Thermal recovery packer

Abstract

The invention discloses a thermal recovery packer. A pressing cylinder is arranged on a central pipe in a sleeving mode and is arranged close to the upper end of the central pipe, a locking ring sleeve is arranged on the central pipe in a sleeving mode and is located behind the pressing cylinder, a locking ring is arranged on the central pipe in a sleeving mode and is located in the locking ring sleeve, and a connecting sleeve is arranged on the central pipe in a sleeving mode and is located behind the locking ring sleeve. By adopting the high-temperature glue barrel made of the novel composite material, the high-temperature glue barrel not only keeps good stability in a high-temperature environment, but also can still keep excellent sealing performance after temperature alternation. In addition, the special coating design on the surface of the rubber barrel effectively prevents gouges in the tripping-in process, so that the service life of the packer is prolonged, and the maintenance cost is reduced. And meanwhile, the sealing reliability is further enhanced by using the disc spring, and the stable performance of the packer under the complex formation pressure change is ensured. Through the technical improvement, the thermal recovery packer can provide more stable and efficient thermal recovery operation, so that the recovery efficiency of heavy oil reservoirs is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal recovery packers, in particular to a thermal recovery packer. Background Art

[0002] Heavy oil resources are widely distributed around the world and are difficult to exploit, so thermal oil recovery technology has become a key means to improve the recovery efficiency of heavy oil reservoirs. Thermal recovery packers are indispensable equipment in the thermal oil recovery process, and their performance directly affects the stability and efficiency of the entire oil production system.

[0003] In high temperature environments, traditional rubber sealing components are prone to softening and aging due to insufficient heat resistance, resulting in reduced sealing performance and failure to maintain good isolation effects for a long time. To solve this problem, metal sealing components are currently widely used. However, metal sealing components are prone to deformation when facing thermal stress and changes in formation pressure, which affects the sealing effect, making the isolation performance of the packer unstable, and further affecting the continuity and reliability of the entire thermal recovery operation.

[0004] Therefore, based on the above technical problems, it is necessary for technicians in this field to develop a thermal recovery packer. Summary of the invention

[0005] The object of the present invention is to provide a thermal recovery packer to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A technical solution for a thermal recovery packer, including a pressure cylinder, a central tube, a locking ring sleeve, a locking ring anti-rotation pin, a locking ring, a connecting sleeve, a shear pin, an adjusting ring, an outer shoulder guard, an inner shoulder guard, a high-temperature rubber barrel 1, a high-temperature rubber barrel 2, a high-temperature rubber barrel 3, a high-temperature rubber barrel 4, a high-temperature rubber barrel 5, a disc spring sleeve, a disc spring, a support sleeve, a slip sealing pin, an upper cone, a retaining ring 1, a slip cover, a leaf spring, a slip, a slip cover pin, a guide pin, a lower cone, a lower connecting sleeve, an unsealing outer sleeve, a lower retaining ring, a petal unsealing ring, an unsealing inner sleeve, an unsealing pin, a lower joint, an upper joint, an upper central tube, an upper piston sleeve, an upper piston, a lower piston sleeve, a lower piston, a push cylinder, an anti-rotation key, a retaining ring 2, a connecting head, a straightening spring, a lower central tube, a spring support sleeve, a snap ring back ring, a snap ring, a release pin, a locking claw, a support claw, a straightening guide block, a skeleton sealing ring, a sealing joint, a flexible short joint, a back tightening ring, a ball seat, a steel Ball, short joint, the pressure cylinder is sleeved on the center tube and is arranged near the upper end of the center tube, the locking ring sleeve is sleeved on the center tube and behind the pressure cylinder, the locking ring sleeve is sleeved on the center tube and in the locking ring sleeve, the connecting sleeve is sleeved on the center tube and behind the locking ring sleeve, the outer shoulder guard, the inner shoulder guard, high-temperature rubber barrel one, high-temperature rubber barrel two, high-temperature rubber barrel three, high-temperature rubber barrel four, and high-temperature rubber barrel five are sleeved on the center tube and behind the connecting sleeve, the disc spring sleeve is sleeved on the center tube and behind the high-temperature rubber barrel five, the disc spring sleeve is sleeved on the center tube and in the disc spring sleeve, the upper cone, the slip cover, and the lower cone are sleeved on the center tube and behind the disc spring sleeve, the slip is between the upper cone and the lower cone and is embedded in the slip cover, the lower connecting sleeve is threadedly connected to the lower cone, the unsealing inner sleeve is sleeved in the lower connecting sleeve, and the lower joint is threadedly connected to the lower connecting sleeve.

[0008] As a preferred technical solution, the upper joint is threadedly connected to the upper center tube, the upper piston is sleeved on the upper center tube, and after the upper joint, the upper piston sleeve is sleeved on the upper center tube, and outside the upper piston, it is threadedly connected to the upper joint, the lower piston sleeve is sleeved on the upper center tube, and after the upper piston sleeve, the lower piston is located in the lower piston sleeve, the push cylinder is located in the lower piston sleeve, and behind the lower piston, the connecting head is threadedly connected to the upper center tube, and behind the upper center tube, the lower center tube is threadedly connected to the connecting head, and behind the connecting head, the locking claw, the supporting claw, and the straightening guide block are sleeved on the lower center tube, the sealing joint is threadedly connected to the lower center tube, and behind the lower center tube, the retaining ring back ring and the retaining ring sleeve are arranged on the lower center tube.

[0009] As a preferred technical solution, the locking ring adopts a bidirectional structure, which can effectively prevent the rubber cylinder from retreating.

[0010] As a preferred technical solution, the high temperature glue barrel 1, high temperature glue barrel 2, high temperature glue barrel 3, high temperature glue barrel 4, and high temperature glue barrel 5 are made of new composite materials, which can have good stability in high temperature environment, ensure that the high temperature glue barrel has good sealing performance after temperature alternation, and the surface of the glue barrel is provided with a coating to ensure that the glue barrel is not damaged during the lowering process.

[0011] As a preferred technical solution, the disc spring can effectively increase the sealing reliability.

[0012] As a preferred technical solution, a guide pin is provided in the lower cone to prevent the cone from rotating.

[0013] As a preferred technical solution, the unsealing outer sleeve is connected to the unsealing inner sleeve by an unsealing pin. The unsealing inner sleeve is lifted up to cut off the unsealing pin. After the petal unsealing ring falls off, the lower cone is released and unsealing can be achieved.

[0014] As a preferred technical solution, there is a wall cavity between the upper piston and the upper center tube, which can reduce the number of pistons while increasing the thrust.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention is a thermal recovery packer, which not only maintains good stability in a high temperature environment, but also maintains excellent sealing performance after temperature changes by adopting a high-temperature rubber barrel made of a new composite material. In addition, the special coating design on the surface of the rubber barrel effectively prevents scratches during the lowering process, thereby extending the service life of the packer and reducing maintenance costs. At the same time, the use of disc springs further enhances the reliability of the seal and ensures the stable performance of the packer under complex formation pressure changes. Through these technical improvements, the thermal recovery packer of the present invention can provide more stable and efficient thermal recovery operations, thereby significantly improving the recovery efficiency of heavy oil reservoirs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the upper structure of the well retention tool of the present invention

[0018] Figure 2 It is a schematic diagram of the lower structure of the well retention tool of the present invention;

[0019] Figure 3 It is a schematic diagram of the upper structure of the service tool of the present invention;

[0020] Figure 4 It is a schematic diagram of the lower structure of the service tool of the present invention.

[0021] In the accompanying drawings: 1, pressure cylinder; 2, center tube; 3, locking ring sleeve; 4, locking ring anti-rotation pin; 5, locking ring; 6, connecting sleeve; 7, shear pin; 8, adjusting ring; 9, outer shoulder guard; 10, inner shoulder guard; 11, high temperature rubber barrel 1; 12, high temperature rubber barrel 2; 13, high temperature rubber barrel 3; 14, high temperature rubber barrel 4; 15, high temperature rubber barrel 5; 16, disc spring sleeve; 17, disc spring; 18, support sleeve; 19, slip sealing pin; 20, upper cone; 21, retaining ring 1; 22, slip cover; 23, leaf spring; 24, slip; 25, slip cover pin; 26, guide pin; 27, lower cone; 28, lower connecting sleeve; 29, unsealing jacket; 30, lower retaining ring ;31. Petal unsealing ring;32. Unsealing inner sleeve;33. Unsealing pin;34. Lower joint;35. Upper joint;36. Upper center tube;37. Upper piston sleeve;38. Upper piston;39. Lower piston sleeve;40. Lower piston;41. Push cylinder;42. Anti-rotation key;43. Retaining ring II;44. Connector;45. Righting spring;46. Lower center tube;47. Spring support sleeve;48. Snap ring back ring;49. Snap ring;50. Release pin;51. Lock claw;52. Support claw;53. Righting guide block;54. Skeleton sealing ring;55. Sealing joint;56. Flexible short section;57. Tightening ring;58. Ball seat;59. Steel ball;60. Short section. DETAILED DESCRIPTION

[0022] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the present invention provides a technical solution of a thermal recovery packer: a pressure cylinder 1 is sleeved on a central pipe 2 and is arranged close to the upper end of the central pipe 2, a locking ring sleeve 3 is sleeved on the central pipe 2 and behind the pressure cylinder 1, a locking ring 5 is sleeved on the central pipe 2 and in the locking ring sleeve 3, a connecting sleeve 6 is sleeved on the central pipe 2 and behind the locking ring sleeve 3, an outer shoulder 9, an inner shoulder 10, a high-temperature rubber barrel 1 11, a high-temperature rubber barrel 2 12, a high-temperature rubber barrel 3 13, a high-temperature rubber barrel 4 14, and a high-temperature rubber barrel 5 15 are sleeved on the central pipe 2 and in the connecting sleeve 6. After the connecting sleeve 6, the disc spring sleeve 16 is sleeved on the center tube 2, and after the high-temperature rubber barrel 15, the disc spring 17 is sleeved on the center tube 2, and in the disc spring sleeve 16, the upper cone 20, the cava cover 22, and the lower cone 27 are sleeved on the center tube 2, and after the disc spring sleeve 16, the cava 24 is between the upper cone 20 and the lower cone 27, and is embedded in the cava cover 22, the lower connecting sleeve 28 is threadedly connected to the lower cone 27, the unsealing inner sleeve 32 is sleeved in the lower connecting sleeve 28, and the lower joint 34 is threadedly connected to the lower connecting sleeve 28.

[0024] Among them, the upper joint 35 is threadedly connected to the upper center tube 36, the upper piston 38 is sleeved on the upper center tube 36, and behind the upper joint 35, the upper piston sleeve 37 is sleeved on the upper center tube 36, and outside the upper piston 38, it is threadedly connected to the upper joint 35, the lower piston sleeve 39 is sleeved on the upper center tube 36, and behind the upper piston sleeve 37, the lower piston 40 is located in the lower piston sleeve 39, the push cylinder 41 is located in the lower piston sleeve 39, and behind the lower piston 40, the connecting head 44 is threadedly connected to the upper center tube 36, and behind the upper center tube 36, the lower center tube 46 is threadedly connected to the connecting head 44, and behind the connecting head 44, the locking claw 51, the supporting claw 52, ​​and the straightening guide block 53 are sleeved on the lower center tube 46, the sealing joint 55 is threadedly connected to the lower center tube 46, and behind the lower center tube 46, the retaining ring back ring 48 and the retaining ring 49 are sleeved on the lower center tube 46.

[0025] The locking ring 5 adopts a bidirectional structure, which can effectively prevent the rubber cylinder from retreating.

[0026] High temperature rubber barrel 1 11, high temperature rubber barrel 2 12, high temperature rubber barrel 3 13, high temperature rubber barrel 4 14, and high temperature rubber barrel 5 15 adopt new composite materials, which can have good stability in high temperature environment, ensuring that the high temperature rubber barrel has good sealing performance after temperature alternation, and the surface of the rubber barrel is coated to ensure that the rubber barrel will not be damaged during the lowering process.

[0027] The disc spring 17 can effectively increase the sealing reliability.

[0028] A guide pin 26 is arranged in the lower cone 27 to prevent the cone from rotating.

[0029] The unsealing outer sleeve 29 is connected to the unsealing inner sleeve 32 via an unsealing pin 33. The unsealing inner sleeve 32 is lifted up to cut off the unsealing pin 33. After the petal unsealing ring 31 falls off, the lower cone 27 is released and unsealed.

[0030] There is a wall cavity between the upper piston 38 and the upper center tube 36, which can reduce the number of pistons and increase the thrust.

[0031] Under normal working conditions, high-temperature rubber barrels 1 to 5 11-15 maintain good stability in high temperature environments and can still maintain excellent sealing performance after temperature changes. The special coating design on the surface of the rubber barrel effectively prevents bumps during the lowering process. The bidirectional structure of the lock ring sleeve 3 and the lock ring 5 can effectively prevent the rubber barrel from retreating and ensure the stability and sealing of the packer. The disc spring 17 in the disc spring sleeve 16 can effectively increase the sealing reliability and ensure the stable performance of the packer under complex formation pressure changes. A guide pin 26 is provided in the lower cone 27 to prevent the cone from rotating and ensure the correct operation of the packer. The unsealing inner sleeve 32 is connected to the unsealing outer sleeve 29 through an unsealing pin 33. The unsealing inner sleeve is lifted up to cut off the unsealing pin. After the petal unsealing ring 31 falls off, the lower cone 27 can be released and unsealed. A clamping wall cavity is provided between the upper piston 38 and the upper center pipe 36, which can reduce the number of pistons while increasing the thrust.

[0032] The thermal recovery packer is lowered into the predetermined oil well position through the drill pipe. Pressure is applied to the packer through the ground equipment, so that the high-temperature rubber barrel 11-15 expands and fits tightly to the well wall to achieve isolation. When it is necessary to release the isolation, the release inner sleeve 32 is lifted up, the release pin 33 is cut off, and the petal release ring 31 falls off, and the lower cone 27 is released, thereby releasing the isolation.

[0033] Through the above embodiments, the thermal recovery packer of the present invention can provide a more stable and efficient thermal recovery operation, and significantly improve the recovery efficiency of heavy oil reservoirs.

[0034] The working principle and use process of the present invention: After assembling the various components of the present solution in sequence, work in accordance with the above implementation methods in sequence according to actual needs to complete all the working steps.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0036] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; 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. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0038] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal recovery packer, It is characterized in that The invention comprises a pressure cylinder (1), a center tube (2), a locking ring sleeve (3), a locking ring anti-rotation pin (4), a locking ring (5), a connecting sleeve (6), a shear pin (7), an adjusting ring (8), an outer shoulder guard (9), an inner shoulder guard (10), a high temperature rubber barrel (11), a high temperature rubber barrel (12), a high temperature rubber barrel (13), a high temperature rubber barrel (14), a high temperature rubber barrel (15), a disc spring sleeve (16), a disc spring (17), a supporting sleeve (18), a slip seal pin (19), an upper cone (20), a retaining ring (21), a slip cover (22), a leaf spring (23), a slip (24), a slip cover pin (25), a guide pin (26), a lower cone (27), and a lower connecting sleeve (28). ), unsealing outer sleeve (29), lower retaining ring (30), petal unsealing ring (31), unsealing inner sleeve (32), unsealing pin (33), lower joint (34), upper joint (35), upper center tube (36), upper piston sleeve (37), upper piston (38), lower piston sleeve (39), lower piston (40), push cylinder (41), anti-rotation key (42), retaining ring II (43), connector (44), straightening spring (45), lower center tube (46), spring support sleeve (47), snap ring back ring (48), snap ring (49), release pin (50), locking claw (51), supporting claw (52), straightening guide block (53), skeleton sealing ring (54), sealing joint (55 ), a flexible short joint (56), a back tightening ring (57), a ball seat (58), a steel ball (59), a short joint (60), the pressing cylinder (1) is sleeved on the central tube (2), and is arranged close to the upper end of the central tube (2), the locking ring sleeve (3) is sleeved on the central tube (2), and is behind the pressing cylinder (1), the locking ring (5) is sleeved on the central tube (2), and is in the locking ring sleeve (3), the connecting sleeve (6) is sleeved on the central tube (2), and behind the locking ring sleeve (3), the outer shoulder guard (9), the inner shoulder guard (10), the high temperature rubber barrel one (11), the high temperature rubber barrel two (12), the high temperature rubber barrel three (13), the high temperature rubber barrel four (14), and the high temperature rubber barrel five (15) are sleeved on the central tube ( 2), and behind the connecting sleeve (6), the disc spring sleeve (16) is sleeved on the central tube (2), and behind the high-temperature rubber barrel (15), the disc spring (17) is sleeved on the central tube (2), and in the disc spring sleeve (16), the upper cone (20), the cava cover (22), and the lower cone (27) are sleeved on the central tube (2), and behind the disc spring sleeve (16), the cava (24) is between the upper cone (20) and the lower cone (27), and is embedded in the cava cover (22), the lower connecting sleeve (28) is threadedly connected to the lower cone (27), the unsealing inner sleeve (32) is sleeved in the lower connecting sleeve (28), and the lower joint (34) is threadedly connected to the lower connecting sleeve (28).

2. A thermal recovery packer according to claim 1, Features: The upper joint (35) is threadedly connected to the upper center tube (36); the upper piston (38) is sleeved on the upper center tube (36); after the upper joint (35) is installed, the upper piston sleeve (37) is sleeved on the upper center tube (36) and is threadedly connected to the upper joint (35) outside the upper piston (38); the lower piston sleeve (39) is sleeved on the upper center tube (36); after the upper piston sleeve (37) is installed, the lower piston (40) is located in the lower piston sleeve (39); the push cylinder (41) is located in the lower piston sleeve (39) and is threadedly connected to the upper joint (35) outside the upper piston (38); After the piston (40), the connecting head (44) is threadedly connected to the upper center tube (36), and after the upper center tube (36), the lower center tube (46) is threadedly connected to the connecting head (44), and after the connecting head (44), the locking claw (51), the supporting claw (52), and the straightening guide block (53) are sleeved on the lower center tube (46), the sealing joint (55) is threadedly connected to the lower center tube (46), and after the lower center tube (46), the retaining ring back ring (48) and the retaining ring (49) are sleeved on the lower center tube (46).

3. A thermal recovery packer according to claim 1, Features: The locking ring (5) adopts a bidirectional structure and can effectively prevent the rubber cylinder from retreating.

4. A thermal recovery packer according to claim 3, Features: The high temperature glue barrel 1 (11), high temperature glue barrel 2 (12), high temperature glue barrel 3 (13), high temperature glue barrel 4 (14), and high temperature glue barrel 5 (15) are made of new composite materials, which can have good stability in a high temperature environment, ensuring that the high temperature glue barrel still has good sealing performance after temperature changes, and the surface of the glue barrel is provided with a coating to ensure that the glue barrel is not damaged during the lowering process.

5. A thermal recovery packer according to claim 4, Features: The disc spring (17) can effectively increase the sealing reliability.

6. A thermal recovery packer according to claim 2, Features: The lower cone (27) is provided with a guide pin (26) to prevent the cone from rotating.

7. A thermal recovery packer according to claim 2, Features: The unsealing outer sleeve (29) is connected to the unsealing inner sleeve (32) via an unsealing pin (33). The unsealing inner sleeve (32) is lifted up to cut off the unsealing pin (33). After the petal unsealing ring (31) falls off, the lower cone (27) is released and can be unsealed.

8. A thermal recovery packer according to claim 2, Features: A wall cavity is provided between the upper piston (38) and the upper center tube (36), which can reduce the number of pistons and increase thrust at the same time.

Images