Hydraulic setting and electric unsetting packer

Abstract

This utility model discloses a hydraulically set and electrically controlled release packer, comprising an inner central tube and an outer central tube. A linear cylinder and a pusher tube are slidably arranged within the annulus between the inner and outer central tubes. A sealing ring is provided at the lower end of the annulus, and an electric drive mechanism for moving the linear cylinder downwards is provided at the upper end of the annulus. A rubber sleeve assembly is sleeved on the outside of the outer central tube, with its upper end fixed. The outer central tube has an elongated hole corresponding to the pusher tube. A pressure relief component is provided, slidingly passing through the lower end of the rubber sleeve assembly and through the elongated hole to connect with the pusher tube. A force transmission component is provided, passing through the elongated hole and connecting to the lower end of the rubber sleeve assembly, and is located below the pusher tube. Between the linear cylinder and the pusher tube, the inner central tube has an injection hole, and the outer central tube has a liquid inlet hole. The rubber sleeve assembly seals against the outer wall of the outer central tube above and below the liquid inlet hole. This utility model fully combines the advantages of downhole electric drive and hydraulic drive in oil and water wells, improving the reliability of interlayer isolation in the layered tubing string.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically a hydraulic setting and electrically controlled unsealing packer. Background Technology

[0002] As oilfield development enters its mid-to-late stages, inter-layer heterogeneity becomes increasingly severe, necessitating stratified extraction with real-time dynamic adjustments to further enhance oil recovery. Furthermore, with the rapid development of digitalization and intelligentization in oilfields, intelligent stratified oil production technology will inevitably become the future trend. Currently, there are two main types of intelligent stratified oil production technology: cabled intelligent stratified oil production technology and cableless intelligent stratified oil production technology. For stratified packing, conventional compression packers or electric packers are generally used. Conventional packers require the assistance of other equipment, such as tank trucks or pump trucks, for pressurization during setting. Electric packers do not require other equipment and have a fast response, but they suffer from insufficient motor drive power and small setting pressure differentials. Hydraulically controlled packers are commonly used offshore, offering advantages such as simple structure and real-time monitoring of packer status and dynamic pressure replenishment. However, during unsealing, they need to overcome hydraulic friction within the tubing from the well to the surface, resulting in a slow unsealing speed.

[0003] Publication No. CN105221098B discloses an electric packer, including a housing, a control mechanism, an actuator, a limiting mechanism, a setting mechanism, and an lifting and unsealing mechanism. The housing is composed of a lower connector, a lower shell, a mounting base, and an upper shell connected together. The control mechanism is located inside the housing. The actuator is located inside the housing and is an actuator motor, which is connected to a circuit board. The limiting mechanism is located inside the housing and connected to the actuator. The setting mechanism is located inside the housing and connected to the limiting mechanism. The lifting and unsealing mechanism is located inside the housing and connected to the setting mechanism.

[0004] This is a device that uses a motor to drive a piston, causing hydraulic oil in the hydraulic chamber to enter the setting piston and compress the rubber sleeve to achieve setting. The motor then reverses to release the oil pressure, and the setting piston resets under the action of negative pressure and the restoring deformation force of the rubber sleeve. The lifting release mechanism then continues to complete the release of the electric packer.

[0005] 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, a plunger pump, and a guide sleeve are sequentially mounted around its circumference. The end of the guide sleeve near the motor extends into the interior of the plunger pump. A thrust piston that can move up and down is provided around the circumference of the guide sleeve inside the plunger pump. A fixed sleeve that works in conjunction with the guide sleeve is provided around its circumference at the end away from the motor. A blocking body protruding from the cylinder is provided at the end of the fixed sleeve away from the guide sleeve. At least one rubber sleeve is mounted around the circumference of the fixed sleeve between the blocking body and the plunger pump. A top sleeve is provided between the rubber sleeve and the thrust piston. One end of the top sleeve is mounted around the circumference of the guide sleeve and connected to the thrust piston, and the other end of the top sleeve is mounted around the circumference of the fixed sleeve between the rubber sleeve and the thrust piston.

[0006] This is a scheme where a motor-driven plunger pump draws hydraulic oil from the oil tank to set the seal, and the motor reverses to drive the plunger pump to return the hydraulic oil to the oil tank through another oil circuit to achieve unsealing.

[0007] Publication No. CN208106377U discloses an electric packer, including an upper connector and an outer air chamber fixed to the upper connector. A main spindle is fixedly connected to the inner wall of the outer air chamber. A differential pressure spindle, an upper gauge, a rubber sleeve, and a spacer ring are sequentially sleeved on the main spindle. A lower connector is fixedly connected to the lower end of the main spindle. The differential pressure spindle is in sealing contact with the inner wall of the outer air chamber. The differential pressure spindle is also sleeved with a connecting connector fixedly connected to the outer air chamber. The left and right ends of the differential pressure spindle are respectively provided with a setting cavity and a releasing cavity. The upper gauge is sleeved on the connecting connector and fixedly connected to the differential pressure spindle. It also includes a setting flow channel and a releasing flow channel. The setting flow channel and the releasing flow channel pass through the upper connector and the outer air chamber in sequence to the setting cavity and the releasing cavity, respectively. A setting electric push rod and a releasing electric push rod are installed in the upper connector, respectively extending into the setting flow channel and the releasing flow channel.

[0008] This is a device where an electric actuator opens the inlet, relying on the pressure difference of the annular liquid entering the slender cavity to set the packer. Another electric actuator opens the outlet, allowing liquid to enter the large cavity and reduce the pressure difference to release the packer.

[0009] As mentioned above, existing electric packers mainly use a motor-driven plunger pump mechanism to draw hydraulic oil or annular fluid from the pre-formed oil chamber into the rubber sleeve. Pressurization causes the rubber sleeve to expand and achieve setting. Depressurization is then achieved by reversing the flow, thus releasing the rubber sleeve. These solutions still suffer from slow release after the oil pressure inside the rubber sleeve is released, relying on the sleeve's self-elasticity to recover. Furthermore, the rubber sleeve may become difficult to release after aging to a certain extent. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a hydraulic setting and electrically controlled unsealing packer.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A hydraulically set and electrically controlled release packer includes an inner central tube and an outer central tube. A linear cylinder and a push tube are slidably arranged within an annular space between the inner and outer central tubes. A sealing ring is provided at the lower end of the annular space, and an electric drive mechanism for moving the linear cylinder downwards is provided at the upper end of the annular space. A rubber sleeve assembly is sleeved on the outside of the outer central tube, with its upper end fixed. The outer central tube has an elongated hole corresponding to the push tube. A pressure relief component is provided, which slidably passes through the lower end of the rubber sleeve assembly and through the elongated hole to connect with the push tube. A force transmission component passes through the elongated hole and connects to the lower end of the rubber sleeve assembly, located below the push tube. Between the linear cylinder and the push tube, the inner central tube has an injection hole, and the outer central tube has a liquid inlet hole. The rubber sleeve assembly is sealed to the outer wall of the outer central tube above and below the liquid inlet hole.

[0013] Furthermore, the pressure relief component is a pressure relief nail, the force transmission component is a release pin, and the elongated hole includes an axial pressure relief elongated hole and a release elongated hole;

[0014] Specifically, one end of the pressure relief nail is provided with a threaded post that is threaded to the push tube, and the outer wall of the end of the pressure relief nail away from the threaded post is provided with a first sealing groove. The first sealing groove is provided with a first sealing ring that seals with the rubber sleeve assembly.

[0015] Specifically, one end of the unsealing pin is provided with a cylindrical rod extending to the bottom of the push tube, and the end of the unsealing pin away from the cylindrical rod is provided with a threaded connecting ring that is threadedly connected to the rubber sleeve assembly. The unsealing pin is provided with a sealing ring at the end of the threaded connecting ring away from the cylindrical rod. The outer wall of the sealing ring is provided with a second sealing groove, and a second sealing ring is provided in the second sealing groove to seal with the rubber sleeve assembly.

[0016] Furthermore, it also includes an electrically controlled cavity ring, wherein an inner ring and an outer ring are provided at the lower end of the electrically controlled cavity ring, the inner ring is connected to a central tube, an electric drive mechanism is provided between the inner ring and the outer ring, and the lower end of the outer ring is connected to a rubber sleeve assembly;

[0017] Specifically, the electric drive mechanism includes a hollow motor, the inner wall of the inner ring is connected to the outer wall of the inner central tube, the mover of the hollow motor extends out of the inner ring, the upper end of the linear cylinder is located between the mover and the inner central tube, the lower end of the mover is fixedly provided with a connecting sleeve, the inner wall of the connecting sleeve and the outer wall of the linear cylinder are in clearance fit through a transmission thread pair, and the inner wall of the linear cylinder and the outer wall of the inner central tube are connected through a linear guide mechanism.

[0018] Furthermore, the rubber sleeve assembly includes an upper pressing connector, an expanded rubber sleeve, and a lower pressing connector;

[0019] Specifically, the upper pressing connector is connected to the upper end of the expansion tube, the upper end of the outer wall of the upper pressing connector is connected to the inner wall of the lower end of the outer ring, and the inner wall of the upper pressing connector is sealed to the outer wall of the outer central tube.

[0020] Specifically, the lower pressing connector is connected to the lower end of the expansion tube; the pressure relief pin and the unsealing pin are disposed on the lower pressing connector, and the inner wall of the lower pressing connector is sealed to the outer wall of the outer central tube below the pressure relief pin and the unsealing pin.

[0021] Furthermore, the liquid inlet and the injection hole are located on the same radial horizontal plane; the pressure relief orifice and the unsealing orifice are of the same length.

[0022] Furthermore, the linear guiding mechanism includes a guide keyway and a guide key;

[0023] Specifically, a guide keyway is provided on the inner wall of the linear cylinder, and the upper end of the guide keyway extends to the top surface of the linear cylinder to form an opening;

[0024] Specifically, a guide key is provided on the outer wall of the inner central tube at the same axial position, and the guide key is in clearance fit with the guide keyway.

[0025] Furthermore, the electrical control cavity ring is an upper connector, the inner wall of the inner ring is connected to the outer wall of the upper end of the inner central tube, and the outer wall of the upper connector is provided with a mounting hole that communicates with the equipment annular space between the inner ring and the outer ring. The mounting hole is used to connect the armored cable to provide power lines and control lines for the hollow motor.

[0026] Furthermore, the sealing ring is a lower connector, the upper inner wall of the lower connector is connected to the lower outer wall of the inner central tube, the outer wall of the lower connector is provided with a first positioning protrusion ring, the lower end of the outer central tube sits on the first positioning protrusion ring, and the outer central tube and the lower connector are fastened by fastening nails.

[0027] Furthermore, the upper pressing connector includes an outer upper pressing sleeve and an inner upper pressing sleeve. The inner wall of the upper pressing sleeve is provided with a downward-facing first expansion step. The inner wall of the outer upper pressing sleeve is connected to the outer wall of the inner upper pressing sleeve above the first expansion step. The upper outer wall of the outer upper pressing sleeve is connected to the inner wall of the outer ring. The portion of the outer upper pressing sleeve below the first expansion step and the inner upper pressing sleeve clamp the expansion tube.

[0028] Specifically, the lower pressing connector includes an outer lower pressing sleeve and an inner lower pressing sleeve. The inner wall of the outer lower pressing sleeve is provided with an upward-facing second expansion step. The inner wall of the outer lower pressing sleeve is connected to the outer wall of the inner lower pressing sleeve below the second expansion step. The lower inner wall of the outer lower pressing sleeve is slidably sealed to the outer wall of the outer central tube. The portion of the outer lower pressing sleeve above the second expansion step and the inner lower pressing sleeve clamp an expansion tube.

[0029] Furthermore, an upper bearing is provided between the moving element and the upper end face of the equipment annulus, and a lower bearing is provided between the connecting sleeve and the outer central tube.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. In this utility model, the hydraulic setting seal and the hollow motor assisting in unsealing fully combine the advantages of downhole electric drive and hydraulic drive in oil and water wells, avoid their respective weaknesses, and improve the interlayer isolation reliability of the layered tubing string.

[0032] 2. The combination design of the push tube, pressure relief pin, and unsealing pin in this utility model helps to slow down the expansion speed of the rubber tube and ensure the stability and reliability of the rubber tube setting seal; the design of the push tube and pressure relief pin assists the motor drive to realize the rubber tube unsealing, and the pressure is discharged to the annulus of the oil sleeve, which is not affected by the hydraulic pressure in the tubing string; by driving the linear cylinder to slide axially, the hydraulic channel between the inner cavity of the rubber tube and the inner central tube is opened or closed; the unsealing pin structure design helps the rubber tube to be completely unsealed. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a hydraulic setting and electrically controlled unsealing packer according to the present invention.

[0034] Figure 2 This is a cross-sectional schematic diagram of the straight cylinder in this utility model.

[0035] Figure 3 This is a partial structural schematic diagram of the outer central tube in this utility model.

[0036] Figure 4 This is a structural schematic diagram of the pressure relief nail in this utility model.

[0037] Figure 5 This is a schematic diagram of the unsealing pin in this utility model.

[0038] In the diagram: upper connector 1, mounting hole 101, equipment annulus 1a;

[0039] Moving element 2, upper bearing 201, coil 202, stator 203, connecting convex ring 203a, circuit board 204, connecting sleeve 205, lower bearing 206;

[0040] Inner central tube 3, injection hole 3a, guide key 301, central tube annulus 302;

[0041] Straight cylinder 4, guide keyway 4a, transmission threaded pair 4b, bottom 4c;

[0042] Expanding rubber sleeve 5, outer upper pressure sleeve 501, inner upper pressure sleeve 502, outer lower pressure sleeve 503, pressure relief hole 503a, pin hole 503b, inner lower pressure sleeve 504, unsealing pin 505, second sealing groove 505a, threaded connecting ring 505b, cylindrical rod 505c.

[0043] 6. Outer central tube; 6a. Restriction step; 6b. Liquid inlet; 6c. Pressure relief long hole; 6d. Unsealing long hole;

[0044] Push tube 7, pressure relief pin 701, first sealing groove 701a, threaded post 701b;

[0045] Lower connector 8, fastening screw 801. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0047] Example 1:

[0048] Please see Figures 1 to 5 This utility model provides a hydraulically set-and-open packer with electrical control, comprising an inner central tube 3, an outer central tube 6, and an electrical control cavity ring. The lower end of the electrical control cavity ring has an inner ring and an outer ring. The inner ring is connected to the central tube 3. An electric drive mechanism is provided between the inner and outer rings. A linear cylinder 4 and a push tube 7 are slidably arranged between the inner central tube 3 and the outer central tube 6. A sealing ring is provided at the lower end of the inner central tube 3 and the outer central tube 6. The electric drive mechanism enables the linear cylinder 4 to move downwards. The lower end of the outer ring is connected to a rubber sleeve assembly. The outer central tube 6 has an elongated hole corresponding to the push tube 7. A pressure relief component is provided, slidingly passing through the lower end of the rubber sleeve assembly, through the elongated hole, and connected to the push tube 7. A force transmission component passes through the elongated hole and is connected to the lower end of the rubber sleeve assembly. The force transmission component is located below the push tube 7. The inner central tube 3 has an injection hole 3a between the linear cylinder 4 and the push tube 7. The outer central tube 6 has a liquid inlet between the linear cylinder 4 and the push tube 7. Hole 6b, the rubber sleeve assembly is sealed above and below the liquid inlet hole 6b to the outer wall of the outer central tube 6; when water is injected, the liquid passes through the injection hole 3a and the liquid inlet hole 6b, causing the expansion tube 5 of the rubber sleeve assembly to expand outward, the rubber sleeve assembly to contract axially, the disconnectable connector moves upward along the long hole, the push tube 7 moves upward, the push tube 7 is affected by the pressure of the central tube annulus 302 between the inner central tube 3 and the outer central tube 6, the push tube 7 moves upward slowly, causing the expansion tube 5 to expand outward slowly, achieving full sealing, and finally the push tube 7 blocks the injection hole 3a; when rapid unsealing is required, the electric drive mechanism drives the linear cylinder 4 to move downward, pushing the push tube 7 downward, shearing the pressure relief component, the pressure relief component slides out of the rubber sleeve assembly, the rubber sleeve assembly is rapidly depressurized, at the same time, the push tube 7 moves downward to push the force transmission component, the lower end of the rubber sleeve assembly is subjected to force and falls rapidly, so that the rubber sleeve assembly is rapidly unsealed, and at the same time the linear cylinder 4 blocks the liquid inlet hole 6b, isolating the inner cavity of the expansion tube 5 from the inner cavity of the inner central tube 3.

[0049] Specifically, the liquid inlet hole 6b and the injection hole 3a are located on the same radial horizontal plane.

[0050] Specifically, the linear cylinder 4 is sealed with both the inner central tube 3 and the outer central tube 6 by sealing rings to prevent liquid from entering the electric drive mechanism; the outer central tube 6 is provided with a sealing ring below the liquid inlet hole 6b to cooperate with the linear cylinder 4 to seal the liquid inlet hole 6b, so that the communication between the inner cavity of the expansion tube 5 and the inner cavity of the inner central tube 3 is only a gap.

[0051] Further, the pressure relief component is a pressure relief pin 701, the force transmission component is a release pin 505, the elongated hole includes an axial pressure relief elongated hole 6c and a release elongated hole 6d, one end of the pressure relief pin 701 is provided with a threaded post 701b and threadedly connected to the push tube 7, the outer wall of the end of the pressure relief pin 701 away from the threaded post 701b is provided with a first sealing groove 701a, the first sealing groove 701a is provided with a first sealing ring and seals with the rubber sleeve assembly; one end of the release pin 505 is provided with a cylindrical rod 505c extending to the bottom of the push tube 7, the end of the release pin 505 away from the cylindrical rod 505c is provided with a threaded connecting ring 505b and threadedly connected to the rubber sleeve assembly, the end of the release pin 505 away from the cylindrical rod 505c is provided with a sealing ring, the outer wall of the sealing ring is provided with a second sealing groove 505a, the second sealing groove 505a is provided with a second sealing ring and seals with the rubber sleeve assembly.

[0052] Specifically, the pressure relief long hole 6c and the unsealing long hole 6d are of the same length. In the initial state, the pressure relief nail 701 is located at the lower end of the pressure relief long hole 6c, and the unsealing pin 505 is located at the lower end of the unsealing long hole 6d.

[0053] Furthermore, the electric drive mechanism includes a hollow motor, the inner wall of the inner ring is connected to the outer wall of the inner central tube 3, the mover 2 of the hollow motor extends out of the inner ring, the upper end of the linear cylinder 4 is located between the mover 2 and the inner central tube 3, the lower end of the mover 2 is fastened with a connecting sleeve 205 by a thread, the inner wall of the connecting sleeve 205 and the outer wall of the linear cylinder 4 are clearance-fitted by a transmission thread pair 4b, and the inner wall of the linear cylinder 4 is connected to the outer wall of the inner central tube 3 by a linear guide mechanism.

[0054] Specifically, the linear guide mechanism includes a guide keyway 4a and a guide key 301. The guide keyway 4a is provided on the inner wall of the linear cylinder 4. The upper end of the guide keyway 4a extends to the top surface of the linear cylinder 4 to form an opening for easy assembly. Two guide keys 301 are provided on the outer wall of the inner central tube 3 at the same axial position. The guide key 301 is in clearance fit with the guide keyway 4a. In the initial state, the guide key 301 located below is in contact with the lower bottom 4c of the guide keyway 4a.

[0055] Specifically, the inner wall of the outer central tube 6 is provided with an upward limiting step 6a above the liquid inlet 6b, and the outer wall of the linear cylinder 4 is provided with a downward limiting step. The limiting step can sit on the limiting step 6a to achieve the downward limit positioning of the linear cylinder 4.

[0056] Specifically, the hollow motor includes a mover 2, a stator 203, and a circuit board 204. The mover 2, stator 203, and circuit board 204 are arranged in a loop from the inside to the outside between the inner and outer rings. The stator 203 is wound with a coil 202, and the circuit board 204 controls the operation of the hollow motor.

[0057] Specifically, the outer wall of the stator 203 is provided with a connecting protrusion ring 203a, the outer wall of the connecting protrusion ring 203a is threadedly connected to the inner wall of the outer ring, and the upper end of the connecting protrusion ring 203a abuts against the sealed circuit board 204.

[0058] Specifically, the electrical control cavity ring is an upper connector 1. The inner wall of the inner ring is threaded to the outer wall of the upper end of the inner central tube 3 and is sealed by a sealing ring and positioned by a step. The outer wall of the upper connector 1 is provided with a mounting hole 101 that communicates with the equipment annular space 1a between the inner ring and the outer ring. The mounting hole 101 is used to connect the armored cable and provide power lines and control lines for the circuit board 204.

[0059] Specifically, the sealing ring is a lower connector 8. The upper inner wall of the lower connector 8 is threadedly connected to the lower outer wall of the inner central tube 3, and is sealed by a sealing ring and positioned by a step. A first positioning protrusion is provided on the outer wall of the lower connector 8. The lower end of the outer central tube 6 sits on the first positioning protrusion. The outer central tube 6 and the lower connector 8 are fastened to prevent rotation by radial fastening nails 801 and sealed by a sealing ring.

[0060] Furthermore, the rubber sleeve assembly includes an upper pressing connector, an expanding rubber sleeve 5, and a lower pressing connector. The upper pressing connector is connected to the upper end of the expanding rubber sleeve 5. The upper end of the outer wall of the upper pressing connector is threaded to the inner wall of the lower end of the outer ring. The inner wall of the upper pressing connector is sealed to the outer wall of the outer central tube 6. The lower pressing connector is connected to the lower end of the expanding rubber sleeve 5. The pressure relief pin 701 and the unsealing pin 505 are disposed on the lower pressing connector. The inner wall of the lower pressing connector is sealed to the outer wall of the outer central tube 6 below the pressure relief pin 701 and the unsealing pin 505.

[0061] Specifically, the upper pressing connector includes an outer upper pressing sleeve 501 and an inner upper pressing sleeve 502. The inner wall of the outer upper pressing sleeve 501 is provided with a downward-facing first expansion step. The inner wall of the outer upper pressing sleeve 501 is threadedly connected to the outer wall of the inner upper pressing sleeve 502 above the first expansion step. The upper outer wall of the outer upper pressing sleeve 501 is threadedly connected to the inner wall of the outer ring and sealed by a sealing ring. The portion of the outer upper pressing sleeve 501 below the first expansion step is clamped between the outer upper pressing sleeve 501 and the inner upper pressing sleeve 502, holding the expansion solidified on the outer cylindrical surface of the inner upper pressing sleeve 502. The rubber sleeve 5; the lower pressing connector includes an outer lower pressing sleeve 503 and an inner lower pressing sleeve 504. The inner wall of the outer lower pressing sleeve 503 is provided with an upward-facing second expansion step. The inner wall of the outer lower pressing sleeve 503 is threadedly connected to the outer wall of the inner lower pressing sleeve 504 below the second expansion step. The lower inner wall of the outer lower pressing sleeve 503 is slidably sealed to the outer wall of the outer central tube by a sealing ring. The portion of the outer lower pressing sleeve 503 above the second expansion step and the inner lower pressing sleeve 504 clamp the expansion rubber sleeve 5, which is solidified on the outer cylindrical surface of the inner lower pressing sleeve 504.

[0062] Specifically, the outer lower pressure sleeve 503 is provided with a pressure relief hole 503a and a pin hole 503b below the inner lower pressure sleeve 504; a pressure relief pin 701 is sealed and inserted into the pressure relief hole 503a, and the threaded post 701b of the pressure relief pin 701 passes through the pressure relief elongated hole 6c of the outer central tube 6 and is threadedly connected to the push tube 7; the pin hole 503b is sealed and installed and connected to the threaded connecting ring 505b of the unsealing pin 505 through the thread; the cylindrical rod 505c of the unsealing pin 505 passes through the axial unsealing elongated hole 6d of the outer central tube 6, reaches the annular space 302 between the inner central tube 3 and the outer central tube 6, and is located below the lower end face of the push tube 7.

[0063] Specifically, a second positioning protrusion is provided on the lower outer wall of the outer central tube 6, and the lower end of the outer central tube 6 abuts against the upper surface of the second positioning protrusion.

[0064] Specifically, an upper bearing 201 is provided between the mover 2 and the upper end face of the equipment annulus 1a, and a lower bearing 206 is provided between the connecting sleeve 205 and the outer central tube 6. The upper bearing 201 and the lower bearing 206 are axial bearings, such as thrust bearings and tapered roller bearings, used to realize the axial positioning and rotational connection of the mover 2.

[0065] Example 2:

[0066] Based on Example 1, this example provides a method for using a hydraulically set and electrically controlled release packer, including the following steps:

[0067] First, the packer is connected to the layered tubing string and lowered into the target layer of the oil / water well. The straight tube 4 is in its initial installation position, with its lower end above the injection port 3a of the inner central tube 3. Fluid is injected into the tubing string, and the fluid enters the annulus 302 of the central tube through the injection port 3a, and then enters the inner cavity of the expansion sleeve 5 through the inlet port 6b. Under pressure, the expansion sleeve 5 deforms outward. Since the outer upper pressure sleeve 501 is fixed to the upper connector 1, and the outer lower pressure sleeve 503 is movably and sealingly fitted onto the outer central tube 6, during the outward expansion of the expansion sleeve 5... In the middle, the outer lower pressure sleeve 503 moves upward, along with the unsealing pin 505 and the pressure relief pin 701, pushing the push tube 7 upward. The upper end of the push tube 7 and the lower end of the straight cylinder 4 are filled with fluid, which creates a certain pressure difference, slowing down the expansion speed of the expansion sleeve 5. This prevents the expansion sleeve 5 from being set too quickly due to the high pressure inside the tubing, resulting in poor expansion and sealing effect. After the tubing maintains the pressure for a certain period of time, the expansion sleeve 5 continues to expand slowly, achieving an annular separation seal between the oil sleeve and the tubing.

[0068] When a hydraulically set and electrically controlled release packer needs to be released, the ground-driven hollow motor rotates, and the mover 2 drives the connecting sleeve 205 to rotate. The rotating connecting sleeve 205 causes the linear cylinder 4 to move downward along the axis, pushing the push tube 7 downward. When the pressure relief pin 701 moves to the lower end of the pressure relief long hole 6c, the push tube 7 continues to move downward, shearing the pressure relief pin 701, or pushing the push tube 7 downward. The expansion sleeve 5 is tightly connected to the sleeve, preventing the pressure relief pin 701 from moving downward, thus shearing the pressure relief pin 701. Under the pressure of the expansion sleeve 5's inner cavity, the pressure relief pin 701 disengages from the pressure relief hole 503a, opening the pressure relief hole 503a. The inner cavity of the expansion sleeve 5 is quickly depressurized, and the push tube 7 continues to move downward, pushing the release pin 505. The release pin 505 pulls down the outer pressure sleeve 503, causing the expansion sleeve 5 to quickly return to its original state, ultimately achieving complete release of the packer.

[0069] 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.

[0070] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" 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 utility model according to the specific circumstances.

[0071] In the description of this utility model, 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 utility model 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 utility model.

[0072] 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.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulic set and electrically unsetting packer comprising an inner central tube, an outer central tube, characterized in that, A linear cylinder and a pusher are slidably arranged in the annular space between the inner and outer central tubes. A sealing ring is provided at the lower end of the annular space, and an electric drive mechanism for moving the linear cylinder downwards is provided at the upper end of the annular space. A rubber sleeve assembly is fitted around the outer central tube. The upper end of the rubber sleeve assembly is fixed. The outer central tube is provided with an elongated hole corresponding to the push tube. A pressure relief component is provided to slide through the lower end of the rubber sleeve assembly, through the elongated hole, and connect to the push tube. A force transmission component is provided to pass through the elongated hole and connect to the lower end of the rubber sleeve assembly. The force transmission component is located below the push tube. Between the linear cylinder and the push tube, the inner central tube is provided with an injection hole, and the outer central tube is provided with a liquid inlet hole; the rubber sleeve assembly is sealed above and below the liquid inlet hole and to the outer wall of the outer central tube.

2. The hydraulic set and electrically released packer of claim 1, wherein, The pressure relief component is a pressure relief nail, the force transmission component is a release pin, and the elongated hole includes an axial pressure relief elongated hole and a release elongated hole; One end of the pressure relief nail is provided with a threaded post that is threaded to the push tube. The outer wall of the end of the pressure relief nail away from the threaded post is provided with a first sealing groove. The first sealing groove is provided with a first sealing ring that seals with the rubber sleeve assembly. One end of the unsealing pin is provided with a cylindrical rod extending to the bottom of the push tube. The end of the unsealing pin away from the cylindrical rod is provided with a threaded connecting ring that is threadedly connected to the rubber sleeve assembly. The unsealing pin is provided with a sealing ring at the end of the threaded connecting ring away from the cylindrical rod. The outer wall of the sealing ring is provided with a second sealing groove. A second sealing ring is provided in the second sealing groove to seal with the rubber sleeve assembly.

3. The hydraulic setting and electrically controlled unsealing packer according to claim 2, characterized in that, It also includes an electrically controlled cavity ring, with an inner ring and an outer ring at the lower end of the electrically controlled cavity ring. The inner ring is connected to a central tube, and an electric drive mechanism is provided between the inner ring and the outer ring. The lower end of the outer ring is connected to a rubber sleeve assembly. The electric drive mechanism includes a hollow motor. The inner wall of the inner ring is connected to the outer wall of the inner central tube. The mover of the hollow motor extends out of the inner ring. The upper end of the linear cylinder is located between the mover and the inner central tube. A connecting sleeve is fixedly installed at the lower end of the mover. The inner wall of the connecting sleeve and the outer wall of the linear cylinder are in clearance fit through a transmission thread pair. The inner wall of the linear cylinder and the outer wall of the inner central tube are connected through a linear guide mechanism.

4. A hydraulically set and electrically controlled release packer according to claim 3, characterized in that, The rubber tube assembly includes an upper pressing connector, an expanded rubber tube, and a lower pressing connector; The upper pressing connector is connected to the upper end of the expansion tube, the upper end of the outer wall of the upper pressing connector is connected to the inner wall of the lower end of the outer ring, and the inner wall of the upper pressing connector is sealed to the outer wall of the outer central tube. The lower pressing connector is connected to the lower end of the expansion tube; the pressure relief pin and the unsealing pin are arranged in the lower pressing connector, and the inner wall of the lower pressing connector is sealed to the outer wall of the outer central tube below the pressure relief pin and the unsealing pin.

5. A hydraulically set and electrically controlled release packer according to claim 3, characterized in that, The liquid inlet and injection hole are located on the same radial horizontal plane; the pressure relief orifice and the unsealing orifice are of the same length.

6. A hydraulically set and electrically controlled release packer according to claim 3, characterized in that, The linear guide mechanism includes a guide keyway and a guide key; The inner wall of the linear cylinder is provided with a guide keyway, the upper end of which extends to the top surface of the linear cylinder to form an opening; A guide key is provided on the outer wall of the inner central tube at the same axial position, and the guide key is in clearance fit with the guide keyway.

7. A hydraulically set and electrically controlled release packer according to claim 3, characterized in that, The electrical control cavity ring is an upper connector. The inner wall of the inner ring is connected to the outer wall of the upper end of the inner central tube. The outer wall of the upper connector is provided with a mounting hole that communicates with the equipment annular space between the inner ring and the outer ring. The mounting hole is used to connect the armored cable to provide power lines and control lines for the hollow motor.

8. A hydraulically set and electrically controlled release packer according to claim 1, characterized in that, The sealing ring is a lower connector. The inner wall of the upper end of the lower connector is connected to the outer wall of the lower end of the inner central tube. A first positioning protrusion is provided on the outer wall of the lower connector. The lower end of the outer central tube sits on the first positioning protrusion. The outer central tube and the lower connector are fastened by fastening screws.

9. A hydraulically set and electrically controlled release packer according to claim 4, characterized in that, The upper pressing connector includes an outer upper pressing sleeve and an inner upper pressing sleeve. The inner wall of the upper pressing sleeve is provided with a downward-facing first expansion step. The inner wall of the outer upper pressing sleeve is connected to the outer wall of the inner upper pressing sleeve above the first expansion step. The upper outer wall of the outer upper pressing sleeve is connected to the inner wall of the outer ring. The portion of the outer upper pressing sleeve below the first expansion step and the inner upper pressing sleeve clamp the expansion tube. The lower pressing connector includes an outer lower pressing sleeve and an inner lower pressing sleeve. The inner wall of the outer lower pressing sleeve is provided with an upward-facing second expansion step. The inner wall of the outer lower pressing sleeve is connected to the outer wall of the inner lower pressing sleeve below the second expansion step. The lower inner wall of the outer lower pressing sleeve slides and seals with the outer wall of the outer central tube. The portion of the outer lower pressing sleeve above the second expansion step and the inner lower pressing sleeve clamp an expansion tube.

10. A hydraulically set and electrically controlled release packer according to claim 9, characterized in that, An upper bearing is provided between the moving part and the upper end face of the equipment annulus, and a lower bearing is provided between the connecting sleeve and the outer central tube.

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