Sub-control type electric layered water injection packer

Abstract

The invention provides a sub-control type electric layered water injection packer which comprises a center pipe, an elastic rubber sleeve arranged on the center pipe in a sleeving mode, a motor base arranged at one end of the center pipe and provided with a center hole, a motor arranged on the motor base, a sealing head and a transmission assembly in transmission connection with the motor and the sealing head. A motor base is arranged in the center pipe, a fluid channel communicating with the center hole and an annular space between the center pipe and the rubber sleeve is formed in the motor base, and the sealing head is movably arranged in the motor base. The sub-control type electric layered water injection packer can be set as follows: the sealing head is driven by a motor to move from a first position where the fluid channel is disconnected to a second position where the fluid channel is communicated; and the rubber sleeve is allowed to be switched between the setting state and the unsetting state. Compared with a traditional mechanical packer, the motor can be controlled through a ground control system, independent or combined setting or unsetting can be carried out on the packer on any layer position, and the inverse well flushing capacity of a layered water injection tubular column is enhanced.

Description

Technical Field

[0001] The present disclosure relates to the field of separate layer water injection in oil production engineering, and particularly to a separately controlled electric separate layer water injection packer. Background Art

[0002] A water injection packer is a downhole tool often used in oilfield water injection wells. Its purpose is to artificially isolate and divide multiple layers of oil layers with different physical properties in the same wellbore in the casing to achieve this. Usually, a mechanical packer is placed at the interlayer position to achieve this. The basic principle is to use a rubber seal such as a rubber cylinder to be compressed by hydraulic pressure or the self-weight of the tubing, so that it deforms radially under force to seal the annulus between the oil casing.

[0003] The existing washing valve function of the water well packer is mostly piston type, relying on the sealing ring to achieve radial dynamic sealing. It is greatly affected by the processing accuracy and the quality control of the sealing ring, and the service life is difficult to guarantee, which easily causes the failure of the washing valve. There are many sand-producing wells and oil-returning wells in some areas of water wells. During washing, the pressure often rises or even the well cannot be washed through. Due to the limitation of the space structure, the conventional mechanical packer is difficult to meet the requirements of high strength, reliable sealing, large washing channel and long service life at the same time. Summary of the Invention

[0004] One technical problem to be solved by the present disclosure is that the existing mechanical packer has a small washing channel, and the pressure rises or even the well cannot be washed through during washing.

[0005] To solve the above technical problem, an embodiment of the present disclosure provides a separately controlled electric separate layer water injection packer, which includes a central tube, an elastic rubber cylinder sleeved on the central tube, a motor seat with a central hole provided at one end of the central tube, a motor provided on the motor seat, a sealing head, and a transmission assembly for drivingly connecting the motor and the sealing head. A fluid channel communicating the central hole with the annulus between the central tube and the rubber cylinder is provided in the motor seat. The sealing head is movably provided in the motor seat. The separately controlled electric separate layer water injection packer can be configured to: drive the sealing head by the motor to move from a first position where the fluid channel is disconnected to a second position where the fluid channel is connected, so as to pressurize the annulus between the central tube and the rubber cylinder, so that the rubber cylinder expands to the set state; drive the sealing head by the motor to move from a first position where the fluid channel is disconnected to a second position where the fluid channel is connected, so as to depressurize the annulus between the central tube and the rubber cylinder, so that the rubber cylinder shrinks to the released state.

[0006] In some embodiments, the fluid passage includes an axially extending first passage and a radially extending second passage communicating with the first passage. A through hole axially extending and communicating with the first passage is further provided in the motor base. The sealing head is inserted into the through hole and can move to the connection of the first passage and the second passage to disconnect the fluid passage.

[0007] In some embodiments, the transmission assembly includes a lead screw drivingly connected to the motor and a nut screwed onto the lead screw. The sealing head is connected to the nut.

[0008] In some embodiments, it includes a motor sleeve covering the upper end of the motor base. The motor is disposed between the motor sleeve and the motor base.

[0009] In some embodiments, the motor base is provided with a protruding portion that stops the upper end of the motor.

[0010] In some embodiments, it further includes a fixed head disposed inside the motor sleeve and stopping the lower end of the motor.

[0011] In some embodiments, it further includes a motor plug disposed inside the motor sleeve and stopping the upper end of the motor. A sealing ring is provided between the motor plug and the motor sleeve.

[0012] In some embodiments, it further includes an upper lead screw sleeve fixedly connected to the fixed head.

[0013] In some embodiments, a sealing ring is provided between the upper lead screw sleeve and the lead screw.

[0014] In some embodiments, the fixed head partially sleeves the upper lead screw sleeve and is connected to each other through a first fixing pin.

[0015] In some embodiments, it includes a lower lead screw sleeve fixedly connected to the upper lead screw sleeve. The lower lead screw sleeve sleeves the nut and is in keyway fit to limit the rotation of the nut.

[0016] In some embodiments, the lower lead screw sleeve partially sleeves the upper lead screw sleeve and is connected to each other through a second fixing pin.

[0017] In some embodiments, it further includes an upper shoulder sleeving the upper end of the rubber cylinder and the lower end of the motor base.

[0018] In some embodiments, a sealing ring is provided between the upper shoulder and the motor sleeve.

[0019] In some embodiments, it further includes a lower joint sleeving the lower end of the central pipe.

[0020] In some embodiments, it further includes a lower shoulder sleeved on the lower joint and the lower end of the rubber cylinder at both ends.

[0021] In some embodiments, it further includes a movable sleeve disposed between the lower joint and the lower shoulder.

[0022] In some embodiments, a sealing ring is disposed between the movable sleeve and the lower joint.

[0023] In some embodiments, an upper joint is connected to the upper end of the motor base.

[0024] In some embodiments, the upper end of the central tube is inserted into the lower end of the motor base, and a sealing ring is disposed between the central tube and the motor base.

[0025] Through the above technical solutions, compared with traditional mechanical packers, the motor can be controlled by a ground control system, and the packers at any layer can be set or released independently or in combination, enhancing the backwashing ability of the stratified water injection string. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the upper part of the sub-control type electric stratified water injection packer disclosed in the embodiment of the present disclosure;

[0028] Figure 2 It is a schematic structural diagram of the middle part of the sub-control type electric stratified water injection packer disclosed in the embodiment of the present disclosure;

[0029] Figure 3 It is a schematic structural diagram of the lower part of the sub-control type electric stratified water injection packer disclosed in the embodiment of the present disclosure.

[0030] Description of the Reference Numerals:

[0031] 1 - motor plug, 2 - first sealing ring, 3 - motor sleeve, 4 - fixed head, 5 - first fixing pin, 6 - upper lead screw sleeve, 7 - second sealing ring, 8 - second fixing pin, 9 - lower lead screw sleeve, 10 - lead screw, 11 - nut, 12 - third sealing ring, 13 - sealing head, 14 - motor base, 15 - fourth sealing ring, 16 - central tube, 17 - fifth sealing ring, 18 - upper shoulder, 19 - rubber cylinder, 20 - lower shoulder, 21 - movable sleeve, 22 - sixth sealing ring, 23 - lower joint. Detailed implementation manners

[0032] The following further describes in detail the implementation manners of the present disclosure in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but including all technical solutions falling within the scope of the claims.

[0033] These embodiments of the present disclosure are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary, rather than as limitations.

[0034] It should be noted that in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality" is greater than or equal to two; the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0035] In addition, the "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Terms such as "including" or "comprising" mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements.

[0036] It should also be noted that in the description of the present disclosure, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0037] All terms used in this disclosure have the same meanings as those understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0038] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0039] Embodiment 1

[0040] Reference Figures 1 - 3 As shown, this solution provides a sub-control type electric multi-layer water injection packer, which includes a central pipe 16, an elastic rubber cylinder 19 sleeved on the central pipe 16, a motor base 14 with a central hole provided at one end of the central pipe 16, a motor provided on the motor base 14, a sealing head 13, and a transmission assembly for drivingly connecting the motor and the sealing head 13. A fluid passage communicating the central hole and the annulus between the central pipe 16 and the rubber cylinder 19 is provided in the motor base 14. The sealing head 13 is movably provided in the motor base 14. The sub-control type electric multi-layer water injection packer can be configured to: drive the sealing head 13 by the motor to move from a first position where the fluid passage is disconnected to a second position where the fluid passage is connected, so as to pressurize the annulus between the central pipe 16 and the rubber cylinder 19, causing the rubber cylinder 19 to expand to the set state; or drive the sealing head 13 by the motor to move from a first position where the fluid passage is disconnected to a second position where the fluid passage is connected, so as to depressurize the annulus between the central pipe 16 and the rubber cylinder 19, causing the rubber cylinder 19 to contract to the released state.

[0041] The sub-control type electric multi-layer water injection packer is generally formed in a tubular structure as a whole, including a central pipe 16 and a motor base 14, and the two form the main structure of the sub-control type electric multi-layer water injection packer. The central hole of the motor base 14 is butted against the central pipe 16. The sub-control type electric multi-layer water injection packer can be provided in a pipe string and lowered into a well.

[0042] The central pipe 16 is sleeved with a rubber cylinder 19. The rubber cylinder 19 is an elastic structure and can be deformed under pressure and can return to its original state by its own elasticity after the pressure is removed.

[0043] A fluid passage is provided in the motor base 14. One end of the fluid passage communicates with the central hole of the motor base 14, and the other end communicates with the annulus between the rubber cylinder 19 and the central pipe 16.

[0044] The sealing head 13 is partially disposed in the motor housing 14 and can move relative to the motor housing 14 under the driving action of the motor and the transmission assembly, particularly between a first position for disconnecting the fluid passage and a second position for connecting the fluid passage.

[0045] The motor is disposed on the motor housing 14 (not shown in the figure), and is drivingly connected to the sealing head 13 through the transmission assembly so as to drive the sealing head 13 to move linearly.

[0046] A battery can be disposed on the motor housing 14 to supply power to the motor.

[0047] In addition, the ground control system can be connected to the motor through a cable to control the motor.

[0048] When the separate control type electric multi-layer water injection packer is lowered into the well, the sealing head 13 is in the first position, and the rubber cylinder 19 is in an undeformed state; when the separate control type electric multi-layer water injection packer reaches the predetermined position and needs to be set, the motor can be started to drive the sealing head 13 to move from the first position to the second position, and at the same time, pressure is applied to the central pipe 16, and the fluid can enter between the rubber cylinder 19 and the central pipe 16 through the fluid passage in the motor housing 14, and the rubber cylinder 19 expands radially outward and deforms, and finally the rubber cylinder 19 can be pressed against the inner peripheral surface of the surrounding casing to achieve setting, and then the sealing head 13 is driven back to the first position to disconnect the fluid passage, so that the rubber cylinder 19 remains in the expanded set state.

[0049] When the setting needs to be released, the pressure application to the central pipe 16 is stopped, and the sealing head 13 is driven by the motor to move from the first position to the second position, and the fluid between the rubber cylinder 19 and the central pipe 16 returns to the central hole of the motor housing 14 and the central pipe 16 through the fluid passage under the elastic action of the rubber cylinder 19, and the rubber cylinder 19 contracts to the original released state, and the setting is released.

[0050] The separate control type electric multi-layer water injection packer can be used for the water injection string, and each packer can be independently controlled by the ground control system to achieve independent setting or releasing, and a washing well circulation channel can be established between the tubing and the casing annulus, improving the backwashing ability.

[0051] In this solution, compared with the traditional mechanical packer, the motor can be controlled by the ground control system, and the packer at any layer can be independently or combinedly set or released, enhancing the backwashing ability of the multi-layer water injection string.

[0052] In some embodiments, the fluid passage includes an axially extending first passage and a radially extending second passage communicating with the first passage. A through hole axially extending and communicating with the first passage is further provided in the motor base 14. The sealing head 13 is inserted into the through hole and can move to the connection of the first passage and the second passage to disconnect the fluid passage. As shown in the reference drawings, a passage axially extending is provided in the motor base 14. This passage is divided into an upper part and a lower part by a radially extending second passage. The lower part is the first passage, and the upper part is the through hole. A sealing head 13 is provided in the through hole. When the sealing head 13 moves downward to the connection of the second passage and the first passage and further inserts into the first passage, the communication between the second passage and the first passage can be disconnected, so that the fluid in the central hole of the motor base 14 can no longer enter the first passage.

[0053] Specifically, in some embodiments, the transmission assembly includes a lead screw 10 drivingly connected to the motor and a nut 11 screwed onto the lead screw 10. The sealing head 13 is connected to the nut 11. The nut 11 can be held non-rotatable relative to the motor base 14 by a limiting member. When the motor drives the lead screw 10 to rotate, the nut 11 can be driven to move axially, thereby driving the sealing head 13 to move axially to move between a first position and a second position. The motor rotating forward or backward can achieve the movement of the sealing head 13 towards the first position or the second position.

[0054] In addition, in some embodiments, the separate-control electric multi-layer water injection packer includes a motor sleeve 3 covering the upper end of the motor base 14. The motor is disposed between the motor sleeve 3 and the motor base 14. The motor sleeve 3 can be an arc-shaped cover structure, which covers the outside of the motor base 14 to form a space for accommodating the motor and the transmission assembly. The motor is located between the motor sleeve 3 and the motor base 14.

[0055] Among them, in some embodiments, the motor base 14 is provided with a protruding portion that stops the upper end of the motor. Refer to Figure 1 As shown, a recessed portion is provided on the outer periphery of the motor base 14. The upper end of the recessed portion is substantially aligned with the upper end of the motor sleeve 3. The portion protruding relative to the recessed portion is the protruding portion. The motor is provided with a recess. The protruding portion can stop the motor to limit the upward movement of the motor.

[0056] In addition, in some embodiments, the separate-control electric multi-layer water injection packer further includes a fixed head 4 disposed inside the motor sleeve 3 and stopping the lower end of the motor. The fixed head 4 is located below the motor and fits against the inner surface of the motor sleeve 3 to stop the lower end of the motor and limit the downward movement of the motor.

[0057] In addition, in some embodiments, the sub-controlled electric multi-layer water injection packer further includes a motor plug 1 disposed inside the motor sleeve 3 and stopping at the upper end of the motor. A sealing ring is provided between the motor plug 1 and the motor sleeve 3. The motor plug 1 is located above the motor and is inserted between the motor sleeve 3 and the motor, which can limit the upward movement of the motor. In addition, a first sealing ring 2 is provided between the motor plug 1 and the motor sleeve 3 to improve the sealing performance and prevent external fluids, etc. from entering between the motor sleeve 3 and the motor base 14 and affecting the operation of the motor.

[0058] In addition, in some embodiments, the sub-controlled electric multi-layer water injection packer further includes an upper lead screw sleeve 6 fixedly connected to the fixed head 4. The upper lead screw sleeve 6 is fixedly connected to the fixed head 4 and supports each other to be fixedly arranged near the motor. The upper lead screw sleeve 6 is sleeved on the lead screw 10 and is located between the motor sleeve 3 and the motor base 14, and can support the lead screw 10.

[0059] In addition, in some embodiments, a sealing ring is provided between the upper lead screw sleeve 6 and the lead screw 10. The second sealing ring 7 can make the upper lead screw sleeve 6 and the lead screw 10 be sealingly engaged, and can prevent the fluid below the upper lead screw sleeve 6 from flowing upward to the motor and affecting the operation of the motor.

[0060] In some embodiments, the fixed head 4 is partially sleeved on the upper lead screw sleeve 6 and is connected to each other through a first fixing pin 5. The first fixing pin 5 passes through the fixed head 4 and is inserted into the upper lead screw sleeve 6 to achieve the relative fixed connection between the fixed head 4 and the upper lead screw sleeve 6.

[0061] In addition, in some embodiments, the sub-controlled electric multi-layer water injection packer includes a lower lead screw sleeve 9 fixedly connected to the upper lead screw sleeve 6. The lower lead screw sleeve 9 is sleeved on the nut 11 and is in keyway fit to limit the rotation of the nut 11. The lower lead screw sleeve 9 is fixedly connected to the upper lead screw sleeve 6 to achieve fixation relative to the motor sleeve 3. A key or groove is formed on the inner peripheral surface of the lower lead screw sleeve 9, and a groove or key is formed on the outer peripheral surface of the nut 11. The key is received in the groove, which can limit the relative rotation of the nut 11 relative to the lower lead screw sleeve 9 and at the same time allow the nut 11 to move axially.

[0062] Among them, in some embodiments, the lower lead screw sleeve 9 is partially sleeved on the upper lead screw sleeve 6 and is connected to each other through a second fixing pin 8. The second fixing pin 8 passes through the lower lead screw sleeve 9 and is inserted into the upper lead screw sleeve 6 to achieve the relative fixed connection between the two.

[0063] Reference Figure 1As shown, a boss is provided on the inner side of the lower end of the motor sleeve 3. The fixed head 4, the upper lead screw sleeve 6, and the lower lead screw sleeve 9 are connected in sequence. The lower lead screw sleeve 9 presses against the boss on the motor sleeve 3. Thus, the motor plug 1, the motor, the fixed head 4, the upper lead screw sleeve 6, and the lower lead screw sleeve 9 are arranged to support on the boss of the motor sleeve 3, achieving mutual support and stably maintaining between the motor sleeve 3 and the motor base 14.

[0064] The lower end of the motor sleeve 3 is inserted into the motor base 14, and a third sealing ring 12 is provided between the outer side surface of the motor sleeve 3 and the motor base 14.

[0065] In addition, in some embodiments, the sub-controlled electric stratified water injection packer further includes an upper shoulder 18 sleeved on the upper end of the rubber cylinder 19 and the lower end of the motor base 14. Refer to Figure 2 As shown, the upper shoulder 18 is generally formed in a tubular shape. Its upper end is sleeved on the lower end of the motor base 14, and its lower end is sleeved on the upper end of the rubber cylinder 19, so that the upper end of the rubber cylinder 19 can be clamped between the upper shoulder 18 and the central tube 16 to prevent the upper end of the rubber cylinder 19 from detaching from the upper shoulder 18. The upper end of the rubber cylinder 19 can be adhesively connected to the upper shoulder 18.

[0066] In addition, in some embodiments, a sealing ring is provided between the upper shoulder 18 and the motor sleeve 3. A fifth sealing ring 17 is provided between the motor sleeve 3 and the upper shoulder 18 to prevent external fluids and the like from entering between the motor base 14 and the central tube 16.

[0067] In addition, in some embodiments, the sub-controlled electric stratified water injection packer further includes a lower joint 23 sleeved on the lower end of the central tube 16. The lower joint 23 can be used to connect to an oil pipe or other tubular.

[0068] In addition, in some embodiments, the sub-controlled electric stratified water injection packer further includes a lower shoulder 20 with both ends respectively sleeved on the lower end of the lower joint 23 and the lower end of the rubber cylinder 19. The lower shoulder 20 has a structure similar to that of the upper shoulder 18. The lower end of the lower shoulder 20 is sleeved on the lower joint 23, and its upper end is sleeved on the lower end of the rubber cylinder 19, which makes the lower end of the rubber cylinder 19 clamped between the lower shoulder 20 and the central tube 16 to prevent the lower end of the rubber cylinder 19 from detaching outward under fluid pressure. The lower shoulder 20 can be adhesively connected to the rubber cylinder 19 to prevent them from detaching from each other.

[0069] In addition, in some embodiments, the sub-controlled electric stratified water injection packer further includes a movable sleeve 21 provided between the lower joint 23 and the lower shoulder 20. The movable sleeve 21 can be tightly plugged between the lower shoulder 20 and the lower joint 23, so that the lower shoulder 20 is stably held in a predetermined position and prevented from detaching downward from the central tube 16. During the assembly process, the rubber cylinder 19 and the lower shoulder 20 can be first sleeved on the central tube 16, then the lower joint 23 is installed, and finally the movable sleeve 21 is installed in place.

[0070] In some embodiments, a sealing ring is provided between the movable sleeve 21 and the lower sub 23. A sixth sealing ring 22 is provided between the inner peripheral surface of the movable sleeve 21 and the outer peripheral surface of the lower sub 23 to improve the sealing performance and prevent external fluid from entering the inner side of the lower shoulder 20.

[0071] In addition, in some embodiments, an upper sub is connected to the upper end of the motor base 14. The upper sub has a structure similar to that of the lower sub 23, which is convenient for connecting with a tubing or other pipe fittings. A sealing ring can also be provided between the upper sub and the motor base 14.

[0072] In addition, in some embodiments, the upper end of the central tube 16 is inserted into the lower end of the motor base 14, and a sealing ring is provided between the central tube 16 and the motor base 14. The upper end of the central tube 16 is inserted into the motor base 14, and a fourth sealing ring 15 is provided therebetween.

[0073] Embodiment Two

[0074] This solution provides a separately controlled electric multi-layer water injection packer, which includes a central tube 16, an elastic rubber cylinder 19 sleeved on the central tube 16, a motor base 14 with a central hole provided at one end of the central tube 16, a motor provided on the motor base 14, a sealing head 13, and a transmission assembly for drivingly connecting the motor and the sealing head 13. A fluid passage communicating the central hole and the annulus between the central tube 16 and the rubber cylinder 19 is provided in the motor base 14. The sealing head 13 is movably provided in the motor base 14. The separately controlled electric multi-layer water injection packer can be configured to: drive the sealing head 13 by the motor to move from a first position where the fluid passage is disconnected to a second position where the fluid passage is connected, so as to pressurize the annulus between the central tube 16 and the rubber cylinder 19, causing the rubber cylinder 19 to expand to a set state; or drive the sealing head 13 by the motor to move from the first position where the fluid passage is disconnected to the second position where the fluid passage is connected, so as to depressurize the annulus between the central tube 16 and the rubber cylinder 19, causing the rubber cylinder 19 to contract to an unsealed state.

[0075] The separately controlled electric multi-layer water injection packer is generally formed in a tubular structure as a whole, including a central tube 16 and a motor base 14, which form the main structure of the separately controlled electric multi-layer water injection packer. The central hole of the motor base 14 is butted against the central tube 16. The separately controlled electric multi-layer water injection packer can be disposed in a pipe string and lowered into a well.

[0076] The central tube 16 is sleeved with a rubber cylinder 19. The rubber cylinder 19 is an elastic structure and can be deformed under pressure and can return to its original state by its own elasticity after the pressure is removed.

[0077] A fluid passage is provided in the motor base 14. One end of the fluid passage communicates with the central hole of the motor base 14, and the other end communicates with the annulus between the rubber cylinder 19 and the central tube 16.

[0078] The sealing head 13 is partially disposed in the motor base 14 and can move relative to the motor base 14 under the driving action of the motor and the transmission assembly, especially between a first position where the fluid passage is disconnected and a second position where the fluid passage is connected.

[0079] The motor is disposed on the motor base 14 (not shown in the figure), and is drivingly connected to the sealing head 13 through a transmission assembly so as to drive the sealing head 13 to move linearly.

[0080] A battery can be provided on the motor base 14 to supply power to the motor.

[0081] In addition, the ground control system can be connected to the motor through a cable to control the motor.

[0082] When the separate control type electric multi-layer water injection packer is lowered into the well, the sealing head 13 is in the first position, and the rubber cylinder 19 is in an undeformed state; when the separate control type electric multi-layer water injection packer reaches the predetermined position and needs to be set, the motor can be started to drive the sealing head 13 to move from the first position to the second position. At the same time, pressure is applied to the central tube 16, and the fluid can enter the annulus between the rubber cylinder 19 and the central tube 16 through the fluid passage in the motor base 14, and the rubber cylinder 19 expands and deforms radially outward. Finally, the rubber cylinder 19 can be pressed against the inner peripheral surface of the surrounding casing to achieve setting, and then the sealing head 13 is driven back to the first position to disconnect the fluid passage, so that the rubber cylinder 19 remains in the expanded and set state.

[0083] When it is necessary to release the setting, the pressure application to the central tube 16 is stopped, and the sealing head 13 is driven by the motor to move from the first position to the second position. The fluid between the rubber cylinder 19 and the central tube 16 returns to the central hole of the motor base 14 and the central tube 16 through the fluid passage under the elastic force of the rubber cylinder 19, and the rubber cylinder 19 shrinks to the original unsealed state, and the setting is released.

[0084] The separate control type electric multi-layer water injection packer can be used in the water injection string, and each packer can be independently controlled by the ground control system to achieve independent setting or releasing, improving the well flushing ability.

[0085] In this solution, compared with the traditional mechanical packer, the motor can be controlled by the ground control system, and the packer at any layer can be independently or combinedly set or released, enhancing the backwashing ability of the multi-layer water injection string.

[0086] In some embodiments, the fluid passage includes an axially extending first passage and a radially extending second passage communicating with the first passage. A through hole axially extending and communicating with the first passage is further provided in the motor base 14. The sealing head 13 is inserted into the through hole and can move to the connection of the first passage and the second passage to disconnect the fluid passage. As shown in the reference drawings, a passage axially extending is provided in the motor base 14. This passage is divided into an upper part and a lower part by a radially extending second passage. The lower part is the first passage, and the upper part is the through hole. A sealing head 13 is provided in the through hole. When the sealing head 13 moves downward to the connection of the second passage and the first passage and further inserts into the first passage, the communication between the second passage and the first passage can be disconnected, so that the fluid in the central hole of the motor base 14 can no longer enter the first passage.

[0087] Specifically, in some embodiments, the transmission assembly includes a lead screw 10 drivingly connected to the motor and a nut 11 screwed onto the lead screw 10. The sealing head 13 is connected to the nut 11. The nut 11 can be kept non-rotating relative to the motor base 14 by a limiting member. When the motor drives the lead screw 10 to rotate, the nut 11 can be driven to move axially, thereby driving the sealing head 13 to move axially to move between a first position and a second position. The motor rotating forward or backward can realize the movement of the sealing head 13 towards the first position or the second position.

[0088] In addition, in some embodiments, the separate-control electric multi-layer water injection packer includes a motor sleeve 3 covering the upper end of the motor base 14. The motor is arranged between the motor sleeve 3 and the motor base 14. The motor sleeve 3 can be an arc-shaped cover plate structure, which covers the outside of the motor base 14 to form a space for accommodating the motor and the transmission assembly. The motor is located between the motor sleeve 3 and the motor base 14.

[0089] Among them, in some embodiments, the motor base 14 is provided with a protruding portion that stops the upper end of the motor. Refer to Figure 1 As shown, a recessed portion is provided on the outer periphery of the motor base 14. The upper end of the recessed portion is substantially aligned with the upper end of the motor sleeve 3. The part protruding relative to the recessed portion is the protruding portion. The motor is provided with a recess. The protruding portion can stop the motor to limit the upward movement of the motor.

[0090] In addition, in some embodiments, the separate-control electric multi-layer water injection packer further includes a fixed head 4 provided inside the motor sleeve 3 and stopping the lower end of the motor. The fixed head 4 is located below the motor and fits against the inner surface of the motor sleeve 3 to stop the lower end of the motor and limit the downward movement of the motor.

[0091] In addition, in some embodiments, the sub-controlled electric stratified water injection packer further includes a motor plug 1 disposed inside the motor sleeve 3 and stopping at the upper end of the motor. A sealing ring is provided between the motor plug 1 and the motor sleeve 3. The motor plug 1 is located above the motor and is inserted between the motor sleeve 3 and the motor, which can limit the upward movement of the motor. In addition, a first sealing ring 2 is provided between the motor plug 1 and the motor sleeve 3 to improve the sealing performance and prevent external fluids, etc. from entering between the motor sleeve 3 and the motor base 14 and affecting the operation of the motor.

[0092] In addition, in some embodiments, the sub-controlled electric stratified water injection packer further includes an upper lead screw sleeve 6 fixedly connected to the fixed head 4. The upper lead screw sleeve 6 is fixedly connected to the fixed head 4 and supports each other to be fixedly arranged near the motor. The upper lead screw sleeve 6 is sleeved on the lead screw 10 and is located between the motor sleeve 3 and the motor base 14, and can support the lead screw 10.

[0093] In addition, in some embodiments, a sealing ring is provided between the upper lead screw sleeve 6 and the lead screw 10. The second sealing ring 7 can make the upper lead screw sleeve 6 and the lead screw 10 be in sealing engagement, and can prevent the fluid below the upper lead screw sleeve 6 from flowing upward to the motor and affecting the operation of the motor.

[0094] In some embodiments, the upper lead screw sleeve 6 is partially sleeved on the fixed head 4 and is connected to each other through a fixing pin. The first fixing pin 5 passes through the upper lead screw sleeve 6 and is inserted into the fixed head 4 to achieve the relative fixed connection between the fixed head 4 and the upper lead screw sleeve 6.

[0095] In addition, in some embodiments, the sub-controlled electric stratified water injection packer includes a lower lead screw sleeve 9 fixedly connected to the upper lead screw sleeve 6. The lower lead screw sleeve 9 is sleeved on the nut 11 and is in keyway fit to limit the rotation of the nut 11. The lower lead screw sleeve 9 is fixedly connected to the upper lead screw sleeve 6 to achieve fixation relative to the motor sleeve 3. A key or groove is formed on the inner peripheral surface of the lower lead screw sleeve 9, and a groove or key is formed on the outer peripheral surface of the nut 11. The key is received in the groove, which can limit the relative rotation of the nut 11 relative to the lower lead screw sleeve 9 and also allow the nut 11 to move axially.

[0096] Among them, in some embodiments, the upper lead screw sleeve 6 is partially sleeved on the lower lead screw sleeve 9 and is connected to each other through a second fixing pin 8. The second fixing pin 8 passes through the upper lead screw sleeve 6 and is inserted into the lower lead screw sleeve 9 to achieve the relative fixed connection between the two.

[0097] Reference Figure 1As shown, a boss is provided on the inner side of the lower end of the motor sleeve 3. The fixed head 4, the upper lead screw sleeve 6, and the lower lead screw sleeve 9 are connected in sequence. The lower lead screw sleeve 9 presses against the boss on the motor sleeve 3. Thus, the motor plug 1, the motor, the fixed head 4, the upper lead screw sleeve 6, and the lower lead screw sleeve 9 are arranged to support on the boss of the motor sleeve 3, achieving mutual support and stably maintaining between the motor sleeve 3 and the motor base 14.

[0098] The lower end of the motor sleeve 3 is inserted into the motor base 14, and a third sealing ring 12 is provided between the outer side surface of the motor sleeve 3 and the motor base 14.

[0099] In addition, in some embodiments, the separate-control electric stratified water injection packer further includes an upper shoulder 18 sleeved on the upper end of the rubber cylinder 19 and the lower end of the motor base 14. Refer to Figure 2 As shown, the upper shoulder 18 is generally formed in a tubular shape. Its upper end is sleeved on the lower end of the motor base 14, and its lower end is sleeved on the upper end of the rubber cylinder 19, so that the upper end of the rubber cylinder 19 can be clamped between the upper shoulder 18 and the central tube 16 to prevent the upper end of the rubber cylinder 19 from detaching from the upper shoulder 18. The upper end of the rubber cylinder 19 can be adhesively connected to the upper shoulder 18.

[0100] In addition, in some embodiments, a sealing ring is provided between the upper shoulder 18 and the motor sleeve 3. A fifth sealing ring 17 is provided between the motor sleeve 3 and the upper shoulder 18 to prevent external fluids, etc. from entering between the motor base 14 and the central tube 16.

[0101] In addition, in some embodiments, the separate-control electric stratified water injection packer further includes a lower joint 23 sleeved on the lower end of the central tube 16. The lower joint 23 can be used to connect to an oil pipe or other tubular.

[0102] In addition, in some embodiments, the separate-control electric stratified water injection packer further includes a lower shoulder 20 with both ends sleeved on the lower end of the lower joint 23 and the lower end of the rubber cylinder 19 respectively. The lower shoulder 20 has a structure similar to that of the upper shoulder 18. The lower end of the lower shoulder 20 is sleeved on the lower joint 23, and its upper end is sleeved on the lower end of the rubber cylinder 19, which makes the lower end of the rubber cylinder 19 clamped between the lower shoulder 20 and the central tube 16 to prevent the lower end of the rubber cylinder 19 from detaching outward under fluid pressure. The lower shoulder 20 can be adhesively connected to the rubber cylinder 19 to prevent them from detaching from each other.

[0103] In addition, in some embodiments, the separate-control electric stratified water injection packer further includes a movable sleeve 21 provided between the lower joint 23 and the lower shoulder 20. The movable sleeve 21 can be tightened between the lower shoulder 20 and the lower joint 23, so that the lower shoulder 20 is stably maintained in a predetermined position and prevented from detaching downward from the central tube 16. During the assembly process, the rubber cylinder 19 and the lower shoulder 20 can be sleeved on the central tube 16 first, then the lower joint 23 is installed, and finally the movable sleeve 21 is installed in place.

[0104] In some embodiments, a sealing ring is provided between the movable sleeve 21 and the lower sub 23. A sixth sealing ring 22 is provided between the inner peripheral surface of the movable sleeve 21 and the outer peripheral surface of the lower sub 23 to improve the sealing performance and prevent external fluid from entering the inside of the lower shoulder 20.

[0105] In addition, in some embodiments, an upper sub is connected to the upper end of the motor base 14. The upper sub has a structure similar to that of the lower sub 23, which is convenient for connecting with a tubing string or other pipe fittings. A sealing ring may also be provided between the upper sub and the motor base 14.

[0106] In addition, in some embodiments, the upper end of the central tube 16 is inserted into the lower end of the motor base 14, and a sealing ring is provided between the central tube 16 and the motor base 14. The upper end of the central tube 16 is inserted into the motor base 14, and a fourth sealing ring 15 is provided therebetween.

[0107] The sub-controlled electric separate layer water injection packer can be disposed in a separate layer water injection string, and multiple packers can be provided to form a plurality of mutually separated annuli arranged along the string. A ball seat is provided at the lower part of the string, and a ball can be thrown to seal, so as to pressurize multiple packers to achieve setting.

[0108] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details well known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0109] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A sub-controlled electric stratified water injection packer, characterized in that, It includes a central tube (16), an elastic rubber cylinder (19) sleeved on the central tube (16), a motor base (14) with a central hole provided at one end of the central tube (16), a motor provided on the motor base (14), a sealing head (13), and a transmission assembly for drivingly connecting the motor and the sealing head (13). A fluid passage communicating the central hole and the annulus between the central tube (16) and the rubber cylinder (19) is provided in the motor base (14). The sealing head (13) is movably provided in the motor base (14). The sub-controlled electric hierarchical water injection packer can be configured to: drive the sealing head (13) by the motor to move from a first position where the fluid passage is disconnected to a second position where the fluid passage is connected, so as to pressurize the annulus between the central tube (16) and the rubber cylinder (19), causing the rubber cylinder (19) to expand to a set state; drive the sealing head (13) by the motor to move from a first position where the fluid passage is disconnected to a second position where the fluid passage is connected, so as to depressurize the annulus between the central tube (16) and the rubber cylinder (19), causing the rubber cylinder (19) to contract to an unsealed state.

2. The sub-controlled electric stratified water injection packer according to claim 1, characterized in that, The fluid passage includes an axially extending first passage and a radially extending second passage communicating with the first passage. A through hole axially extending and communicating with the first passage is further provided in the motor base (14). The sealing head (13) is inserted into the through hole and can move to the connection of the first passage and the second passage to disconnect the fluid passage.

3. The sub-controlled electric stratified water injection packer according to claim 1, characterized in that, The transmission assembly includes a lead screw (10) drivingly connected to the motor and a nut (11) screwed onto the lead screw (10). The sealing head (13) is connected to the nut (11).

4. The sub-controlled electric stratified water injection packer according to claim 3, characterized in that, It includes a motor sleeve (3) covering the upper end of the motor base (14). The motor is provided between the motor sleeve (3) and the motor base (14).

5. The sub-controlled electric stratified water injection packer according to claim 4, characterized in that, The motor base (14) is provided with a protrusion for stopping the upper end of the motor.

6. The sub-controlled electric stratified water injection packer according to claim 5, characterized in that, It further includes a fixed head (4) provided inside the motor sleeve (3) and stopping at the lower end of the motor.

7. The sub-controlled electric stratified water injection packer according to claim 6, characterized in that, It further includes a motor plug (1) provided inside the motor sleeve (3) and stopping at the upper end of the motor. A sealing ring is provided between the motor plug (1) and the motor sleeve (3).

8. The sub-controlled electric stratified water injection packer according to claim 7, characterized in that, It further includes an upper lead screw sleeve (6) fixedly connected to the fixed head (4).

9. The sub-controlled electric stratified water injection packer according to claim 8, characterized in that, A sealing ring is provided between the upper lead screw sleeve (6) and the lead screw (10).

10. The sub-controlled electric stratified water injection packer according to claim 8, characterized in that, The fixed head (4) partially sleeves the upper lead screw sleeve (6) and is connected to each other through a first fixing pin (5).

11. The sub-controlled electric stratified water injection packer according to claim 8, characterized in that, It includes a lower lead screw sleeve (9) fixedly connected to the upper lead screw sleeve (6). The lower lead screw sleeve (9) sleeves the nut (11) and is in keyway fit to limit the rotation of the nut (11).

12. The sub-controlled electric stratified water injection packer according to claim 8, characterized in that, The lower lead screw sleeve (9) partially sleeves the upper lead screw sleeve (6) and is connected to each other through a second fixing pin (8).

13. The sub-controlled electric stratified water injection packer according to claim 1, characterized in that, It further includes an upper shoulder (18) sleeved on the upper end of the rubber cylinder (19) and the lower end of the motor base (14).

14. The sub-controlled electric stratified water injection packer according to claim 13, characterized in that, A sealing ring is provided between the upper shoulder (18) and the motor sleeve (3).

15. The sub-controlled electric stratified water injection packer according to claim 14, characterized in that, It further includes a lower joint (23) sleeved on the lower end of the central tube (16).

16. The sub-controlled electric stratified water injection packer according to claim 15, characterized in that, It further includes a lower shoulder (20) with both ends sleeved on the lower end of the lower joint (23) and the rubber cylinder (19) respectively.

17. The sub-controlled electric stratified water injection packer according to claim 16, characterized in that, It further includes a movable sleeve (21) provided between the lower joint (23) and the lower shoulder (20).

18. The sub-controlled electric layered water injection packer according to claim 17, wherein, A sealing ring is provided between the movable sleeve (21) and the lower joint (23).

19. The sub-controlled electric layered water injection packer according to claim 1, wherein, An upper joint is connected to the upper end of the motor base (14).

20. The sub-controlled electric layered water injection packer according to claim 1, wherein, The upper end of the central tube (16) is inserted into the lower end of the motor base (14), and a sealing ring is provided between the central tube (16) and the motor base (14).

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