Electric control packer with protection function

Abstract

The invention belongs to the technical field of packers, and discloses an electric control packer with a protection function, which comprises a central 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 piece and a second magnetic piece, the magnetic steel sleeve is rotatably arranged on the outer wall of the central cylinder, and the magnetic steel shaft is rotatably arranged on the outer wall of the central cylinder; the lower end of the magnetic steel sleeve is connected with the output end of the motor; the transmission assembly sleeves the outer wall of the central cylinder and is in transmission connection with the upper end of the magnetic steel shaft, the upper pressing ring fixedly sleeves the outer wall of the central cylinder, and the rubber cylinder sleeves the outer wall of the central cylinder and is clamped between the transmission assembly and the upper pressing ring. By arranging the first magnetic part and the second magnetic part, the first magnetic part and the second magnetic part can attract each other to transmit torque so as to achieve setting of the rubber sleeve, and when the torque of the magnetic steel shaft is larger 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 mutually so as to cut off transmission of the torque. And flexible connection is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of packers, in particular to an electrically controlled packer with a protective function. Background Art

[0002] Electric-controlled packers have the characteristics of simple and fast setting and unsealing processes, and are often used in short-term testing operations that require reservoir isolation. However, due to their harsh working environment, well depths generally exceeding a thousand meters, high downhole temperatures and pressures, and easy scaling of casing in the well, these factors can easily lead to torque fluctuations when the electric-controlled packer is set, resulting in a surge in instantaneous current, burning the power supply line or drive motor, and causing well jamming accidents, seriously affecting the safety and reliability of the electric-controlled packer. Summary of the Invention

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

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] The electric-controlled packer with protection function includes:

[0006] center tube;

[0007] a motor, arranged on the outer wall of the central tube;

[0008] A magnetic coupling assembly, comprising a magnetic steel sleeve, a magnetic steel shaft, a first magnetic member, and a second magnetic member, wherein the magnetic steel sleeve is rotatably disposed on the outer wall of the central cylinder, and the lower end of the magnetic steel sleeve is connected to the output end of the motor, the inner wall of the magnetic steel sleeve is provided with the first magnetic member, the magnetic steel shaft is rotatably disposed on the outer wall of the central cylinder, and the outer wall of the magnetic steel shaft is provided with the second magnetic member, when the torque of the magnetic steel shaft is less than the magnetic attraction between the first magnetic member and the second magnetic member, the second magnetic member and the first magnetic member transmit the torque through the magnetic attraction, and when the torque of the magnetic steel shaft is greater than the magnetic attraction between the first magnetic member and the second magnetic member, the second magnetic member and the first magnetic member slip against each other;

[0009] a transmission assembly, sleeved on the outer wall of the central tube and in transmission connection with the upper end of the magnetic steel shaft, wherein the magnetic steel shaft is capable of driving the transmission assembly to reciprocate along the axis of the central tube when rotating;

[0010] An upper pressure ring, fixedly sleeved on the outer wall of the central tube;

[0011] The rubber cylinder is sleeved on the outer wall of the central cylinder and is clamped between the transmission assembly and the upper pressure ring.

[0012] As an optional scheme, the first magnetic part is an outer annular magnetic steel sheet, and the second magnetic part 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 are attracted to each other.

[0013] As an optional solution, the transmission assembly includes a reduction gear, a lead screw, a nut, a rubber cylinder shaft and a lower pressure ring. The reduction gear and the lead screw are rotatably sleeved on the outer wall of the center tube. The lower end of the reduction gear is connected to the upper end of the magnetic shaft, the lead screw is connected to the upper end of the reduction gear, the nut is threadedly connected to the lead screw, the rubber cylinder shaft is sleeved outside the center tube and fixedly connected to the nut, the lower pressure ring is fixedly set on the outer wall of the rubber cylinder shaft, and the rubber cylinder is clamped between the upper pressure ring and the lower pressure ring.

[0014] As an optional solution, a stroke monitoring component is further included, and the stroke monitoring component is used to monitor the displacement of the rubber cylinder shaft.

[0015] As an optional solution, the stroke monitoring assembly includes an anti-rotation sleeve, a fixing pin and a linear displacement sensor. The anti-rotation sleeve is fixedly arranged on the outer wall of the center tube and is located above the rubber cylinder shaft. The anti-rotation sleeve is provided with a through groove. The upper end of the rubber cylinder shaft is provided with a side hole. The fixing pin is fixedly arranged 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 be extended into the side hole. When the rubber cylinder shaft moves along the axial direction of the center tube, the distance by which the detection rod of the linear displacement sensor is inserted into the side hole changes.

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

[0017] As an optional solution, the rubber cylinder shaft and the nut are fixedly connected by shear nails. When the relative axial force between the rubber cylinder shaft and the nut is greater than the bearing load of the shear nails, the shear nails can be sheared off.

[0018] As an optional solution, a circuit board is further included, on which a current limiting protection switch is provided. The current limiting protection switch 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 assembly is further included, and the pressure measuring assembly is used to monitor the pressure above the rubber cylinder, below the rubber cylinder and the central channel of the central cylinder.

[0020] As an optional solution, the pressure measuring assembly includes three pressure sensors, and the electrically controlled seal with a protective function also includes an outer shell, a lower body and an upper joint. The outer shell is sleeved on the outer wall of the center tube, and the lower body is arranged at the lower end of the center tube and connected between the center tube and the outer shell. The upper joint is arranged at the upper end of the center tube and connected between the center tube and the outer shell. One pressure sensor is connected to the lower body for monitoring the pressure below the rubber tube, and the other two pressure sensors are connected to the upper joint and are respectively used to monitor the pressure above the rubber tube and the central channel of the center tube.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides an electrically controlled seal with a protective function. By disposing a first magnetic component on the inner wall of a magnetic steel sleeve and a second magnetic component on the outer wall of a magnetic steel shaft, the first and second magnetic components can attract each other to transmit torque, thereby achieving rubber seal setting. When the torque of the magnetic steel shaft is greater than the magnetic attraction between the first and second magnetic components, the first and second magnetic components can slip against each other to cut off the transmission of torque. The present invention achieves flexible transmission of motor torque, effectively prevents excessive current caused by a surge in torque, effectively protects the power supply line, and significantly improves reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 1 is a schematic structural diagram of an electrically controlled packer with a protective function provided by an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A magnified view of the structure at point A;

[0025] Figure 3 yes Figure 1 A magnified view of the structure at B in the middle;

[0026] Figure 4 yes Figure 1 A magnified view of the structure at C in the middle;

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

[0028] In the picture:

[0029] 1. Center tube; 2. Motor; 3. Magnetic steel sleeve; 4. Magnetic steel shaft; 5. First magnetic part; 6. Second magnetic part; 7. Reduction gear; 701. First internal gear; 702. External gear; 703. Second internal gear; 8. Screw; 9. Nut; 10. Rubber cylinder shaft; 11. Lower pressure ring; 12. Upper pressure ring; 121. Hall switch; 13. Rubber cylinder; 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 collection channel; 22. Upper joint; 221. Second pressure collection channel; 222. Third pressure collection channel; 23. Lower mounting chamber; 24. Upper mounting chamber. DETAILED DESCRIPTION

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

[0031] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in 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 through specific implementation methods.

[0034] like Figure 1-Figure 5As shown, an embodiment of the present invention provides an electrically controlled packer with a protective function, which includes a center tube 1, a motor 2, a magnetic coupling assembly, a transmission assembly, an upper pressure ring 12 and a rubber tube 13. When the electrically controlled packer with a protective function is set in a well, the rubber tube 13 can be compressed and abut against the inner wall of the well to achieve sealing. When the compression force of the rubber tube 13 is released, the rubber tube 13 returns to its original state to achieve unsealing. Specifically, the motor 2 is arranged on the outer wall of the central tube 1 to provide torque; the magnetic coupling assembly includes a magnetic sleeve 3, a magnetic shaft 4, a first magnetic part 5 and a second magnetic part 6. The magnetic sleeve 3 is rotatably arranged on the outer wall of the central tube 1, and the lower end of the magnetic sleeve 3 is connected to the output end of the motor 2 (that is, the rotor shaft, the rotor shaft is hollowed out, and its equivalent diameter is 25 mm, which can meet the overcurrent requirement and will not produce a throttling pressure difference). When the 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 a first magnetic part 5, the magnetic shaft 4 is rotatably arranged on the outer wall of the central tube 1, and the outer wall of the magnetic shaft 4 is provided with a second magnetic part 6. The first magnetic part 5 and the second magnetic part 6 can attract each other to make 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 tube 1 and connected to the outer wall of the central tube 1. The upper end of the magnetic steel shaft 4 is connected for transmission, the upper pressure ring 12 is fixedly sleeved on the outer wall of the center tube 1, the rubber cylinder 13 is sleeved on the outer wall of the center tube 1 and clamped between the transmission assembly and the upper pressure ring 12, and the magnetic steel shaft 4 can drive the transmission assembly to reciprocate along the axis of the center tube 1 when rotating, so as to compress or release the rubber cylinder 13 to achieve sealing or unsealing; when the torque of the electrically controlled sealer with a protective function is normal, that is, the torque transmitted to the magnetic steel shaft 4 by the transmission assembly is less than the magnetic attraction force between the first magnetic part 5 and the second magnetic part 6, there is no relative movement between the first magnetic part 5 and the second magnetic part 6, and the torque is transmitted normally; when the sealing end is accidentally stuck, causing the torque transmitted to the magnetic steel shaft 4 by the transmission assembly to be greater than the magnetic attraction force between the first magnetic part 5 and the second magnetic part 6, the first magnetic part 5 and the second magnetic part 6 slip against each other to cut off the transmission of torque and achieve flexible transmission.

[0035] The present invention realizes flexible transmission of the torque of the motor 2 through the magnetic coupling assembly, effectively prevents excessive current caused by a surge in torque, effectively protects the power supply line and the motor 2, and greatly improves reliability and stability.

[0036] Specifically, the first magnetic part 5 is an outer annular magnetic steel sheet, and the second magnetic part 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 are attracted to each other. This structure makes the magnetic attraction between the first magnetic part 5 and the second magnetic part 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 cylinder 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 center tube 1. The lower end of the reduction gear 7 is fixedly connected to the upper end of the magnetic steel shaft 4. The lower end of the lead screw 8 is fixedly connected to the upper end of the reduction gear 7. The nut 9 is threadedly connected to the lead screw 8. The rubber cylinder shaft 10 is sleeved outside the center tube 1 and fixedly connected to the nut 9. The lower pressure ring 11 is fixedly set on the outer wall of the rubber cylinder shaft 10. The rubber cylinder 13 is clamped 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 decelerated 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 axis direction of the center tube 1, and at the same time drives the linear reciprocating motion of the rubber cylinder shaft 10, thereby realizing the movement of the lower pressure ring 11 toward or away from the rubber cylinder 13 to compress or release the rubber cylinder 13.

[0038] The reduction gear 7 includes a first internal gear 701, an external gear 702 and a second internal gear 703 that are meshed with each other. The first internal gear 701 is fixedly connected to the magnetic shaft 4, and the second internal gear 703 is fixedly connected to the lead screw 8. When the magnetic 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 drives the second internal gear 703 to rotate to achieve power transmission.

[0039] The electrically controlled sealer with a protective function also includes a stroke monitoring component, which can monitor the displacement of the rubber cylinder shaft 10, and then detect the position of the rubber cylinder 13, so as to realize the real-time judgment of the stroke position changes of the rubber cylinder 13 during sealing and unsealing on the ground. If the rubber cylinder shaft 10 reaches the designed stroke, the shutdown operation can be performed.

[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 arranged on the outer wall of the center tube 1 and is located above the rubber cylinder shaft 10. The anti-rotation sleeve 14 is provided with a through groove, and the upper end of the rubber cylinder shaft 10 is provided with a side hole. The fixing pin 15 is fixedly arranged 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 be extended into the side hole. When the rubber cylinder shaft 10 moves back and forth along the axial direction of the center tube 1, the distance that the detection rod of the linear displacement sensor 16 extends into the side hole changes. By monitoring the position distance of the detection rod extending into the side hole, the displacement of the rubber cylinder shaft 10 can be monitored.

[0041] The upper pressure ring 12 is equipped with a Hall effect switch 121, and a magnetic column is mounted on the upper end of the rubber cylinder shaft 10. When the rubber cylinder 13 is unsealed, the rubber cylinder shaft 10 moves away from the rubber cylinder 13. When the magnetic column triggers the Hall effect switch 121, the control motor 2 automatically stops. This structure uses the Hall effect sensor principle. When the relative movement between the rubber cylinder shaft 10 and the center cylinder 1 reaches a preset value, the circuit is automatically disconnected, achieving the shutdown of the protective electronically controlled packer.

[0042] Preferably, refer to Figure 3 The rubber cylinder shaft 10 and the nut 9 are fixedly connected by shear pins 17. When the relative axial force between the rubber cylinder shaft 10 and the nut 9 exceeds the load-bearing capacity of the shear pins 17, the shear pins 17 can be sheared, releasing the rubber cylinder 13 and achieving unsealing. This structure can achieve forced unsealing of the rubber cylinder 13 in the event that all the above protection functions fail, avoiding well jam accidents.

[0043] The electric-controlled packer with protection function also includes a pressure measuring assembly for monitoring the pressure above and below the rubber cylinder 13 and the central channel of the central cylinder 1. The pressure measuring assembly enables the electric-controlled packer with protection function to have the ability of self-sealing.

[0044] Refer again Figure 4-Figure 5 The electrically controlled seal with protective function also includes an outer shell 20, a lower body 21 and an upper joint 22. The outer shell 20 is composed of a multi-section combination. The outer shell 20 is sleeved on the outer wall of the center tube 1, and the lower body 21 is arranged at the lower end of the center tube 1 and connected between the center tube 1 and the outer shell 20. The upper joint 22 is arranged at the upper end of the center tube 1 and connected between the center tube 1 and the outer shell 20. There are a lower installation bin 23 and an upper installation bin 24 between the center tube 1 and the outer shell 20.

[0045] The pressure measuring assembly includes three pressure sensors 19, one pressure sensor 19 is connected to the lower body 21 and is located in the lower installation chamber 23, and a first pressure collection channel 211 is provided on the lower body 21. The pressure sensor 19 is connected to the space outside the electric-controlled packer with a protective function through the first pressure collection 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 joint 22 and are located in the upper installation chamber 24, and the upper joint 22 is provided with a second pressure collection channel 221 and a third pressure collection channel 222. One of the other two pressure sensors 19 is connected to the space outside the electric-controlled packer with a protective function through the second pressure collection channel 221 to collect the pressure above the rubber cylinder 13 in the well, and the other pressure sensor 19 is connected to the central channel of the central tube 1 through the third pressure collection channel 222 to collect the pressure in the central channel.

[0046] The pressure sensor 19 is a 0-35 MPa high-precision sensor.

[0047] The electrically controlled sealer with protection function also includes a circuit board 18, which is arranged in the lower installation compartment 23, and 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.

[0048] In this embodiment, the upper joint 22 is connected to the logging faucet (not shown in the figure). The sealing process is as follows: a sealing signal is sent to the circuit board 18 through the ground control system, the circuit board 18 executes the power supply command, controls the motor 2 to rotate forward, and transmits the output torque to the rubber cylinder shaft 10 so that the rubber cylinder shaft 10 drives the lower pressure ring 11 to move toward the rubber cylinder 13 to compress the rubber cylinder 13 to achieve sealing. During the sealing process, the stroke monitoring component monitors the displacement change of the rubber cylinder shaft 10, and feeds back the displacement change information to the circuit board 18, and transmits it to the ground control system to read the status information; the unsealing process is as follows: an unsealing signal is sent to the circuit board 18 through the ground control system, the circuit board 18 controls the motor 2 to reverse, and transmits the output torque to the rubber cylinder shaft 10 so that the rubber cylinder shaft 10 drives the lower pressure ring 11 to move away from the rubber cylinder 13 to release the rubber cylinder 13 to achieve unsealing. During the unsealing process, the stroke monitoring component monitors the displacement change of the rubber cylinder shaft 10, and feeds back the displacement change information 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 the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An electrically controlled packer with a protective function, characterized in that: include: Center tube (1); A motor (2) is arranged on the outer wall of the central tube (1); A magnetic coupling assembly comprises a magnetic steel sleeve (3), a magnetic steel shaft (4), a first magnetic member (5) and a second magnetic member (6), wherein the magnetic steel sleeve (3) is rotatably arranged on the outer wall of the central cylinder (1), and the lower end of the magnetic steel sleeve (3) is connected to the output end of the motor (2), the inner wall of the magnetic steel sleeve (3) is provided with the first magnetic member (5), the magnetic steel shaft (4) is rotatably arranged on the outer wall of the central cylinder (1), and the outer wall of the magnetic steel shaft (4) is provided with the second magnetic member (6), when the torque of the magnetic steel shaft (4) is less than the magnetic attraction between the first magnetic member (5) and the second magnetic member (6), the second magnetic member (6) and the first magnetic member (5) transmit the torque through the magnetic attraction, and when the torque of the magnetic steel shaft (4) is greater than the magnetic attraction between the first magnetic member (5) and the second magnetic member (6), the second magnetic member (6) and the first magnetic member (5) slip against each other; a transmission assembly, sleeved on the outer wall of the central tube (1) and in transmission connection with the upper end of the magnetic steel shaft (4), wherein the magnetic steel shaft (4) is capable of driving the transmission assembly to reciprocate along the axis of the central tube (1) when rotating; An upper pressure ring (12) is fixedly sleeved on the outer wall of the central tube (1); The rubber cylinder (13) is sleeved on the outer wall of the central cylinder (1) and is clamped between the transmission assembly and the upper pressure ring (12).

2. The electrically controlled packer with protection function according to claim 1, characterized in that: The first magnetic part (5) is an outer annular magnetic steel sheet, and the second magnetic part (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 are attracted to each other.

3. The electrically controlled packer with protection 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 cylinder 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 center tube (1). The lower end of the reduction gear (7) is connected to the upper end of the magnetic steel shaft (4). The lead screw (8) is connected to the upper end of the reduction gear (7). The nut (9) is threadedly connected to the lead screw (8). The rubber cylinder shaft (10) is sleeved outside the center tube (1) and fixedly connected to the nut (9). The lower pressure ring (11) is fixedly arranged on the outer wall of the rubber cylinder shaft (10). The rubber cylinder (13) is clamped between the upper pressure ring (12) and the lower pressure ring (11).

4. The electrically controlled packer with protection function according to claim 3, characterized in that: It also includes a stroke monitoring component, which is used to monitor the displacement of the rubber cylinder shaft (10).

5. The electrically controlled packer with protection function according to claim 4, characterized in that: The stroke monitoring assembly includes an anti-rotation sleeve (14), a fixing pin (15) and a linear displacement sensor (16). The anti-rotation sleeve (14) is fixedly arranged on the outer wall of the center tube (1) and is located above the rubber cylinder shaft (10). The anti-rotation sleeve (14) is provided with a through groove. The upper end of the rubber cylinder shaft (10) is provided with a side hole. The fixing pin (15) is fixedly arranged 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 be extended into the side hole. When the rubber cylinder shaft (10) moves along the axial direction of the center tube (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 protection function according to claim 3, characterized in that: The upper pressure ring (12) is provided with a Hall switch (121), and the upper end of the rubber cylinder shaft (10) is provided with a magnetic column. When the rubber cylinder shaft (10) moves away from the rubber cylinder (13), the magnetic column triggers the Hall switch (121) and controls the motor (2) to stop automatically.

7. The electrically controlled packer with protection function according to claim 3, characterized in that: The rubber cylinder shaft (10) and the nut (9) are fixedly connected via shear nails (17); when the relative axial force between the rubber cylinder shaft (10) and the nut (9) is greater than the bearing load of the shear nails (17), the shear nails (17) can be sheared off.

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

9. The electrically controlled packer with protection function according to claim 1, characterized in that: It also includes a pressure measuring assembly, which is used to monitor the pressure above the rubber cylinder (13), below the rubber cylinder (13) and the central channel of the central cylinder (1).

10. The electrically controlled packer with protection function according to claim 9, characterized in that: The pressure measuring assembly includes three pressure sensors (19), and the electrically controlled seal with a protective function also includes an outer shell (20), a lower body (21) and an upper joint (22). The outer shell (20) is sleeved on the outer wall of the center tube (1), and the lower body (21) is arranged at the lower end of the center tube (1) and connected between the center tube (1) and the outer shell (20). The upper joint (22) is arranged at the upper end of the center tube (1) and connected between the center tube (1) and the outer shell (20). One of the pressure sensors (19) is connected to the lower body (21) for monitoring the pressure below the rubber cylinder (13), and the other two pressure sensors (19) are connected to the upper joint (22) and are respectively used to monitor the pressure above the rubber cylinder (13) and the central channel of the center tube (1).

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