Double-anchoring packer for normal production well

Abstract

The utility model 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; the packer adopts a downward pressing and upward lifting unblocking mode, is simple in design structure, easy to process, low in cost, light and convenient, is high in success rate of a water plugging process, and can meet the functions of multi-layer plugging and the like when being matched with other packers.

Description

Technical Field

[0001] The utility model belongs to the field of oilfield regular production well mining, and particularly relates to a double-anchored packer for regular production wells. Background Art

[0002] During oilfield development, the use of a drop-type water-blocking string is often used. The main advantages are as follows: 1. It avoids replacing the packer during operations unrelated to the failure of the plugging, such as pump inspection and deepening the pump hanger, which affects crude oil production and causes unnecessary waste. 2. It avoids the creep of the string caused by the production pump pumping oil, which affects the plugging performance of the packer, shortening the effective plugging time and increasing the workload. It is more reasonable to use a drop-type water-blocking string when the water production status of the oil layer is clearly understood. At present, there are various types of water-blocking bridge plugs and packers used in production, and the main problems are as follows:

[0003] 1. Complex structure, high processing cost, difficult assembly, and high assembly failure rate;

[0004] 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.

[0005] 3. When the lifting force on the release joint is too large, it may cause mis-sealing, resulting in ineffective sealing operation. Utility Model Content

[0006] The purpose of the utility model is to solve the technical problems of the prior art such as large unlocking force, complex structure, complex assembly, low plugging success rate, and inability to meet the requirements of multi-layer drop-out plugging, thereby providing a double-anchored packer for regular production wells.

[0007] The purpose of the utility model is achieved as follows: a double-anchored sealer for commonly used wells, comprising a central tube, wherein a sealing mechanism and an anchoring mechanism are connected near the middle of the central tube, the lower end of the central tube is connected to a releasing mechanism, and the upper end of the central tube is connected to a releasing mechanism; the releasing mechanism comprises a connecting hoop, which is connected to the central tube by a thread, and the other end of the connecting hoop is connected to a spring claw by a thread, a support body is sleeved in the spring claw, and the support body and the spring claw are connected by a control pin C, and a lower joint is provided on the outside of the spring claw; the sealing mechanism comprises a rubber cylinder and a cylinder sleeve fixed on the outer wall of the central tube, the cylinder sleeve and the central tube are slidably connected up and down, the rubber cylinder is arranged on the outside of the cylinder sleeve, and a seating mechanism is connected above the rubber cylinder.

[0008] Furthermore, the number of the rubber cylinders outside the cylinder sleeve is no less than 2 groups, and a spacer ring is provided between two adjacent groups of rubber cylinders to ensure the sealing effect.

[0009] The cam is secured to the outside of the casing and is adapted to engage the cam when the casing is in a position to move relative to the center tube.

[0010] 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 provided between the cylinder sleeve and the center tube. The lock seat is sleeved and connected to the center tube, and pistons A and piston B are provided 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 cylinder sleeve, and its lower end 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 cylinder sleeve is connected to the upper cone by a thread. A seating locking mechanism is provided 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.

[0011] Furthermore, the seat locking mechanism includes a locking ring mounted on the outside of the lock seat, and an external threaded buckle is provided on the outer side of the locking ring to cooperate with the internal threaded buckle on the upper end of the locking sleeve. A through groove along the axis of the central tube is provided on the side of the locking ring, and chamfers are provided on the top of the outer side of the locking ring and the bottom of the internal threaded buckle of the locking sleeve. When the internal threaded buckle on the inner side of the locking sleeve moves to the position of the locking ring, it will engage with the external threaded buckle on the locking ring, thereby locking the locking sleeve in position to prevent the locking sleeve from retreating in the reverse direction.

[0012] Furthermore, a pin ring is provided 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. The outer surface of the pin ring near the bottom end adopts an inclined surface structure that gradually inclines toward the center tube from top to bottom, and the inner surface of the lock ring near the top adopts an inclined surface structure that matches the pin ring. 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.

[0013] Furthermore, the release mechanism includes an upper joint arranged above the central tube, the upper joint being sleeved in the connecting head, a tapered hole being provided on the side wall of the upper joint, a steel ball being provided in the tapered hole, the lower half of the steel ball being provided in the accommodating groove on the inner side wall of the connecting head, the upper side surface of the accommodating groove adopts an inclined surface structure that gradually increases the opening of the accommodating groove, a sliding sleeve is provided in the upper joint, the sliding sleeve and the upper joint are connected by a control pin A, a return groove is provided on the axis corresponding to the tapered hole on the outer side wall of the sliding sleeve, the control pin A is sheared by hitting the sliding sleeve, 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 work 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 accommodating 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 easy to operate.

[0014] Beneficial effects of the utility model:

[0015] The utility model changes the previous unsealing method of the bridge plug, adopts the unsealing method of pressing down and lifting up, changes the factors forming the unsealing force, and uses the downward impact force of the pipe string's own weight to effectively solve the unsealing problem. At the same time, the design structure is simple, easy to process, low cost, lightweight, and the success rate of the water blocking process is high. It can be matched with other packers to meet the functions of multi-layer blocking and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention or the description of the prior art. 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 any creative work.

[0017] Figure 1 The utility model is a schematic diagram of the cross-sectional structure of a double-anchor packer for conventional wells.

[0018] Description of reference numerals:

[0019] 1. Center tube; 2. Hoop; 3. Spring claw; 4. Support body; 5. Control pin C; 6. Lower joint; 7. Rubber cylinder; 8. Cylinder sleeve; 9. Spacer ring; 10. Sleeve; 11. Slotted hole; 12. Slip; 13. Return spring; 14. Upper cone; 15. Lower cone; 16. Connector; 17. Cylinder liner; 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. ​​Sleeve; 30. Control pin A; 31. Return groove. DETAILED DESCRIPTION

[0020] The following describes in detail embodiments of the present invention, 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 explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood 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 accompanying 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.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0023] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] In one embodiment of the present invention, Figure 1 As shown, a double-anchored packer for commonly used wells comprises a central tube 1, wherein a sealing mechanism and an anchoring mechanism are connected near the middle of the central tube 1, the lower end of the central tube 1 is connected with a releasing mechanism, and the upper end of the central tube 1 is connected with a releasing mechanism; the releasing mechanism comprises a connecting hoop 2, wherein the connecting hoop 2 is connected to the central tube 1 by a thread, and the other end of the connecting hoop 2 is connected to a spring claw 3 by a thread, a support body 4 is sleeved in 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 provided on the outside of the spring claw 3; the sealing mechanism comprises a rubber tube 7 and a tube sleeve 8 fixed on the outer wall of the central tube 1, the tube sleeve 8 is connected to the central tube 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 above the rubber tube 7.

[0026] In one embodiment of the present invention, Figure 1 As shown, the number of the outer rubber tubes 7 of the tube sleeve 8 is no less than 2 groups, and a spacer ring 9 is provided between two adjacent groups of rubber tubes 7 to ensure the sealing effect.

[0027] In one embodiment of the present invention, Figure 1 As shown, the anchoring mechanism includes a sheath 10, which is sleeved on the outside of the central tube 1, and a slot 11 is provided on the side of the sheath 10. A slip 12 is provided in the slot 11, and 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 upper and lower sliding manner. The upper end face and the lower end face of the slip 12 are respectively A conical mechanism is adopted, and the upper and lower end surfaces of the slip 12 respectively coincide 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 slip 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 slip 12 in the direction where the slip 12 is located, which will push the slip 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.

[0028] 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 by a thread, and the lower end of the connector 16 is a cylinder sleeve 17, and a lock seat 18 and a lock sleeve 19 are provided between the cylinder sleeve 17 and the central tube 1, and 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, and 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 and the cylinder sleeve 17 of the connector 16 are connected by a control pin B22. The cylinder sleeve 8 and the upper cone 14 are connected by a thread. A sitting and locking mechanism is provided between the lock sleeve 19 and the lock seat 18. The position of the lock sleeve 19 can be locked by the sitting and locking mechanism to prevent it from retreating in the reverse direction.

[0029] 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. The outer surface of the lock ring 23 is provided with an external thread buckle which cooperates with the internal thread buckle at the upper end of the lock sleeve 19. The side of the lock ring 23 is provided with a through groove along the axial direction of the center tube 1. The top of the outer surface of the lock ring 23 and the bottom of the internal thread buckle of the lock sleeve 19 are respectively provided with chamfers. 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 the lock sleeve 19 and preventing the lock sleeve 19 from retreating in the reverse direction.

[0030] 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 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 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.

[0031] 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 provided on the side wall of the upper joint 25, a steel ball 27 is provided in the tapered hole 26, the lower half of the steel ball 27 is provided in the receiving groove 28 of the inner wall of the connector 16, the upper side 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 provided 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, 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 work vehicle, and the inclined surface structure on the upper side of the accommodating groove 28 on the connecting head 16 can squeeze the steel ball 27 into the return groove 31 in the sliding sleeve 29. 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.

[0032] In one embodiment of the present invention, Figure 1 As shown, the packer includes upper and lower (joint) locking and releasing mechanisms, a sitting locking mechanism, a blocking mechanism, an anchoring mechanism and a releasing mechanism, wherein the upper and lower joint (end) locking and releasing mechanisms include a connector 16, a center pipe 1, a coupling 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 upper and lower ends of the center pipe 1 are provided with threads. 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 by threads, the coupling 2 is connected to the lower end of the center pipe 1 by threads, and the lower end of the coupling 2 is connected to the spring claw 3 by threads. The support body 4 is sleeved in the spring claw 3 and fixed together by the control pin C5. The spring claw 3 is designed with an outer boss at the lower end. The lower joint 6 is placed between the outer boss of the spring claw 3 and the step at the end of the coupling 2 to form a limiting relationship.

[0033] The seat locking structure is sleeved on the periphery of the central tube 1. 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. The lock seat 18 is multi-stepped, and the middle step is provided with a thread. The pin ring 24 is connected to the lock seat 18 through the thread. 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. A pin groove is provided on the periphery of the piston B21, which is fixed together with the connector 16 cylinder sleeve 17 through the control pin B22.

[0034] The sealing 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. They include a rubber cylinder 7, a cylinder sleeve 8, a spacer ring 9, an upper cone 14, slips 12, a sleeve 10, a reset spring 13 and a lower cone 15. The cylinder sleeve 8 is a stepped structure. The rubber cylinder 7 and the spacer ring 9 are sleeved on the upper stage of the cylinder sleeve 8. The outer side of the lower stage of the cylinder sleeve 8 is provided with a thread. The inner and outer walls of the upper cone 14 are cylindrical stepped structures with cylindrical steps inside and outside. The inner wall steps are provided with threads and are connected to the cylinder 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, and the slip 12 is placed in the slot 11 in the middle position 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. The lower periphery of the lower cone 15 is provided with a thread, which is connected to the lower joint 6 through the thread.

[0035] 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. 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 has stepped 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 on 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.

[0036] The utility model provides a bidirectional anchor packer for regular mining wells, wherein the connecting head 16, central pipe 1, extension hoop 2, spring claw 3, support body 4, control pin C5 and lower joint 6 form a locking and releasing mechanism, wherein the upper and lower ends of the central pipe 1 are provided with threads, the inner wall of the connecting head 16 is stepped, and the middle step is provided with threads, the upper end of the central pipe 1 is connected to the connecting head 16 by threads, the extension hoop 2 is connected to the lower end of the central pipe 1 by threads, the lower end of the extension hoop 2 is connected to the spring claw 3 by threads, the support body 4 is sleeved in the spring claw 3 and fixed together by 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 position 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, and 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.

[0037] The working process includes the following steps:

[0038] The first step is to connect a bidirectional anchor packer for a commonly used well and other supporting tools together. The connection order is: oil pipe + a bidirectional anchor packer for a commonly used well + oil pipe + other supporting tools. The bidirectional anchor packer for a commonly used well is delivered to the designed production position of the oil well through the tubing string.

[0039] 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, cutting the control pin B22. 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 slips 12 to bulge and expand outward along the conical surfaces of the upper and lower cones 15, and then close to the casing wall. As the pressure continues to increase, the slips 12 are 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 sealing. 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 it to prevent the locking sleeve 19 from retreating in the opposite direction, completing the sealing and blocking process of the packer.

[0040] The third step is to remove the setting and pressure equipment, and put two connected sucker rods into the oil pipe string. The sucker rods move downward by free fall, hit the sliding sleeve 29 of the release mechanism, shear the control pin A30, and move the sliding sleeve 29 downward. At this time, the return groove 31 on the sliding sleeve 29 is exactly 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.

[0041] The fourth step is to lower the production oil production tubing string into the production line 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, lock seat 18, connector 16, center pipe 1, connecting hoop 2, spring claw 3, lower joint 6, etc. On the one hand, the rubber cylinder 7 blocks the water layer, and on the other hand, it transmits thrust to the lower cone 15, so that the pressure is transmitted to the slips 12 through the conical surface of the lower cone 15, forcing the slips 12 to expand and firmly anchored on the casing wall to prevent the packer from moving.

[0042] In the fifth step, when it is necessary to remove the lost pipe string after a period of production, the salvage pipe string is lowered. 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 central 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, the end boss of the spring claw 3 is retracted, and moves upward along the inner wall of the lower joint 6. The lifting is continued, and the pipe string drives the connector 16, the central pipe 1, and the lock seat 18 to move upward, 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 central pipe 1 lifts the upper cone 14 to move upward, pulling the sheath 10 upward, forcing the slips 12 to be recovered and unstuck, thereby achieving unsealing and unblocking.

[0043] The above is merely a preferred embodiment of the present invention and only specifically describes the technical principles of the present invention. These descriptions are intended only to explain the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be imagined by those skilled in the art without inventive effort, shall be included within 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-drop mechanism is connected to the upper end of the center tube (1); the release mechanism comprises a hoop (2), the hoop (2) and the center tube (1) are connected by a thread, the other end of the 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 C (5), and a lower joint (6) is provided on the outside of 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 up-and-down sliding manner, the rubber cylinder (7) is provided on the outside of the cylinder sleeve (8), and the upper part of the rubber cylinder (7) is connected to the seat mechanism.

2. A dual-anchor packer for a conventional well according to claim 1, characterized in that: The number of the outer rubber cylinders (7) of 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. The dual-anchor packer for a conventional well according to claim 1, characterized in that: The anchoring mechanism comprises a sheath (10), the sheath (10) being sleeved on the outside of the central tube (1), a slot (11) being provided on the side of the sheath (10), a slip (12) being provided in the slot (11), a return spring (13) being provided between the slip (12) and the sheath (10), an upper cone (14) and a lower cone (15) being provided above and below the slip (12), respectively, the upper cone (14) and the lower cone (15) being located between the sheath (10) and The center tube (1) and the sleeve (10) and the center tube (1) are connected in an upper and lower sliding manner. The upper and lower end surfaces of the slip (12) respectively adopt a conical structure. The upper and lower end surfaces of the slip (12) respectively match and are close to the conical surfaces of the upper cone (14) and the lower cone (15). The conical surfaces of the upper cone (14) and the lower cone (15) are connected in a sliding manner to the upper and lower end surfaces of the slip (12). The lower cone (15) is connected to the lower joint (6) by a thread.

4. A dual-anchor packer for a conventional well according to claim 3, characterized in that: The locking mechanism includes a connector (16), the connector (16) is sleeved on the outside of the central tube (1) and the upper end thereof is connected to the central tube (1) by a thread, the lower end of the connector (16) is a cylinder sleeve (17), a lock seat (18) and a lock sleeve (19) are provided between the cylinder sleeve (17) and the central tube (1), the lock seat (18) is sleeved and connected to the central tube (1), the upper and lower ends of the lock seat (18) are respectively provided with a piston A (20) and a piston B (21), the lock sleeve (19) and the piston A (20) are sleeved on the lock seat (18), and the lock sleeve (19) and the piston A (20) are 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 by a control pin B (22), the cylinder sleeve (8) and the upper cone (14) are connected by a thread, and a seat locking mechanism is provided between the lock sleeve (19) and the lock seat (18).

5. A dual-anchor packer for a conventional well according to 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 thread buckle is provided on the outer surface of the lock ring (23) and matches with 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 axis direction of the center tube (1), and a chamfer is provided on the top end of the outer surface of the lock ring (23).

6. A dual-anchor packer for a conventional well according to claim 5, characterized in that: 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). 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 adopts an inclined surface structure that gradually tilts from top to bottom toward the center tube (1), and the inner surface of the lock ring (23) near the top adopts an inclined surface structure that matches the pin ring (24).

7. A dual-anchor packer for a conventional well according to 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 connector (16), a tapered hole (26) being provided on the side wall of the upper joint (25), a steel ball (27) being provided in the tapered hole (26), the lower half of the steel ball (27) being provided in a receiving groove (28) on the inner side wall of the connector (16), the upper side surface of the receiving groove (28) being provided with an inclined surface structure such that the opening of the receiving groove (28) gradually increases, a sliding sleeve (29) being provided in the upper joint (25), the sliding sleeve (29) being connected to the upper joint (25) by a control pin A (30), and a fall-back groove (31) being provided on the outer side wall of the sliding sleeve (29) on an axis corresponding to the tapered hole (26).

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