A centering support device for a logging instrument in a high temperature and high pressure environment downhole

Abstract

The application belongs to the technical field of well logging instrument supporting device, in particular to a centering supporting device for well logging instrument in high temperature and high pressure environment, which comprises a plurality of circumferentially arrayed adjusting housings, a plurality of the adjusting housings are concentrically installed with the well logging instrument, an ultrasonic transducer is fixedly connected to the middle of each of the adjusting housings, the ultrasonic transducer is used for emitting ultrasonic waves to the well wall and recovering waves, a thrust executing mechanism is installed in the adjusting housing, the thrust executing mechanism pushes the well logging instrument to the center of the well by exerting thrust, the position of the well logging instrument is adjusted by cooperating with the thrust executing mechanism, the well logging instrument is ensured to be in the center of the well, the whole process does not need to be in direct contact with the well wall, and the phenomenon of jamming and wear will not occur, the thrust executing mechanism can effectively expand the variable diameter range, and the wellbore shape can also be sensed in real time, and the inherent defects of the existing centralizer such as wear, sticking, poor adaptability and the like are solved.

Description

Technical Field

[0001] This invention belongs to the technical field of logging instrument support devices, specifically a centering support device for logging instruments in downhole high-temperature and high-pressure environments. Background Technology

[0002] Well logging is a crucial step in the exploration and development of oil and gas. By deploying logging instruments in the wellbore or casing well, physical parameters such as electrical, acoustic, and nuclear parameters of the formation are measured to determine the oil and gas content and reservoir characteristics. When the logging instruments are working downhole, it is necessary to ensure their centering to guarantee the accuracy and reliability of the measurement data.

[0003] Currently, the existing technology for centering logging instruments mainly relies on mechanical centralizers. The basic working principle is to use springs or bow-shaped springs to push the centralizer arm outward, so that the roller directly presses against the well wall, thereby passively constraining the instrument to the center of the wellbore.

[0004] The above solutions are generally applicable in vertical wells and under conventional operating conditions, but they reveal many inherent defects in highly deviated wells, horizontal wells, and irregular wellbores: First, the rollers are in continuous contact with the well wall, resulting in severe wear, especially in hard formations or sand-containing mud, which significantly shortens the lifespan of the centralizing arm and rollers. Secondly, the spring has limited adaptability when the well diameter changes, and the range of diameter change is small. In severe cases, insufficient uprighting force leads to instrument eccentricity, which directly affects the measurement accuracy of key parameters such as acoustic transit time and resistivity. Third, there is a high risk of getting stuck. Once the straightening arm gets stuck on the well wall steps or where rock cuttings accumulate, it is extremely difficult to lift and lower it, and may even cause an engineering accident. Fourth, the existing centralizers have a single function, only providing support and lacking the ability to actively sense the wellbore shape and actively adjust their posture.

[0005] Therefore, the present invention provides a centering support device for logging instruments in downhole high-temperature and high-pressure environments. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a centering support device for logging instruments in a downhole high temperature and high pressure environment, comprising multiple adjusting shells arranged in a circumferential array. The multiple adjusting shells are concentrically installed with the logging instrument. An ultrasonic transducer is fixedly connected to the center of each of the multiple adjusting shells. The ultrasonic transducer is used to emit ultrasonic waves to the well wall and recover the waves. A thrust actuator is installed inside the adjusting shell. The thrust actuator pushes the logging instrument to the center of the well by applying thrust. The thrust actuator includes air storage chambers located on the upper and lower sides inside the regulating housing. A pair of high-pressure nozzles are fixed inside the regulating housing and at the end of the air storage chamber near the ultrasonic transducer. The pair of high-pressure nozzles are respectively connected to the two air storage chambers. A first solenoid valve is installed inside the high-pressure nozzles. A pressurization component is provided on the side of the air storage chamber away from the center of the regulating housing.

[0008] Preferably, the pressurization assembly includes a pressurization plug slidably connected inside the gas storage chamber, and a servo assembly is threadedly connected to the side of the pressurization plug away from the gas storage chamber, the servo assembly being used to drive the pressurization plug to reciprocate.

[0009] Preferably, a spare gas chamber is provided inside the regulating housing and on both sides of the gas storage chamber. A connecting hole is provided inside the regulating housing to connect the gas storage chamber and the spare gas chamber. A second solenoid valve is installed inside the connecting hole. A spare gas cylinder is installed outside the gas storage chamber and at the corresponding position of the spare gas chamber.

[0010] Preferably, clamping rings are fixedly connected to the exterior of the multiple spare gas cylinders on the upper and lower sides, and limiting seats are fixedly connected to the side of the multiple spare gas cylinders on the upper and lower sides away from the adjusting housing.

[0011] Preferably, the limiting seat has a chamfer on the side away from the adjusting housing, and the interior of the limiting seat is connected by multiple limiting bolts via threads.

[0012] Preferably, a first pressure sensor is installed on the outside of the regulating housing, and a second pressure sensor is installed inside the air storage chamber. An internal pressure regulating mechanism is installed on the side of the second pressure sensor near the center of the regulating housing.

[0013] Preferably, the internal pressure regulating mechanism includes a magnetic piston fixedly connected to the second pressure sensor. The magnetic piston is slidably connected to the gas storage chamber and is located on the side of the high-pressure nozzle near the center of the regulating housing. A transmission rod is fixedly connected to the side of the magnetic piston away from the pressurizing plug, and an electromagnet is slidably connected to the side of the transmission rod away from the magnetic piston. The pressurizing plug is in the shape of an "I".

[0014] Preferably, multiple rotating seats are fixedly connected to the outside of both clamping rings, and a support rod is rotatably connected to the middle of each of the multiple rotating seats. The support rods are hinged to each other and are rotatably connected to each other.

[0015] Preferably, the servo component is covered with a protective shell, one end of which is fixedly connected to a clamping ring, and the other end of which is fixedly connected to an adjustment shell with an elastic sleeve. Multiple permanent magnets are fixedly connected inside the clamping ring.

[0016] Preferably, a limiting shaft is fixedly connected to the side of the support rod near the adjusting housing, and a flow-blocking fan blade is rotatably connected to the outside of the limiting shaft. A scraping strip is fixedly connected to the side of the flow-blocking fan blade near the adjusting housing.

[0017] The beneficial effects of this invention are as follows: 1. The present invention discloses a centering support device for logging instruments in a downhole high-temperature and high-pressure environment. This device uses ultrasonic transducers to emit and receive ultrasonic waves from the wellbore, dynamically determining the distance between each ultrasonic transducer and the wellbore. When the well diameter changes or the logging instrument is not centered, the data from the ultrasonic transducers sends a command to the corresponding thrust actuator. The thrust adjusts the position of the logging instrument, ensuring it is centered in the well. The entire process does not require direct contact with the wellbore, preventing jamming and wear. Furthermore, the thrust actuator effectively expands the range of diameter changes and allows for real-time monitoring of the wellbore morphology, solving the inherent defects of existing centering devices such as wear, stuck drill bits, and poor adaptability.

[0018] 2. The invention provides a centering support device for logging instruments in a downhole high-temperature and high-pressure environment. The device uses a first pressure sensor to detect the pressure data inside the well and a second pressure sensor to detect the pressure data inside the gas storage chamber. These two sets of pressure data are transmitted to a data processing system in real time. Based on these two sets of data, the data processing system sends instructions to the internal pressure adjustment mechanism to dynamically adjust the pressure inside the gas storage chamber, thereby improving the stability of the device operation. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is an installation effect diagram of the present invention installed on a well logging instrument; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the clamping ring structure in this invention; Figure 4 This is a schematic diagram of the adjustable housing structure in this invention; Figure 5 This is the main view of the adjustable shell structure in this invention; Figure 6 This is a partial cross-sectional view of the adjusting housing in this invention; Figure 7 This is a schematic diagram of the gas storage cavity structure in this invention; Figure 8 This is a schematic diagram of the support rod structure in this invention; Figure 9 This is a schematic diagram of the flow-blocking fan blade structure in this invention; In the diagram: 1. Adjustment housing; 2. Ultrasonic transducer; 3. Gas storage chamber; 4. High-pressure nozzle; 5. Pressurizing plug; 6. Servo component; 7. Spare gas cylinder; 8. Connecting hole; 9. Clamping ring; 10. Limiting seat; 11. Limiting bolt; 12. First pressure sensor; 13. Second pressure sensor; 14. Magnetic piston; 15. Transmission rod; 16. Electromagnet; 17. Rotating seat; 18. Support rod; 19. Friction wheel; 20. Limiting shaft; 21. Flow-blocking fan blade; 22. Scraper strip; 23. Elastic sleeve; 24. Protective shell; 25. Permanent magnet. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 7 As shown in the embodiment of the present invention, a centering support device for logging instruments in a downhole high-temperature and high-pressure environment includes multiple adjusting housings 1 arranged in a circumferential array. The multiple adjusting housings 1 are installed concentrically with the logging instrument. An ultrasonic transducer 2 is fixedly connected to the center of each of the multiple adjusting housings 1. The ultrasonic transducer 2 is used to emit ultrasonic waves to the well wall and receive the waves. A thrust actuator is installed inside the adjusting housing 1. The thrust actuator applies thrust to push the logging instrument to the center of the well. The thrust actuator includes air storage chambers 3 located on the upper and lower sides inside the regulating housing 1. A pair of high-pressure nozzles 4 are fixed inside the regulating housing 1 and at one end of the air storage chamber 3 near the ultrasonic transducer 2. The pair of high-pressure nozzles 4 are respectively connected to the two air storage chambers 3. A first solenoid valve is installed inside the high-pressure nozzles 4. A pressurization component is provided on the side of the air storage chamber 3 away from the center of the regulating housing 1. Specifically, conventional logging instrument centering support devices suffer from defects such as severe wear, small diameter range, unstable diameter force, and easy jamming. However, in the embodiment of this invention, multiple adjusting housings 1 are first concentrically installed on the logging instrument, thereby ensuring that the central axis of the multiple adjusting housings 1 is consistent with the central axis of the logging instrument, which facilitates subsequent adjustment operations. It is understood that this invention also includes a data processing system, which receives data transmitted by the ultrasonic transducer 2 and analyzes the data to determine if there is a deviation between the center of the logging instrument and the center of the well. If a deviation exists, a command is sent to the thrust actuator to drive it to adjust the position of the logging instrument. In practical use, the installed support device and logging instruments are placed into the well. When the measurement begins, the ultrasonic transducer 2 is turned on to emit ultrasonic waves towards the well wall and retrieve the waves, as shown in the attached diagram. Figure 1As shown, taking six adjusting housings 1 as an example, six sets of data can be obtained. When the center of the logging instrument and the center of the well are on the same central axis, there are different values ​​in the six sets of data. At this time, the specific deviation value of the logging instrument can be obtained through the six sets of data, and then the required thrust can be calculated. Then, a command is sent to the thrust actuator to generate thrust to push the logging instrument to adjust its position. Specifically, before use, a sufficient amount of high-pressure nitrogen needs to be filled into the gas storage chamber 3. The specific amount of nitrogen to be used needs to be calculated based on actual data such as well depth and logging instrument quality. When the thrust actuator receives the command, the pressurization component first operates to pressurize the inside of the gas storage chamber 3. At the same time, the first solenoid valve inside the high-pressure nozzle 4 opens, causing the nitrogen inside the gas storage chamber 3 to be ejected. The ejected high-speed nitrogen will exert a reverse thrust on the regulating housing 1. Under the action of this thrust, the regulating housing 1 can be pushed to move the logging instrument to adjust its position. In actual use, six sets of thrust actuators can be controlled to eject nitrogen at the same amount and speed to ensure the stability during the lifting process. In this embodiment of the invention, the ultrasonic transducer 2 can sense the wellbore morphology in real time, and actively adjust the attitude in conjunction with the thrust actuator. Compared with the passive adjustment of the traditional support structure, the centering adjustment is more intelligent and sensitive. At the same time, this embodiment of the invention uses a thrust actuator to adjust the position of the logging instrument by thrust, so that it does not need to contact the well wall, and thus avoids the wear and jamming in the conventional sense. In addition, when the well diameter changes, the thrust can be adjusted by the thrust actuator to adapt to wells of different sizes, so the adaptability is better.

[0023] like Figures 2 to 7 As shown, the pressurization assembly includes a pressurization plug 5 slidably connected inside the gas storage chamber 3. A servo assembly 6 is threadedly connected to the side of the pressurization plug 5 away from the gas storage chamber 3. The servo assembly 6 is used to drive the pressurization plug 5 to slide back and forth. Specifically, the servo component 6 includes a servo motor, encoder, coupling, and rotating screw, which are existing technologies and will not be described in detail here. After the thrust actuator receives the command, the command is sent to the encoder of the servo motor, thereby executing the command to make the servo motor start rotating at a constant speed, which in turn drives the rotating screw to rotate. The rotating screw is connected to the pressure plug 5 by a thread. During the rotation of the rotating screw, the pressure plug 5 will move up and down at a constant speed inside the gas storage chamber 3, thereby changing the pressure inside the gas storage chamber 3, thereby squeezing the nitrogen inside the gas storage chamber 3 and ejecting the nitrogen at a constant speed, achieving the effect of applying thrust to the logging instrument.

[0024] like Figures 2 to 7As shown, the regulating housing 1 has a spare gas chamber on both sides of the gas storage chamber 3. The regulating housing 1 has a connecting hole 8, which is used to connect the gas storage chamber 3 and the spare gas chamber. A second solenoid valve is installed inside the connecting hole 8. A spare gas cylinder 7 is installed outside the gas storage chamber 3 at the corresponding position of the spare gas chamber. Specifically, considering the limited space inside the gas storage chamber 3, the device is easily limited by its own storage space when encountering some ultra-long deep wells, resulting in poor performance. To address this, this embodiment of the invention sets up multiple backup gas cylinders 7. High-pressure nitrogen is injected into the multiple backup gas cylinders 7 in advance as a backup. When the amount of nitrogen inside the gas storage chamber 3 is insufficient, the lifting action of the logging instrument is paused. Then, the second solenoid valve inside the connecting hole 8 is opened, allowing the backup gas cylinders 7 to connect with the gas storage chamber 3 through the backup gas chamber. Then, the servo component 6 reverses its operation, driving the pressure plug 5 to move upward, drawing nitrogen from the backup gas cylinders 7 to replenish the gas. This allows the device to adapt to deep well operations of various lengths, improving the applicability of the equipment.

[0025] like Figures 1 to 3 As shown, clamping rings 9 are fixedly connected to the outside of the multiple spare gas cylinders 7 on the upper and lower sides respectively, and limiting seats 10 are fixedly connected to the side of the multiple spare gas cylinders 7 on the upper and lower sides away from the adjusting housing 1 respectively. Specifically, the clamping ring 9 and the limiting seat 10 can effectively limit the backup gas cylinder 7, ensuring stability during the hoisting process. At the same time, the underground environment is complex, and the clamping ring 9 can protect the backup gas cylinder 7 to a certain extent to avoid damage and leakage.

[0026] like Figures 1 to 2 As shown, the limiting seat 10 has a chamfer on the side away from the adjusting housing 1, and the limiting seat 10 has multiple limiting bolts 11 connected inside by threads; Specifically, some wells may contain water and gravel. During the lifting and lowering of the logging instrument, the chamfer of the limit seat 10 can effectively break through the water and gravel, thereby protecting the spare gas cylinder 7 and the regulating housing 1 and improving the service life of the equipment. During the installation of the device, the limit seat 10 and the logging instrument can be effectively fixed by the limiting bolt 11.

[0027] like Figures 4 to 7 As shown, a first pressure sensor 12 is installed on the outside of the regulating housing 1, and a second pressure sensor 13 is installed inside the air storage chamber 3. An internal pressure regulating mechanism is installed on the side of the second pressure sensor 13 near the center of the regulating housing 1. Specifically, for some ultra-long wells, the pressure at the bottom is often relatively high. In order to avoid a large pressure difference between the inside of the gas storage chamber 3 and the outside, which would reduce the thrust effect of nitrogen injection, a first pressure sensor 12 and a second pressure sensor 13 are designed. The first pressure sensor 12 detects the pressure data inside the well, and the second pressure sensor 13 detects the pressure data inside the gas storage chamber 3. These two sets of pressure data are transmitted to the data processing system in real time. Based on these two sets of data, the data processing system sends instructions to the internal pressure adjustment mechanism to dynamically adjust the pressure inside the gas storage chamber 3, so that the pressure difference between the inside and outside of the gas storage chamber 3 is maintained within 3 MPa.

[0028] like Figures 4 to 7 As shown, the internal pressure adjustment mechanism includes a magnetic piston 14 fixedly connected to the second pressure sensor 13. The magnetic piston 14 is slidably connected to the gas storage chamber 3, and the magnetic piston 14 is located on the side of the high-pressure nozzle 4 near the center of the adjustment housing 1. A transmission rod 15 is fixedly connected to the side of the magnetic piston 14 away from the pressure plug 5. An electromagnet 16 is slidably connected to the side of the transmission rod 15 away from the magnetic piston 14. The pressure plug 5 is in the shape of an "I". Specifically, when it is necessary to adjust the pressure inside the gas storage chamber 3, the data processing system sends a command to the power supply unit of the electromagnet 16, causing the electromagnet 16 to be energized and generate magnetism. The magnitude of the magnetism of the electromagnet 16 is adjusted by the voltage. At this time, the electromagnet 16 will apply magnetic force to the magnetic piston 14. Under the action of the magnetic force, the magnetic piston 14 will slide along the transmission rod 15 inside the gas storage chamber 3, thereby changing the size of the internal space of the gas storage chamber 3, and thus actively compressing the nitrogen inside the gas storage chamber 3 to adjust the pressure inside the gas storage chamber 3. The pressure plug 5 is set in an "I" shape so that the pressure plug 5 supports the gas storage chamber 3 during the sliding process, so as to prevent the gas storage chamber 3 from collapsing under high pressure.

[0029] like Figures 1 to 9 As shown, multiple rotating seats 17 are fixedly connected to the outside of the two clamping rings 9. A support rod 18 is rotatably connected to the middle of each of the multiple rotating seats 17. The support rods 18 are hinged to each other and a friction wheel 19 is rotatably connected to each other. Specifically, considering the complex downhole environment, when a pressurizing component fails, it may be difficult to achieve the centering adjustment function. At this time, the support rod 18 and the friction wheel 19 will play a role. The ends of the two support rods 18 that are far apart will move closer to each other, thereby lifting the friction wheel 19. The mechanical centering effect is achieved by setting multiple friction wheels 19, thereby increasing the fault safety guarantee for the device.

[0030] like Figures 1 to 9As shown, the servo component 6 is covered with a protective shell 24. One end of the protective shell 24 is fixedly connected to the clamping ring 9, and the other end of the protective shell 24 is fixedly connected to the adjusting shell 1 with an elastic sleeve 23. Multiple permanent magnets 25 are fixedly connected inside the clamping ring 9. Specifically, when installing the adjusting housing 1, a magnetic block adapted to the permanent magnet 25 needs to be installed inside it at the position corresponding to the permanent magnet 25. In the initial state, the permanent magnet 25 is magnetic, and the elastic sleeve 23 is in a stretched state. The magnetic force of the permanent magnet 25 and the magnetic block limits the clamping ring 9. When mechanical positioning is required, the permanent magnet 25 is energized to reduce its magnetism. At this time, the elastic sleeve 23 will pull the two clamping rings 9 closer to each other, thereby pushing the support rod 18 to move and achieving the effect of mechanical positioning. At the same time, the design of the protective housing 24 and the elastic sleeve 23 can effectively protect the internal air storage chamber 3, pressurizing plug 5, and servo component 6.

[0031] like Figures 8 to 9 As shown, a limiting shaft 20 is fixedly connected to the side of the support rod 18 near the adjusting housing 1. A flow-blocking fan blade 21 is rotatably connected to the outside of the limiting shaft 20. A scraping strip 22 is fixedly connected to the side of the flow-blocking fan blade 21 near the adjusting housing 1. Specifically, during well logging, the water in the well exerts a force on the flow-restricting fan blade 21. Under this force, the flow-restricting fan blade 21 rotates around the limiting shaft 20, thereby driving the scraper strip 22 to rotate. The rotation of the scraper strip 22 scrapes the surfaces of the ultrasonic transducer 2 and the high-pressure nozzle 4, removing dirt from their surfaces and ensuring the detection quality of the ultrasonic transducer 2 and the thrust effect of the high-pressure nozzle 4. It can be understood that an electromagnetic mechanism is provided between the limiting shaft 20 and the flow-restricting fan blade 21. The electromagnetic mechanism is intermittently activated so that the flow-restricting fan blade 21 can rotate around the limiting shaft 20, thereby avoiding the continuous rotation of the flow-restricting fan blade 21 from affecting the ultrasonic transducer 2 and the high-pressure nozzle 4. Furthermore, the electromagnetic mechanism can be a pin installed inside the limiting shaft 20 and telescopically controlled by electromagnetic control, and a locking hole opened inside the flow-restricting fan blade 21 that matches the pin. The extension and retraction of the pin limits the flow-restricting fan blade 21.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centering support device for logging instruments in downhole high-temperature and high-pressure environments, characterized in that: The system includes multiple adjustable housings (1) arranged in a circular array. The multiple adjustable housings (1) are installed concentrically with the logging instrument. Each of the multiple adjustable housings (1) is fixedly connected to an ultrasonic transducer (2). The ultrasonic transducer (2) is used to emit ultrasonic waves to the well wall and recover the waves. A thrust actuator is installed inside the adjustable housing (1). The thrust actuator applies thrust to push the logging instrument to the center of the well. The thrust actuator includes air storage chambers (3) located on the upper and lower sides inside the regulating housing (1). A pair of high-pressure nozzles (4) are fixed inside the regulating housing (1) and at one end of the air storage chamber (3) near the ultrasonic transducer (2). The pair of high-pressure nozzles (4) are respectively connected to the two air storage chambers (3). A first solenoid valve is installed inside the high-pressure nozzles (4). A pressurization component is provided on the side of the air storage chamber (3) away from the center of the regulating housing (1). The pressurization assembly includes a pressurization plug (5) slidably connected inside the gas storage chamber (3). A servo assembly (6) is threadedly connected to the side of the pressurization plug (5) away from the gas storage chamber (3). The servo assembly (6) is used to drive the pressurization plug (5) to slide back and forth.

2. The centering support device for logging instruments in a downhole high-temperature and high-pressure environment according to claim 1, characterized in that: The regulating housing (1) has a spare air chamber on both sides of the air storage chamber (3). The regulating housing (1) has a connecting hole (8) to connect the air storage chamber (3) and the spare air chamber. A second solenoid valve is installed inside the connecting hole (8). A spare air cylinder (7) is installed outside the air storage chamber (3) at the corresponding position of the spare air chamber.

3. The centering support device for logging instruments under high temperature and high pressure conditions in downhole environments according to claim 2, characterized in that: The multiple spare gas cylinders (7) on the upper and lower sides are respectively fixedly connected to clamping rings (9), and the multiple spare gas cylinders (7) on the upper and lower sides away from the adjusting housing (1) are respectively fixedly connected to limiting seats (10).

4. The centering support device for logging instruments under high temperature and high pressure environment in downhole drilling according to claim 3, characterized in that: The limiting seat (10) has a chamfer on the side away from the adjusting housing (1), and the interior of the limiting seat (10) is connected by multiple limiting bolts (11) by threads.

5. A centering support device for logging instruments in a downhole high-temperature and high-pressure environment according to claim 2, characterized in that: A first pressure sensor (12) is installed on the outside of the regulating housing (1), and a second pressure sensor (13) is installed inside the gas storage chamber (3). An internal pressure regulating mechanism is installed on the side of the second pressure sensor (13) near the center of the regulating housing (1).

6. The centering support device for logging instruments under high temperature and high pressure conditions in downhole drilling according to claim 5, characterized in that: The internal pressure adjustment mechanism includes a magnetic piston (14) fixedly connected to the second pressure sensor (13). The magnetic piston (14) is slidably connected to the gas storage chamber (3), and the magnetic piston (14) is located on the side of the high-pressure nozzle (4) near the center of the adjustment housing (1). A transmission rod (15) is fixedly connected to the side of the magnetic piston (14) away from the pressure plug (5). An electromagnet (16) is slidably connected to the side of the transmission rod (15) away from the magnetic piston (14). The pressure plug (5) is in the shape of an "I".

7. A centering support device for logging instruments in a downhole high-temperature and high-pressure environment according to claim 3, characterized in that: Multiple rotating seats (17) are fixedly connected to the outside of the two clamping rings (9). A support rod (18) is rotatably connected to the middle of each of the multiple rotating seats (17). The support rods (18) are hinged to each other and a friction wheel (19) is rotatably connected to each other.

8. The centering support device for logging instruments under high temperature and high pressure conditions in downhole wells according to claim 7, characterized in that: The servo component (6) is covered with a protective shell (24). One end of the protective shell (24) is fixedly connected to the clamping ring (9), and the other end of the protective shell (24) is fixedly connected to the adjusting shell (1) with an elastic sleeve (23). Multiple permanent magnets (25) are fixedly connected inside the clamping ring (9).

9. A centering support device for logging instruments in a downhole high-temperature and high-pressure environment according to claim 7, characterized in that: The support rod (18) is fixedly connected to a limiting shaft (20) on the side near the adjusting housing (1). The limiting shaft (20) is rotatably connected to a flow-blocking fan blade (21). The flow-blocking fan blade (21) is fixedly connected to a scraping strip (22) on the side near the adjusting housing (1).

Images