Double-anchoring packer for normal production well

Abstract

The invention belongs to the technical field of oil field underground water injection and measurement and regulation, and particularly relates to a double-anchoring packer for a normal production well, which comprises a central pipe, a plugging mechanism and an anchoring mechanism are connected to the position, close to the middle, of the central pipe, the lower end of the central pipe is connected with a releasing and releasing mechanism, and the upper end of the central pipe is connected with a releasing mechanism; the releasing and unfreezing mechanism comprises a continuous hoop, the continuous hoop is connected with the central pipe through threads, the other end of the continuous hoop is connected with a spring claw through threads, a supporting body is connected in the spring claw in a sleeved mode, the supporting body is connected with the spring claw through a control pin C, and a lower connector is arranged outside the spring claw. The plugging mechanism comprises a rubber cylinder and a cylinder sleeve which are fixed on the outer side wall of the central pipe, the cylinder sleeve is connected with the central pipe in an up-down sliding manner, and the rubber cylinder is arranged outside the cylinder sleeve; by adopting a downward-pressing and upward-lifting deblocking mode, the packer is simple in design structure, easy to process, low in cost, light, high in success rate of a water plugging process and capable of meeting the functions of multi-layer plugging and the like by being matched with other packers.

Description

Technical Field

[0001] The invention belongs to the field of oilfield regular production well exploitation, and in particular relates to a double-anchored packer for regular production wells. Background Art

[0002] In the process of oil field development, the hand-free water plugging pipe string is often used, which has the following advantages: 1. Avoid replacing the packer during operations such as pump inspection and deepening the pump hanger that are not related to plugging failure, affecting crude oil production and causing unnecessary waste. 2. Avoid the creep of the pipe string caused by the production pump pumping oil, which affects the plugging performance of the packer, shortens the effective plugging time, and increases the workload. It is more reasonable to use the hand-free water plugging pipe string when the water discharge status of the oil layer is clearly understood. At present, there are various types of bridge plugs and packers used for water plugging in production, and the main problems are as follows: 1. Complex structure, high processing cost, difficult assembly, and high assembly failure rate; 2. The lifting and unsealing method is adopted, which has a large unsealing load, makes the operation difficult, or even impossible to unseal, often resulting in major repairs.

[0003] 3. When the lifting force on the release joint is too large, it is easy to cause mis-sealing, resulting in ineffective sealing operation. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems of the prior art such as large unlocking force, complex structure, complex assembly, low plugging success rate, and failure to meet multi-layer drop-out plugging requirements, thereby providing a double-anchored packer for regular production wells.

[0005] The object of the present invention is achieved as follows: A double-anchored packer for a well in a normal production process comprises a center tube, a plugging mechanism and an anchoring mechanism are connected to the center tube at a position near the middle, a release mechanism is connected to the lower end of the center tube, and a release mechanism is connected to the upper end of the center tube; the release mechanism comprises an extension hoop, the extension hoop is connected to the center tube by a thread, the other end of the extension hoop is connected to a spring claw by a thread, a support body is sleeved inside the spring claw, and the support body and the spring claw are connected by a control pin C, and a lower joint is arranged on the outside of the spring claw; the plugging mechanism comprises a rubber tube and a tube sleeve fixed on the outer side wall of the center tube, the tube sleeve and the center tube are connected in an up and down sliding manner, the rubber tube is arranged on the outside of the tube sleeve, and a seating mechanism is connected on the top of the rubber tube.

[0006] Furthermore, the number of the rubber cylinders outside the cylinder sleeve is not less than 2 groups, and a spacer ring is provided between two adjacent groups of rubber cylinders to ensure the sealing effect.

[0007] Furthermore, the anchoring mechanism includes a sleeve, which is sleeved on the outside of the central tube, a slot is provided on the side surface of the sleeve, a cava is provided in the slot, a return spring is provided between the cava and the sleeve, an upper cone and a lower cone are provided above and below the cava, respectively, the upper cone and the lower cone are located between the sleeve and the central tube and are respectively connected to the sleeve and the central tube for sliding up and down, the upper end face and the lower end face of the cava respectively adopt a conical mechanism, the upper and lower end faces of the cava respectively coincide with the conical surfaces of the upper cone and the lower cone and are close together, and the conical surfaces of the upper cone and the lower cone are slidably connected to the upper and lower end faces of the cava, the lower cone is connected to the lower joint by a thread, the conical surface of the upper cone moves along the conical surface of the cava in the direction of the cava, which will push the cava to move outward along the side wall of the slot, thereby firmly anchoring on the casing wall to achieve the fixation of the packer and the casing.

[0008] Furthermore, the seating mechanism includes a connecting head, which is sleeved on the outside of the center tube and the upper end of which is connected to the center tube by a thread. The lower end of the connecting head is a cylinder sleeve, and a lock seat and a lock sleeve are arranged between the cylinder sleeve and the center tube. The lock seat is sleeved and connected to the center tube, and pistons A and pistons B are arranged at the upper and lower ends of the lock seat respectively. The lock sleeve and piston A are sleeved on the outside of the lock seat, and the piston A is located at the upper end of the lock sleeve, and the piston B is located at the lower end of the lock sleeve and sleeved on the inside of the lock sleeve. The piston B is sleeved on the outside of the tube sleeve, and the lower end of the piston rests on the rubber cylinder. The piston B is connected to the cylinder sleeve of the connecting head by a control pin B, and the tube sleeve is connected to the upper cone by a thread. A seating locking mechanism is arranged between the lock sleeve and the lock seat, and the position of the lock sleeve can be locked by the seating locking mechanism to prevent it from retreating in the reverse direction.

[0009] Furthermore, the seat locking mechanism includes a locking ring mounted on the outside of the lock seat, an outer surface of the locking ring is provided with an external thread buckle that cooperates with the internal thread buckle on the upper end of the locking sleeve, a through groove along the axis direction of the central tube is provided on the side of the locking ring, and chamfers are provided on the top of the outer surface of the locking ring and the bottom of the internal thread buckle of the locking sleeve. When the internal thread buckle on the inner surface of the locking sleeve moves to the position of the locking ring, it will engage with the external thread buckle on the locking ring, thereby locking the locking sleeve in place to prevent the locking sleeve from retreating in the reverse direction.

[0010] Furthermore, a pin ring is arranged above the locking ring, and the pin ring is sleeved on the outside of the lock seat, and the pin ring and the lock seat are connected by a thread, and a slope structure gradually inclined from top to bottom toward the center tube is adopted on the outer side surface of the pin ring near the bottom end, and a slope structure matching the pin ring is adopted on the inner side surface of the locking ring near the top end, when the locking sleeve and the locking ring move upward under the action of the rebound force of the rubber cylinder, the pin ring can not only limit the locking ring and the locking sleeve to prevent them from continuing to move upward, but also when the lower end of the pin ring gradually moves into the locking ring, the top end of the locking ring can expand outward, thereby further ensuring the bite effect between the locking ring and the locking sleeve.

[0011] Furthermore, the release mechanism includes an upper joint arranged above the central tube, the upper joint is sleeved in the connecting head, a tapered hole is arranged on the side wall of the upper joint, a steel ball is arranged in the tapered hole, the lower half of the steel ball is arranged in the receiving groove of the inner side wall of the connecting head, the upper side surface of the receiving groove adopts an inclined surface structure that gradually increases the opening of the receiving groove, a sliding sleeve is arranged in the upper joint, the sliding sleeve and the upper joint are connected by a control pin A, and a return groove is arranged on the axis corresponding to the tapered hole on the outer side wall of the sliding sleeve, by hitting the sliding sleeve, the control pin A is sheared off, and the sliding sleeve is moved downward, when the return groove on the sliding sleeve corresponds to the steel ball, the pipe column is lifted upward by the working vehicle, and the steel ball can be squeezed into the return groove in the sliding sleeve through the inclined surface structure on the upper side surface of the receiving groove on the connecting head, at this time, the lifting and hanging relationship can be released, and the releasing action of the pipe column is completed, which is convenient to operate.

[0012] Beneficial effects of the present invention: The present invention changes the previous unsealing method of the bridge plug, adopts the unsealing method of pressing down and lifting up, changes the factors that form the unsealing force, and utilizes the downward impact force of the pipe column's own weight to effectively solve the unsealing problem. At the same time, the design structure is simple, the processing is easy, the cost is low, it is light, and the success rate of the water plugging process is high. It can be matched with other packers to meet the functions of multi-layer plugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 The present invention is a schematic diagram of the cross-sectional structure of a double-anchored packer for a conventional well.

[0015] Description of reference numerals: 1. Center tube; 2. Extension hoop; 3. Spring claw; 4. Support body; 5. Control pin C; 6. Lower joint; 7. Rubber cylinder; 8. Cylinder sleeve; 9. Spacer ring; 10. Sheath; 11. Slot hole; 12. Slip; 13. Reset spring; 14. Upper cone; 15. Lower cone; 16. Connector; 17. Cylinder sleeve; 18. Lock seat; 19. Lock sleeve; 20. Piston A; 21. Piston B; 22. Control pin B; 23. Lock ring; 24. Pin ring; 25. Upper joint; 26. Conical hole; 27. Steel ball; 28. Accommodation groove; 29. ​​Sliding sleeve; 30. Control pin A; 31. Fall-back groove. DETAILED DESCRIPTION

[0016] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0017] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention.

[0018] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] In one embodiment of the present invention, Figure 1 As shown, a double-anchored packer for commonly used wells comprises a central pipe 1, a plugging mechanism and an anchoring mechanism are connected near the middle of the central pipe 1, a release mechanism is connected to the lower end of the central pipe 1, and a release mechanism is connected to the upper end of the central pipe 1; the release mechanism comprises a connecting hoop 2, the connecting hoop 2 is connected to the central pipe 1 by a thread, the other end of the connecting hoop 2 is connected to a spring claw 3 by a thread, a support body 4 is sleeved inside the spring claw 3, and the support body 4 and the spring claw 3 are connected by a control pin C5, and a lower joint 6 is arranged on the outside of the spring claw 3; the plugging mechanism comprises a rubber tube 7 and a tube sleeve 8 fixed on the outer side wall of the central pipe 1, the tube sleeve 8 is connected to the central pipe 1 in an up and down sliding manner, the rubber tube 7 is arranged on the outside of the tube sleeve 8, and a seating mechanism is connected on the top of the rubber tube 7.

[0022] In one embodiment of the present invention, Figure 1 As shown, the number of the rubber tubes 7 outside the tube sleeve 8 is not less than 2 groups, and a spacer ring 9 is provided between two adjacent groups of rubber tubes 7 to ensure the sealing effect.

[0023] In one embodiment of the present invention, Figure 1 As shown, the anchoring mechanism includes a sheath 10, the sheath 10 is sleeved on the outside of the central tube 1, a slot 11 is provided on the side of the sheath 10, a slip 12 is provided in the slot 11, a return spring 13 is provided between the slip 12 and the sheath 10, an upper cone 14 and a lower cone 15 are provided above and below the slip 12, respectively, the upper cone 14 and the lower cone 15 are located between the sheath 10 and the central tube 1 and are respectively connected to the sheath 10 and the central tube 1 in an up-and-down sliding manner, and the upper end surface and the lower end surface of the slip 12 are respectively A conical mechanism is adopted, and the upper and lower end surfaces of the cava 12 are respectively matched with the conical surfaces of the upper cone 14 and the lower cone 15 and are close together, and the conical surfaces of the upper cone 14 and the lower cone 15 are slidingly connected to the upper and lower end surfaces of the cava 12, and the lower cone 15 is connected to the lower joint 6 by a thread. The conical surface of the upper cone 14 or the lower cone 15 moves along the conical surface of the cava 12 in the direction where the cava 12 is located, which will push the cava 12 to move outward along the side wall of the slot 11, so that it is firmly anchored on the casing wall to achieve the fixation of the packer and the casing.

[0024] In one embodiment of the present invention, Figure 1As shown, the seat mechanism includes a connector 16, which is sleeved on the outside of the central tube 1 and its upper end is connected to the central tube 1 through a thread, the lower end of the connector 16 is a cylinder sleeve 17, a lock seat 18 and a lock sleeve 19 are arranged between the cylinder sleeve 17 and the central tube 1, the lock seat 18 is fixedly connected to the central tube 1, and the upper and lower ends of the lock seat 18 are respectively provided with a piston A20 and a piston B21, the lock sleeve 19 and the piston A20 are sleeved on the outside of the lock seat 18, and the piston A20 is located at the lock seat 18. The piston B21 is located at the upper end of the lock sleeve 19, and is sleeved inside the lock sleeve 19. The piston B21 is sleeved on the outside of the cylinder sleeve 8, and its lower end abuts against the rubber cylinder 7. The piston B21 is connected to the cylinder sleeve 17 of the connector 16 through a control pin B22, and the cylinder sleeve 8 is connected to the upper cone 14 through a thread. A seat locking mechanism is provided between the lock sleeve 19 and the lock seat 18, and the position of the lock sleeve 19 can be locked by the seat locking mechanism to prevent it from retreating in the reverse direction.

[0025] In one embodiment of the present invention, Figure 1 As shown, the seat locking mechanism includes a lock ring 23 which is sleeved on the outside of the lock seat 18, and an external thread buckle is provided on the outer surface of the lock ring 23 to cooperate with the internal thread buckle on the upper end of the lock sleeve 19, and a through groove along the axial direction of the center tube 1 is provided on the side of the lock ring 23, and chamfers are provided on the top of the outer surface of the lock ring 23 and the bottom of the internal thread buckle of the lock sleeve 19 respectively. When the internal thread buckle on the inner surface of the lock sleeve 19 moves to the position of the lock ring 23, it will engage with the external thread buckle on the lock ring 23, thereby locking and positioning the lock sleeve 19 to prevent the lock sleeve 19 from retreating in the reverse direction.

[0026] In one embodiment of the present invention, Figure 1 As shown, a pin ring 24 is provided above the lock ring 23, and the pin ring 24 is sleeved on the outside of the lock seat 18, and the pin ring 24 and the lock seat 18 are connected by threads. The outer surface of the pin ring 24 near the bottom end adopts an inclined surface structure that gradually inclines toward the center tube 1 from top to bottom, and the inner surface of the lock ring 23 near the top end adopts an inclined surface structure that matches the pin ring 24. When the lock sleeve 19 and the lock ring 23 move upward under the action of the rubber cylinder 7, the pin ring 24 can not only limit the lock ring 23 and the lock sleeve 19 to prevent them from continuing to move upward, but also when the lower end of the pin ring 24 gradually moves into the lock ring 23, the top end of the lock ring 23 can expand outward, thereby further ensuring the bite effect between the lock ring 23 and the lock sleeve 19.

[0027] In one embodiment of the present invention, Figure 1As shown, the release mechanism includes an upper joint 25 arranged above the central tube 1, the upper joint 25 is sleeved in the connector 16, a tapered hole 26 is arranged on the side wall of the upper joint 25, a steel ball 27 is arranged in the tapered hole 26, the lower half of the steel ball 27 is arranged in the receiving groove 28 of the inner side wall of the connector 16, the upper side surface of the receiving groove 28 adopts an inclined surface structure that gradually increases the opening of the receiving groove 28, a sliding sleeve 29 is arranged in the upper joint 25, and a control is provided between the sliding sleeve 29 and the upper joint 25. The control pin A30 is connected, and a return groove 31 is provided on the outer wall of the sliding sleeve 29 on the axis corresponding to the tapered hole 26. By hitting the sliding sleeve 29, the control pin A30 is sheared off, and the sliding sleeve 29 is moved downward. When the return groove 31 on the sliding sleeve 29 corresponds to the steel ball 27, the pipe column is lifted upward by the working vehicle, and the steel ball 27 can be squeezed into the return groove 31 in the sliding sleeve 29 through the inclined structure on the upper side of the accommodating groove 28 on the connecting head 16. At this time, the lifting and hanging relationship can be released, and the hand-dropping action of the pipe column is completed, which is easy to operate.

[0028] In one embodiment of the present invention, Figure 1 As shown, the packer comprises upper and lower (joint) locking and releasing mechanisms, a sitting locking mechanism, a plugging mechanism, an anchoring mechanism and a releasing mechanism, wherein the upper and lower joint (end) locking and releasing mechanisms comprise a connector 16, a center pipe 1, a hoop 2, a spring claw 3, a support body 4, a control pin C5 and a lower joint 6, etc. The upper and lower joint (end) locking and releasing mechanisms are located at both ends of the center pipe 1. The center pipe 1 is provided with threads at the upper and lower ends. The inner wall of the connector 16 is stepped. The upper step is provided with a lifting groove, the middle step is provided with threads, and the lower end is a cylinder sleeve 17. The upper end of the center pipe 1 is connected to the connector 16 through threads, the hoop 2 is connected to the lower end of the center pipe 1 through threads, and the lower end of the hoop 2 is connected to the spring claw 3 through threads. The support body 4 is sleeved in the spring claw 3 and fixed together through the control pin C5. The spring claw 3 is designed with an outer boss at the lower end, and the lower joint 6 is placed between the outer boss of the spring claw 3 and the step at the end of the hoop 2 to form a limiting relationship.

[0029] The seat locking structure is sleeved on the periphery of the central tube 1, and the seat locking structure includes a connector 16 cylinder sleeve 17, a piston A20, a piston B21, a lock seat 18, a lock ring 23, a pin ring 24, a lock sleeve 19 and a control pin B22, etc. The lock seat 18 is in the shape of a multi-step step, and the middle step is provided with a thread, and the pin ring 24 is connected to the lock seat 18 through the thread, and the lock ring 23 is located between the pin ring 24 and the step of the lock seat 18. The lock sleeve 19 and the piston A20 are sleeved on the periphery of the lock seat 18, the piston A20 is located at the upper end of the lock sleeve 19, and the piston B21 is located at the lower end of the lock sleeve 19 and sleeved inside the lock sleeve 19. The piston B21 is provided with a pin groove on the periphery and is fixed together with the connector 16 cylinder sleeve 17 through the control pin B22.

[0030] The plugging mechanism and the anchoring mechanism are sleeved on the periphery of the central tube 1 and are located at the lower part of the seat locking mechanism, which includes a rubber cylinder 7, a sleeve 8, a spacer ring 9, an upper cone 14, a slip 12, a sleeve 10, a reset spring 13 and a lower cone 15, etc. The sleeve 8 is a stepped structure, and the rubber cylinder 7 and the spacer ring 9 are sleeved on the upper stage of the sleeve 8. The lower stage of the sleeve 8 is provided with a thread on the outside. The inner and outer walls of the upper cone 14 are cylindrical stepped structures, with cylindrical steps inside and outside, and the inner wall steps are provided with threads, which are connected to the sleeve 8 through the threads. There is a cylindrical step inside the upper end of the sleeve 10, and 8 slots 11 for placing slips 12 are opened in the middle. The sleeve 10 is hung on the outer step of the upper cone 14 through the internal step, the slip 12 is placed in the slot 11 in the middle of the sleeve 10, the slip 12 is provided with upper and lower conical surfaces, the conical surface of the upper end of the slip 12 is close to the conical surface of the upper cone 14, there is a partition between the middle slot 11 of the sleeve 10, the reset spring 13 is placed between the partition and the middle of the slip 12, the lower cone 15 is located inside the sleeve 10, the conical surface of the lower cone 15 is close to the conical surface of the lower end of the slip 12, and the lower periphery of the lower cone 15 is provided with a thread, which is connected to the lower joint 6 through the thread.

[0031] The release mechanism is located at the upper end of the locking and releasing mechanism of the upper and lower joints, and includes an upper joint 25, a sliding sleeve 29, a control pin A30 and a steel ball 27, etc. The sliding sleeve 29 is cylindrical, and the outer wall is provided with a lifting step, a pin groove, a return groove 31, etc. The upper joint 25 is stepped in the inner and outer walls, the upper step is provided with a pin thread groove, and the lower step is provided with a tapered hole 26. The sliding sleeve 29 is placed in the upper joint 25, and the control pin A30 is installed in the thread groove of the upper joint 25 through a thread. The front end of the control pin A30 is inserted into the pin groove of the sliding sleeve 29. The steel ball 27 is placed in the tapered hole 26 provided in the lower step of the upper joint 25, and is located between the outer wall of the sliding sleeve 29 and the lifting groove provided on the upper end step of the connector 16, forming a limited lifting relationship.

[0032] The present invention provides a bidirectional anchoring packer for a well in a normal production process. The connector 16, the center pipe 1, the extension hoop 2, the spring claw 3, the support body 4, the control pin C5 and the lower joint 6 form a locking and releasing mechanism. The upper and lower ends of the center pipe 1 are provided with threads. The inner wall of the connector 16 is stepped, and the middle step is provided with threads. The upper end of the center pipe 1 is connected to the connector 16 through the threads, the extension hoop 2 is connected to the lower end of the center pipe 1 through the threads, and the lower end of the extension hoop 2 is connected to the spring claw 3 through the threads. The support body 4 is sleeved in the spring claw 3 and fixed together through the control pin C5. The spring claw 3 is designed with an outer boss at the lower end, and the lower joint 6 is placed between the outer boss of the spring claw 3 and the step at the end of the extension hoop 2 to form a limiting relationship. Under the limiting condition of the two, the spring claw 3, the extension hoop 2 and the lower joint 6 cannot move up and down relative to each other. The support body 4 can move downward along the inner wall of the spring claw 3 under the action of external force, and the spring claw 3 can be retracted.

[0033] The working process includes the following steps: The first step is to connect a bidirectional anchor packer for a commonly produced well and other supporting tools together. The connection sequence is: oil pipe + a bidirectional anchor packer for a commonly produced well + oil pipe + other supporting tools. The bidirectional anchor packer for a commonly produced well is delivered to the designed production position of the oil well through the tubing string.

[0034] The second step is to connect the ground cement truck and other pumping equipment to the pipe string, inject water pressure into the pipe string, and set a bidirectional anchor packer for common wells. The water pressure enters the piston cavity through the pipe string, the upper joint 25 of the packer, the water inlet channel of the central pipe 1, and the gap between the lock seat 18 and the central pipe 1, pushing the piston A20 and the piston B21 forward. The piston A20 and the piston B21 directly or indirectly transmit the thrust to the control pin B22 through the lock sleeve 19 and the piston B21, cut off the control pin B22, and the piston A20 and the piston B21 continue to move forward, pushing the rubber cylinder 7, the cylinder sleeve 8, and the upper cone 14. The piston A20 and the piston B21 move forward, and then push the slip 12 to bulge outward along the conical surfaces of the upper and lower cones 15, expand, and then close to the casing wall. As the pressure continues to increase, the slip 12 is firmly anchored on the casing wall, and the pistons A20 and B21 continue to squeeze forward to gradually increase the radial size of the rubber cylinder 7, and finally seal the annulus between the oil pipe and the casing to achieve the purpose of plugging. When the pressure increases and the pistons A20 and B21 move forward a certain distance, the internal thread buckle at the upper end of the locking sleeve 19 moves forward to the position of the locking ring 23, engages with the external buckle of the locking ring 23, and locks to prevent the locking sleeve 19 from retreating in the opposite direction, completing the sealing and locking process of the packer.

[0035] The third step is to remove the sealing and pressure equipment, and put two connected sucker rods into the oil pipe string. The sucker rods move downward by free fall and hit the sliding sleeve 29 of the release mechanism, shearing the control pin A30 and moving the sliding sleeve 29 downward. At this time, the return groove 31 on the sliding sleeve 29 is just aligned with the position of the steel ball 27. Then, the pipe string is lifted by the work vehicle, and the steel ball 27 is forced to enter the return groove 31 of the sliding sleeve 29, releasing the lifting and hanging relationship, completing the pipe string release action, and the pipe string above the packer is disengaged, and the delivery pipe string is pulled out.

[0036] The fourth step is to lower the production oil production tubing string and start pumping. During the production process, when the formation pressure below the packer is high, the formation pressure is directly or indirectly transmitted to the lower cone 15 of the packer through the rubber cylinder 7, piston B21, locking sleeve 19, locking ring 23, pin ring 24, locking seat 18, connector 16, center pipe 1, connecting hoop 2, spring claw 3, lower joint 6, etc. The rubber cylinder 7 blocks the water layer on the one hand, and transmits thrust to the lower cone 15 on the other hand, so that the pressure is transmitted to the slip 12 through the conical surface of the lower cone 15, forcing the slip 12 to expand and firmly anchored on the casing wall to prevent the packer from moving.

[0037] The fifth step is that when it is necessary to pull out the lost pipe string after a period of production, the salvage pipe string is lowered, and a special salvage spear is connected to the lower end of the salvage pipe string. After the salvage pipe string is lowered into place, the special salvage spear enters the center pipe 1 of the packer, presses down the support body 4, cuts the control pin C5, and forces the support body 4 to move downward. Then, the pipe string is lifted, and the boss at the end of the spring claw 3 is retracted and moves upward along the inner wall of the lower joint 6. The lifting continues, and the pipe string drives the connector 16, the center pipe 1, and the lock seat 18 to move upward, and the rubber cylinder 7 is released and recovered, and the diameter becomes smaller. At the same time, the outer step at the lower part of the center pipe 1 lifts the upper cone 14 to move upward, pulls the sheath 10 upward, and forces the slip 12 to be recovered and unstuck, thereby realizing unblocking and unstuck.

[0038] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A double-anchored packer for a conventional well, comprising a central pipe (1), characterized in that: A blocking mechanism and an anchoring mechanism are connected to a position near the middle of the center tube (1); a release mechanism is connected to the lower end of the center tube (1); and a hand-release mechanism is connected to the upper end of the center tube (1); the release mechanism comprises a tie rod (2); the tie rod (2) is connected to the center tube (1) by a thread; the other end of the tie rod (2) is connected to a spring claw (3) by a thread; a support body (4) is sleeved inside the spring claw (3); the support body (4) and the spring claw (3) are connected by a control pin C (5); and a lower joint (6) is arranged outside the spring claw (3); the blocking mechanism comprises a rubber cylinder (7) and a cylinder sleeve (8) fixed on the outer wall of the center tube (1); the cylinder sleeve (8) and the center tube (1) are connected in an upward and downward sliding manner; the rubber cylinder (7) is arranged outside the cylinder sleeve (8); and a seat mechanism is connected above the rubber cylinder (7).

2. A double-anchored packer for a normal production well as claimed in claim 1, characterized in that: The number of the rubber cylinders (7) outside the cylinder sleeve (8) is no less than two groups, and a spacer ring (9) is provided between two adjacent groups of rubber cylinders (7).

3. A double-anchored packer for a normal production well as claimed in claim 1, characterized in that: The anchoring mechanism comprises a sheath (10), wherein the sheath (10) is sleeved on the outside of the central tube (1), a slot (11) is provided on the side of the sheath (10), a slip (12) is provided in the slot (11), a return spring (13) is provided between the slip (12) and the sheath (10), an upper cone (14) and a lower cone (15) are provided above and below the slip (12), respectively, and the upper cone (14) and the lower cone (15) are located between the sheath (10) and The center tube (1) and the sleeve (10) and the center tube (1) are slidably connected up and down, the upper end surface and the lower end surface of the slip (12) are respectively conical structures, the upper and lower end surfaces of the slip (12) are respectively matched with the conical surfaces of the upper cone (14) and the lower cone (15) and are close together, and the conical surfaces of the upper cone (14) and the lower cone (15) are slidably connected to the upper and lower end surfaces of the slip (12), and the lower cone (15) is connected to the lower joint (6) by means of threads.

4. A double-anchored packer for a normal production well as claimed in claim 3, characterized in that: The seating mechanism comprises a connector (16), the connector (16) being sleeved on the outside of the center tube (1) and the upper end of the connector being connected to the center tube (1) by means of a thread, the lower end of the connector (16) being a cylinder sleeve (17), a lock seat (18) and a lock sleeve (19) being provided between the cylinder sleeve (17) and the center tube (1), the lock seat (18) being sleeved and connected to the center tube (1), the upper and lower ends of the lock seat (18) being provided with a piston A (20) and a piston B (21), respectively, the lock sleeve (19) and the piston A (20) being sleeved on the lock seat (18) and the lock sleeve (19) and the piston A (20) being sleeved on the lock seat (18). ), and the piston A (20) is located at the upper end of the lock sleeve (19), the piston B (21) is located at the lower end of the lock sleeve (19) and is sleeved inside the lock sleeve (19), the piston B (21) is sleeved outside the cylinder sleeve (8), and its lower end abuts against the rubber cylinder (7), the piston B (21) and the cylinder sleeve (17) of the connector (16) are connected via a control pin B (22), the cylinder sleeve (8) and the upper cone (14) are connected via a thread, and a seat locking mechanism is provided between the lock sleeve (19) and the lock seat (18).

5. A double-anchored packer for a normal production well as claimed in claim 4, characterized in that: The seat locking mechanism comprises a lock ring (23) sleeved on the outside of the lock seat (18), an outer surface of the lock ring (23) is provided with an outer thread buckle that matches the inner thread buckle on the upper end of the lock sleeve (19), a through groove is provided on the side surface of the lock ring (23) along the axial direction of the center tube (1), and a chamfer is provided on the top of the outer surface of the lock ring (23).

6. A double-anchored packer for a normal production well as claimed in claim 5, characterized in that: A pin ring (24) is arranged above the lock ring (23). The pin ring (24) is sleeved on the outside of the lock seat (18), and the pin ring (24) and the lock seat (18) are connected by a thread. The outer surface of the pin ring (24) near the bottom end adopts an inclined surface structure that gradually inclines from top to bottom toward the center tube (1), and the inner surface of the lock ring (23) near the top end adopts an inclined surface structure that matches the pin ring (24).

7. A double-anchored packer for a normal production well as claimed in claim 1 or 4, characterized in that: The release mechanism comprises an upper joint (25) arranged above the central tube (1), the upper joint (25) being sleeved in the connecting head (16), a tapered hole (26) being arranged on the side wall of the upper joint (25), a steel ball (27) being arranged in the tapered hole (26), a lower half of the steel ball (27) being arranged in a receiving groove (28) on the inner side wall of the connecting head (16), an upper side surface of the receiving groove (28) adopting an inclined surface structure so that the opening of the receiving groove (28) gradually increases, a sliding sleeve (29) being arranged in the upper joint (25), the sliding sleeve (29) being connected to the upper joint (25) by a control pin A (30), and a return groove (31) being arranged on the outer side wall of the sliding sleeve (29) on the axis corresponding to the tapered hole (26).

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