Intelligent control plunger for drainage gas recovery
By using a wedge-shaped retaining ring design and intelligently controlled plunger, the problems of slow downward speed and poor adaptability of traditional plungers in low-pressure gas wells have been solved, achieving rapid downward movement and sealing, and improving drainage and gas production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHAANXI YANCHANG PETROLEUM GRP
- Filing Date
- 2025-12-16
- Publication Date
- 2026-05-01
AI Technical Summary
Traditional plungers cannot automatically adjust their position according to well conditions in low-pressure gas well production. They have a slow descent speed and poor adaptability, resulting in low drainage and gas production efficiency.
The design employs a wedge-shaped retaining ring, combined with a drive mechanism and sensor module, to achieve intelligent control of the sealing component. Rapid descent and sealing are achieved through the retraction and expansion of the rubber sealing ring, and intelligent control is achieved using wireless charging and sensor modules.
It enables rapid descent and sealing of the plunger under different well conditions, reduces liquid loss, improves drainage and gas production efficiency, eliminates the need for downhole locking devices, and enhances gas well production capacity.
Smart Images
Figure CN121952844A_ABST
Abstract
Description
A smart control plunger for drainage gas extraction Technical Field
[0001] This invention relates to the field of oil and gas field gas production technology, and in particular to an intelligent control plunger for drainage gas production. Background Technology
[0002] In natural gas well production, the production period can be divided into two stages based on the water production status: the waterless production period and the water-producing production period. The main reasons for well fluid accumulation are the inflow of liquid water into the wellbore and the condensation of liquid from organic matter produced along with the natural gas. Initially, well water production does not affect production because the amount of fluid is small, and the bottom-hole pressure is high enough in the early stages of production to allow the gas velocity in the wellbore to be directly sprayed to the wellhead, carrying the liquid with it. In the later stages of production, as well water production increases, the fluid accumulation in the wellbore changes from a unidirectional flow to a two-phase flow of gas and water. At this point, the density and pressure drop gradient of the fluid in the wellbore increase. The pressure of the natural gas at the bottom of the well is insufficient to carry the water and condensate to the surface. As production continues, the formation water and condensate gradually fall back to the bottom of the well and accumulate, leading to a decrease in well production or even shutdown.
[0003] Therefore, fluid accumulation in gas wells is a problem that must be solved during natural gas extraction. Currently, to promptly remove fluid from the bottom of gas wells, there are several types of drainage and gas production technologies. These can be categorized into three main types based on their drainage principles: critical flow drainage, gas lift drainage, and mechanical drainage. Plunger drainage and gas production technology is one of the most economical and effective technologies, widely used both domestically and internationally, and its development is relatively mature. Plunger drainage and gas production technology utilizes the gas well's own energy and high pressure at the bottom of the well to push a plunger to the wellhead, thereby removing the fluid accumulated at the bottom of the well. The plunger can be viewed as a piston inside the tubing. During drainage and gas production, the plunger acts as a solid interface between the high-pressure gas at the bottom of the well and the fluid accumulated in the tubing, preventing leakage of the discharged liquid and improving drainage and gas production efficiency.
[0004] Currently, low-pressure gas well production places new demands on the efficiency and intelligence of plunger drainage gas production technology. Traditional plunger drainage gas production requires a locking device to be installed at the bottom of the well beforehand. The plunger cannot automatically adjust its descent position according to well conditions. Furthermore, traditional plungers have slow descent speeds, poor adaptability, and require waiting for the wellhead controller to send an upward signal at the bottom of the well, resulting in low efficiency. In recent years, drainage gas production technology has continuously advanced, and its application scope has expanded, with ongoing updates and innovations in technology and equipment. To further promote the advancement of drainage gas production technology and meet the new application requirements of drainage gas production plungers, it is essential to design an intelligent plunger for drainage gas production. Summary of the Invention
[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide an intelligent control plunger for drainage and gas extraction, which has the advantages of being easy to use and having a simple and reliable structure.
[0006] The technical solution of this invention is as follows: an intelligent control plunger for drainage and gas production, comprising: a tubular plunger body; at least one set of sealing components; the sealing components consist of a stationary wedge-shaped retaining ring and a moving wedge-shaped retaining ring, the stationary wedge-shaped retaining ring being axially fixed relative to the plunger body, the moving wedge-shaped retaining ring being slidably disposed on the outer wall of the plunger body, and the mating surfaces of the stationary wedge-shaped retaining ring and the moving wedge-shaped retaining ring being mutually cooperating conical inclined surfaces, and a rubber sealing ring being fixed on the circumferential surface of the moving wedge-shaped retaining ring; a driving mechanism, disposed within the plunger body, the output end of which acts on the moving wedge-shaped retaining ring, causing the moving wedge-shaped retaining ring to axially separate from or axially press against the stationary wedge-shaped retaining ring, the rubber sealing ring retracting or radially expanding under the action of the conical inclined surface to contact and seal with the tubing wall; when the rubber sealing ring retracts, the plunger body rapidly descends under its own weight; when the rubber sealing ring radially expands and contacts and seals with the tubing wall, the formation gas accumulates and pressurizes below the plunger body, and the plunger body lifts the accumulated liquid above the plunger body to the wellhead, completing the drainage.
[0007] The plunger body includes a retrieval head, a first connecting rod, a battery short tube, a central connecting slide rod, a motor short tube, and a probe cap connected in series. The central connecting slide rod has at least one stationary wedge-shaped retaining ring rigidly fixed to its outer wall, and a sliding connecting ring is slidably fitted onto it. A moving wedge-shaped retaining ring is fixedly mounted on the outer wall of the sliding connecting ring. The upper end of the motor short tube has a sliding groove, on which a second driving slip ring is slidably mounted. The lower end has a second adjusting thread, which is threadedly connected to a second sliding fixed ring. A drive motor and a motor drive plate are sequentially arranged inside the motor short tube. The output shaft of the drive motor is connected to a screw, which also has a nut that moves axially in conjunction with it. The second driving slip ring is rigidly fixed to the nut. The second driving slip ring is also connected to the moving wedge-shaped retaining ring. The probe cap is fixedly connected to the tail end of the motor short tube, and a sensor module is located inside the probe cap. The sensor module is electrically connected to the drive motor. The drive motor drives the screw, nut, and second driving slip ring sequentially according to the signal from the sensor module, thereby driving the moving wedge-shaped retaining ring to axially separate from or axially press against the stationary wedge-shaped retaining ring.
[0008] The upper end of the battery short tube is sleeved on the end of the first connecting rod through the first driving slip ring, and the lower end is provided with the first adjusting thread. The first adjusting thread is connected to the first sliding fixing ring through the thread. The battery short tube is provided with a storage battery and a battery control circuit board. The outer wall of the battery short tube corresponding to the storage battery is wound with a charging induction coil. The first driving slip ring, the moving wedge retaining ring and the second driving slip ring are connected by the second connecting rod.
[0009] A first set of straightening springs is provided between the first drive slip ring and the first sliding fixed ring. The first set of straightening springs consists of 4 first straightening springs, which are evenly distributed around the outside of the battery short tube. A second set of straightening springs is provided between the second drive slip ring and the second sliding fixed ring. The second set of straightening springs consists of 4 second straightening springs, which are evenly distributed around the outside of the motor short tube.
[0010] The first straightening spring is connected to the first driving slip ring and the first sliding fixed ring through a slot, and the second straightening spring is also connected to the second driving slip ring and the second sliding fixed ring through a slot.
[0011] The second drive slip ring is a cross connecting rod, which is clearance-fitted with the slide groove and fixedly connected to the nut.
[0012] The motor short tube is equipped with a partition, which forms a sealed space inside the motor short tube. The drive motor is located in the sealed space, and the output shaft of the drive motor passes through the sealed space and is connected to the screw.
[0013] The sealing assembly consists of two sets, including a first sliding connecting ring, a first stationary wedge-shaped retaining ring, a second sliding connecting ring, and a second stationary wedge-shaped retaining ring sequentially arranged on a central connecting slide rod. The first and second stationary wedge-shaped retaining rings are fixedly mounted on the central connecting slide rod. A first movable wedge-shaped retaining ring slides on the first sliding connecting ring, and a second movable wedge-shaped retaining ring slides on the second sliding connecting ring. When the first movable wedge-shaped retaining ring and the first stationary wedge-shaped retaining ring are axially pressed together, a first sealing ring is formed. When the second movable wedge-shaped retaining ring and the second stationary wedge-shaped retaining ring are axially pressed together, a second sealing ring is formed.
[0014] Bearings and sealing rings are provided at the joints between the screw and the partition, and between the partition and the central connecting slide.
[0015] The outer wall of the rubber sealing ring is provided with annular patterns.
[0016] The technical advantages of this invention are as follows: This invention uses wedge-shaped retaining rings to achieve the opening and closing function of the waterway, seals the pipe with multiple wedge-shaped retaining rings, utilizes a charging coil for wireless charging, and employs a sensor module for intelligent control. It has the following advantages: 1. In this invention, the sealing assembly separates axially during the plunger's descent, enabling rapid descent compared to traditional plungers; 2. Compared to traditional plunger-based drainage and gas production, this invention allows setting the water lift depth value according to different well conditions. The sealing assembly remains sealed at the corresponding depth of water entry in the well, allowing for suspension at any position without the need for a downhole locking device, thus improving the efficiency of gas well drainage and gas production; 3. This invention uses multiple sealing ring components as the sealing method. The rubber rings expand and adhere tightly to the tubing wall under downhole pressure, achieving a contact seal, reducing liquid leakage, and improving drainage efficiency. Attached Figure Description
[0017] Figure 1 is a schematic diagram of the overall structure of the present invention.
[0018] Figure 2 is a partial structural diagram of the battery short tube.
[0019] Figure 3 is a partial cross-sectional view of the battery short tube.
[0020] Figure 4 is a schematic diagram of the two sets of sealing components in the axially separated state.
[0021] Figure 5 is a schematic diagram of the two sets of sealing components under axial compression.
[0022] Figure 6 is a partial structural diagram of the motor short tube.
[0023] Figure 7 is a partial cross-sectional view of the motor short tube.
[0024] Figure 8 is a schematic diagram of the assembly of the nut and screw.
[0025] Reference numerals: 1. Retrieval head; 2. First connecting rod; 3. First drive slip ring; 4. Charging induction coil; 5. First straightening spring group; 6. First adjusting thread; 7. First sliding connecting ring; 8. First moving wedge retaining ring; 9. First stationary wedge retaining ring; 10. Second connecting rod; 11. Middle connecting slide rod; 12. Second sliding connecting ring; 13. Second moving wedge retaining ring; 14. Second stationary wedge retaining ring; 15. Second drive slip ring; 16. Second straightening spring group; 17. Motor short tube; 18. Second adjusting thread; 19. Second sliding fixing ring; 20. Probe cap; 21. First sliding fixing ring; 22. Battery short tube; 23. Battery; 24. Battery control circuit board; 25. Slide groove; 26. Nut; 27. Screw; 28. Drive motor; 29. Partition plate; 30. Motor drive board; 31. Sensor module. Detailed Implementation
[0026] Example 1: An intelligent control plunger for drainage and gas production includes: a tubular plunger body; at least one sealing assembly; the sealing assembly consists of a stationary wedge-shaped retaining ring and a moving wedge-shaped retaining ring, the stationary wedge-shaped retaining ring being axially fixed relative to the plunger body, the moving wedge-shaped retaining ring being slidably disposed on the outer wall of the plunger body, and the mating surfaces of the stationary wedge-shaped retaining ring and the moving wedge-shaped retaining ring being mutually cooperating conical inclined surfaces, and a rubber sealing ring being fixed on the circumferential surface of the moving wedge-shaped retaining ring; a driving mechanism, disposed within the plunger body, the output end of which acts on the moving wedge-shaped retaining ring, causing the moving wedge-shaped retaining ring to axially separate from or axially press against the stationary wedge-shaped retaining ring, the rubber sealing ring retracting or radially expanding under the action of the conical inclined surface to contact and seal with the tubing wall; when the rubber sealing ring retracts, the plunger body rapidly descends under its own weight; when the rubber sealing ring radially expands and contacts and seals with the tubing wall, the formation gas accumulates and pressurizes below the plunger body, and the plunger body lifts the accumulated liquid above the plunger body to the wellhead, completing the drainage.
[0027] Example 2, based on Example 1, further includes: the plunger body comprises a retrieval head 1, a first connecting rod 2, a battery short tube 22, a central connecting slide rod 11, a motor short tube 17, and a probe cap 20 connected in series; the central connecting slide rod 11 has at least one stationary wedge-shaped retaining ring rigidly fixed to its outer wall, and a sliding connecting ring is slidably fitted thereon, with a moving wedge-shaped retaining ring fixed to its outer wall; the upper end of the motor short tube 17 has a sliding groove 25, on which a second driving slip ring 15 is slidably mounted, and the lower end has a second adjusting thread 18, which is threadedly connected to a second sliding fixing ring 19; the motor short tube 17 is provided with... The device includes a drive motor 28 and a motor drive board 30. The output shaft of the drive motor 28 is connected to a screw 27, and the screw 27 is also provided with a nut 26 that moves axially in cooperation with it. A second drive slip ring 15 is rigidly fixed to the nut 26. The second drive slip ring 15 is also connected to a moving wedge retaining ring. The probe cap 20 is fixedly connected to the tail end of the motor short tube 17. A sensor module 31 is provided inside the probe cap 20. The sensor module 31 is electrically connected to the drive motor 28. The drive motor 28 drives the screw 27, the nut 26 and the second drive slip ring 15 in sequence according to the signal from the sensor module 31, thereby driving the moving wedge retaining ring to axially separate or axially press against the stationary wedge retaining ring.
[0028] Based on Example 2, Example 3 further includes: the upper end of the battery short tube 22 is sleeved on the end of the first connecting rod 2 through the first driving slip ring 3, and the lower end is provided with the first adjusting thread 6, which is threadedly connected to the first sliding fixing ring 21; the battery short tube 22 is provided with a storage battery 23 and a battery control circuit board 24 inside, and the outer wall of the battery short tube 22 corresponding to the storage battery 23 is wound with a charging induction coil 4; the first driving slip ring 3, the moving wedge retaining ring and the second driving slip ring 15 are connected by the second connecting rod 10.
[0029] Based on Example 3, Example 4 further includes: a first straightening spring group 5 is provided between the first driving slip ring 3 and the first sliding fixed ring 21, the first straightening spring group 5 is composed of 4 first straightening springs, which are evenly distributed around the outside of the battery short tube 22; a second straightening spring group 16 is provided between the second driving slip ring 15 and the second sliding fixed ring 19; the second straightening spring group 16 is composed of 4 second straightening springs, which are evenly distributed around the outside of the motor short tube 17.
[0030] The first straightening spring is connected to the first driving slip ring 3 and the first sliding fixed ring 21 through a slot, and the second straightening spring is also connected to the second driving slip ring 15 and the second sliding fixed ring 19 through a slot.
[0031] Example 5, based on Example 4, further includes: the sealing assembly consists of two sets, including a first sliding connecting ring 7, a first stationary wedge-shaped retaining ring 9, a second sliding connecting ring 12, and a second stationary wedge-shaped retaining ring 14 sequentially arranged on the central connecting slide rod 11; wherein, the first stationary wedge-shaped retaining ring 9 and the second stationary wedge-shaped retaining ring 14 are fixedly arranged on the central connecting slide rod 11, a first moving wedge-shaped retaining ring 8 is slidably arranged on the first sliding connecting ring 7, and a second moving wedge-shaped retaining ring 13 is slidably arranged on the second sliding connecting ring 12; when the first moving wedge-shaped retaining ring 8 and the first stationary wedge-shaped retaining ring 9 are axially pressed together, a first sealing ring is formed, and when the second moving wedge-shaped retaining ring 13 and the second stationary wedge-shaped retaining ring 14 are axially pressed together, a second sealing ring is formed.
[0032] Example 6, based on Example 5, further includes: the second drive slip ring 15 is a cross-shaped connecting rod, which is clearance-fitted with the slide groove 25 and fixedly connected to the nut 26. A partition 29 is provided inside the motor short tube 17, forming a sealed space inside the motor short tube 17. The drive motor 28 is located within this sealed space, and the output shaft of the drive motor 28 extends out of the sealed space and connects to the screw 27. Bearings and sealing rings are provided at the mating points between the screw 27 and the partition 29, and between the partition 29 and the central connecting slide rod 11. The outer wall of the rubber sealing ring has annular patterns.
[0033] Specific Application Case: Working Principle of this Invention: Plunger gas lift is a special form of intermittent gas lift, whose energy mainly comes from formation gas. This invention uses the plunger body as a solid interface, separating the liquid above the plunger body from the gas below in the wellbore, thus achieving a sealing effect to minimize liquid loss and prevent gas cross-flow, thereby achieving the purpose of drainage and gas production. The plunger body is a piston with a diameter slightly smaller than the tubing diameter, which can move up and down inside the tubing. Typically, the entire plunger gas lift process is divided into two stages: the plunger descending stage and the plunger ascending liquid discharge stage.
[0034] During the plunger descent phase: First, the output shaft of the drive motor 28 rotates to sequentially control the screw 27 and nut 26. Nut 26 drives the second drive slip ring 15 to move upward along the slide groove 25, thereby causing the first moving wedge retaining ring 8 to axially separate from the first stationary wedge retaining ring 9. At the same time, the second moving wedge retaining ring 13 and the second stationary wedge retaining ring 14 axially separate, allowing the liquid in the lower part of the plunger body to pass through the gap quickly. Simultaneously, the second drive slip ring 15 and the first drive slip ring 3 move upward, pulling the second centralizing spring group 16 and the first centralizing spring group 5, reducing the deformation of the second centralizing spring / second centralizing spring, and reducing the friction between the second centralizing spring group 16 and the first centralizing spring group 5 and the pipeline. Under its own weight, the plunger body begins to fall from the wellhead, and the wellhead casing pressure and wellhead oil pressure begin to gradually recover. When the plunger body passes through the gas and liquid and finally descends to the appropriate position, the pressure threshold is set according to the set water lifting depth. The sensor module 31 controls the drive motor 28 to rotate in the opposite direction to form the first sealing ring and the second sealing ring. At the same time, the second drive slip ring 15 and the first drive slip ring 3 move down, pushing the second straightening spring group 16 and the first straightening spring group 5 to make the second straightening spring group 16 and the first straightening spring group 5 fully contact the pipeline and straighten the entire plunger body.
[0035] The plunger's upward flow and fluid discharge stage: When the wellhead casing pressure and wellhead oil pressure recover to a certain level, the first and second sealing rings are in a sealed state. When the well is started for production, the gas in the annulus expands and flows into the tubing, lifting the plunger body and the accumulated fluid above it towards the wellhead along with the formation gas. During this stage, the wellhead casing pressure and wellhead oil pressure continuously decrease, and the plunger body and the accumulated fluid above it reach the wellhead, at which point the gas well immediately begins fluid discharge production. When the plunger body passes the wellhead catcher, it is caught by the retrieval head 1, and the accumulated fluid completely enters the production pipeline, allowing production to continue.
[0036] As the plunger body reaches the wellhead, the battery 23 wirelessly charges via the charging induction coil 4. The plunger body transmits the collected downhole signals to a computer on the surface using the sensor module 31, which then reads the relevant downhole data. At this time, the formation water and fluid accumulated in the annulus re-accumulate at the bottom of the tubing. As the fluid accumulation at the bottom of the well increases, the bottomhole flowing pressure continuously rises. After the follow-through production phase ends, the well is shut in, and the above operations continue, causing the plunger body to fall under gravity, thus achieving continuous production operations.
Claims
1. A smart control plunger for drainage gas extraction, characterized in that, include: A tubular plunger body; at least one sealing assembly; the sealing assembly consists of a stationary wedge-shaped retaining ring and a movable wedge-shaped retaining ring, the stationary wedge-shaped retaining ring being axially fixed relative to the plunger body, the movable wedge-shaped retaining ring being slidably disposed on the outer wall of the plunger body, and the mating surfaces of the stationary wedge-shaped retaining ring and the movable wedge-shaped retaining ring being mutually mating conical inclined surfaces, a rubber sealing ring being fixed on the circumferential surface of the movable wedge-shaped retaining ring; a driving mechanism, disposed within the plunger body, the output end of which acts on the movable wedge-shaped retaining ring, causing the movable wedge-shaped retaining ring to axially separate from or axially press against the stationary wedge-shaped retaining ring, the rubber sealing ring retracting or radially expanding under the action of the conical inclined surface to contact and seal with the tubing wall; when the rubber sealing ring retracts, the plunger body rapidly descends under its own weight; when the rubber sealing ring radially expands and contacts and seals with the tubing wall, formation gas accumulates and pressurizes below the plunger body, the plunger body lifts the accumulated liquid above the plunger body to the wellhead, completing the drainage.
2. The intelligent control plunger for drainage gas extraction according to claim 1, characterized in that, The plunger body includes a retrieval head (1), a first connecting rod (2), a battery short tube (22), a middle connecting slide rod (11), a motor short tube (17), and a probe cap (20) connected in series. The middle connecting slide rod (11) has at least one static wedge-shaped retaining ring rigidly fixed on its outer wall, and a sliding connecting ring is slidably sleeved on it. The outer wall of the sliding connecting ring is fixedly equipped with a moving wedge-shaped retaining ring. The upper end of the motor short tube (17) is provided with a slide groove (25), and a second driving slide ring (15) is slidably arranged on the slide groove (25). The lower end is provided with a second adjusting thread (18), and the second adjusting thread (18) is connected to a second sliding fixing ring (19) by a thread. The motor short tube (17) is provided with a drive motor (28) and a motor drive in sequence. Plate (30); the output shaft of the drive motor (28) is connected to a screw (27), and the screw (27) is also provided with a nut (26) that moves axially with it. The second drive slip ring (15) is rigidly fixed to the nut (26). The second drive slip ring (15) is also connected to the moving wedge retaining ring. The probe cap (20) is fixedly connected to the tail end of the motor short tube (17). The probe cap (20) is provided with a sensor module (31). The sensor module (31) is electrically connected to the drive motor (28). The drive motor (28) drives the screw (27), nut (26) and second drive slip ring (15) in sequence according to the signal of the sensor module (31), thereby driving the moving wedge retaining ring to separate axially or press axially with the stationary wedge retaining ring.
3. The intelligent control plunger for drainage gas extraction according to claim 2, characterized in that, The upper end of the battery short tube (22) is sleeved on the end of the first connecting rod (2) through the first driving slip ring (3), and the lower end is provided with the first adjusting thread (6). The first adjusting thread (6) is connected to the first sliding fixing ring (21) through the thread. The battery short tube (22) is provided with a storage battery (23) and a battery control circuit board (24) inside. The outer wall of the battery short tube (22) corresponding to the storage battery (23) is wound with a charging induction coil (4). The first driving slip ring (3), the moving wedge retaining ring and the second driving slip ring (15) are connected by the second connecting rod (10).
4. The intelligent control plunger for drainage gas extraction according to claim 3, characterized in that, A first straightening spring group (5) is provided between the first drive slip ring (3) and the first sliding fixed ring (21). The first straightening spring group (5) consists of 4 first straightening springs, which are evenly distributed around the outside of the battery short tube (22). A second straightening spring group (16) is provided between the second drive slip ring (15) and the second sliding fixed ring (19). The second straightening spring group (16) consists of 4 second straightening springs, which are evenly distributed around the outside of the motor short tube (17).
5. The intelligent control plunger for drainage gas extraction according to claim 4, characterized in that, The first straightening spring is connected to the first driving slip ring (3) and the first sliding fixed ring (21) through a slot, and the second straightening spring (16) is also connected to the second driving slip ring (15) and the second sliding fixed ring (19) through a slot.
6. The intelligent control plunger for drainage gas extraction according to claim 2, characterized in that, The second drive slip ring (15) is a cross connecting rod, which is clearance-fitted with the slide groove (25) and fixedly connected to the nut (26).
7. The intelligent control plunger for drainage gas extraction according to claim 2, characterized in that, The motor short tube (17) is provided with a partition (29) to form a closed space inside the motor short tube (17). The drive motor (28) is located in the closed space, and the output shaft of the drive motor (28) passes through the closed space and is connected to the screw (27).
8. The intelligent control plunger for drainage gas extraction according to claim 2, characterized in that, The sealing assembly consists of two sets, including a first sliding connecting ring (7), a first stationary wedge-shaped retaining ring (9), a second sliding connecting ring (12), and a second stationary wedge-shaped retaining ring (14) sequentially arranged on the central connecting slide rod (11); wherein, the first stationary wedge-shaped retaining ring (9) and the second stationary wedge-shaped retaining ring (14) are fixedly arranged on the central connecting slide rod (11), the first sliding connecting ring (7) is slidably provided with a first moving wedge-shaped retaining ring (8), and the second sliding connecting ring (12) is slidably provided with a second moving wedge-shaped retaining ring (13); when the first moving wedge-shaped retaining ring (8) and the first stationary wedge-shaped retaining ring (9) are axially pressed together, a first sealing ring is formed, and when the second moving wedge-shaped retaining ring (13) and the second stationary wedge-shaped retaining ring (14) are axially pressed together, a second sealing ring is formed.
9. The intelligent control plunger for drainage gas extraction according to claim 7, characterized in that, Bearings and sealing rings are provided at the joints between the screw (27) and the partition (29), and between the partition (29) and the central connecting slide (11).
10. The intelligent control plunger for drainage gas extraction according to claim 1, characterized in that, The outer wall of the rubber sealing ring is provided with annular patterns.