Carbon dioxide injection packer

Abstract

The invention belongs to the technical field of packers, and particularly relates to a carbon dioxide injection packer. The invention aims to provide the carbon dioxide injection packer which can select a deblocking mode on a construction site, has a drillable and salvageable function, has few sealing points and is high in reliability. According to the technical scheme, the carbon dioxide injection packer comprises a center pipe, an upper connector is arranged on the upper side of the center pipe, a combined sealing piece is installed on the lower side of the interior of the upper connector, and an end connecting pipe is fixedly connected to the lower side of the center pipe. According to the carbon dioxide injection packer, the deblocking mode can be adjusted on a construction site, the carbon dioxide injection packer can be adjusted to be a permanent packer and a lifting deblocking type packer, the adjusting mode is simple, when the carbon dioxide injection packer is adjusted to be the permanent packer, only the external deblocking shear pin needs to be detached, and when the carbon dioxide injection packer is adjusted to be the lifting deblocking type packer, the external deblocking shear pin needs to be detached. And only the built-in unsealing shear pin and the built-in unsealing sleeve need to be detached.

Description

Technical Field

[0001] The 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. In conventional carbon dioxide injection operations in oil fields, problems such as packer unsealing, poor packer seating, 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 easy packer unsealing, poor packer setting or difficulty in pulling out the pipe string in conventional carbon dioxide injection operations in oil fields, the purpose of the present invention is to provide a carbon dioxide injection packer with selectable unsealing mode on the construction site, with drillable and salvageable functions, few sealing points and high reliability.

[0006] The technical solution of the present invention is: a carbon dioxide injection packer, 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 upper outer layer of the end tube, a lower joint is fixedly connected to the lower outer layer of the end tube, a lower end cap is fixedly connected to 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 isolation state, an internal unsealing component is provided on the upper inner layer of the central tube, and the internal unsealing component is provided on the upper inner layer of the central tube. 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 external 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 reversely threaded, the upper side of the external unsealing sleeve is screwed with an inverted shear pin, the inverted shear pin is screwed into the wall of the upper joint, the lower side of the external unsealing sleeve is screwed with an external unsealing shear pin, the external unsealing shear pin is screwed into the wall of the central tube, and the external unsealing sleeve is connected to the movable component.

[0008] In one embodiment, the internal unsealing component includes an internal unsealing sleeve, which is slidably mounted on the upper side of the inner layer of the central tube, and internal unsealing shear pins are screwed into the lower side of the internal unsealing sleeve, and the internal unsealing shear pins are screwed into the central tube wall.

[0009] In one embodiment, the movable component includes a cava sleeve, which is located at the upper outer layer position of the center tube. The cava sleeve is a structure with holes on the surface. A cava sleeve end cap is fixedly connected to the upper side of the cava sleeve. An upper cone is slidably mounted between the outer layer of the center tube and the cava sleeve end cap. The upper outer layer of the upper cone is fixedly connected to the lower inner layer of the external unsealing sleeve. The external unsealing shear pin passes through the upper side of the upper cone and is screwed into the center tube wall. A lower cone is slidably mounted between the lower inner layer of the cava sleeve and the outer layer of the center tube. The lower cone is connected to the sealing assembly. Fixed shear pins are screwed into the lower cone, and the fixed shear pins are screwed into the center tube wall.

[0010] In one of the embodiments, the anchoring assembly includes a reset elastic member, a reset elastic member is fixedly connected to the middle of the inner layer of the slip sleeve, and an anchor slip is fixedly connected to the inner layer of the reset elastic member.

[0011] In one embodiment, the sealing assembly 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 mounted on the outer layer of the center tube, the outer layer of the center tube is slidably mounted with a hard rubber tube, a soft rubber tube and a lower pressure ring, and the lower pressure ring is connected to the driving assembly.

[0012] In one embodiment, the drive assembly includes an end cylinder, the lower inner layer of the end cylinder is slidably mounted on the outer layer of the lower end cap, the upper inner layer of the end cylinder is fixedly connected to a main drive piston (132), the inner layer of the main drive piston is slidably mounted on the outer layer of the end tube, a starting shear pin is screwed into the upper side of the end fixed piston, the starting shear pin is screwed into the wall of the main drive piston, the upper outer layer of the main drive piston is fixedly connected to a front cylinder, the upper inner layer of the front cylinder is fixedly connected to a driven piston, the driven piston is slidably mounted on the outer layer of the center tube, the upper outer layer of the driven piston is fixedly connected to the lower inner layer of the lower pressure ring, and a seating spring is fixedly connected to the outer layer of the center tube near the lower pressure ring.

[0013] In one of the embodiments, the salvage tool includes a connecting pipe, which is used to extend into the upper joint. The lower end of the connecting pipe is fixedly connected to a petal-opening claw spring, and the petal-opening claw spring is provided with a raised layer.

[0014] Beneficial effects: 1. The CO2 injection packer provided by the present invention can adjust the unsealing mode at the construction site. The CO2 injection packer can be adjusted to a permanent packer and a lift-up unsealing packer, and the adjustment method is simple. When adjusted to a permanent packer, it is only necessary to remove the external unsealing shear nails. When adjusted to a lift-up unsealing packer, it is only necessary to remove the internal unsealing shear nails and the internal unsealing sleeve. In addition, when it is necessary to unseal the CO2 injection packers in two states, there are independent unsealing methods.

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

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

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

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

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

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

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

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the sealing component part of the present invention.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the driving component part of the present invention.

[0024] Fig. 9 It is a schematic diagram of the first stereoscopic structure of the salvage tool part of the present invention.

[0025] Fig.10 It is a schematic diagram of a second three-dimensional structure of the salvaging tool part of the present invention.

[0026] Fig.11 It is a schematic diagram of the three-dimensional structure of the petal-opening claw spring part of the present invention.

[0027] The markings in the figure are: 1-center tube, 2-upper joint, 3-combined seal, 4-end pipe, 41-middle fixed piston, 5-lower joint, 6-lower end cap, 7-end fixed piston, 8-external unsealing assembly, 9-internal unsealing assembly, 10-movable assembly, 11-anchor assembly, 12-sealing assembly, 13-driving assembly, 14-salvage tool, 81-external unsealing sleeve, 82-inverted shear nail, 83-external unsealing shear nail, 91-internal unsealing sleeve, 92-internal unsealing shear nail, 101- Cava sleeve, 102-cava sleeve end cap, 103-upper cone, 104-lower cone, 105-fixed shear pin, 111-reset elastic member, 112-anchor cava, 121-upper pressure ring, 122-hard rubber tube, 123-soft rubber tube, 124-lower pressure ring, 131-end cylinder, 132-main driving piston, 133-starting shear pin, 134-front cylinder, 135-driven piston, 136-seating lock spring, 141-connecting pipe, 142-opening claw spring, 143-raised layer. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope and application scope of the present invention are not limited.

[0029] Embodiment 1, as Figure 1 , Figure 2 , Figure 4 and Fig. 9As shown, a carbon dioxide injection packer includes a central tube 1, an upper joint 2, a combined seal 3, an end tube 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 tube 1 is a structure with a flap design on the upper side. The flap structure of the central tube 1 is used for shrinking and deforming inward. The outer layer of the flap on the upper side of the central tube 1 is a structure with threads. An upper joint 2 is provided at the flap thread on the upper side of the central tube 1. The upper joint 2 is fixedly connected to the central tube 1 through 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 A combined seal 3, wherein 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 an end tube 4 by threads, the lower side of the end tube 4 is a structure with a pressure-through hole, the upper outer layer of the end tube 4 is fixedly connected to an intermediate fixed piston 41, the lower outer layer of the end tube 4 is fixedly connected to a 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 a lower end cap 6 by threads, the upper side of the outer layer of the lower joint 5 is fixedly connected to an 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 tube 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 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 the anchoring and unanchoring states. A sealing component 12 is provided in the middle of the outer layer of the central tube 1, and 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 tube 1, and 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 extended into the upper joint 2 , the salvage tool 14 is used to unseal the inner unsealing component 9; the 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 into an anchoring state, thereby achieving the purpose of setting the carbon dioxide injection packer; the wellbore oil pipe 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 unsealed state, thereby achieving the purpose of lifting and unsealing the carbon dioxide injection packer;The external unsealing assembly 8 is disconnected from the central pipe 1 by operating, and the fishing tool 14 is extended into the internal unsealing assembly 9 from the wellbore connected to the upper joint 2 to cooperate, and the internal unsealing assembly 9 is disconnected from the central pipe 1 and lifted out of the well, and the wellbore connected to the upper joint 2 is rotated to disconnect the upper joint 2 from the external unsealing assembly 8 and the central pipe 1, so that the wellbore connected to the upper joint 2 can be lifted out of the well, so that the main body of the carbon dioxide injection packer remains in the well, and the carbon dioxide injection packer is used as a permanent packer. ;

[0030] like Figure 2-Figure 3 As shown, the external unsealing component 8 includes an external unsealing sleeve 81, an inverted 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 joint 2. The external unsealing sleeve 81 and the upper joint 2 are reversely threaded. The inverted shear pin 82 is screwed into the upper side of the external unsealing sleeve 81, and the inverted shear pin 82 is screwed into the wall of the upper joint 2. The external unsealing sleeve 81 is screwed into the lower side of the external unsealing sleeve 81. 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.

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

[0032] like Figure 4 As shown, the movable assembly 10 includes a slip sleeve 101, a slip sleeve end cap 102, an upper cone 103, a lower cone 104 and a fixed shear nail 105. The slip sleeve 101 is located at the outer layer of the upper side of the central pipe 1. The slip sleeve 101 is a structure with holes on the surface. The slip sleeve end cap 102 is fixedly connected to the upper side of the slip sleeve 101 through a thread. The upper cone is slidably mounted between the outer layer of the central pipe 1 and the slip sleeve end cap 102. 103, the upper outer layer of the upper cone 103 is fixedly connected with the lower inner layer of the external unsealing sleeve 81 through threads, the external unsealing shear nails 83 pass through the upper side of the upper cone 103 and are screwed into the wall of the central tube 1, and the lower inner layer of the slip sleeve 101 and the outer layer of the central tube 1 are slidably mounted between the lower inner layer and the outer layer of the central tube 1. The lower cone 104 is connected to the sealing assembly 12, and fixed shear nails 105 are screwed into the lower cone 104, and the fixed shear nails 105 are screwed into the wall of the central tube 1.

[0033] like Figure 4-Figure 5As shown, the anchoring assembly 11 includes a reset elastic member 111 and an anchoring cava 112. The reset elastic member 111 is fixedly connected to the middle of the inner layer of the cava sleeve 101. The reset elastic member 111 is a spring. The inner layer of the reset elastic member 111 is fixedly connected to the anchoring cava 112. The anchoring cava 112 is conical in shape. The anchoring cava 112 can be extended outward by the relative squeezing action of the upper cone 103 and the lower cone 104, so that the anchoring cava 112 is extended through the opening structure of the cava sleeve 101 to perform the anchoring work of the packer.

[0034] like Figure 6 As shown, the sealing assembly 12 includes an upper pressure ring 121, a hard rubber tube 122, a soft rubber tube 123 and a lower pressure ring 124. 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 by threads, and the upper pressure ring 121 is slidably mounted on the outer layer of the central tube 1. The outer layer of the central tube 1 is slidably mounted with the hard rubber tube 122, the soft rubber tube 123 and the lower pressure ring 124. The upper pressure ring 121, the hard rubber tube 122, the soft rubber tube 123 and the lower pressure ring 124 are in contact with each other, and the lower pressure ring 124 is connected to the driving assembly 13. The lower pressure ring 124 moves upward to squeeze the hard rubber tube 122, the soft rubber tube 123 and the upper pressure ring 121, so that the hard rubber tube 122 and the soft rubber tube 123 are compressed and deformed toward the outer layer, so that the hard rubber tube 122 and the soft rubber tube 123 form a sealing work of the packer.

[0035] like Figure 7 As shown, the drive assembly 13 includes an end cylinder 131, a main drive piston 132, a start shear pin 133, a front cylinder 134, a driven piston 135 and a seat lock spring 136. 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 the main drive piston 132 by threads. The inner layer of the main drive piston 132 is slidably mounted on the outer layer of the end tube 4. The pressurized oil input from the central tube 1 enters between the main drive piston 132 and the end fixed piston 7 through the pressure hole structure of the end tube 4, so that the input oil pushes the main drive piston 132 to move upward, and the upper side of the end fixed piston 7 is screwed into Start the shear pin 133, which is screwed into the wall of the main driving piston 132. The upper outer layer of the main driving piston 132 is fixedly connected to the front cylinder 134 by a thread, and the upper inner layer of the front cylinder 134 is fixedly connected to the driven piston 135 by a thread. The driven piston 135 is slidably mounted on the outer layer of the center tube 1, and the upper outer layer of the driven piston 135 is fixedly connected to the lower inner layer of the lower pressure ring 124 by a thread. The lower layer inside the driven piston 135 is a structure with a locking groove on the lower side, and a seating spring 136 is fixedly connected to the outer layer of the center tube 1 near the lower pressure ring 124 by a thread, and the seating spring 136 can cooperate with the locking groove structure of the driven piston 135.

[0036] like Figure 9-11As shown, the salvage tool 14 includes a connecting pipe 141, a petal-opening claw spring 142 and a protruding layer 143. The connecting pipe 141 is used to extend into the upper joint 2. The connecting pipe 141 is made of a hard pipe. The diameter of the connecting pipe 141 is smaller than the oil pipe going into the well. The lower end of the connecting pipe 141 is fixedly connected with the petal-opening claw spring 142. The petal-opening claw spring 142 is a hollow structure. The petal-opening claw spring 142 is a hollow structure. The hollow structure of the petal-opening claw spring 142 is used to generate deformation. The surface layer of the hollow structure of the petal-opening claw spring 142 is provided with a protruding layer 143. The protruding layer 143 is used to clamp the lower end face of the built-in unsealing sleeve 91.

[0037] Embodiment 2, as Figure 1-Figure 11 As shown, the assembly method of the carbon dioxide injection packer is as follows: the end of the hard wellbore oil pipe is connected to the upper joint 2, and then the hard oil pumping pipe and its one-way valve are connected to the lower joint 5.

[0038] Adjustment method of the CO2 injection packer: The CO2 injection packer has two isolation methods: a permanent packer and a lift-up unsealing packer. The CO2 injection packer can be adjusted as needed at the construction site. The adjustment method of the CO2 injection packer is as follows: ① When used as a permanent packer, the external unsealing shear nail 83 is disassembled. ② When used as a lift-up unsealing packer, the internal unsealing sleeve 91 and the internal unsealing shear nail 92 are disassembled.

[0039] The setting process of the carbon dioxide injection packer is as follows: after the adjustment of the carbon dioxide injection packer is completed: ① assembly into the well: the pumping pipe is first sent into the well, so that the carbon dioxide injection packer drives the connected wellbore oil pipe into the well; ② pressurization: pressurized oil is input into the center pipe 1 through the wellbore oil pipe, so that the pressurized oil is input into the main drive piston 132 and the end fixed piston 7 through the pressure hole structure of the end pipe 4; ③ unlocking: the input oil pushes the main drive piston 132 to have a tendency to move upward to enable the starter The dynamic shear pin 133 is disconnected by the shear force, so that the input oil pushes the main driving piston 132 to move upward; ④ The main driving piston 132 will drive the end cylinder 131 and the front cylinder 134 to move upward, and the front cylinder 134 will drive the driven piston 135 to move upward; ⑤ Sealing: The driven piston 135 will drive the lower pressure ring 124 to move upward, and then the lower pressure ring 124 will squeeze the hard rubber tube 122 and the soft rubber tube 123 through the upper pressure ring 121 at a fixed position, so that the hard rubber tube 122 and the soft rubber tube 123 Closely attached to the well wall, the sealing work of the CO2 injection packer is completed; ⑥ Anchoring: While the hard rubber tube 122 and the soft rubber tube 123 are gradually compressed, the thrust of the relative upward movement will drive the lower cone 104 to move upward, so that the lower cone 104 cuts off the fixed shear nail 105 through shear force, so that the lower cone 104 moves upward to squeeze the anchoring slip 112 with a cone structure, so that the anchoring slip 112 extends out of the opening structure of the slip sleeve 101 and contacts the well wall, and at the same time the slip sleeve 101 and the anchoring slip 1 12 will also move upward, so that the anchoring slip 112 will be completely close to the well wall through the cooperation of the lower cone 104 moving upward and the upper cone 103 in the fixed position, completing the anchoring work of the carbon dioxide injection packer; ⑦ Locking: During the upward movement of the driven piston 135, the anchoring slip 112 is anchored, and after the hard rubber tube 122 and the soft rubber tube 123 are sealed, the driven piston 135 will buckle its locking groove structure on the seating spring 136 to fix its position.

[0040] Unsealing methods of the CO2 injection packer: The unsealing methods of the CO2 injection packer are divided into permanent packer unsealing and lifting packer unsealing. The following unsealing methods can be applied according to the method selected in the above-mentioned "Adjustment of the CO2 injection packer":

[0041] When the permanent packer is unsealed: ① insert the fishing tool 14 into the central pipe 1 through the wellbore tubing, so that the petal-opening claw spring 142 extends into the built-in unsealing sleeve 91, and the built-in unsealing sleeve 91 squeezes the protruding layer 143 to deform the petal-opening claw spring 142, until the protruding layer 143 is at the lower end surface of the built-in unsealing sleeve 91, the deformation and reset process of the petal-opening claw spring 142 drives the protruding layer 143 to reset, so that the protruding layer 143 is stuck to the lower end surface of the built-in unsealing sleeve 91, and then the connecting pipe 141 is pulled upward, so that the connecting pipe 141 drives the petal-opening claw spring 142 and the protruding layer 143 to move upward, and then the protruding layer 143 drives the built-in unsealing sleeve 91 to move upward, so that the built-in unsealing sleeve 91 pushes the built-in unsealing shear nail 92 through shear force. ① Cut off, at this time, the connecting pipe 141, the opening claw spring 142 and the built-in release sleeve 91 can be directly lifted up from the wellhead; ② Rotate the downhole tubing to make the downhole tubing drive the upper joint 2 to rotate, and the upper joint 2 cuts off the inverted shear nail 82 through shear force, and continue to rotate the downhole tubing and the upper joint 2 to make the upper joint 2 loosen through the reverse thread connection with the external release sleeve 81, and the upper joint 2 moves upward while compressing the opening flap thread structure at the upper end of the central pipe 1, so that the upper joint 2 is separated from the external release sleeve 81 and the central pipe 1. At this time, the downhole tubing can be lifted up, so that the downhole tubing drives the upper joint 2 and the combined seal 3 to move upward and separate from the main part of the carbon dioxide injection packer; ③ Finally, a milling tool is lowered from the well to perform milling operations to drill out the packer.

[0042] When the lifting and unsealing packer is unsealed: ① lift the wellbore tubing, so that the wellbore tubing drives the upper joint 2 and the external unsealing sleeve 81 to move upward, so that the external unsealing sleeve 81 cuts off the external unsealing shear nail 83 through shear force, and continues to lift the wellbore tubing, so that the external unsealing sleeve 81 drives the upper cone 103 to move upward, and the upper cone 103 will drive the slip cover end cap and the slip sleeve 101 to move upward, and the distance between the upper cone 103 and the lower cone 104 will be reset to the state before anchoring, so that the anchoring The slip 112 is not subjected to the thrust of the upper cone 103 and the lower cone 104. At this time, the reset elastic member 111 will reset the anchor slip 112, so that the anchor slip 112 will break away from the contact with the well wall, and the anchoring release during unsealing will be completed. At this time, the lower cone 104 is not subjected to force, so that the hard rubber tube 122 and the soft rubber tube 123 will also recover from the compressed state and break away from the contact with the well wall, and the sealing release during unsealing will be completed. ② Continue to lift the wellbore tubing, and the carbon dioxide injection packer can be lifted out of the well.

[0043] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A carbon dioxide injection packer, characterized in that: The invention comprises a central tube (1), wherein 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 middle upper 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 state and an 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 component (13) is provided on the lower side of the outer layer of the central tube (1), the driving component (13) is connected to the sealing component (12), and the driving component (13) is used to control the sealing component (12) to enter a sealing state and a sealing release 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).

2. A carbon dioxide injection packer according to claim 1, characterized in that: The external unsealing component (8) comprises 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 by reverse threading, an inverted shear pin (82) is screwed into the upper side of the external unsealing sleeve (81), the inverted shear pin (82) is screwed into the wall of the upper joint (2), an external unsealing shear pin (83) is screwed into the lower side of the external unsealing sleeve (81), 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).

3. A carbon dioxide injection packer as claimed in claim 2, characterized in that: The inner unsealing component (9) comprises an inner unsealing sleeve (91), which is slidably mounted on the upper side of the inner layer of the central tube (1), and an inner unsealing shearing pin (92) is screwed into the lower side of the inner unsealing sleeve (91), and the inner unsealing shearing pin (92) is screwed into the wall of the central tube (1).

4. A carbon dioxide injection packer as claimed in claim 3, characterized in that: The movable component (10) comprises a slip sleeve (101), the slip sleeve (101) being located at an upper outer layer position of the central tube (1), the slip sleeve (101) being a structure with holes on the surface, a slip sleeve end cap (102) being fixedly connected to the upper side of the slip sleeve (101), an upper cone (103) being slidably mounted between the outer layer of the central tube (1) and the slip sleeve end cap (102), the upper outer layer of the upper cone (103) being connected to the external decapping sleeve ( The outer layer of the central tube (1) is fixedly connected to the lower inner layer of the upper cone (103), 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).

5. A carbon dioxide injection packer as claimed in claim 4, characterized in that: 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).

6. A carbon dioxide injection packer as claimed in claim 5, characterized in that: The sealing assembly (12) comprises 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), 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).

7. A carbon dioxide injection packer as claimed in claim 6, characterized in that: The driving assembly (13) comprises an end cylinder (131), 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), the inner layer of the upper side of the end cylinder (131) is fixedly connected with a main driving piston (132), 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) near the lower pressure ring (124) is fixedly connected to a seating spring (136).

8. A carbon dioxide injection packer as claimed in claim 7, characterized in that: The salvaging tool (14) comprises a connecting tube (141), the connecting tube (141) being used to extend into the upper joint (2), the lower end of the connecting tube (141) being fixedly connected to a petal opening claw spring (142), and the petal opening claw spring (142) being provided with a raised layer (143).

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