A carbon dioxide injection packer

Abstract

The present invention belongs to the technical field of packers, and particularly relates to a carbon dioxide injection packer. The object of the present invention is to provide a carbon dioxide injection packer that can select a release method at the construction site, has drillable and retrievable functions, has few sealing points, and high reliability. The technical solution is: a carbon dioxide injection packer, including a central tube, an upper joint is provided on the upper side of the central tube, a combined seal is installed on the lower side inside the upper joint, and an end connection tube is fixedly connected to the lower side of the central tube. The carbon dioxide injection packer provided by the present invention can adjust the release method at the construction site, and the carbon dioxide injection packer can be adjusted into a permanent packer and a pull-up release packer, and the adjustment method is simple. When adjusted into a permanent packer, only the external release shear pin needs to be removed. When adjusted into a pull-up release packer, only the internal release shear pin and the internal release sleeve need to be removed.

Description

Technical Field

[0001] The present invention belongs to the technical field of packers, and in particular relates to a carbon dioxide injection packer. Background Art

[0002] Carbon dioxide gas has a corrosive effect on downhole tubing and packers. During conventional carbon dioxide injection operations in oil fields, problems such as packer unsealing, poor packer setting, or difficulty in pulling out the tubing are prone to occur.

[0003] Therefore, the oil field urgently needs to develop and apply releasable permanent packers, which can adjust the resealing method at the construction site, and have fewer sealing points and reliable performance.

[0004] Therefore, a carbon dioxide injection packer is developed to solve the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of conventional CO2 injection operations in oil fields, such as packer unsealing, poor packer setting, or difficulty in pulling out the tubing string, the present invention aims to provide a CO2 injection packer with selectable unsealing methods at the construction site, the ability to drill and fish, few sealing points, and high reliability.

[0006] The technical solution of the present invention is: a carbon dioxide injection sealer, comprising a central tube, an upper joint is provided on the upper side of the central tube, a combined seal is installed on the lower side of the upper joint, an end tube is fixedly connected to the lower side of the central tube, an intermediate fixed piston is fixedly connected to the outer layer of the upper side of the end tube, a lower joint is fixedly connected to the outer layer of the lower joint, a lower end cap is fixedly connected to the upper side of the outer layer of the lower joint, and an end fixed piston is fixedly connected to the upper side of the outer layer of the lower joint; an external unsealing component is provided between the upper outer layer of the central tube and the outer layer of the upper joint, the external unsealing component is used to switch the sealing state, an internal unsealing component is provided on the upper inner layer of the central tube, and the internal unsealing component is fixedly provided on the The assembly is used to release the sealing state; a movable assembly is provided between the outer unsealing assembly and the upper middle side of the outer layer of the central tube, an anchoring assembly is provided inside the movable assembly, and the movable assembly is used to control the anchoring assembly to enter the anchoring and unanchoring states; a sealing assembly is provided in the middle of the outer layer of the central tube, the sealing assembly is connected to the movable assembly, and the sealing assembly is used for sealing; a driving assembly is provided on the lower side of the outer layer of the central tube, the driving assembly is connected to the sealing assembly, and the driving assembly is used to control the sealing assembly to enter the sealing and unsealing states; a salvage tool is extended into the upper joint, and the salvage tool is used to unseal the inner unsealing assembly.

[0007] In one embodiment, the outer unsealing component includes an external unsealing sleeve. The inner layer of the upper side of the external unsealing sleeve is connected to the outer layer of the lower side of the upper joint. The external unsealing sleeve and the upper joint are connected with reverse threads. A reverse-throwing releasing shear pin is screwed into the upper side of the external unsealing sleeve, and the reverse-throwing releasing shear pin is screwed into the wall of the upper joint. An external unsealing shear pin is screwed into the lower side of the external unsealing sleeve, and the external unsealing shear pin is screwed into the wall of the central pipe. The external unsealing sleeve is connected to the movable component.

[0008] In one embodiment, the inner unsealing component includes an internal unsealing sleeve. The internal unsealing sleeve is slidably sleeved on the upper side of the inner layer of the central pipe. An internal unsealing shear pin is screwed into the lower side of the internal unsealing sleeve, and the internal unsealing shear pin is screwed into the wall of the central pipe.

[0009] In one embodiment, the movable component includes a slip socket. The slip socket is located at the outer layer position of the upper middle part of the central pipe. The slip socket has a structure with holes on its surface. A slip socket end cap is fixedly connected to the upper side of the slip socket. An upper cone is slidably sleeved between the outer layer of the central pipe and the slip socket end cap. The outer layer of the upper side of the upper cone is fixedly connected to the inner layer of the lower side of the external unsealing sleeve. The external unsealing shear pin passes through the upper side of the upper cone and is screwed into the wall of the central pipe. A lower cone is slidably sleeved between the inner layer of the lower side of the slip socket and the outer layer of the central pipe. The lower cone is connected to the sealing component. A fixing shear pin is screwed into the lower cone, and the fixing shear pin is screwed into the wall of the central pipe.

[0010] In one embodiment, the anchoring component includes a reset elastic member. A reset elastic member is fixedly connected to the middle part of the inner layer of the slip socket, and an anchoring slip is fixedly connected to the inner layer of the reset elastic member.

[0011] In one embodiment, the sealing component includes an upper pressure ring. The inner layer of the upper pressure ring is fixedly connected to the outer layer of the lower side of the lower cone. The upper pressure ring is slidably sleeved on the outer layer of the central pipe. A hard rubber cylinder, a soft rubber cylinder and a lower pressure ring are respectively slidably sleeved on the outer layer of the central pipe. The lower pressure ring is connected to the driving component.

[0012] In one embodiment, the driving component includes an end cylinder. The inner layer of the lower side of the end cylinder is slidably sleeved on the outer layer of the lower end cap. The inner layer of the upper side of the end cylinder is fixedly connected with a main driving piston (132). The inner layer of the main driving piston is slidably sleeved on the outer layer of the end connection pipe. A starting shear pin is screwed into the upper side of the end fixing piston, and the starting shear pin is screwed into the wall of the main driving piston. The outer layer of the upper side of the main driving piston is fixedly connected with a front cylinder. The inner layer of the upper side of the front cylinder is fixedly connected with a driven piston. The driven piston is slidably sleeved on the outer layer of the central pipe. The outer layer of the upper side of the driven piston is fixedly connected to the inner layer of the lower side of the pressing ring. A setting locking spring is fixedly connected to the outer layer of the central pipe near the position of the pressing ring.

[0013] In one embodiment, the fishing tool includes a connecting pipe for extending into the upper joint. The lower end of the connecting pipe is fixedly connected with a split claw spring, and a raised layer is provided at the split claw spring.

[0014] Beneficial effects: 1. The carbon dioxide injection packer provided by the present invention can adjust the unsealing method at the construction site, and can adjust the carbon dioxide injection packer into a permanent packer and a pull-up unsealing packer. The adjustment method is simple. When adjusting it into a permanent packer, only the external unsealing shear pin needs to be removed. When adjusting it into a pull-up unsealing packer, only the internal unsealing shear pin and the internal unsealing sleeve need to be removed. And when it is necessary to unseal the carbon dioxide injection packer in two states, there are independent unsealing methods.

[0015] 2. Through structural improvement, the present invention realizes the optional unsealing function of the carbon dioxide injection packer, and the unsealing operation is also simple and fast, which can improve work efficiency and effectively solve the problem of cumbersome procedures during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the first three-dimensional structure schematic diagram of the present invention.

[0017] Figure 2 It is the second three-dimensional structure schematic diagram of the present invention.

[0018] Figure 3 It is the three-dimensional structure schematic diagram of the external unsealing component part of the present invention.

[0019] Figure 4 It is the three-dimensional structure schematic diagram of the central pipe part of the present invention.

[0020] Figure 5 It is the three-dimensional structure schematic diagram of the movable component part of the present invention.

[0021] Figure 6 It is the three-dimensional structure schematic diagram of the anchoring component part of the present invention.

[0022] Figure 7 This is a schematic perspective view of the sealing component part of the present invention.

[0023] Figure 8 This is a schematic perspective view of the driving component part of the present invention.

[0024] Figure 9 This is the first schematic perspective view of the fishing tool part of the present invention.

[0025] Figure 10 This is the second schematic perspective view of the fishing tool part of the present invention.

[0026] Figure 11 This is a schematic perspective view of the valve-opening claw spring part of the present invention.

[0027] In the figure, the markings are: 1 - central tube, 2 - upper joint, 3 - combined seal, 4 - end connection tube, 41 - intermediate fixed piston, 5 - lower joint, 6 - lower end cap, 7 - end fixed piston, 8 - external unsealing component, 9 - internal unsealing component, 10 - movable component, 11 - anchoring component, 12 - sealing component, 13 - driving component, 14 - fishing tool, 81 - external unsealing sleeve, 82 - reverse-throwing and releasing shear pin, 83 - external unsealing shear pin, 91 - internal unsealing sleeve, 92 - internal unsealing shear pin, 101 - slip socket, 102 - slip socket end cap, 103 - upper cone, 104 - lower cone, 105 - fixed shear pin, 111 - reset elastic member, 112 - anchoring slip, 121 - upper pressing ring, 122 - hard rubber cylinder, 123 - soft rubber cylinder, 124 - lower pressing ring, 131 - end cylinder, 132 - main driving piston, 133 - starting shear pin, 134 - front cylinder, 135 - driven piston, 136 - setting lock spring, 141 - connecting tube, 142 - valve-opening claw spring, 143 - raised layer. Specific embodiments

[0028] The following further describes the present invention in detail in conjunction with the accompanying drawings and specific embodiments, but does not limit the protection scope and application scope of the present invention.

[0029] Example 1, as Figure 1 、 Figure 2 、 Figure 4 and Figure 9As shown, a carbon dioxide injection packer includes a central pipe 1, an upper joint 2, a combined seal 3, an end pipe 4, an intermediate fixed piston 41, a lower joint 5, a lower end cap 6, an end fixed piston 7, an external unsealing component 8, an internal unsealing component 9, a movable component 10, an anchoring component 11, a sealing component 12, a driving component 13 and a salvage tool 14. The central pipe 1 is a structure with a flap design on the upper side. The flap structure of the central pipe 1 is used for inward contraction and deformation. The outer layer of the flap on the upper side of the central pipe 1 is a structure with threads. An upper joint 2 is provided at the flap thread on the upper side of the central pipe 1. The upper joint 2 and the central pipe 1 are fixedly connected by the flap thread. The upper joint 2 is used to connect the oil pipe into the well. The lower side of the upper joint 2 is installed with The combined seal 3, the inner layer of the combined seal 3 is slidably mounted on the outer layer of the upper side of the central tube 1, the lower side of the central tube 1 is fixedly connected to the end tube 4 by threads, the lower side of the end tube 4 is a structure with a pressure hole, the upper outer layer of the end tube 4 is fixedly connected to the middle fixed piston 41, the lower outer layer of the end tube 4 is fixedly connected to the lower joint 5 by threads, the lower joint 5 is used to connect the oil pumping pipe in the well, the space within the upper joint 2, the central tube 1, the end tube 4 and the lower joint 5 constitutes an oil pumping passage, the outer layer of the lower joint 5 is fixedly connected to the lower end cap 6 by threads, the upper side of the outer layer of the lower joint 5 is fixedly connected to the end fixed piston 7 by threads; an external unsealing component 8 is provided between the upper outer layer of the central tube 1 and the outer layer of the upper joint 2, the external unsealing component 8 For switching the sealing state, an inner unsealing component 9 is provided on the inner layer of the upper side of the central pipe 1, and the inner unsealing component 9 is used to release the sealing state. A movable component 10 is provided between the outer unsealing component 8 and the middle and upper side of the outer layer of the central pipe 1. An anchoring component 11 is provided inside the movable component 10. The movable component 10 is used to control the anchoring component 11 to enter the anchoring and unanchoring states. A sealing component 12 is provided in the middle of the outer layer of the central pipe 1. The sealing component 12 is connected to the movable component 10. The sealing component 12 is used for sealing. A driving component 13 is provided on the lower side of the outer layer of the central pipe 1. The driving component 13 is connected to the sealing component 12. The driving component 13 is used to control the sealing component 12 to enter the sealing and unsealing states. A salvage tool 14 is inserted into the upper joint 2 , the salvage tool 14 is used to unseal the inner unsealing component 9; pressurized oil is input from the central pipe 1 into the driving component 13 through the pressure hole structure of the end pipe 4, so that the driving component 13 pushes the sealing component 12 into a sealed state, and then the movable component 10 is operated through the sealing component 12, so that the movable component 10 drives the anchoring component 11 to enter an anchoring state, thereby achieving the purpose of setting the carbon dioxide injection packer; the wellbore tubing connected to the upper joint 2 is lifted, so that the upper joint 2 drives the movable component 10 to move upward through the external unsealing component 8, so that the movable component 10 drives the anchoring component 11 to release the anchoring state, and then the sealing component 12 enters an unsealing state, thereby achieving the purpose of lifting and unsealing the carbon dioxide injection packer;Disconnect the connection between the outer unsealing component 8 and the central tube 1. Insert the fishing tool 14 into the inner unsealing component 9 from the downhole tubing connected to the upper sub 2 for mating. Disconnect the connection between the inner unsealing component 9 and the central tube 1 and lift it out of the well. Rotate the downhole tubing connected to the upper sub 2 to disconnect the upper sub 2 from the outer unsealing component 8 and the central tube 1, so that the upper sub 2 and the downhole tubing connected to it can be lifted out of the well, leaving the carbon dioxide injection packer body in the well, and realizing the use of the carbon dioxide injection packer as a permanent packer.

[0030] As Figure 2 - Figure 3 shown, the outer unsealing component 8 includes an external unsealing sleeve 81, a reverse-thread releasing shear pin 82 and an external unsealing shear pin 83. The inner layer of the upper side of the external unsealing sleeve 81 is threadedly connected to the outer layer of the lower side of the upper sub 2. The external unsealing sleeve 81 and the upper sub 2 are connected with reverse threads. The reverse-thread releasing shear pin 82 is screwed into the upper side of the external unsealing sleeve 81, and the reverse-thread releasing shear pin 82 is screwed into the wall of the upper sub 2. The external unsealing shear pin 83 is screwed into the lower side of the external unsealing sleeve 81, and the external unsealing shear pin 83 is screwed into the wall of the central tube 1. The external unsealing sleeve 81 is connected to the movable component 10.

[0031] As Figure 2 - Figure 3 shown, the inner unsealing component 9 includes an internal unsealing sleeve 91 and an internal unsealing shear pin 92. The internal unsealing sleeve 91 is slidably sleeved on the upper side of the inner layer of the central tube 1. The internal unsealing shear pin 92 is screwed into the lower side of the internal unsealing sleeve 91, and the internal unsealing shear pin 92 is screwed into the wall of the central tube 1.

[0032] As Figure 4 shown, the movable component 10 includes a slip sleeve 101, a slip sleeve end cap 102, an upper cone 103, a lower cone 104 and a fixing shear pin 105. The slip sleeve 101 is located at the upper outer side of the middle part of the central tube 1. The slip sleeve 101 has a structure with holes on its surface. The upper side of the slip sleeve 101 is fixedly connected to the slip sleeve end cap 102 by threads. An upper cone 103 is slidably sleeved between the outer layer of the central tube 1 and the slip sleeve end cap 102. The outer layer of the upper side of the upper cone 103 is fixedly connected to the inner layer of the lower side of the external unsealing sleeve 81 by threads. The external unsealing shear pin 83 passes through the upper side of the upper cone 103 and is screwed into the wall of the central tube 1. A lower cone 104 is slidably sleeved between the inner layer of the lower side of the slip sleeve 101 and the outer layer of the central tube 1. The lower cone 104 is connected to the sealing component 12. A fixing shear pin 105 is screwed into the lower cone 104, and the fixing shear pin 105 is screwed into the wall of the central tube 1.

[0033] As Figure 4 - Figure 5As shown, the anchoring component 11 includes a reset elastic member 111 and an anchoring slip 112. In the middle of the inner layer of the slip sleeve 101, a reset elastic member 111 is fixedly connected. The reset elastic member 111 is a spring. The inner layer of the reset elastic member 111 is fixedly connected with an anchoring slip 112. The anchoring slip 112 is conical. The anchoring slip 112 can protrude outward under the relative extrusion of the upper cone 103 and the lower cone 104, so that the anchoring slip 112 protrudes through the opening structure of the slip sleeve 101 to perform the anchoring work of the packer.

[0034] As Figure 6 As shown, the sealing component 12 includes an upper pressing ring 121, a hard rubber cylinder 122, a soft rubber cylinder 123 and a lower pressing ring 124. The inner layer of the upper pressing ring 121 is fixedly connected to the outer layer of the lower side of the lower cone 104 by threads. The upper pressing ring 121 is slidably sleeved on the outer layer of the central tube 1. The outer layer of the central tube 1 is slidably sleeved with a hard rubber cylinder 122, a soft rubber cylinder 123 and a lower pressing ring 124 respectively. The upper pressing ring 121, the hard rubber cylinder 122, the soft rubber cylinder 123 and the lower pressing ring 124 are in contact with each other. The lower pressing ring 124 is connected to the driving component 13. When the lower pressing ring 124 moves upward, the hard rubber cylinder 122, the soft rubber cylinder 123 and the upper pressing ring 121 can be mutually extruded, so that the hard rubber cylinder 122 and the soft rubber cylinder 123 are compressed and deformed outward, and the hard rubber cylinder 122 and the soft rubber cylinder 123 form the sealing work of the packer.

[0035] As Figure 7 As shown, the driving component 13 includes an end cylinder 131, a main driving piston 132, a starting shear pin 133, a front cylinder 134, a driven piston 135 and a setting lock spring 136. The inner layer of the lower side of the end cylinder 131 is slidably sleeved on the outer layer of the lower end cap 6. The inner layer of the upper side of the end cylinder 131 is fixedly connected with a main driving piston 132 by threads. The inner layer of the main driving piston 132 is slidably sleeved on the outer layer of the end connecting pipe 4. The pressurized oil input from the central tube 1 enters between the main driving piston 132 and the end fixed piston 7 through the pressure hole structure of the end connecting pipe 4, so that the input oil pushes the main driving piston 132 to move upward. A starting shear pin 133 is screwed into the upper side of the end fixed piston 7. The starting shear pin 133 is screwed into the wall of the main driving piston 132. The outer layer of the upper side of the main driving piston 132 is fixedly connected with a front cylinder 134 by threads. The inner layer of the upper side of the front cylinder 134 is fixedly connected with a driven piston 135 by threads. The driven piston 135 is slidably sleeved on the outer layer of the central tube 1. The outer layer of the upper side of the driven piston 135 is fixedly connected to the inner layer of the lower side of the lower pressing ring 124 by threads. The lower layer of the inside of the driven piston 135 has a structure with a locking groove on the lower side. A setting lock spring 136 is fixedly connected to the outer layer of the central tube 1 near the lower pressing ring 124 by threads. The setting lock spring 136 can cooperate with the locking groove structure of the driven piston 135.

[0036] As Figure 9 - Figure 11As shown, the fishing tool 14 includes a connecting pipe 141, a split-claw spring 142, and a raised layer 143. The connecting pipe 141 is used to extend into the upper joint 2. The connecting pipe 141 is made of hard pipe material, and the diameter of the connecting pipe 141 is smaller than that of the tubing in the well. The lower end of the connecting pipe 141 is fixedly connected with a split-claw spring 142. The split-claw spring 142 is a hollow structure and a hollow-out structure. The hollow-out structure of the split-claw spring 142 is used to generate deformation. Raised layers 143 are provided at the surface layer of the hollow-out structure of the split-claw spring 142. The raised layers 143 are used to catch the lower end face of the built-in release sleeve 91.

[0037] Embodiment 2, as Figure 1 - Figure 11 shown, the assembly method of this carbon dioxide injection packer: Connect the end of the hard tubing in the well to the upper joint 2, and then connect the hard draw tubing and its check valve to the lower joint 5.

[0038] The adjustment method of this carbon dioxide injection packer: The sealing method of this carbon dioxide injection packer is divided into a permanent packer and a pull-up release packer. The carbon dioxide injection packer can be adjusted according to needs at the construction site. The adjustment method of this carbon dioxide injection packer is as follows: ① When used as a permanent packer, remove the external release shear pin 83. ② When used as a pull-up release packer, remove the built-in release sleeve 91 and the built-in release shear pin 92.

[0039] The setting process of this CO₂ injection packer is as follows: After the adjustment of this CO₂ injection packer is completed: ① Assembly and lowering into the well: First, lower the sucker rod into the well, and the CO₂ injection packer will drive the connected tubing into the well; ② Pressurization: Input pressurized oil into the central pipe 1 through the tubing in the well, and the pressurized oil will be input between the main drive piston 132 and the end fixed piston 7 through the pressure passage structure of the end connection pipe 4; ③ Unlocking: The input oil pushes the main drive piston 132 to have an upward movement tendency, causing the starting shear pin 133 to be sheared and disconnected, and the input oil pushes the main drive piston 132 upward; ④ The main drive piston 132 will drive the end cylinder 131 and the front cylinder 134 upward, and the front cylinder 134 will drive the driven piston 135 upward; ⑤ Sealing: The driven piston 135 will drive the lower pressing ring 124 upward, and then the lower pressing ring 124 will squeeze the hard rubber cylinder 122 and the soft rubber cylinder 123 through the upper pressing ring 121 at a fixed position, making the hard rubber cylinder 122 and the soft rubber cylinder 123 closely adhere to the inner wall of the well to complete the sealing work of this CO₂ injection packer; ⑥ Anchoring: While the hard rubber cylinder 122 and the soft rubber cylinder 123 are gradually compressed, the thrust of the relative upward movement will drive the lower cone 104 upward, causing the lower cone 104 to cut off the fixed shear pin 105 by shear force, and the lower cone 104 will move upward to squeeze the anchoring slip 112 with a conical structure, making the anchoring slip 112 extend out of the opening structure of the slip sleeve 101 to contact the well wall. At the same time, the slip sleeve 101 and the anchoring slip 112 will also move upward, and the anchoring slip 112 will be completely closely adhered to the well wall under the combined action of the upward moving lower cone 104 and the upper cone 103 at a fixed position to complete the anchoring work of this CO₂ injection packer; ⑦ Locking: During the upward movement of the driven piston 135, after the anchoring slip 112 completes anchoring and the hard rubber cylinder 122 and the soft rubber cylinder 123 complete sealing, the driven piston 135 will make its locking groove structure buckle on the setting lock spring 136 to form a position fixation.

[0040] The releasing methods of this CO₂ injection packer: The releasing methods of this CO₂ injection packer are divided into the releasing of a permanent packer and the releasing of a packer by pulling up. The following releasing methods can be applied according to the method selected in the above "Adjustment of this CO₂ injection packer":

[0041] When releasing the permanent packer: ① Insert a fishing tool 14 into the central tube 1 through the downhole tubing. Make the opening claw spring 142 extend into the built-in release sleeve 91. The built-in release sleeve 91 will squeeze the convex layer 143 to deform the opening claw spring 142. Until the convex layer 143 is at the lower end face of the built-in release sleeve 91, the deformation reset process of the opening claw spring 142 will drive the convex layer 143 to reset, making the convex layer 143 catch the lower end face of the built-in release sleeve 91. Then pull up the connecting pipe 141, making the connecting pipe 141 drive the opening claw spring 142 and the convex layer 143 to move upward. Furthermore, the convex layer 143 will drive the built-in release sleeve 91 to have an upward movement tendency, making the built-in release sleeve 91 cut off the built-in release shear pin 92 through shear force. At this time, the connecting pipe 141, the opening claw spring 142 and the built-in release sleeve 91 can be directly lifted out of the wellhead; ② Rotate the downhole tubing, making the downhole tubing drive the upper joint 2 to rotate. The upper joint 2 cuts off the reverse-thread release shear pin 82 through shear force. Continue to rotate the downhole tubing and the upper joint 2, making the upper joint 2 loosen through the reverse-thread connection with the external release sleeve 81. While the upper joint 2 moves upward, it will compress the opening thread structure at the upper end of the central tube 1, making the upper joint 2 separate from the external release sleeve 81 and the central tube 1. At this time, the downhole tubing can be lifted, making the downhole tubing drive the upper joint 2 and the combined seal 3 to move upward and separate from the main body part of the carbon dioxide injection packer; ③ Finally, lower a milling tool into the well for milling operation to drill out the packer.

[0042] When releasing the upward-lift release packer: ① Lift the downhole tubing, making the downhole tubing drive the upper joint 2 and the external release sleeve 81 to move upward. The external release sleeve 81 cuts off the external release shear pin 83 through shear force. Continue to lift the downhole tubing, making the external release sleeve 81 drive the upper cone 103 to move upward. The upper cone 103 will drive the slip cover end cap and the slip sleeve 101 to move upward. The distance between the upper cone 103 and the lower cone 104 will reset to the state before anchoring, making the anchor slips 112 not subject to the thrust of the upper cone 103 and the lower cone 104. At this time, the reset elastic member 111 will make the anchor slips 112 reset, making the anchor slips 112 separate from the contact with the wellbore wall, completing the anchoring release during release. At this time, the lower cone 104 is not stressed, making the hard rubber cylinder 122 and the soft rubber cylinder 123 also recover from the compressed state and separate from the contact with the wellbore wall, completing the sealing release during release; ② Continue to lift the downhole tubing, and the carbon dioxide injection packer can be lifted out of the well.

[0043] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those skilled in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A carbon dioxide injection packer, characterized by: The invention comprises a central tube (1), an upper joint (2) is provided on the upper side of the central tube (1), a combined seal (3) is installed on the lower side of the upper joint (2), an end tube (4) is fixedly connected to the lower side of the central tube (1), an intermediate fixed piston (41) is fixedly connected to the upper outer layer of the end tube (4), a lower joint (5) is fixedly connected to the lower outer layer of the end tube (4), a lower end cap (6) is fixedly connected to the outer layer of the lower joint (5), and an end fixed piston (7) is fixedly connected to the upper outer layer of the lower joint (5); An external unsealing component (8) is provided between the upper outer layer of the central tube (1) and the outer layer of the upper joint (2), and the external unsealing component (8) is used to switch the sealing state; an internal unsealing component (9) is provided on the upper inner layer of the central tube (1), and the internal unsealing component (9) is used to release the sealing state; A movable component (10) is provided between the outer unsealing component (8) and the upper middle side of the outer layer of the central tube (1), an anchoring component (11) is provided inside the movable component (10), and the movable component (10) is used to control the anchoring component (11) to enter an anchoring and unanchoring state; A sealing component (12) is provided in the middle of the outer layer of the central tube (1), the sealing component (12) is connected to the movable component (10), and the sealing component (12) is used for sealing; A driving assembly (13) is provided on the lower side of the outer layer of the central tube (1), the driving assembly (13) being connected to the sealing assembly (12), and the driving assembly (13) being used to control the sealing assembly (12) to enter a sealing state and a releasing state; A salvaging tool (14) extends into the upper joint (2), and the salvaging tool (14) is used to unseal the inner unsealing component (9); The external unsealing component (8) includes an external unsealing sleeve (81), the upper inner layer of the external unsealing sleeve (81) is connected to the lower outer layer of the upper joint (2), the external unsealing sleeve (81) and the upper joint (2) are connected in a reverse threaded manner, the upper side of the external unsealing sleeve (81) is screwed with an inverted shear pin (82), the inverted shear pin (82) is screwed into the wall of the upper joint (2), the lower side of the external unsealing sleeve (81) is screwed with an external unsealing shear pin (83), the external unsealing shear pin (83) is screwed into the wall of the central tube (1), and the external unsealing sleeve (81) is connected to the movable component (10); The inner unsealing component (9) comprises an inner unsealing sleeve (91), the inner unsealing sleeve (91) is slidably mounted on the upper side of the inner layer of the central tube (1), and an inner unsealing shearing nail (92) is screwed into the lower side of the inner unsealing sleeve (91), and the inner unsealing shearing nail (92) is screwed into the wall of the central tube (1); The movable assembly (10) includes a slip sleeve (101), the slip sleeve (101) is located at the outer layer of the upper side of the central tube (1), the slip sleeve (101) is a structure with holes on the surface, the slip sleeve (101) is fixedly connected to the upper side of the slip sleeve (101) with a slip sleeve end cap (102), an upper cone (103) is slidably sleeved between the outer layer of the central tube (1) and the slip sleeve end cap (102), and the upper outer layer of the upper cone (103) is connected to the external unsealing sleeve ( 81) The lower inner layer is fixedly connected, the external unsealing shear nail (83) passes through the upper side of the upper cone (103) and is screwed into the wall of the central tube (1), a lower cone (104) is slidably mounted between the lower inner layer of the slip sleeve (101) and the outer layer of the central tube (1), the lower cone (104) is connected to the sealing assembly (12), a fixed shear nail (105) is screwed into the lower cone (104), and the fixed shear nail (105) is screwed into the wall of the central tube (1); The anchoring assembly (11) comprises a reset elastic member (111), the reset elastic member (111) is fixedly connected to the middle of the inner layer of the slip sleeve (101), and the inner layer of the reset elastic member (111) is fixedly connected to an anchoring slip (112).

2. A carbon dioxide injection packer according to claim 1, characterized in that: The sealing assembly (12) includes an upper pressure ring (121), the inner layer of the upper pressure ring (121) is fixedly connected to the outer layer of the lower side of the lower cone (104), the upper pressure ring (121) is slidably mounted on the outer layer of the central tube (1), and the outer layer of the central tube (1) is slidably mounted with a hard rubber tube (122), a soft rubber tube (123) and a lower pressure ring (124), and the lower pressure ring (124) is connected to the driving assembly (13).

3. A carbon dioxide injection packer according to claim 2, characterized in that: The driving assembly (13) comprises an end cylinder (131), wherein the inner layer of the lower side of the end cylinder (131) is slidably mounted on the outer layer of the lower end cap (6), and the inner layer of the upper side of the end cylinder (131) is fixedly connected to a main driving piston (132), wherein the inner layer of the main driving piston (132) is slidably mounted on the outer layer of the end pipe (4), and a starting shear pin (133) is screwed into the upper side of the end fixed piston (7), and the starting shear pin (133) is screwed into the main driving piston (132). Inside the wall, the upper outer layer of the main driving piston (132) is fixedly connected to the front cylinder (134), the upper inner layer of the front cylinder (134) is fixedly connected to the driven piston (135), the driven piston (135) is slidably mounted on the outer layer of the center tube (1), the upper outer layer of the driven piston (135) is fixedly connected to the lower inner layer of the lower pressure ring (124), and the outer layer of the center tube (1) is fixedly connected to a locking spring (136) at a position near the lower pressure ring (124).

4. A carbon dioxide injection packer according to claim 3, characterized in that: The salvage tool (14) comprises a connecting tube (141) for extending into the upper joint (2); a petal-opening claw spring (142) is fixedly connected to the lower end of the connecting tube (141); and a raised layer (143) is provided at each petal-opening claw spring (142).

Images