Mechanical augmented compression electrically controlled packer and method of use

Abstract

The application discloses a mechanical force-amplification compression type electrically-controlled packer and a use method thereof, and relates to the field of packers, which comprises a center pipe, a locking block ring, a rubber tube and an electrically-controlled setting and releasing mechanism which are sequentially arranged on the center pipe from top to bottom; the electrically-controlled setting and releasing mechanism comprises a linear driver and a gear and rack auxiliary force-amplification component, the output end of the linear driver is connected with the input end of the gear and rack auxiliary force-amplification component, and the output end of the gear and rack auxiliary force-amplification component is in contact with the rubber tube. The application adopts a mechanical transmission mode to realize the setting and releasing of the electrically-controlled packer, and the setting and releasing only needs to control the linear driver to push out and retract, so that the control mode is simple and reliable.

Description

Technical Field

[0001] This invention relates to the field of packer technology, specifically to a mechanically amplified compression type electrically controlled packer and its usage method. Background Technology

[0002] After years of development, the oilfield has experienced uneven production profiles due to inter-layer conflicts. Simultaneously, years of water injection have led to a gradual increase in the overall water cut of the produced fluid, widening the inter-layer differences and making the oil-water distribution increasingly complex. The degree of water flooding and the distribution of remaining oil vary across production layers. A production layer with high pressure, high production volume, and high water cut inevitably interferes with and limits the production of other layers. Therefore, accurately understanding the pressure, fluid, and other parameters of each reservoir layer, and identifying and exploiting oil-rich layers, is essential for adjusting potential, increasing oil production, and reducing water content. This allows for better balanced exploitation of various oil layers and improved recovery rates. Furthermore, the oilfield's stratified injection and production processes are developing towards intelligent technology. Obtaining production data such as stratified pressure and fluid properties can significantly improve the precision of intelligent injection and production processes, thereby enabling intelligent adjustment and optimization of development plans.

[0003] When determining formation pressure in well tests, tubing is typically used to lower testing tools into the well, resulting in high operating costs and a long construction period, hindering rapid testing. For older wells seeking remaining oil-rich producing layers for adjustments and potential tapping, this method is relatively uneconomical. However, cable formation testing technology offers a much more convenient operation, improving well operation efficiency and effectively solving these problems. The principle of cable formation testing technology is to lower the testing tool to a predetermined depth using a cable. Electrically controlled packers are then positioned and released downhole to control a single target layer. Formation fluid samples are obtained using an electrically controlled pump and sampler, and the target layer pressure is recorded to obtain stratified fluid parameters. The electrically controlled packer is a key tool in cable formation testing technology. Currently, most electrically controlled packers use a motor-driven pressure pump to achieve packer positioning or a reducer-driven screw drive combined with a hydraulic system to increase the positioning force. Unsealing is achieved either by switching the solenoid directional valve to release pressure, or by having another pressure relief motor drive a lead screw to open the pressure relief valve. Electro-hydraulic packers with electro-hydraulic systems have relatively complex structures, and the hydraulic system has high requirements for sealing performance, posing a risk of hydraulic oil leakage, which can lead to problems such as ineffective sealing and unsealing.

[0004] Announcement No. CN110374544B discloses an electric packer and its packing method, including a central tube and a control system. The central tube is a hollow tube, and a motor, an oil tank, a plunger pump, and a guide sleeve are sequentially arranged around its circumference. A thrust piston that can move up and down is arranged around the circumference of the guide sleeve. The control system controls the forward and reverse rotation of the motor to drive the plunger pump, controls the inlet and outlet switching of three solenoid valves, and controls the on / off of five oil circuits to pressurize the upper and lower chambers of the thrust piston, thereby realizing the packer setting and unsealing operations.

[0005] The existing technology uses an electro-hydraulic system to control the setting and unsetting of the packer, and the motor, plunger pump and other components are all located in the annulus. For packers with smaller dimensions, the arrangement of the motor and plunger pump is difficult due to the size limitation of the annulus, and the motor power is not very large, making it difficult to ensure sufficient setting force. At the same time, the hydraulic system has a complex structure design and is controlled by multiple solenoid valves. If one solenoid valve fails, the packer will fail, resulting in process failure.

[0006] Announcement No. CN212563158U discloses an electric packer for oil wells, including an electric seat assembly, an electric release assembly, an upper casing, an inner casing assembly, a rubber sleeve, a mechanical release seat, and a pressure relief plug.

[0007] The existing technology uses a motor-driven pressure pump to pressurize and set the seal during setting, and relies on a pressure relief motor to drive a lead screw to open the pressure relief valve to achieve unsealing. It controls multiple motors, making the control system more complex and increasing the probability of problems. At the same time, the oil circuit system has a complex structural design and poses a risk of leakage.

[0008] Announcement No. CN105221098B discloses an electric packer and its usage method, which adopts a transmission method combining threaded drive and hydraulic drive to convert the output force of the actuator into a setting force sufficient to meet the setting requirements. Compared with a simple transmission mechanism, the force ratio is larger, the requirements for the torque and power supply pressure of the actuator are smaller, and the size of the actuator is also smaller.

[0009] This existing technology, due to its use of a hydraulic system, still suffers from leakage, resulting in problems such as the packer not being able to seal effectively.

[0010] Announcement No. CN112681999B discloses a compression packer that injects hydraulic oil into the central tube, which then flows into the push chamber through the guide chamber. Under pressure, the push plate moves within the push chamber, ultimately achieving relative movement between the first compression plate and the second compression plate. The first and second compression plates simultaneously compress the rubber cylinder, resulting in uniform force on the rubber cylinder.

[0011] The existing technology uses a rack and pinion drive, but the gear shaft is fixed, which only changes the direction of the force and does not have a force-increasing effect.

[0012] Announcement No. CN215860080U discloses a combined packer for oil well operations. The outer surface of the casing inside the sleeve is fixedly provided with several evenly distributed racks along the axial direction. Each rack is provided with a half gear on one side. A protrusion is fixedly connected to the half gear. A rotating shaft is fixedly connected to the half gear and is arranged coaxially with it. A connector is rotatably installed at both ends of the rotating shaft. Each connector is fixedly connected to the sleeve through a connecting rod. Several locking blocks corresponding to the half gears are embedded in the outer surface of the sleeve along the circumferential direction. The inner side of the locking block is fixedly connected to two adjacent connectors through several elastic elements.

[0013] The existing technology uses a rack and pinion drive, but the gear rotation shaft is fixed, and it only serves to adjust the position of the cam without having a force-increasing effect.

[0014] Announcement No. CN112031697B discloses a stable self-expanding packer. The rack ring rotates under the action of a first rotating gear, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear, and a second rotating gear. This rotation drives the two baffles at the bottom of the annular self-expanding rubber cylinder to rotate downwards, causing the annular self-expanding rubber cylinder to fall and contact with hydraulic oil, thus expanding the annular self-expanding rubber cylinder and finally completing the fixed sealing between the well wall and the packer.

[0015] The gear transmission mechanism in the prior art is used to drop the rubber tube. However, the gear transmission mechanism in the prior art has a complex structure and is limited by size, making it unsuitable for applying clamping force.

[0016] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of the present invention. Regarding the more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0017] In view of the above-mentioned defects in the existing technology, the purpose of this invention is to provide a mechanically amplified compression type electrically controlled packer and its usage method.

[0018] To achieve the above objectives, the present invention adopts the following technical solution:

[0019] On one hand, the present invention provides a mechanically amplified compression type electrically controlled packer, including a central tube, wherein a locking retaining ring, a rubber sleeve, and an electric setting and unsetting mechanism are sleeved on the central tube from top to bottom; the electric setting and unsetting mechanism includes a linear driver and a gear and rack auxiliary force amplification component, wherein the output end of the linear driver is connected to the input end of the gear and rack auxiliary force amplification component, and the output end of the gear and rack auxiliary force amplification component is in contact with the rubber sleeve.

[0020] Furthermore, the gear and rack auxiliary force amplification component includes a fixed rack, a transmission gear assembly, a power rack, a force transmission inner tube, and a force transmission pressure ring;

[0021] Specifically, the fixed rack is installed in the inner hole of the supporting outer cylinder, and the supporting outer cylinder is a fixed component;

[0022] Specifically, the central tube is provided with a transmission gear assembly guide groove, the transmission gear assembly is located in the transmission gear assembly guide groove, the transmission gear assembly includes a gear carrier, a gear shaft and a transmission gear, and the transmission gear is rotatably mounted inside the gear carrier via the gear shaft;

[0023] Specifically, the lower end of the power rack is connected to the output end of the linear actuator;

[0024] Specifically, the transmission gear meshes with the fixed rack and the power rack respectively; the force transmission pressure ring is sleeved outside the central tube, the force transmission pressure ring is located below the rubber cylinder, and the force transmission pressure ring is in contact with the rubber cylinder; the upper end of the force transmission inner tube is connected to the force transmission pressure ring, and the lower end of the force transmission inner tube is connected to the gear frame.

[0025] Furthermore, the lower end of the supporting outer cylinder is connected to the outer cylinder, and the lower end of the outer cylinder is connected to the outer wall of the lower connector.

[0026] Furthermore, the gear frame is configured as a rectangular structure, and a rectangular through hole of the same size as the gear frame is provided on the lower end vertical wall of the force transmission inner tube. The gear frame is installed in the rectangular through hole at the lower end of the force transmission inner tube.

[0027] Furthermore, the linear actuator includes a motor and a screw drive assembly, the screw drive assembly including a force transmission joint, a lead screw, a force transmission nut, and a force transmission sleeve;

[0028] Specifically, the lower end of the lead screw is connected to the output shaft of the motor, a force transmission nut is threaded onto the lead screw, a force transmission sleeve is fixedly connected to the outer wall of the force transmission nut, a force transmission connector is connected to the upper end of the force transmission sleeve, and the upper end of the force transmission connector is connected to the power rack.

[0029] Specifically, the central tube is provided with a guide screw groove along the axial direction, the outer wall of the force transmission joint is connected to a guide screw, the guide screw extends into the guide screw groove, and the guide screw slides up and down along the guide screw groove.

[0030] Furthermore, it also includes a rotation stabilizing component, which includes a motor bearing housing, a first convex ring disposed in the inner hole of the motor bearing housing, a combined bearing disposed above the first convex ring, and the lead screw passing through the combined bearing;

[0031] Specifically, the lower end of the motor bearing housing is connected to a motor connecting plate, the motor connecting plate is connected to the motor, and the output shaft of the motor is connected to a lead screw;

[0032] Specifically, the upper end of the outer wall of the motor bearing housing is connected to the transmission sealing outer cylinder, the upper end of the transmission sealing outer cylinder is connected to the central tube, the lower end of the outer wall of the motor bearing housing is connected to the motor outer cylinder, and a sealing plug is provided on the inner wall of the motor outer cylinder below the motor.

[0033] Furthermore, the lower end of the outer cylinder of the motor is connected to the inner tube, the inner wall of the outer cylinder of the motor is provided with a sealing step, the inner tube presses the sealing plug tightly against the sealing step, and the lower end of the inner tube is connected to the inner wall of the lower connector.

[0034] Furthermore, the sealing plug is provided with a cable connector hole for connecting a cable connector, and the inner tube wall is provided with a flow hole for the cable to pass through.

[0035] Furthermore, the central tube is fitted with an upward lifting and unsealing assembly, which is located above the locking retaining ring. The upward lifting and unsealing assembly includes an upper connector, a connecting ring, and a locking block.

[0036] Specifically, the upper connector, connecting ring, and locking retaining ring are slidably sleeved on the outer wall of the central tube;

[0037] Specifically, the upper connector is connected to the central tube via a release screw, the lower end of the upper connector is connected to a connecting ring, the connecting ring is sleeved outside the locking retaining ring, and the locking retaining ring is connected to the central tube via a locking block;

[0038] Specifically, the locking block passes through the locking retaining ring and is embedded in the central tube. The upper and lower edges of the mating surface between the locking block and the central tube are both guide surfaces. The connecting ring covers the locking block and restricts the locking block from coming out of the central tube.

[0039] Secondly, the present invention provides a method for using a mechanically amplified compression type electrically controlled packer, comprising the following steps:

[0040] During setting, the linear actuator outputs thrust, which, through the meshing of the power rack and the transmission gear, and the meshing of the transmission gear and the fixed rack, pushes the transmission gear to roll upward. With the cooperation of the gear carrier and the guide groove of the transmission gear assembly, the gear carrier moves linearly upward. The gear carrier pushes the force transmission inner tube and the force transmission pressure ring, and the force transmission pressure ring compresses the rubber cylinder to achieve setting.

[0041] When the packer is unsealed, the linear actuator outputs a pulling force, the power rack moves downward, the transmission gear rolls downward, and drives the gear carrier to move linearly downward, thereby driving the force transmission inner tube and the force transmission pressure ring to move downward, releasing the elasticity of the rubber sleeve and realizing the unsealing of the packer.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] 1. This invention uses a mechanical transmission method to realize the setting and unsetting of the electrically controlled packer. Setting and unsetting only require controlling the forward and reverse rotation of the motor, and the control method is simple and reliable.

[0044] 2. This invention employs a combination of helical transmission and a rack and pinion auxiliary force-enhancing mechanism to improve the setting force. This rack and pinion auxiliary force-enhancing mechanism uses a power rack to transmit force and displacement, a fixed rack as a stationary component, and a transmission gear as a driven component. Through the meshing of the power rack and transmission gear, and the transmission gear and fixed rack, the transmission gear assembly moves up and down, generating a multiplied push-pull force. Then, through the cooperation of the guiding structure and the force transmission structure, the packer is set and released.

[0045] 3. This invention adopts a force-enhancing method that combines helical transmission and gear rack auxiliary force-enhancing mechanism, which can not only complete the rubber sleeve setting but also eliminate the risk of leakage. It solves the problem that the setting force is relatively small when using a simple helical transmission mechanism, and solves the problem that the structure and control method of the electro-hydraulic system-controlled packer are more complex and have the risk of leakage. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of a mechanically amplified compression type electrically controlled packer according to the present invention;

[0047] Figure 2 This is a schematic diagram of the gear and rack auxiliary force-enhancing component in this invention;

[0048] Figure 3 This is a schematic diagram of the transmission gear assembly in this invention.

[0049] In the diagram: 1. Upper connector; 2. Unsealing screw; 3. Connecting ring; 4. Locking block retaining ring; 5. Locking block; 6. Locking retaining ring; 7. Glue tube;

[0050] 8. Central tube; 8-1. Guide groove for transmission gear assembly; 8-2. Guide groove for guide screw; 9. Force transmission pressure ring; 10. Force transmission screw; 11. Fixed rack; 12. Force transmission inner tube.

[0051] Transmission gear assembly 13, gear carrier 13-1, gear shaft 13-2, transmission gear 13-3;

[0052] Support outer cylinder 14, force transmission screw guide groove 14-1;

[0053] 15. Power rack and pinion; 16. Pressure cap; 17. Force transmission joint; 18. Guide screw; 19. Nut retaining ring; 20. Lead screw; 21. Transmission sealing outer cylinder; 22. Outer cylinder; 23. Force transmission sleeve; 24. Force transmission nut; 25. Bearing cover; 26. Combined bearing; 27. Bearing retaining ring; 28. Bearing lock nut; 29. ​​Motor bearing housing; 30. Coupling; 31. Motor connecting plate; 32. DC high temperature reducer; 33. Motor outer cylinder.

[0054] Sealing plug 34, cable connector hole 34-1, inner tube 35, flow hole 35-1; pressure ring 36, lower connector 37. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Example 1:

[0057] Please see Figures 1 to 3 The present invention provides a mechanically amplified compression type electrically controlled packer, comprising a central tube 8, wherein a locking retaining ring 6, a rubber sleeve 7, and an electric setting and unsetting mechanism are sleeved from top to bottom on the central tube 8. The electric setting and unsetting mechanism includes a linear driver and a gear and rack auxiliary force amplification component. The output end of the linear driver is connected to the input end of the gear and rack auxiliary force amplification component, and the output end of the gear and rack auxiliary force amplification component is in contact with the rubber sleeve 7.

[0058] Further, the gear and rack auxiliary force-enhancing assembly includes a fixed rack 11, a transmission gear assembly 13, a power rack 15, a force-transmitting inner tube 12, and a force-transmitting pressure ring 9; the fixed rack 11 is installed in the inner hole of the supporting outer cylinder 14, and the supporting outer cylinder 14 is a fixed component; the central tube 8 is provided with a transmission gear assembly guide groove 8-1, and the transmission gear assembly 13 is located in the transmission gear assembly guide groove 8-1. The transmission gear assembly includes a gear carrier 13-1, a gear shaft 13-2, and a transmission gear 13-3. Gear 13-3 is mounted inside gear carrier 13-1 via gear shaft 13-2, and the transmission gear 13-3 can rotate along gear shaft 13-2; the lower end of the power rack 15 is connected to the output end of the linear actuator; the transmission gear 13-3 meshes with the fixed rack 11 and the power rack 15 respectively; the force transmission pressure ring 9 is sleeved outside the central tube 8, and the force transmission pressure ring 9 is located below the rubber sleeve 7; the upper end of the force transmission inner tube 12 is connected to the force transmission pressure ring 9, and the lower end of the force transmission inner tube 12 is connected to the gear carrier 13-1.

[0059] The up-and-down movement of the power rack 15 causes the gear assembly 13 to move up and down along the fixed rack 11, thereby driving the force transmission inner tube 12 and the force transmission pressure ring 9 to achieve the setting and unsealing of the rubber sleeve 7. The distance between the power rack 15 and the fixed gear 11 is the power arm, and the distance between the power rack 15 and the fixed gear 11 is the resistance arm. The power arm is twice the resistance arm, thus achieving force amplification transmission.

[0060] Specifically, the fixed rack 11 is fixedly connected to the supporting outer cylinder 14 by screws.

[0061] Specifically, the gear frame 13-1 is configured as a rectangular structure, and a rectangular through hole of the same size as the gear frame 13-1 is provided on the lower end vertical wall of the force transmission inner tube 12. The transmission gear assembly 13 is installed on the rectangular through hole at the lower end of the force transmission inner tube 12.

[0062] Specifically, the force-transmitting pressure ring 9 and the force-transmitting inner tube 12 are connected by a force-transmitting screw 10. The force-transmitting screw 10 is located in the guide groove 8-1 of the transmission gear assembly. A radial through hole is provided at the lower end of the force-transmitting pressure ring 9. An annular groove corresponding to the radial through hole is provided on the outer wall of the force-transmitting inner tube 12. The force-transmitting screw 10 is threadedly connected to the radial through hole and inserted into the annular groove.

[0063] Specifically, the upper end of the supporting outer cylinder 14 is sleeved on the outer wall of the force transmission pressure ring 9. The supporting outer cylinder 14 is slidably engaged with the outer surface of the force transmission pressure ring 9. The supporting outer cylinder 14 has a force transmission screw guide groove 14-1. The end of the force transmission screw 10 away from the force transmission inner tube 12 is located in the force transmission screw guide groove 14-1. The force transmission screw 10 can slide up and down along the force transmission screw guide groove 14-1. The force transmission screw guide groove 14-1 is used to stabilize the force transmission pressure ring 9 and the force transmission inner tube 12 and prevent deflection.

[0064] Specifically, the lower end of the supporting outer cylinder 14 is connected to the upper end of the outer cylinder 22, and the lower part of the outer cylinder 22 is fitted onto the upper outer circle of the lower connector 37 and is positioned by screws and locked by the pressure ring 36.

[0065] Furthermore, the linear actuator includes a DC high-temperature reducer 32 and a helical transmission assembly. The helical transmission assembly includes a force transmission joint 17, a lead screw 20, a force transmission nut 24, and a force transmission sleeve 23. The lower end of the lead screw 20 is connected to the output shaft of the DC high-temperature reducer 32. The force transmission nut 24 is threaded onto the lead screw 20. The force transmission sleeve 23 is fixedly connected to the outer wall of the force transmission nut 24. The upper end of the force transmission sleeve 23 is connected to the force transmission joint 17. The upper end of the force transmission joint 17 is connected to the power rack 15. The central tube 8 is provided with a guide screw guide groove 8-2 along the axial direction. The outer wall of the force transmission joint 17 is connected to a guide screw 18. The guide screw 18 extends into the guide screw guide groove 8-2 and slides up and down along the guide screw guide groove 8-2.

[0066] The rotation of the lead screw 20 is converted into linear motion through the guide screw groove 8-2, the guide screw 18, and the force transmission nut 24.

[0067] Specifically, a nut retaining ring 19 is fitted on the upper part of the lead screw 20. The nut retaining ring 19 is fixed on the upper step of the lead screw 20 by a retaining ring. The nut retaining ring 19 is used to prevent the force transmission nut from coming out.

[0068] Specifically, the force transmission sleeve 23 and the force transmission nut 24, and the force transmission sleeve 23 and the force transmission connector 17 are all connected by threads and fixed with anti-loosening pins.

[0069] Specifically, the lower end of the power rack 15 is provided as a square anti-rotation end, which is installed in the anti-rotation hole of the corresponding shape inside the upper end of the force transmission joint 17. A limiting ring is provided at the root of the anti-rotation end of the power rack 15. The outer wall of the limiting ring is connected to the pressure cap 16. The pressure cap is threadedly connected to the outer wall of the limiting ring and the outer wall of the force transmission joint 17 to lock the power rack 15 and the force transmission joint 17.

[0070] Furthermore, it also includes a rotation stabilizing component, which includes a motor bearing housing 29. A first convex ring is provided in the inner hole of the motor bearing housing 29. A bearing retaining ring 27 is provided at the upper end of the first convex ring. A combined bearing 26 is provided at the upper end of the bearing retaining ring 27. A bearing cover 25 is provided at the upper end of the combined bearing 26. The bearing cover 25 is connected to the motor bearing housing 29 and presses the combined bearing 26. A lead screw 20 passes through the combined bearing 26. A bearing locking nut 28 is provided below the combined bearing 26 on the lead screw 20 to lock the bearing. Nut 28 is locked in contact with the inner ring of combined bearing 26; the lower end of motor bearing housing 29 is connected to motor connecting plate 31, motor connecting plate 31 is connected to DC high temperature reducer 32, the output shaft of DC high temperature reducer 32 and lead screw 20 are connected by coupling 30, the upper end of the outer wall of motor bearing housing 29 is connected to transmission sealing outer cylinder 21, the upper end of transmission sealing outer cylinder 21 is connected to center tube 8, the lower end of the outer wall of motor bearing housing 29 is connected to motor outer cylinder 33, and a sealing plug 34 is provided on the inner wall of motor outer cylinder 33 below DC high temperature reducer 32.

[0071] Specifically, the bearing cover 25 and the motor bearing seat 29, the DC high-temperature reducer 32 and the motor connecting plate 31, and the motor connecting plate 31 and the motor bearing seat 29 are all fixed with screws.

[0072] Specifically, the lower end of the motor outer cylinder 33 is connected to the inner tube 35, the inner wall of the motor outer cylinder 33 is provided with a sealing step, the inner tube 35 presses the sealing plug 34 against the sealing step, and the lower end of the inner tube 35 is threadedly connected to the lower connector 37.

[0073] Specifically, the sealing plug 34 is provided with a cable connector hole 34-1 for connecting a cable connector, and the inner tube 35 has an overflow hole 35-1 on its vertical wall for passing through a cable. The cable passes through the cable connector hole 34-1 and connects to the control circuit and DC high-temperature reducer 32 inside the motor outer cylinder 33.

[0074] Specifically, the motor bearing housing 29 and the motor outer cylinder 33, the motor bearing housing 29 and the transmission sealing outer cylinder 21, and the force transmission sleeve 23 and the force transmission connector 17 are all connected by threads and fixed by anti-loosening pins, and sealed with sealing ring grooves and sealing rings; a sealing ring is provided between the sealing plug 34 and the motor outer cylinder 33; a second convex ring is provided on the inner wall of the transmission sealing outer cylinder 21, and a sealing ring is provided on the inner wall of the second convex ring, so that the inner wall of the second convex ring is sealed with the outer wall of the force transmission sleeve 23.

[0075] Specifically, the DC high-temperature reducer 32 includes a motor and a reducer.

[0076] Example 2:

[0077] Based on Embodiment 1, in this embodiment, the central tube 8 is fitted with an upward lifting and unsealing assembly, which is located above the locking ring 6. The upward lifting and unsealing assembly includes an upper connector 1, a connecting ring 3, and a locking block 5. The upper connector 1, connecting ring 3, and locking ring 6 are slidably fitted on the outer wall of the central tube 8. The upper connector 1 is connected to the central tube 8 through an unsealing shear pin 2. The lower end of the upper connector 1 is connected to the connecting ring 3. The connecting ring 3 is fitted outside the locking ring 6. The locking ring 6 is connected to the central tube 8 through the locking block 5. The locking block 5 passes through the locking ring 6 and is embedded in the central tube 8. The upper and lower edges of the mating surface of the locking block 5 and the central tube 8 are guide surfaces. The connecting ring 3 covers the locking block 5, restricting the locking block 5 from coming out of the mating surface of the central tube 8.

[0078] Specifically, the upper connector 1 has a threaded hole on its vertical wall, and a release scissor 2 is installed in the threaded hole. The release scissor 2 is embedded in the central tube 8. The lower part of the upper connector 1 is connected to the connecting ring 3 by a thread.

[0079] Specifically, a locking block retaining ring 4 is provided between the connecting ring 3 and the locking retaining ring 6. The connecting ring 3 and the locking block retaining ring 4 are slidably engaged. The locking block 5 has a stepped structure with a small diameter portion and a large diameter portion. The small diameter portion of the locking block 5 passes through the locking block retaining ring 4, and the large diameter portion engages with the central tube 8. The locking block retaining ring 4 can stop the large diameter portion. The locking block retaining ring 4 is used to prevent the locking block 5 from coming out as a whole when the locking block 5 is disengaged from the central tube 8.

[0080] The locking block 5 and the locking block retaining ring 4 are connected by threads. The locking block retaining ring 4 extends the distance that the connecting ring 3 restricts the locking block 5 from disengaging, thus preventing accidental disengagement.

[0081] Specifically, the mating surface is a trapezoidal surface, with both the upper and lower edges being tapered guide surfaces.

[0082] Specifically, the outer wall of the central tube 8 is provided with an annular groove for positioning the unsealing shear pin, which is used to cooperate with the unsealing shear pin 2, and the outer wall of the central tube 8 is provided with a trapezoidal groove for positioning the locking block, which is used to cooperate with the locking block 5.

[0083] Specifically, the upper connector 1 and the central tube 8 are sealed by a sealing ring groove and a sealing ring.

[0084] Example 3:

[0085] Based on Example 2, this example provides a method for using a mechanically amplified compression type electrically controlled packer, including the following steps:

[0086] S1. During the setting process, the control system issues a forward rotation command to the motor. The DC high-temperature reducer 32 outputs torque to drive the screw transmission assembly. Under the combined action of the force transmission nut 24, lead screw 20, guide screw 18, and guide screw guide groove 8-2, an upward thrust and linear motion are generated. The thrust and linear motion are transmitted to the power rack 15. Through the meshing of the power rack 15 and the transmission gear 13-3, and the meshing of the transmission gear 13-3 and the fixed rack 11, the transmission gear 13-3 is pushed to roll upward. Under the cooperation of the gear frame 13-1 and the transmission gear assembly guide groove 8-1, the gear frame 13-1 is driven to move linearly upward, generating a multiplied thrust. This thrust is used to compress the rubber cylinder 7 for setting through the force transmission inner tube 12, force transmission screw 10, and force transmission pressure ring 9.

[0087] S2. When unsealing, the control system issues a motor reversal command, and the DC high-temperature reducer 32 outputs torque to drive the screw transmission assembly to form a downward pulling force, which is transmitted to the power rack 15. Through the meshing of the power rack 15 and the transmission gear 13-3, and the meshing of the transmission gear 13-3 and the fixed rack 11, the transmission gear 13-3 is pulled to roll downward, and the gear frame 13-1 moves downward in a straight line, thereby driving the force transmission inner tube 12, the force transmission screw 10 and the force transmission pressure ring 9 to move downward, and the elasticity of the rubber sleeve 7 is released, realizing the unsealing of the packer.

[0088] S3. When a malfunction occurs and the electrical unsealing cannot be controlled, the upper connector 1 is lifted to cut the unsealing shear 2. The upper connector 1 drives the connecting ring 3 to move upward, thereby releasing the locking block 5. The locking retaining ring 6 and the central tube 8 can slide against each other. Under the action of the elastic force of the rubber tube 7, the rubber tube 7 rebounds and releases, realizing the unsealing of the packer.

[0089] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0090] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0091] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0092] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mechanically amplified compression type electrically controlled packer, comprising a central tube, characterized in that, The central tube is fitted with a locking ring, a rubber sleeve, and an electric seat-sealing and unsealing mechanism from top to bottom; The electric sealing and unsealing mechanism includes a linear driver and a rack and pinion auxiliary force amplification component. The output end of the linear driver is connected to the input end of the rack and pinion auxiliary force amplification component, and the output end of the rack and pinion auxiliary force amplification component is in contact with the rubber cylinder.

2. The mechanically amplified compression type electrically controlled packer according to claim 1, characterized in that, The gear and rack auxiliary force amplification component includes a fixed rack, a transmission gear assembly, a power rack, a force transmission inner tube, and a force transmission pressure ring. The fixed rack is installed in the inner hole of the outer support cylinder, and the outer support cylinder is a fixed component; The central tube is provided with a guide groove for the transmission gear assembly. The transmission gear assembly is located in the guide groove for the transmission gear assembly. The transmission gear assembly includes a gear carrier, a gear shaft, and a transmission gear. The transmission gear is rotatably mounted inside the gear carrier via the gear shaft. The lower end of the power rack is connected to the output end of the linear actuator; The transmission gears mesh with the fixed rack and the power rack respectively; the force transmission pressure ring is sleeved outside the central tube, the force transmission pressure ring is located below the rubber cylinder, and the force transmission pressure ring is in contact with the rubber cylinder; the upper end of the force transmission inner tube is connected to the force transmission pressure ring, and the lower end of the force transmission inner tube is connected to the gear frame.

3. The mechanically amplified compression type electrically controlled packer according to claim 2, characterized in that, The lower end of the supporting outer cylinder is connected to the outer cylinder, and the lower end of the outer cylinder is connected to the outer wall of the lower connector.

4. A mechanically amplified compression type electrically controlled packer according to claim 2, characterized in that, The gear frame is configured as a rectangular structure, and a rectangular through hole of the same size as the gear frame is provided on the lower end vertical wall of the force transmission inner tube. The gear frame is installed in the rectangular through hole at the lower end of the force transmission inner tube.

5. A mechanically amplified compression type electrically controlled packer according to claim 3, characterized in that, The linear actuator includes a motor and a screw drive assembly, the screw drive assembly including a force transmission joint, a lead screw, a force transmission nut, and a force transmission sleeve; The lower end of the lead screw is connected to the output shaft of the motor, the lead screw is threaded with a force transmission nut, the outer wall of the force transmission nut is fixedly connected with a force transmission sleeve, the upper end of the force transmission sleeve is connected to a force transmission connector, and the upper end of the force transmission connector is connected to a power rack. The central tube is provided with a guide screw groove along the axial direction, and the outer wall of the force transmission joint is connected to a guide screw. The guide screw extends into the guide screw groove and slides up and down along the guide screw groove.

6. A mechanically amplified compression type electrically controlled packer according to claim 5, characterized in that, It also includes a rotation stabilizing component, which includes a motor bearing housing, a first convex ring disposed in the inner hole of the motor bearing housing, a combined bearing disposed above the first convex ring, and the lead screw passing through the combined bearing; The lower end of the motor bearing housing is connected to the motor connecting plate, the motor connecting plate is connected to the motor, and the output shaft of the motor is connected to the lead screw; The upper end of the outer wall of the motor bearing housing is connected to the transmission sealing outer cylinder, the upper end of the transmission sealing outer cylinder is connected to the central tube, the lower end of the outer wall of the motor bearing housing is connected to the motor outer cylinder, and a sealing plug is provided on the inner wall of the motor outer cylinder below the motor.

7. A mechanically amplified compression type electrically controlled packer according to claim 6, characterized in that, The lower end of the outer cylinder of the motor is connected to the inner tube. A sealing step is provided on the inner wall of the outer cylinder of the motor. The inner tube presses the sealing plug tightly against the sealing step. The lower end of the inner tube is connected to the inner wall of the lower connector.

8. A mechanically amplified compression type electrically controlled packer according to claim 7, characterized in that, The sealing plug is provided with a cable connector hole for connecting a cable connector, and the inner tube has a flow hole on its vertical wall for the cable to pass through.

9. A mechanically amplified compression type electrically controlled packer according to any one of claims 1-8, characterized in that, The central tube is fitted with an upward lifting and unsealing component, which is located above the locking ring. The upward lifting and unsealing component includes an upper connector, a connecting ring, and a locking block. The upper connector, connecting ring, and locking retaining ring are slidably sleeved on the outer wall of the central tube; The upper connector is connected to the central tube via a release shear pin. The lower end of the upper connector is connected to a connecting ring. The connecting ring is sleeved outside the locking retaining ring. The locking retaining ring is connected to the central tube via a locking block. The locking block passes through the locking retaining ring and is embedded in the central tube. The upper and lower edges of the mating surface between the locking block and the central tube are guide surfaces. The connecting ring covers the locking block and restricts the locking block from coming out of the central tube.

10. A method of using a mechanically amplified compression type electrically controlled packer, characterized in that, Includes the following steps: During setting, the linear actuator outputs thrust, which, through the meshing of the power rack and the transmission gear, and the meshing of the transmission gear and the fixed rack, pushes the transmission gear to roll upward. With the cooperation of the gear carrier and the guide groove of the transmission gear assembly, the gear carrier moves linearly upward. The gear carrier pushes the force transmission inner tube and the force transmission pressure ring, and the force transmission pressure ring compresses the rubber cylinder to achieve setting. When the packer is unsealed, the linear actuator outputs a pulling force, the power rack moves downward, the transmission gear rolls downward, and drives the gear carrier to move linearly downward, thereby driving the force transmission inner tube and the force transmission pressure ring to move downward, releasing the elasticity of the rubber sleeve and realizing the unsealing of the packer.

Images