the figure, this embodiment proposes an oil well downhole pressure monitoring device, which includes a sling 1. The sling 1 is connected to a hoisting device. It also includes a connecting sleeve 2, a support and centering mechanism, and a communication mechanism. The connecting sleeve 2 is fixedly connected to the sling 1. A pressure monitoring mechanism is slidably connected to the connecting sleeve 2. The pressure monitoring mechanism is used to monitor the pressure in the oil well. The pressure monitoring mechanism includes a sliding sleeve 3 slidably connected to the connecting sleeve 2. The connecting sleeve 2 is arranged inside the sliding sleeve 3. A fixed seat 4 is fixedly connected to the sliding sleeve 3. The support and centering mechanism is fixedly connected to the connecting sleeve 2. The support and centering mechanism is used to support the inner wall of the oil well. The support and centering mechanism includes multiple support arms 8. The multiple support arms 8 are fixedly connected to the side of the connecting sleeve 2 close to the sling 1. Multiple opening frame assemblies are provided. Each support arm 8 is connected to an opening frame assembly. The opening frame assembly is used to support the inner wall of the oil well. The communication mechanism is fixedly connected to the pressure monitoring mechanism and slidably connected to the support and centering mechanism. The communication mechanism is used to connect the pressure monitoring mechanism to the inside of the oil well.

[0034] As Figures 1 to 5 shown, the pressure monitoring mechanism further includes a protective cylinder 5. A pressure gauge 22 is fixedly installed on the fixed seat 4. The protective cylinder 5 is fixedly connected to the fixed seat 4. The protective cylinder 5 is sleeved on the pressure gauge 22. A through hole is provided on the side of the protective cylinder 5 close to the fixed seat 4. A conical wire winding cylinder 6 is arranged on the sliding sleeve 3. The conical wire winding cylinder 6 is fixedly connected to the fixed seat 4. The centers of the sliding sleeve 3, the conical wire winding cylinder 6, and the fixed seat 4 are interconnected. The pressure gauge 22 is located in the protective cylinder 5, which can prevent the pressure gauge 22 from contacting impurities on the oil well wall. Through the through hole on the protective cylinder 5, the pressure gauge 22 is connected to the outside, without affecting the pressure monitoring.

[0035] As Figures 4 to 6 shown, a cable 7 is fixedly connected to the pressure gauge 22. The cable 7 passes through the fixed seat 4, the conical wire winding cylinder 6, and the sliding sleeve 3. The cable 7 is fixedly connected to the connecting sleeve 2. When the connecting sleeve 2 slides towards the conical wire winding cylinder 6 in the sliding sleeve 3, the cable 7 is curled and stored in the conical wire winding cylinder 6. When the connecting sleeve 2 and the sliding sleeve 3 slide relative to each other, the distance between the connecting sleeve 2 and the pressure gauge 22 changes. The pressure gauge 22 needs to be connected with transmission wires or signal wires. By storing part of the wire in the conical wire winding cylinder 6, the wire can be prevented from being pulled and broken.

[0036] As Figures 4 to 9As shown, the support and alignment mechanism further includes a housing 9 and a driving cylinder 10. The housing 9 is fixedly arranged on the support arm 8. The housing 9 is sleeved on the opening frame assembly. There are multiple driving cylinders 10. The multiple driving cylinders 10 are fixedly arranged on the connecting mechanism. A support piece 11 is fixedly connected to the output ends of the multiple driving cylinders 10. The support piece 11 is fixedly connected to the multiple support arms 8. The opening frame assembly includes an opening sleeve 12, a docking groove 13, a sliding groove 14, a support rod 15 and a rack 16. The opening sleeve 12 is sleeved on the sliding sleeve 3. The docking groove 13 is opened on the outer side of the opening sleeve 12. The sliding groove 14 is opened on the opening sleeve 12. The sliding groove 14 and the docking groove 13 are communicated with each other. The support rod 15 is rotatably connected in the sliding groove 14. A gear is arranged on the support rod 15. The support rod 15 can be rotated and docked into the docking groove 13. The rack 16 is slidably connected in the sliding groove 14. The rack 16 meshes with the gear. The rack 16 is fixedly connected to the support arm 8. An arc section is arranged at one end of the support rod 15 far from the gear. A rubber gasket 21 is arranged on the arc section. In this embodiment, there are four opening frame assemblies and four support arms 8. A strip groove corresponding to the support rod 15 is arranged on the housing 9. When the driving cylinder 10 pushes the support arm 8 to pull the rack 16 to move, the support rod 15 rotates away from the docking groove 13. At this time, the support rod 15 intersects with the strip groove on the housing 9. The rack 16 is arranged on one side of the sliding groove 14 close to the docking groove 13. The support rod 15 passes through the rack 16. When the rack 16 slides, it drives the gears on both sides of the support rod 15 to rotate, so that the support rod 15 rotates. The arc section on the support rod 15 can support the inner wall of the oil well, reducing the possibility of the support rod 15 slipping on the inner wall of the oil well. After the support rod 15 opens, the rubber gasket 21 contacts the inner wall of the oil well first. Through the rubber gasket 21, the support rod 15 can contact the inner wall of the oil well at multiple angles, and at the same time reduces the possibility of the support rod 15 slipping. In the oil well, due to the accumulation of impurities, the inner diameters at different positions in the oil well may be different. When the rack 16 drives the support rod 15 to rotate to the maximum angle and stops rotating, at this time, the docking barrel 17 starts to slide. And because the opening angles of the support rods 15 may be different, the rubber gasket 21 enables the support rod 15 to increase the support stability at multiple angles. When all four support rods 15 support the inner wall of the oil well, at this time, the pressure gauge 22 is in the center of the oil well and will not contact the impurities.

[0037] As Figures 4 to 7As shown, the connecting mechanism and the supporting and straightening mechanism are both sleeved on the pressure monitoring mechanism. After the supporting and straightening mechanism is opened to support the inner wall of the oil well, the connecting mechanism is opened to connect the inside of the oil well with the pressure monitoring mechanism. The connecting mechanism includes a docking barrel 17 and a sliding rod 18. The docking barrel 17 is fixedly connected to the protective tube 5. The docking barrel 17 is slidably connected to the open sleeve 12. The sliding rod 18 is fixedly connected to the open sleeve 12. The sliding rod 18 is slidably connected to the docking barrel 17. A spring 19 is sleeved on the sliding rod 18. The two ends of the spring 19 are respectively fixedly connected to the docking barrel 17 and the open sleeve 12. The docking barrel 17 is provided with a spring 19. There are multiple connecting holes 20, through which the pressure gauge 22 can be connected to the oil well. The spring 19 pulls the docking barrel 17 and the opening sleeve 12, so that when the rack 16 pulls the support rod 15 to rotate and open to support the inner wall of the oil well and cannot rotate, the rack 16 will pull the opening sleeve 12 to slide. At this time, the spring 19 is stretched and elongated to slide the docking barrel 17, and the connecting hole 20 is gradually separated from the opening sleeve 12. At this time, the pressure gauge 22 can monitor the pressure, and when the output end of the driving cylinder 10 is shortened, the spring 19 shortens and can pull the docking barrel 17 and the opening sleeve 12 to slide and reset.

[0038] In this embodiment, by completely sealing the outside of the pressure gauge 22, the pressure gauge 22 can be prevented from contacting with impurities on the inner wall of the oil well during movement and affecting the monitoring results. When placed in a suitable position, the inner wall of the oil well is supported by rotating four support rods 15 to keep the pressure gauge 22 in the center of the oil well. Then the docking barrel 17 is separated from the open sleeve 12, and the connecting hole 20 is opened. At this time, the pressure gauge 22 can detect the pressure inside the oil well. After the pressure gauge 22 is supported to the center of the oil well, the connecting hole 20 is opened, so that impurities will not contact the pressure gauge 22.

[0039] Embodiment 2

[0040] A method for monitoring downhole oil pressure, using the above-mentioned downhole oil pressure monitoring device, comprises the following steps:

[0041] Step 1: Lowering into place: The lifting device lowers the connecting sleeve 2 in the oil well through the sling 1, and stops lowering after it reaches the specified height;

[0042] Step 2: Pull the support apart: the output end of the driving cylinder 10 extends to push the support sheet 11, the support sheet 11 pushes the support arm 8 to pull the rack 16 to move, the rack 16 slides in the sliding groove 14, and the rack 16 drives the gear to rotate;

[0043] Step 3, support and fixation: the gear drives the support rod 15 to rotate, the support rod 15 is separated from the docking groove 13, and the rubber gasket 21 contacts the inner wall of the oil well. When all the support rods 15 are in contact with the inner wall of the oil well, the rack 16 stops sliding;

[0044] Step Four, Connectivity Monitoring: When the rack 16 stops sliding, the output end of the driving cylinder 10 extends to push the docking barrel 17 and the opening sleeve 12 to slide and separate, and the communication hole 20 separates from the opening sleeve 12.

[0045] Step Five, Monitoring Completion: The pressure gauge 22 is connected to the oil well through the protective cylinder 5 and the communication hole 20. The pressure gauge 22 can conduct pressure monitoring. After the detection is completed, the output end of the driving cylinder 10 shortens.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A downhole oil pressure monitoring device, comprising a sling connected to a lifting device, characterized in that: Also includes: The connecting sleeve is fixedly connected to the sling, and a pressure monitoring mechanism is slidably connected to the connecting sleeve. The pressure monitoring mechanism is used to monitor the pressure in the oil well. The pressure monitoring mechanism includes a sliding sleeve and a fixed seat. The sliding sleeve is slidably connected to the connecting sleeve. The connecting sleeve is arranged inside the sliding sleeve, and the fixed seat is fixedly connected to the sliding sleeve. The support and straightening mechanism is fixedly connected to the connecting sleeve, and the support and straightening mechanism is used to support the inner wall of the oil well. The support and straightening mechanism includes a support arm and an open frame assembly. There are multiple support arms, and the multiple support arms are fixedly connected to the side of the connecting sleeve close to the sling. There are multiple open frame assemblies, and each support arm is connected to the open frame assembly, and the open frame assembly is used to support the inner wall of the oil well; the cover body is fixedly arranged on the support arm, and the cover body is sleeved on the open frame assembly; there are multiple drive cylinders, and the multiple drive cylinders are fixedly arranged on the connecting mechanism. Support plates are fixedly connected to the output ends of the multiple drive cylinders, and the support plates are fixedly connected to the multiple support arms; the open frame assembly also includes: a docking groove is arranged on the outer side of the open sleeve; a sliding groove is arranged on the open sleeve, and the sliding groove and the docking groove are connected; a support rod is rotatably connected in the sliding groove, and a gear is arranged on the support rod, and the support rod can be rotatably connected to the docking groove; a rack is slidably connected in the sliding groove, the rack and the gear are meshed, and the rack and the support arm are fixedly connected; The connecting mechanism is fixedly connected to the pressure monitoring mechanism, and is slidably connected to the supporting and straightening mechanism. The connecting mechanism is used to connect the pressure monitoring mechanism with the inside of the oil well. The connecting mechanism and the supporting and straightening mechanism are both sleeved on the pressure monitoring mechanism. After the supporting and straightening mechanism is opened to support the inner wall of the oil well, the connecting mechanism is opened to connect the inside of the oil well with the pressure monitoring mechanism. The opening sleeve is sleeved on the sliding sleeve. The docking barrel is fixedly connected to the protective barrel, and the docking barrel is slidably connected to the open sleeve; the sliding rod is fixedly connected to the open sleeve, and the sliding rod is slidably connected to the docking barrel, and a spring is sleeved on the sliding rod, and the two ends of the spring are respectively fixedly connected to the docking barrel and the open sleeve; a plurality of connecting holes are opened on the docking barrel, and the pressure gauge can be connected to the oil well through the connecting holes; The spring pulls the docking barrel and the opening sleeve, so that when the rack pulls the support rod to rotate and open to support the inner wall of the oil well and cannot rotate, the rack will pull the opening sleeve to slide. At this time, the spring is stretched and elongated to pull the docking barrel to slide, and the connecting hole is gradually separated from the opening sleeve. At this time, the pressure gauge can monitor the pressure, and when the output end of the driving cylinder is shortened, the spring shortens to pull the docking barrel and the opening sleeve to slide and reset; By completely sealing the outside of the pressure gauge, the pressure gauge is prevented from coming into contact with impurities on the inner wall of the oil well during movement, which may affect the monitoring results. When placed in a suitable position, the inner wall of the oil well is supported by rotating four support rods to keep the pressure gauge in the center of the oil well. The docking barrel is then separated from the open sleeve, and the connecting hole is opened. At this time, the pressure gauge can detect the pressure inside the oil well.

2. The oil well downhole pressure monitoring device according to claim 1 is characterized in that: The pressure monitoring mechanism also includes: a pressure gauge fixedly installed on the fixing seat; a protective tube, which is fixedly connected to the fixing seat and sleeved on the pressure gauge, and a through hole is arranged on one side of the protective tube close to the fixing seat.

3. The oil well downhole pressure monitoring device according to claim 2 is characterized in that: A conical wire take-up drum is arranged on the sliding sleeve, the conical wire take-up drum is fixedly connected with the fixing seat, and the sliding sleeve, the conical wire take-up drum and the fixing seat are connected to each other at the center.

4. The oil well downhole pressure monitoring device according to claim 3 is characterized in that: A cable is fixedly connected to the pressure gauge, the cable passes through the fixed seat, the conical take-up drum and the sliding sleeve, and the cable is fixedly connected to the connecting sleeve. When the connecting sleeve slides toward the conical take-up drum in the sliding sleeve, the cable is curled and stored in the conical take-up drum.

5. The oil well downhole pressure monitoring device according to claim 1 is characterized in that: An arc section is arranged on one end of the support rod away from the gear, and a rubber gasket is arranged on the arc section.

6. A method for monitoring downhole oil pressure, using the downhole oil pressure monitoring device according to claim 5, characterized in that: The following steps are involved: S1. Lowering into place: The lifting device lowers the connecting sleeve into the oil well through the sling, and stops lowering after it reaches the specified height; S2. Pull the support apart: the output end of the driving cylinder extends to push the support sheet, the support sheet pushes the support arm to pull the rack to move, the rack slides in the sliding groove, and the rack drives the gear to rotate; S3, support fixation: the gear drives the support rod to rotate, the support rod is separated from the docking groove, and the rubber gasket contacts the inner wall of the oil well. When all the support rods are in contact with the inner wall of the oil well, the rack stops sliding; S4, connection monitoring: when the rack stops sliding, the output end of the drive cylinder extends to push the docking barrel and the open sleeve to slide and separate, and the connecting hole is separated from the open sleeve; S5. Monitoring completed: The pressure gauge is connected to the oil well through the protective tube and the connecting hole. The pressure gauge can monitor the pressure. After the detection is completed, the output end of the drive cylinder is shortened.

Images