Electrically controlled packer with protection function

Abstract

The application belongs to the technical field of packers, and discloses an electrically-controlled packer with a protection function, which comprises a center cylinder, a motor, a magnetic coupling assembly, a transmission assembly, an upper pressing ring and a rubber cylinder. The magnetic coupling assembly comprises a magnetic steel sleeve, a magnetic steel shaft, a first magnetic part and a second magnetic part. The magnetic steel sleeve is rotatably arranged on the outer wall of the center cylinder, and the lower end of the magnetic steel sleeve is connected with the output end of the motor. The transmission assembly is sleeved on the outer wall of the center cylinder and is in transmission connection with the upper end of the magnetic steel shaft. The upper pressing ring is fixedly sleeved on the outer wall of the center cylinder, and the rubber cylinder is sleeved on the outer wall of the center cylinder and is clamped between the transmission assembly and the upper pressing ring. The first magnetic part and the second magnetic part can be attracted to each other to transmit torque to realize the setting of the rubber cylinder. When the torque of the magnetic steel shaft is greater than the magnetic attraction force between the first magnetic part and the second magnetic part, the first magnetic part and the second magnetic part can slide relative to each other to cut off the transmission of the torque, thereby realizing flexible connection.

Description

Technical Field

[0001] This invention relates to the field of packer technology, and more particularly to an electrically controlled packer with protective functions. Background Technology

[0002] Electrically controlled packers are characterized by simple and quick setting and unsetting processes, and are often used in short-term test operations that require reservoir isolation. However, due to the harsh working environment, well depths are generally over a thousand meters, downhole temperatures and pressures are high, and the casing is prone to scaling, the torque fluctuations during setting of the electrically controlled packer can easily lead to a surge in instantaneous current, burning out the power supply line or drive motor, and causing well jamming accidents, which seriously affect the safety and reliability of the electrically controlled packer. Summary of the Invention

[0003] The purpose of this invention is to provide an electrically controlled packer with protective functions, which can prevent the motor or power supply line from burning out.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] Electrically controlled packers with protective functions include:

[0006] Central tube;

[0007] The motor is located on the outer wall of the central cylinder;

[0008] A magnetic coupling assembly includes a magnetic sleeve, a magnetic shaft, a first magnetic element, and a second magnetic element. The magnetic sleeve is rotatably disposed on the outer wall of the central cylinder, and the lower end of the magnetic sleeve is connected to the output end of the motor. The inner wall of the magnetic sleeve is provided with the first magnetic element. The magnetic shaft is rotatably disposed on the outer wall of the central cylinder, and the outer wall of the magnetic shaft is provided with the second magnetic element. When the torque of the magnetic shaft is less than the magnetic attraction force between the first magnetic element and the second magnetic element, the second magnetic element and the first magnetic element transmit torque through the magnetic attraction force. When the torque of the magnetic shaft is greater than the magnetic attraction force between the first magnetic element and the second magnetic element, the second magnetic element and the first magnetic element slip against each other.

[0009] A transmission assembly is sleeved on the outer wall of the central cylinder and is connected to the upper end of the magnet shaft. When the magnet shaft rotates, it can drive the transmission assembly to reciprocate along the axis of the central cylinder.

[0010] The upper pressure ring is fixedly sleeved on the outer wall of the central cylinder;

[0011] A rubber sleeve is fitted onto the outer wall of the central cylinder and sandwiched between the transmission assembly and the upper pressure ring.

[0012] As an alternative, the first magnetic component is an outer annular magnetic steel sheet, and the second magnetic component is an inner annular magnetic steel sheet. The outer wall of the outer annular magnetic steel sheet is fixedly connected to the inner wall of the magnetic steel sleeve, and the inner wall of the inner annular magnetic steel sheet is fixedly connected to the outer wall of the magnetic steel shaft. The outer annular magnetic steel sheet is sleeved on the inner annular magnetic steel sheet, and the inner wall of the outer annular magnetic steel sheet and the outer wall of the inner annular magnetic steel sheet attract each other.

[0013] As an optional embodiment, the transmission assembly includes a reduction gear, a lead screw, a nut, a rubber sleeve shaft, and a lower pressure ring. The reduction gear and the lead screw are rotatably sleeved on the outer wall of the central cylinder. The lower end of the reduction gear is connected to the upper end of the magnet shaft, the lead screw is connected to the upper end of the reduction gear, the nut is threaded onto the lead screw, the rubber sleeve shaft is sleeved on the outside of the central cylinder and fixedly connected to the nut, the lower pressure ring is fixedly disposed on the outer wall of the rubber sleeve shaft, and the rubber sleeve is sandwiched between the upper pressure ring and the lower pressure ring.

[0014] As an optional solution, a stroke monitoring component is also included, which is used to monitor the displacement of the rubber sleeve shaft.

[0015] As an optional solution, the stroke monitoring component includes an anti-rotation sleeve, a fixing pin, and a linear displacement sensor. The anti-rotation sleeve is fixedly disposed on the outer wall of the central cylinder and located above the rubber sleeve shaft. The anti-rotation sleeve is provided with a through groove. The upper end of the rubber sleeve shaft is provided with a side hole. The fixing pin is fixedly disposed in the through groove. The telescopic seat of the linear displacement sensor is fixedly connected to the fixing pin. The detection rod of the linear displacement sensor can extend into the side hole. When the rubber sleeve shaft moves along the axial direction of the central cylinder, the distance by which the detection rod of the linear displacement sensor is inserted into the side hole changes.

[0016] As an alternative, the upper pressure ring is equipped with a Hall switch, and the upper end of the rubber sleeve shaft is equipped with a magnetic column. When the rubber sleeve shaft moves away from the rubber sleeve, the magnetic column triggers the Hall switch and controls the motor to stop automatically.

[0017] As an alternative, the rubber sleeve shaft and the nut are fixedly connected by a shear pin. When the relative axial force between the rubber sleeve shaft and the nut is greater than the load-bearing capacity of the shear pin, the shear pin can be cut off.

[0018] As an optional solution, a circuit board is also included, on which a current limiting protection switch is provided, which can automatically cut off the current when the operating current of the motor exceeds a limit value.

[0019] As an optional solution, a pressure measuring component is also included, which is used to monitor the pressure above the rubber sleeve, below the rubber sleeve, and in the central channel of the central cylinder.

[0020] As an optional solution, the pressure measuring assembly includes three pressure sensors. The electrically controlled packer with protective functions also includes a housing, a lower body, and an upper connector. The housing is fitted onto the outer wall of the central cylinder, and the lower body is located at the lower end of the central cylinder and connected between the central cylinder and the housing. The upper connector is located at the upper end of the central cylinder and connected between the central cylinder and the housing. One pressure sensor is connected to the lower body to monitor the pressure below the rubber tube, and the other two pressure sensors are connected to the upper connector to monitor the pressure above the rubber tube and the pressure in the central channel of the central cylinder, respectively.

[0021] The beneficial effects of this invention are:

[0022] This invention provides an electrically controlled packer with protective functions. A first magnetic element is disposed on the inner wall of the magnet sleeve, and a second magnetic element is disposed on the outer wall of the magnet shaft. The first and second magnetic elements can attract each other to transmit torque, achieving sleeve setting. When the torque of the magnet shaft exceeds the magnetic attraction between the first and second magnetic elements, they can slip against each other, cutting off torque transmission. This invention achieves flexible transmission of motor torque, effectively preventing excessive current caused by torque surges, effectively protecting the power supply line, and significantly improving reliability and stability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the electrically controlled packer with protective function provided in the embodiment of the present invention;

[0024] Figure 2 yes Figure 1 Enlarged view of the structure at point A in the middle;

[0025] Figure 3 yes Figure 1 Enlarged view of the structure at point B;

[0026] Figure 4 yes Figure 1 Enlarged view of the structure at point C;

[0027] Figure 5 yes Figure 1 Enlarged view of the structure at point D.

[0028] In the picture:

[0029] 1. Center cylinder; 2. Motor; 3. Magnet sleeve; 4. Magnet shaft; 5. First magnetic component; 6. Second magnetic component; 7. Reduction gear; 701. First internal gear; 702. External gear; 703. Second internal gear; 8. Lead screw; 9. Nut; 10. Rubber sleeve shaft; 11. Lower pressure ring; 12. Upper pressure ring; 121. Hall switch; 13. Rubber sleeve; 14. Anti-rotation sleeve; 15. Fixing pin; 16. Linear displacement sensor; 17. Shear pin; 18. Circuit board; 19. Pressure sensor; 20. Housing; 21. Lower body; 211. First pressure acquisition channel; 22. Upper connector; 221. Second pressure acquisition channel; 222. Third pressure acquisition channel; 23. Lower mounting chamber; 24. Upper mounting chamber. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-5As shown, this embodiment of the invention provides an electrically controlled packer with protective function, which includes a central cylinder 1, a motor 2, a magnetic coupling assembly, a transmission assembly, an upper pressure ring 12, and a rubber sleeve 13. When the electrically controlled packer with protective function is installed in the well, the rubber sleeve 13 can be compressed to abut against the inner wall of the well to achieve setting. When the compression force of the rubber sleeve 13 is released, the rubber sleeve 13 returns to its original state to achieve unsealing. Specifically, motor 2 is mounted on the outer wall of the central cylinder 1 to provide torque; the magnetic coupling assembly includes a magnetic sleeve 3, a magnetic shaft 4, a first magnetic element 5, and a second magnetic element 6. The magnetic sleeve 3 is rotatably mounted on the outer wall of the central cylinder 1, and its lower end is connected to the output end of motor 2 (i.e., the rotor shaft, which is hollowed out with an equivalent diameter of 25mm to meet overcurrent requirements without generating throttling pressure difference). When motor 2 drives the rotor shaft to rotate, it can drive the magnetic sleeve 3 to rotate synchronously. The inner wall of the magnetic sleeve 3 is provided with the first magnetic element 5. The magnetic shaft 4 is rotatably mounted on the outer wall of the central cylinder 1, and its outer wall is provided with the second magnetic element 6. The first magnetic element 5 and the second magnetic element 6 can attract each other so that the magnetic sleeve 3 and the magnetic shaft 4 form an integral structure to transmit torque; the transmission assembly is sleeved on the outer wall of the central cylinder 1 and connected to... The upper end of the magnet shaft 4 is connected to the transmission, and the upper pressure ring 12 is fixedly sleeved on the outer wall of the central cylinder 1. The rubber sleeve 13 is sleeved on the outer wall of the central cylinder 1 and sandwiched between the transmission assembly and the upper pressure ring 12. When the magnet shaft 4 rotates, it can drive the transmission assembly to reciprocate along the axis of the central cylinder 1 to compress or release the rubber sleeve 13 to achieve setting or unsealing. When the torque of the electrically controlled packer with protection function is normal, that is, when the torque transmitted by the transmission assembly to the magnet shaft 4 is less than the magnetic attraction between the first magnetic element 5 and the second magnetic element 6, there is no relative movement between the first magnetic element 5 and the second magnetic element 6, and the torque is transmitted normally. When the setting end is accidentally jammed, the torque transmitted by the transmission assembly to the magnet shaft 4 is greater than the magnetic attraction between the first magnetic element 5 and the second magnetic element 6. The first magnetic element 5 and the second magnetic element 6 slip against each other to cut off the transmission of torque and achieve flexible transmission.

[0035] This invention achieves flexible torque transmission of motor 2 through magnetic coupling assembly, effectively preventing excessive current caused by torque surge, effectively protecting the power supply line and motor 2, and greatly improving reliability and stability.

[0036] Specifically, the first magnetic element 5 is an outer annular magnetic steel sheet, and the second magnetic element 6 is an inner annular magnetic steel sheet. The outer wall of the outer annular magnetic steel sheet is fixedly connected to the inner wall of the magnetic steel sleeve 3, and the inner wall of the inner annular magnetic steel sheet is fixedly connected to the outer wall of the magnetic steel shaft 4. The outer annular magnetic steel sheet is sleeved on the inner annular magnetic steel sheet, and the inner wall of the outer annular magnetic steel sheet and the outer wall of the inner annular magnetic steel sheet attract each other. This structure makes the magnetic attraction force between the first magnetic element 5 and the second magnetic element 6 stronger and the force more uniform.

[0037] Reference Figure 3 The transmission assembly includes a reduction gear 7, a lead screw 8, a nut 9, a rubber sleeve shaft 10, and a lower pressure ring 11. The reduction gear 7 and the lead screw 8 are rotatably sleeved on the outer wall of the central cylinder 1. The lower end of the reduction gear 7 is fixedly connected to the upper end of the magnetic shaft 4, and the lower end of the lead screw 8 is fixedly connected to the upper end of the reduction gear 7. The nut 9 is threaded onto the lead screw 8. The rubber sleeve shaft 10 is sleeved on the outside of the central cylinder 1 and fixedly connected to the nut 9. The lower pressure ring 11 is fixedly set on the outer wall of the rubber sleeve shaft 10. The rubber sleeve 13 is sandwiched between the upper pressure ring 12 and the lower pressure ring 11. When the rotor shaft of the motor 2 rotates, it drives the reduction gear 7 to rotate through the magnetic coupling assembly. After the motor 2 is reduced in speed by the reduction gear 7, it drives the lead screw 8 to rotate. The rotation of the lead screw 8 realizes the linear reciprocating motion of the nut 9 along the axial direction of the central cylinder 1, and at the same time drives the linear reciprocating motion of the rubber sleeve shaft 10, thereby realizing the movement of the lower pressure ring 11 toward or away from the rubber sleeve 13 to compress or release the rubber sleeve 13.

[0038] The reduction gear 7 includes a first internal gear 701, an external gear 702, and a second internal gear 703 that mesh with each other. The first internal gear 701 is fixedly connected to the magnet shaft 4, and the second internal gear 703 is fixedly connected to the lead screw 8. When the magnet shaft 4 rotates, it drives the first internal gear 701 to rotate, the first internal gear 701 drives the external gear 702 to rotate, and the external gear 702 then drives the second internal gear 703 to rotate, so as to realize the transmission of power.

[0039] The electrically controlled packer with protective functions also includes a stroke monitoring component, which can monitor the displacement of the rubber sleeve shaft 10 and thus detect the position of the rubber sleeve 13. This allows for real-time judgment of the stroke position changes of the rubber sleeve 13 during setting and unsetting on the ground. If the rubber sleeve shaft 10 reaches the designed stroke, the machine can be stopped.

[0040] Specifically, refer to Figure 4 The stroke monitoring component includes an anti-rotation sleeve 14, a fixing pin 15, and a linear displacement sensor 16. The anti-rotation sleeve 14 is fixedly installed on the outer wall of the central cylinder 1 and located above the rubber sleeve shaft 10. The anti-rotation sleeve 14 is provided with a through groove, and the upper end of the rubber sleeve shaft 10 is provided with a side hole. The fixing pin 15 is fixedly installed in the through groove. The telescopic seat of the linear displacement sensor 16 is fixedly connected to the fixing pin 15. The detection rod of the linear displacement sensor 16 can extend into the side hole. When the rubber sleeve shaft 10 reciprocates along the axial direction of the central cylinder 1, the distance of the detection rod of the linear displacement sensor 16 extending into the side hole changes. By monitoring the position distance of the detection rod extending into the side hole, the displacement of the rubber sleeve shaft 10 can be monitored.

[0041] The upper pressure ring 12 is equipped with a Hall switch 121, and a magnetic column is installed at the upper end of the rubber sleeve shaft 10. When the rubber sleeve 13 is unsealed, the rubber sleeve shaft 10 moves away from the rubber sleeve 13. When the magnetic column triggers the Hall switch 121, it controls the motor 2 to stop automatically. This structure adopts the Hall sensor principle. When the relative movement between the rubber sleeve shaft 10 and the central cylinder 1 reaches a preset value, the circuit can be automatically cut off, realizing the shutdown of the electrically controlled packer with protection function.

[0042] Preferably, refer to Figure 3 The rubber sleeve shaft 10 and the nut 9 are fixedly connected by a shear pin 17. When the relative axial force between the rubber sleeve shaft 10 and the nut 9 exceeds the load-bearing capacity of the shear pin 17, the shear pin 17 can be sheared to release the rubber sleeve 13 and achieve unsealing. This structure can achieve forced unsealing of the rubber sleeve 13 in the event that all the above-mentioned protective functions fail, thus avoiding well jamming accidents.

[0043] The electrically controlled packer with protective functions also includes a pressure testing component for monitoring the pressure above, below, and in the central channel of the central cylinder 1. This pressure testing component enables the electrically controlled packer with protective functions to perform self-testing.

[0044] Refer to Figures 4-5 The electrically controlled packer with protective function also includes a housing 20, a lower body 21, and an upper connector 22. The housing 20 is composed of multiple sections and is fitted onto the outer wall of the central cylinder 1. The lower body 21 is located at the lower end of the central cylinder 1 and is connected between the central cylinder 1 and the housing 20. The upper connector 22 is located at the upper end of the central cylinder 1 and is connected between the central cylinder 1 and the housing 20. There is a lower mounting chamber 23 and an upper mounting chamber 24 between the central cylinder 1 and the housing 20.

[0045] The pressure measurement assembly includes three pressure sensors 19. One pressure sensor 19 is connected to the lower body 21 and located inside the lower mounting chamber 23. The lower body 21 is provided with a first pressure acquisition channel 211. The pressure sensor 19 communicates with the space outside the electrically controlled packer with protective function through the first pressure acquisition channel 211 to collect the pressure below the rubber cylinder 13 in the well. The other two pressure sensors 19 are connected to the upper connector 22 and located inside the upper mounting chamber 24. The upper connector 22 is provided with a second pressure acquisition channel 221 and a third pressure acquisition channel 222. One of the other two pressure sensors 19 communicates with the space outside the electrically controlled packer with protective function through the second pressure acquisition channel 221 to collect the pressure above the rubber cylinder 13 in the well. The other pressure sensor 19 communicates with the central channel of the central cylinder 1 through the third pressure acquisition channel 222 to collect the pressure in the central channel.

[0046] Pressure sensor 19 is a high-precision sensor with a range of 0-35MPa.

[0047] The electrically controlled packer with protective functions also includes a circuit board 18, which is located in the lower mounting compartment 23. A current limiting protection switch is provided on the circuit board 18. When the operating current of the motor 2 exceeds the limit value, the current limiting protection switch can automatically cut off the current to prevent the motor 2 and the power supply line from burning out.

[0048] In this embodiment, the upper connector 22 is connected to the logging head (not shown in the figure). The setting process is as follows: the ground control system sends a setting signal to the circuit board 18, the circuit board 18 executes a power supply command, controls the motor 2 to rotate forward, and transmits the output torque to the rubber sleeve shaft 10 so that the rubber sleeve shaft 10 drives the lower pressure ring 11 to move towards the rubber sleeve 13, thereby compressing the rubber sleeve 13 to achieve setting. During the setting process, the stroke monitoring component monitors the displacement change of the rubber sleeve shaft 10 and feeds the displacement change information back to the circuit board 18, and transmits it to the ground control system to read the status information. The unsealing process is as follows: the ground control system sends an unsealing signal to the circuit board 18, the circuit board 18 controls the motor 2 to rotate in reverse, and transmits the output torque to the rubber sleeve shaft 10 so that the rubber sleeve shaft 10 drives the lower pressure ring 11 to move away from the rubber sleeve 13, thereby releasing the rubber sleeve 13 to achieve unsealing. During the unsealing process, the stroke monitoring component monitors the displacement change of the rubber sleeve shaft 10 and feeds the displacement change information back to the circuit board 18, and transmits it to the ground control system to read the status information.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An electrically controlled packer with protective functions, characterized in that, include: Central tube (1); The motor (2) is disposed on the outer wall of the central cylinder (1); A magnetic coupling assembly includes a magnetic sleeve (3), a magnetic shaft (4), a first magnetic element (5), and a second magnetic element (6). The magnetic sleeve (3) is rotatably disposed on the outer wall of the central cylinder (1), and the lower end of the magnetic sleeve (3) is connected to the output end of the motor (2). The inner wall of the magnetic sleeve (3) is provided with the first magnetic element (5). The magnetic shaft (4) is rotatably disposed on the outer wall of the central cylinder (1), and the outer wall of the magnetic shaft (4) is provided with the second magnetic element (6). When the torque of the magnetic shaft (4) is less than the magnetic attraction force between the first magnetic element (5) and the second magnetic element (6), the second magnetic element (6) and the first magnetic element (5) transmit torque through the magnetic attraction force. When the torque of the magnetic shaft (4) is greater than the magnetic attraction force between the first magnetic element (5) and the second magnetic element (6), the second magnetic element (6) and the first magnetic element (5) slip against each other. The transmission assembly is sleeved on the outer wall of the central cylinder (1) and is connected to the upper end of the magnetic steel shaft (4). When the magnetic steel shaft (4) rotates, it can drive the transmission assembly to reciprocate along the axis of the central cylinder (1). The upper pressure ring (12) is fixedly sleeved on the outer wall of the central cylinder (1); The rubber sleeve (13) is fitted onto the outer wall of the central cylinder (1) and sandwiched between the transmission assembly and the upper pressure ring (12).

2. The electrically controlled packer with protective function according to claim 1, characterized in that, The first magnetic component (5) is an outer annular magnetic steel sheet, and the second magnetic component (6) is an inner annular magnetic steel sheet. The outer wall of the outer annular magnetic steel sheet is fixedly connected to the inner wall of the magnetic steel sleeve (3), and the inner wall of the inner annular magnetic steel sheet is fixedly connected to the outer wall of the magnetic steel shaft (4). The outer annular magnetic steel sheet is sleeved on the inner annular magnetic steel sheet, and the inner wall of the outer annular magnetic steel sheet and the outer wall of the inner annular magnetic steel sheet attract each other.

3. The electrically controlled packer with protective function according to claim 1, characterized in that, The transmission assembly includes a reduction gear (7), a lead screw (8), a nut (9), a rubber sleeve shaft (10), and a lower pressure ring (11). The reduction gear (7) and the lead screw (8) are rotatably sleeved on the outer wall of the central cylinder (1). The lower end of the reduction gear (7) is connected to the upper end of the magnet shaft (4). The lead screw (8) is connected to the upper end of the reduction gear (7). The nut (9) is threaded onto the lead screw (8). The rubber sleeve shaft (10) is sleeved on the outside of the central cylinder (1) and is fixedly connected to the nut (9). The lower pressure ring (11) is fixedly disposed on the outer wall of the rubber sleeve shaft (10). The rubber sleeve (13) is sandwiched between the upper pressure ring (12) and the lower pressure ring (11).

4. The electrically controlled packer with protective function according to claim 3, characterized in that, It also includes a stroke monitoring component for monitoring the displacement of the rubber sleeve shaft (10).

5. The electrically controlled packer with protective function according to claim 4, characterized in that, The travel monitoring component includes an anti-rotation sleeve (14), a fixing pin (15), and a linear displacement sensor (16). The anti-rotation sleeve (14) is fixedly disposed on the outer wall of the central cylinder (1) and located above the rubber tube shaft (10). The anti-rotation sleeve (14) is provided with a through groove. The upper end of the rubber tube shaft (10) is provided with a side hole. The fixing pin (15) is fixedly disposed in the through groove. The telescopic seat of the linear displacement sensor (16) is fixedly connected to the fixing pin (15). The detection rod of the linear displacement sensor (16) can extend into the side hole. When the rubber tube shaft (10) moves along the axial direction of the central cylinder (1), the distance by which the detection rod of the linear displacement sensor (16) is inserted into the side hole changes.

6. The electrically controlled packer with protective function according to claim 3, characterized in that, The upper pressure ring (12) is equipped with a Hall switch (121), and the upper end of the rubber tube shaft (10) is equipped with a magnetic column. When the rubber tube shaft (10) moves away from the rubber tube (13), the magnetic column triggers the Hall switch (121) and controls the motor (2) to stop automatically.

7. The electrically controlled packer with protective function according to claim 3, characterized in that, The rubber sleeve shaft (10) and the nut (9) are fixedly connected by a shear pin (17). When the relative axial force between the rubber sleeve shaft (10) and the nut (9) is greater than the load-bearing capacity of the shear pin (17), the shear pin (17) can be sheared.

8. The electrically controlled packer with protective function according to claim 1, characterized in that, It also includes a circuit board (18), on which a current limiting protection switch is provided. The current limiting protection switch can automatically cut off the current after the operating current of the motor (2) exceeds a limit value.

9. The electrically controlled packer with protective function according to claim 1, characterized in that, It also includes a pressure measuring component for monitoring the pressure above the rubber tube (13), below the rubber tube (13), and in the central channel of the central tube (1).

10. The electrically controlled packer with protective function according to claim 9, characterized in that, The pressure measuring assembly includes three pressure sensors (19). The electrically controlled packer with protection function also includes a housing (20), a lower body (21), and an upper connector (22). The housing (20) is fitted onto the outer wall of the central cylinder (1), and the lower body (21) is located at the lower end of the central cylinder (1) and connected between the central cylinder (1) and the housing (20). The upper connector (22) is located at the upper end of the central cylinder (1) and connected between the central cylinder (1) and the housing (20). One pressure sensor (19) is connected to the lower body (21) to monitor the pressure below the rubber tube (13), and the other two pressure sensors (19) are connected to the upper connector (22) and are used to monitor the pressure above the rubber tube (13) and the pressure in the central channel of the central cylinder (1), respectively.

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