An intelligent swab for downhole fluid evacuation

Abstract

The application discloses an intelligent sucker for downhole liquid discharge, and relates to the technical field of drainage gas production, comprising a swabbing mechanism, a rigid belt, a supporting cylinder and a mounting rod. The swabbing mechanism comprises a grabbing head, a plastic cylinder and a swabbing assembly. The plastic cylinder is installed outside the swabbing assembly, and the swabbing assembly is used for expanding or restoring the plastic cylinder. The plastic cylinder in the expanded state blocks the wellbore. The rigid belt is configured to be connected with a lifting device. An intelligent control mechanism is arranged in the mounting rod. The swabbing assembly comprises an external block matched with the size of a second communication groove. The external block is installed on a transmission rod and is used for blocking the second communication groove and a central flow channel. The application is suitable for swabbing and liquid discharge of low-pressure gas wells, has good use effect, is convenient to use, fills the blank of the intelligent sucker for the gas well swabbing process, can safely and efficiently discharge wellbore liquid, has simple and efficient construction, and solves the problems of production reduction or shutdown of the low-pressure gas well caused by the discharge of the liquid.

Description

Technical Field

[0001] This invention relates to the field of drainage and gas production technology, and in particular to an intelligent pump for downhole fluid drainage. Background Technology

[0002] As natural gas is extracted, the reservoir pressure decreases, and formation water gradually enters the wellbore, increasing in volume and thus reducing natural gas production. Because gas and water are immiscible, the formation water mixes with the gas in the formation as (gas-water clumps). Due to the reservoir pressure being able to overcome the resistance of the gas-liquid mixture flow, the gas-liquid mixture can enter the bottom of the well, but at this point the flow velocity has decreased, and a certain degree of liquid accumulation has occurred in the formation around the well.

[0003] As natural gas is further extracted, formation water production becomes increasingly severe, and natural gas production gradually decreases. The natural gas flow rate gradually decreases to the point where it is insufficient to carry formation water, leading to fluid accumulation at the bottom of the well or even flooding of the gas layer, ultimately resulting in reduced or stopped gas well production.

[0004] Existing drainage systems all use downhole pressure to pull the instruments out from bottom to top, mostly using plunger drainage or autogenous gas drainage methods. When a gas well is shut down, existing drainage and gas production technologies cannot effectively remove the accumulated fluid in the wellbore, making it impossible to resume gas well production. Summary of the Invention

[0005] To address the aforementioned issues, this application provides an intelligent pump for downhole fluid drainage.

[0006] This application provides a smart pump for downhole fluid drainage, including a pumping mechanism, a rigid band, a support cylinder, and an installation rod. The pumping mechanism includes a grab head, a plastic cylinder, and a pumping assembly. The top of the grab head is set as a connector, and a flow outlet is formed at the connector in the central flow channel of the pumping mechanism. The pumping assembly is connected to the bottom end of the grab head. The plastic cylinder is installed outside the pumping assembly and is used to expand or restore the plastic cylinder. In the expanded state, the plastic cylinder plugs the wellbore. The rigid band is fixedly connected to the connector and is configured to be connected to a lifting device so that the smart pump can be pulled up by the lifting device. The support cylinder abuts against the end of the plastic cylinder away from the grab head. Several openings are formed around the perimeter of the support cylinder. The first connecting groove is connected to the central flow channel. The mounting rod is connected to the end of the support cylinder away from the plastic cylinder. An intelligent control mechanism is installed inside the mounting rod. The intelligent control mechanism includes a transmission rod for realizing the action of the pumping component. The support cylinder has a second connecting groove, through which the transmission rod passes. The pumping component includes an external block adapted to the size of the second connecting groove. The external block is installed on the transmission rod and is used to seal the second connecting groove. Under the condition that the pumping component causes the plastic cylinder to expand and seal the wellbore, the external block seals the central flow channel. The intelligent control mechanism also includes a sensor for monitoring the pressure difference between the upper and lower spaces of the external block. When the pressure difference exceeds a preset value, the sealing of the central flow channel by the external block is released.

[0007] In some embodiments, the pumping assembly further includes:

[0008] The mounting sleeve has one end fixedly connected to the end of the grabbing head away from the connector, and the other end abuts against the end of the support cylinder. The plastic cylinder is installed on the outside of the mounting sleeve, and the plastic cylinder and the mounting sleeve form an annular groove.

[0009] Two connecting discs are installed in annular grooves. Each connecting disc has an annular cavity on its outer periphery, and an annular rod is installed in the annular cavity. The two connecting discs include a first connecting disc that is relatively close to the connector and a second connecting disc that is relatively far from the connector. A transmission rod passes through the second connecting disc. A limiting block is fixedly connected to one end of the transmission rod. The limiting block is located between the two connecting discs. When the transmission rod extends axially, the relative distance between the two connecting discs can be reduced. When the transmission rod retracts axially, the relative distance between the two connecting discs can be increased in conjunction with the limiting block.

[0010] Multiple sets of first and second movable rods are provided. In a single set of first and second movable rods, one end of the first movable rod is connected to the annular rod of the first connecting plate, one end of the second movable rod is connected to the annular rod of the second connecting plate, and the other end of the first movable rod is connected to the other end of the second movable rod through a rotating shaft. The multiple sets of first and second movable rods are arranged at intervals along the circumference of the connecting plate.

[0011] In some embodiments, a flexible element is sleeved on the transmission rod. The flexible element is located on the side of the second connecting plate away from the first connecting plate. One end of the flexible element is fixedly connected to the outer block. When the transmission rod extends axially, the flexible element abuts against the second connecting plate, pushing the second connecting plate closer to the first connecting plate.

[0012] In some embodiments, the connecting plate includes an inner plate, an outer plate, and at least one horizontal rod. The outer periphery of the inner plate is connected to the inner periphery of the outer plate. The horizontal rod is distributed radially along the inner plate, and both ends of the horizontal rod are fixedly connected to the inner periphery of the inner plate. The mounting sleeve has several square grooves distributed axially, and the horizontal rod passes through the square grooves. An annular cavity is formed at the outer periphery of the outer plate, and the outer plate has multiple axially distributed strip grooves at its outer periphery. The multiple strip grooves are evenly spaced along the circumference of the outer plate, and the strip grooves are used to install the first movable rod or the second movable rod.

[0013] In some implementations, the intelligent control mechanism further includes:

[0014] Electric assembly, with the drive rod mounted on the electric assembly;

[0015] Power supply, electrically connected to the electric components;

[0016] The control motherboard is electrically connected to the power supply and is also connected to the electric components.

[0017] The first pressure sensor is installed in the central flow channel of the grabbing head. The first pressure sensor is electrically connected to the power supply and the first pressure sensor is connected to the control motherboard.

[0018] The second pressure sensor is installed inside the mounting rod. The mounting rod has a hole in its body. One end of the hole is connected to the second pressure sensor, and the other end is connected to the outer edge of the mounting rod. The second pressure sensor is electrically connected to the power supply and the control main board. The pressure difference between the upper and lower spaces of the external block is obtained through the first and second pressure sensors.

[0019] In some embodiments, the intelligent control mechanism also includes a third pressure sensor and a temperature sensor located in a mounting slot within the mounting rod, both of which are connected to a power supply and a control motherboard.

[0020] The mounting rod has a set of connecting holes around its entire body. The inner end of the connecting hole in the connecting hole set is connected to the mounting groove, and the outer end of the connecting hole forms an opening at the outer periphery of the mounting rod.

[0021] In some embodiments, the external block includes a cylindrical section and a frustum section. One axial end of the cylindrical section is fixedly connected to the bottom surface with the larger radius in the frustum section. The cylindrical section is used to seal the second connecting groove. Under the condition that the pumping assembly expands the plastic cylinder to seal the well barrel, the frustum section seals the central flow channel in the support cylinder.

[0022] In some implementations, a disassembly head is detachably mounted on the end of the mounting rod away from the support cylinder.

[0023] In some implementations, the outer periphery of the mounting rod is provided with several anti-slip grooves.

[0024] In some embodiments, a sleeve is fitted around the outer edge of the sleeve to form a snap-fit ​​ring, which is located near the bottom of the square groove and snaps into the plastic cylinder.

[0025] The beneficial effects of this application are as follows: It provides an intelligent pump for downhole fluid drainage, which can automatically seal the pump at a set liquid level to drain the accumulated fluid at the bottom of the well, and can also automatically depressurize when there is a risk of over-pressure. During the descent of the intelligent pump, the accumulated fluid in the well enters the central flow channel from bottom to top for drainage. When the intelligent pump reaches a predetermined depth in the liquid, the plastic cylinder expands and seals through the pumping assembly. When the pressure difference threshold between the pressure sensors exceeds a preset value, the plastic cylinder contracts and depressurizes through the pumping assembly. This solution is suitable for drainage in low-pressure gas wells, has good performance, is easy to promote and use, and fills the gap in intelligent pumps for gas well drainage technology. This application can safely and efficiently drain accumulated fluid from the wellbore, and the construction is simple and efficient, solving the problem of reduced production or shutdown caused by the inability to drain accumulated fluid in low-pressure gas wells. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0027] Figure 1 A schematic diagram of the overall structure of the intelligent pump for downhole fluid drainage provided in this application;

[0028] Figure 2 A schematic diagram of the internal structure of the intelligent pump for downhole fluid drainage provided in this application;

[0029] Figure 3 A schematic diagram of the mounting sleeve in the intelligent tap provided in this application;

[0030] Figure 4 A schematic diagram of the specific structure of the two connecting disks in the intelligent tap provided in this application;

[0031] Figure 5 A schematic diagram of the end face of the connecting disk in the intelligent tap provided in this application.

[0032] Attached diagram labels: 1-Mounting rod, 2-Rigid belt, 31-First pressure sensor, 32-Second pressure sensor, 33-Third pressure sensor, 4-Grabbing head, 5-Plastic cylinder, 6-Connector, 7-Support cylinder, 71-First connecting groove, 72-Second connecting groove, 8-Temperature sensor, 9-Electric assembly, 91-Drive rod, 10-Connecting hole group, 11-Anti-slip texture, 12-Cable routing hole, 13-Disassembly head, 14-Power supply, 15-Control mainboard 41-Mounting sleeve, 411-Snap-fit ​​ring, 42-External block, 421-Cylindrical section, 422-Frustum section, 43-Limiting block, 441-First connecting plate, 442-Second connecting plate, 4401-Annular rod, 4402-Inner plate, 4403-Outer plate, 4404-Horizontal rod, 4405-Strip groove, 45-Second movable rod, 46-First movable rod, 47-Elastic element, 48-Square groove, 49-Rotating shaft, 100-Central flow channel. Detailed Implementation

[0033] This embodiment discloses an intelligent pump for downhole fluid drainage, which can automatically seal the pump at a set liquid level to drain the accumulated fluid at the bottom of the well, and can also automatically depressurize when there is a risk of over-pressure, ensuring construction safety.

[0034] Please refer to Figure 1 and Figure 2The intelligent pump includes a pumping mechanism, a rigid band 2, a support cylinder 7, and an installation rod 1. The pumping mechanism includes a grab head 4, a plastic cylinder 5, and a pumping assembly. The top of the grab head 4 is set as a connector 6, and an outlet is formed at the connector 6 in the central flow channel 100 of the pumping mechanism. The pumping assembly is connected to the bottom end of the grab head 4. The plastic cylinder 5 is installed outside the pumping assembly. The pumping assembly is used to expand or restore the plastic cylinder 5. The expanded plastic cylinder 5 seals the wellbore.

[0035] Please refer to the reference. Figure 1 and Figure 2 The rigid belt 2 is fixedly connected to the connector 6. The rigid belt 2 is configured to be connected to the lifting device so that the intelligent puller can be pulled up by the lifting device. The support cylinder 7 abuts against the end of the plastic cylinder 5 away from the grab head 4. Several first connecting grooves 71 are opened around the support cylinder 7. The first connecting grooves 71 are connected to the central flow channel 100.

[0036] Please refer to Figure 1 and Figure 2 The mounting rod 1 is connected to the end of the support cylinder 7 furthest from the plastic cylinder 5. An intelligent control mechanism is installed inside the mounting rod 1, including a transmission rod 91 for actuating the pumping assembly. The support cylinder 7 has a second connecting groove 72, through which the transmission rod 91 passes. The pumping assembly includes an external block 42 adapted to the size of the second connecting groove 72, mounted on the transmission rod 91, and used to seal the second connecting groove 72. Under the condition that the pumping assembly expands the plastic cylinder 5 to seal the wellbore, the external block 42 seals the central flow channel 100. The intelligent control mechanism also includes a sensor that monitors the pressure difference between the upper and lower spaces of the external block 42; when the pressure difference exceeds a preset value, the sealing of the central flow channel 100 by the external block 42 is released.

[0037] In practical application, the intelligent pump in this embodiment is lowered into the gas well via the rigid belt 2. During the descent of the intelligent pump, the central flow channel 100 is not blocked. At this time, the liquid accumulated in the well flows upward from bottom to top, entering the central flow channel 100 through the first connecting groove 71 opened on the side wall of the support cylinder 7, and flowing out from the outlet of the connector 6, thus smoothly lowering the intelligent pump under the liquid.

[0038] Once the intelligent pump reaches the predetermined depth in the liquid, the transmission rod 91 extends, causing the external block 42, fixedly connected to the transmission rod 91, to move up and down along the inner cavity of the support cylinder 7. During this movement, the transmission rod 91 ultimately expands the plastic cylinder 5, bringing it into tight contact with the wellbore, thus achieving a seal between the plastic cylinder 5 and the wellbore. Furthermore, please refer to... Figure 2 The external block 42 blocks the central flow channel 100, as detailed below. Figure 1 The external block 42 moves upward and blocks the upper opening of the support cylinder 7, stopping the drainage.

[0039] When the plastic cylinder 5 needs to be restored, the drive rod 91 retracts, finally restoring the plastic cylinder 5 to its original shape. At this time, the outer block 42 moves with the drive rod 91, without blocking the central flow channel 100, and continues to drain liquid.

[0040] This system automatically releases pressure when there is a risk of upward pressure, ensuring construction safety. Specifically, during normal operation, the lifting device causes the rigid belt 2 to move the intelligent pump upwards, discharging the liquid above the plastic cylinder 5 of the intelligent pump to the ground flow path, achieving a closed drainage operation. When the pressure at the bottom of the pump exceeds a preset safety value during the lifting process, if the pressure difference exceeds 0.025 MPa, the external block 42 will no longer block the central flow channel 100. In this state, the intelligent pump automatically releases the lower pressure, achieving safe operation.

[0041] In summary, the intelligent pump used for downhole fluid drainage in this embodiment can drain water to lower the fluid level in the wellbore and reduce the fluid column pressure at the bottom of the well, creating flow space and pressure differential for natural gas to flow from the formation into the wellbore, thereby increasing natural gas production and recovery rate.

[0042] The intelligent pump in this embodiment is suitable for pumping and draining fluid from low-pressure gas wells. It has good performance, is easy to promote and use, and fills the gap in intelligent pumping technology for gas wells. This intelligent pump can safely and efficiently drain accumulated fluid from the wellbore. Its construction is simple and efficient, solving the problem of reduced or stopped production caused by the inability to drain accumulated fluid from low-pressure gas wells, and restoring gas well productivity.

[0043] In some implementation methods, please refer to Figure 2 and Figure 4 The suction assembly also includes a mounting sleeve 41, two connecting discs, and multiple sets of first movable rods 46 and second movable rods 45. One end of the mounting sleeve 41 is fixedly connected to the end of the grabbing head 4 away from the connecting head 6, and the other end abuts against the end of the support cylinder 7. The plastic cylinder 5 is installed on the outer side of the mounting sleeve 41, and the plastic cylinder 5 and the mounting sleeve 41 form an annular groove.

[0044] Please refer to Figure 2 and Figure 4 Both connecting discs are installed in annular grooves. Each connecting disc has an annular cavity on its outer periphery, and an annular rod 4401 is installed in the annular cavity. The two connecting discs include a first connecting disc 441 that is relatively close to the connecting head 6 and a second connecting disc 442 that is relatively far from the connecting head 6. The transmission rod 91 passes through the second connecting disc 442. One end of the transmission rod 91 is fixedly connected to a limiting block 43. The limiting block 43 is located between the two connecting discs. When the transmission rod 91 extends axially, the relative distance between the two connecting discs can be reduced. When the transmission rod 91 retracts axially, the relative distance between the two connecting discs can be increased in conjunction with the limiting block 43.

[0045] Please refer to Figure 4 In the single set of first movable rod 46 and second movable rod 45, one end of the first movable rod 46 is connected to the annular rod 4401 of the first connecting plate 441, and one end of the second movable rod 45 is connected to the annular rod 4401 of the second connecting plate 442. The other ends of the first movable rod 46 and the other ends of the second movable rod 45 are connected via a rotating shaft 49. Specifically, a mounting base is fixedly installed at the end of the second movable rod 45, and both ends of the rotating shaft 49 are rotatably installed within the mounting base. The rotating shaft 49 passes through the end of the first movable rod 46, thereby connecting the first movable rod 46 and the second movable rod 45 via the rotating shaft 49. Please refer to... Figure 4 Multiple sets of first movable rods 46 and second movable rods 45 are arranged at intervals along the circumference of the connecting plate, preferably at uniform intervals along the circumference.

[0046] In the above-mentioned suction assembly, the relative distance between the two connecting discs is changed by the action of the transmission rod 91, so that the first movable rod 46 and the second movable rod 45 protrude outward or return to their original position, thereby realizing the functional limitation of the suction assembly to expand or restore the plastic cylinder 5.

[0047] In some embodiments, a spring-like element 47 is fitted onto the transmission rod 91. Please refer to [reference needed]. Figure 2 The elastic element 47 is disposed on the side of the second connecting plate 442 away from the first connecting plate 441. One end of the elastic element 47 is fixedly connected to the external block 42. When the transmission rod 91 extends axially, the elastic element 47 abuts against the second connecting plate 442, pushing the second connecting plate 442 toward the first connecting plate 441.

[0048] In some implementation methods, please refer to Figure 5 The connecting plate includes an inner plate 4402, an outer plate 4403, and at least one horizontal rod 4404. The outer periphery of the inner plate 4402 is connected to the inner periphery of the outer plate 4403. The horizontal rod 4404 is radially distributed along the inner plate 4402, and both ends of the horizontal rod 4404 are fixedly connected to the inner periphery of the inner plate 4402. Please refer to... Figure 3 The mounting sleeve 41 has several square grooves 48 distributed along the axial direction. Please refer to... Figure 3 and Figure 5 A horizontal rod 4404 passes through a square groove 48. When the second connecting plate 442 moves up and down, the horizontal rod 4404 cooperates with the square groove 48 to provide guidance. An annular cavity is formed at the outer periphery of the outer plate 4403. The outer plate 4403 has multiple axially distributed strip grooves 4405 formed at its outer periphery. The multiple strip grooves 4405 are evenly spaced along the circumference of the outer plate 4403. The strip grooves 4405 are used to install the first movable rod 46 or the second movable rod 45.

[0049] In some implementation methods, please refer to Figure 2 and Figure 3 The mounting sleeve 41 protrudes from the outer edge of the body to form a snap ring 411. The snap ring 411 is located near the bottom of the square groove 48 and snaps into the plastic cylinder 5.

[0050] In some implementation methods, please refer to Figure 2 The intelligent control mechanism also includes an electric component 9, a power supply 14, a control motherboard 15, a first pressure sensor 31, and a second pressure sensor 32. A transmission rod 91 is mounted on the electric component 9, which can be optionally a servo electric cylinder. The power supply 14 is electrically connected to the electric component 9. The control motherboard 15 is electrically connected to the power supply 14 and to the electric component 9. The first pressure sensor 31 is installed in the central flow channel 100 of the grabbing head 4, and is electrically connected to the power supply 14 and the control motherboard 15. The second pressure sensor 32 is installed inside the mounting rod 1. The mounting rod 1 has a hole in its body, one end of which leads to the second pressure sensor 32, and the other end leads to the outer edge of the mounting rod 1, so that the second pressure sensor 32 can effectively reflect the gas environment pressure below the plastic cylinder 5. The second pressure sensor 32 is electrically connected to the power supply 14 and the control motherboard 15. The pressure difference between the upper and lower spaces of the external block 42 is obtained through the first pressure sensor 31 and the second pressure sensor 32. When the pressure difference exceeds the preset value, the external block 42 releases the blockage of the central flow channel 100.

[0051] Once the intelligent pump reaches the predetermined depth in the liquid, the power supply 14 is controlled by the control motherboard 15, causing the electric component 9 to start. The transmission rod 91 extends from the electric component 9, and the external block 42, fixedly connected to the transmission rod 91, moves up and down along the inner cavity of the support cylinder 7. During its movement, the transmission rod 91 moves between the two connecting discs by being limited by the limiting block 43. When the movable end of the elastic element 47 abuts against the horizontal rod 4404 in the second connecting disc 442, it pushes the second connecting disc 442, which is limited thereto, to move synchronously. The first connecting disc 441, limited by the annular groove, remains stationary. The first movable rod 46 and the second movable rod 45 expand outwards by rotating the shaft 49, achieving an expansion seal in the plastic cylinder 5, blocking the central flow channel 100, and stopping the drainage.

[0052] When the plastic cylinder 5 needs to be restored, the electric assembly 9 retracts the transmission rod 91. During the retraction of the transmission rod 91, the second connecting plate 442 is reset due to the reset of the limit block 43 and the reverse force of the elastic element 47; the first movable rod 46 and the second movable rod 45 restore the plastic cylinder 5 to its original shape through the rotating shaft 49; at this time, the outer block 42 moves with the transmission rod 91, does not block the central flow channel 100, and continues to drain liquid.

[0053] In some implementation methods, please refer to Figure 2The intelligent control mechanism also includes a third pressure sensor 33 and a temperature sensor 8 located in a mounting slot within the mounting rod 1. Both the third pressure sensor 33 and the temperature sensor 8 are connected to the power supply 14 and the control mainboard 15. Please refer to the reference. Figure 1 and Figure 2 The mounting rod 1 has a group of connecting holes 10 around its perimeter. The inner end of the connecting hole in the group of connecting holes 10 communicates with the mounting groove, and the outer end of the connecting hole forms an opening at the outer periphery of the mounting rod 1. A third pressure sensor 33 provides another pressure parameter, enabling the intelligent extractor of this embodiment to more reliably and effectively determine the occurrence of an upward-pushing defect during operation, and subsequently unblock the central flow channel 100.

[0054] In some implementation methods, please refer to Figure 2 The external block 42 includes a cylindrical section 421 and a frustum section 422. One axial end of the cylindrical section 421 is fixedly connected to the bottom surface with the larger radius in the frustum section 422. The cylindrical section 421 is used to seal the second connecting groove 72 to prevent liquid from entering the second connecting groove 72 and to avoid the liquid from affecting the internal pressure of the subsequent transmission rod 91. Under the condition that the pumping assembly expands the plastic cylinder 5 to seal the wellbore, the frustum section 422 seals the central flow channel 100 in the support cylinder 7. Please refer to [reference needed]. Figure 2 Specifically, the upper opening of the support cylinder 7 is sealed, and during sealing, the outer periphery of the frustum section 422 abuts against the upper opening of the support cylinder 7.

[0055] In some implementation methods, please refer to Figure 2 The end of the mounting rod 1 away from the support cylinder 7 is connected to the disassembly head 13, and the disassembly head 13 and the mounting rod 1 are detachably connected.

[0056] In some implementation methods, please refer to Figure 1 The outer periphery of the mounting rod 1 is provided with several anti-slip textures 11.

[0057] Please refer to Figure 2 The mounting rod 1 has several mounting slots of different volumes and wiring holes 12 connecting adjacent mounting slots. The disassembly head 13, power supply 14, third pressure sensor 33 and temperature sensor 8, control main board 15, second pressure sensor 32 and electric assembly 9 are installed in the mounting rod 1 in sequence.

[0058] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0059] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A smart pump for downhole fluid drainage, characterized in that, include: The pumping mechanism includes a grab head, a plastic cylinder, and a pumping assembly. The top of the grab head is provided as a connector, and a flow channel opened in the central flow channel of the pumping mechanism forms a flow outlet at the connector. The pumping assembly is connected to the bottom end of the grab head. The plastic cylinder is installed outside the pumping assembly. The pumping assembly is used to expand or restore the plastic cylinder. In the expanded state, the plastic cylinder plugs the wellbore. A rigid belt is fixedly connected to the connector and is configured to be connected to a lifting device to pull the smart tap upward under the action of the lifting device. The support cylinder abuts against the end of the plastic cylinder away from the grabbing head. The support cylinder has several first connecting grooves around its perimeter, and the first connecting grooves are connected to the central flow channel. An installation rod is connected to the end of the support cylinder away from the plastic cylinder. An intelligent control mechanism is installed within the installation rod. The intelligent control mechanism includes a transmission rod for realizing the action of the suction assembly. The support cylinder has a second connecting groove, through which the transmission rod passes. The suction assembly includes an external block adapted to the size of the second connecting groove. The external block is mounted on the transmission rod and is used to seal the second connecting groove. Under the condition that the suction assembly causes the plastic cylinder to expand and seal the wellbore, the external block seals the central flow channel. The intelligent control mechanism also includes a sensor that monitors the pressure difference between the upper and lower spaces of the external block. When the pressure difference exceeds a preset value, the sealing of the central flow channel by the external block is released.

2. The intelligent tapping device as described in claim 1, characterized in that, The pumping assembly also includes: The mounting sleeve has one end fixedly connected to the end of the grabbing head away from the connector, and the other end abuts against the end of the support cylinder. The plastic cylinder is installed on the outer side of the mounting sleeve, and the plastic cylinder and the mounting sleeve form an annular groove. Two connecting discs are installed in the annular groove. Each connecting disc has an annular cavity on its outer periphery, and an annular rod is installed in the annular cavity. The two connecting discs include a first connecting disc that is relatively close to the connecting head and a second connecting disc that is relatively far from the connecting head. The transmission rod passes through the second connecting disc. A limiting block is fixedly connected to one end of the transmission rod. The limiting block is located between the two connecting discs. When the transmission rod extends axially, the relative distance between the two connecting discs can be reduced. When the transmission rod retracts axially, the relative distance between the two connecting discs can be increased in conjunction with the limiting block. Multiple sets of first and second movable rods are provided. In a single set of first and second movable rods, one end of the first movable rod is connected to the annular rod of the first connecting plate, one end of the second movable rod is connected to the annular rod of the second connecting plate, and the other end of the first movable rod is connected to the other end of the second movable rod via a pivot. The multiple sets of first and second movable rods are arranged at intervals along the circumference of the connecting plate.

3. The intelligent extractor as described in claim 2, characterized in that, The transmission rod is fitted with an elastic element, which is located on the side of the second connecting plate away from the first connecting plate. One end of the elastic element is fixedly connected to the external block. When the transmission rod extends axially, the elastic element abuts against the second connecting plate, pushing the second connecting plate closer to the first connecting plate.

4. The intelligent extractor as described in claim 2, characterized in that, The connecting plate includes an inner plate, an outer plate, and at least one horizontal rod. The outer periphery of the inner plate is connected to the inner periphery of the outer plate. The horizontal rod is distributed radially along the inner plate. Both ends of the horizontal rod are fixedly connected to the inner periphery of the inner plate. The mounting sleeve has several square grooves distributed axially, and the horizontal rod passes through the square grooves. The annular cavity is formed at the outer periphery of the outer disk, and the outer disk has a plurality of axially distributed strip grooves at its outer periphery. The plurality of strip grooves are evenly spaced along the circumference of the outer disk, and the strip grooves are used to install the first movable rod or the second movable rod.

5. The intelligent extractor as described in claim 1, characterized in that, The intelligent control mechanism also includes: An electric assembly, wherein the transmission rod is mounted on the electric assembly; The power source is electrically connected to the electric component; A control motherboard is electrically connected to the power supply, and the control motherboard is connected to the electric component. A first pressure sensor is installed in the central flow channel of the grabbing head. The first pressure sensor is electrically connected to the power supply and to the control motherboard. The second pressure sensor is installed inside the mounting rod. The mounting rod has a hole in its body. One end of the hole is connected to the second pressure sensor, and the other end is connected to the outer edge of the mounting rod. The second pressure sensor is electrically connected to the power supply and to the control motherboard. The pressure difference between the upper and lower spaces of the external block is obtained through the first pressure sensor and the second pressure sensor.

6. The intelligent tapping device as described in claim 5, characterized in that, The intelligent control mechanism also includes a third pressure sensor and a temperature sensor located in a mounting slot within the mounting rod. Both the third pressure sensor and the temperature sensor are connected to the power supply and the control motherboard. The mounting rod has a set of connecting holes around its entire body. The inner end of the connecting hole in the set of connecting holes is connected to the mounting groove, and the outer end of the connecting hole forms an opening at the outer periphery of the mounting rod.

7. The intelligent tapping device as described in claim 1, characterized in that, The external block includes a cylindrical section and a frustum section. One axial end of the cylindrical section is fixedly connected to the bottom surface with the larger radius in the frustum section. The cylindrical section is used to seal the second connecting groove. Under the condition that the pumping assembly expands the plastic cylinder to seal the well barrel, the frustum section seals the central flow channel in the support cylinder.

8. The intelligent tapping device as described in claim 1, characterized in that, The end of the mounting rod away from the support cylinder is detachably equipped with a disassembly head.

9. The intelligent extractor as described in claim 1, characterized in that, The outer periphery of the mounting rod is provided with several anti-slip textures.

10. The intelligent tapping device as described in claim 4, characterized in that, The mounting sleeve protrudes from the outer edge to form a snap-fit ​​ring, which is located near the bottom of the square groove and snaps into the plastic cylinder.

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