A long-life petroleum packer

Abstract

The present invention provides a long-life petroleum packer, which relates to the field of packers and includes: a packer body; the interior of the packer body is sleeved with two additional rubber sleeves arranged opposite to each other, each additional rubber sleeve is fixed with two inner parts made of elastic metal, a ring-shaped and evenly arranged pushing assembly is fixed between the two inner parts, and the pushing assembly made of elastic metal is an arc-shaped plate-shaped structure. When the packer body is being sealed, the original rubber sleeve is used for preliminary sealing to ensure the most basic sealing effect. While the additional rubber sleeve assists in sealing, the moving part is deformed by elasticity, and the additional sleeve is continuously pushed after deformation to ensure that the additional rubber sleeve continues to expand and seal, avoiding aging and affecting the sealing effect and service life. This solves the problem that the common petroleum packer will continue to age with the increase of use time during long-term or permanent sealing, resulting in a decrease in the sealing effect and affecting the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of packers, and particularly to a long-life petroleum packer. Background Art

[0002] A petroleum packer is a downhole tool used to seal the annular space between the tubing and the casing of an oil and gas well or the open-hole wellbore. When it is necessary to seal the annular space between the tubing and the casing of an oil and gas well or the open-hole wellbore, after the operations of well flushing and well washing, the packer is installed on the downhole string and lowered to a sufficient designed depth, and then the sealing element on the packer is expanded by means of hydraulic drive or the like to seal the oil-casing ring component space, isolate the producing formation, and play its role. A petroleum packer is a downhole tool with an elastic sealing element. Currently, there are various packers with different releasing methods, but their functions are the same, which is to separate different layers during actual downhole operations, exert its high-strength bearing capacity for temperature and pressure, make the separated layers independent of each other and not interfere with each other, and complete its operations of fracturing, water injection stratification, liquid production control, water plugging, and casing protection. However, for common petroleum packers on the market, during long-term or permanent sealing, as the service time increases, the rubber cylinder will continuously age, resulting in a decline in the sealing effect, affecting the service life. Moreover, when the packer moves in the well, it will generate relatively large friction and vibration, affecting the stability of the packer during later use. When removing the packer, it is relatively laborious to dock the downhole string with the packer, affecting the removal efficiency. Summary of the Invention

[0003] An embodiment of the present disclosure relates to a long-life petroleum packer. When connecting the downhole string to the packer body and when it is necessary to remove the packer body, the downhole string is controlled to contact the guide head. Since the cross-section of the guide head is a triangular structure and the outer side is an inclined structure, the downhole string can be positioned and sleeved, and the threads can be conveniently docked, improving the docking efficiency and facilitating the removal of the packer body. At the same time, after the downhole string is tightened by the threads, the moving head and the fixed tooth structure are in anti-slip contact and fixed with the downhole string by means of the elasticity of the spring, improving the connection and fixing effect and avoiding loosening.

[0004] In the first aspect of the present disclosure, a long-life oil packer is provided, specifically including: a packer body; two oppositely arranged additional rubber cylinders are sleeved inside the packer body. After the packer body is pulled and drawn, the two additional rubber cylinders come into contact with each other and squeeze each other. Two inner members made of elastic metal are fixed inside each additional rubber cylinder. A pushing assembly arranged in a ring shape and evenly distributed is fixed between the two inner members. The pushing assembly made of elastic metal is in an arc-shaped plate structure, and an arc-shaped rod is arranged on the outer side of the pushing assembly; an installation component; the installation component is sleeved and installed on the outer bottom end of the packer body. A movable component that can move freely is installed on the outside of the installation component through an embedding groove and a spring. The outer sides of the four movable components are in an arc-shaped structure, and a rotatable component that can rotate freely is built inside the outer sides of the movable components; a connector structure; the connector structure is welded above the packer body. A thread is provided at the top of the connector structure and is connected to the downhole pipe string through the thread. A guiding head in a circular ring structure is provided at the top of the connector structure. The cross-section of the guiding head is in a triangular structure. A movable head is fixed to the outside of the connector structure through a movable ring and a support rod. A fixed tooth structure in a pyramid structure is fixed to the top of the movable head.

[0005] In at least some embodiments, two original rubber cylinders that can be deformed under pressure are fixed to the top end of the packer body. The two additional rubber cylinders are located below the two original rubber cylinders. Four annularly arranged movable blocks are sleeved on the outer bottom end of the packer body, and the bottom end of the movable block is in a T-shaped structure; the outsides of the four movable blocks are connected together through an elastic ring. A fixed block assembly with wedge-shaped teeth on the outside is fixed to the top end of the movable block. The inner side of the fixed block assembly is in an inclined structure. After the packer body is pulled and drawn, the movable block and the fixed block assembly can be squeezed to move outward; an H-shaped inner groove is penetrated and opened inside the movable block and the fixed block assembly. A limiting head assembly that can be pulled and drawn freely is installed inside the inner groove. The upper inner side of the limiting head assembly is in an inclined structure. After the packer body is pulled and drawn and the movable block and the fixed block assembly are squeezed to move, the limiting head assembly can be further pushed to move outward. A pyramid-shaped rod arranged in an inclined manner is provided at the bottom of the outer side of the limiting head assembly.

[0006] In at least some embodiments, four annularly arranged movable grooves are provided at the top end of the installation component. The movable block is inserted into the movable groove for guiding movement. A sleeve ring component is sleeved on the outside of the installation component, and the sleeve ring component is sleeved on the outside of the four movable components; four annularly arranged embedding grooves are provided on the outside of the installation component. The movable component is inserted into the embedding groove. A positioning groove is provided inside the movable component, and a spring is inserted into the positioning groove; a guiding groove is opened at each of the upper and lower sides of the movable component. The two ends of the guiding groove are internally communicated with the installation position of the rotating component through a round hole. A flow-through groove is opened at the middle position between the two guiding grooves, and the flow-through groove is opened at the middle position on the outer side of the movable component.

[0007] In at least some embodiments, a spring is sleeved outside the connector structure, a retaining ring is fixed outside the connector structure, the bottom of the spring contacts the top of the retaining ring, and a positioning rod structure is fixed on each side of the connector structure; a through groove is respectively formed on each side of the connector structure, a moving ring in a circular ring structure is sleeved outside the connector structure, and the bottom of the moving ring contacts the top of the spring; the top of the moving ring contacts the bottom of the positioning rod structure, two support rods are respectively fixed on both sides of the moving ring, the top of the support rod is welded to the moving head, and the moving head is inserted into the through groove and can freely move up and down.

[0008] The present invention provides a long-life petroleum packer, which has the following beneficial effects:

[0009] When the packer body seals off, it is initially sealed off by the original rubber cylinder to ensure the most basic sealing effect. At the same time, the packer body controls the additional rubber cylinder to be compressed and used together, so that the additional rubber cylinder squeezes the inner part and the pushing component together. While the additional rubber cylinder assists in sealing off, the moving part deforms elastically, and after deformation, it continuously pushes the additional sleeve to ensure that the additional rubber cylinder continuously expands and seals off, avoiding affecting the sealing effect and service life after aging.

[0010] After the packer body is lowered into the well, the moving metal drives the rotating part to move together, so that the rotating part can be in sliding contact with the well wall, enabling the packer body to slide smoothly and displace, avoiding large friction and affecting the use of the packer body. At the same time, when there is friction or vibration, the moving part is forced to squeeze the spring, and with the elasticity of the spring, the vibration force is eliminated to ensure the stability of the packer body.

[0011] When connecting the downhole string and the packer body and when it is necessary to take out the packer body, control the downhole string to contact the guide head. Since the cross-section of the guide head is a triangular structure and the outer side is an inclined structure, the downhole string can be positioned and sleeved, and the threaded connection can be carried out conveniently, improving the connection efficiency and facilitating the removal of the packer body. At the same time, after the downhole string is tightened by the thread, the moving head and the fixed tooth structure are in anti-slip contact with the downhole string by means of the elasticity of the spring, improving the connection and fixing effect and avoiding loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0013] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0014] In the drawings:

[0015] Figure 1 The three-dimensional structural schematic diagram of the present application is shown;

[0016] Figure 2 Shows the bottom view structural schematic diagram of the present application;

[0017] Figure 3 Shows the exploded three-dimensional structural schematic diagram of the present application;

[0018] Figure 4 Shows the exploded bottom view structural schematic diagram of the present application;

[0019] Figure 5 Shows the partial combined three-dimensional structural schematic diagram of the present application;

[0020] Figure 6 Shows the exploded three-dimensional and partial cross-section enlarged structural schematic diagram of the packer body of the present application;

[0021] Figure 7 Shows the exploded three-dimensional structural schematic diagram of the installation component of the present application;

[0022] Figure 8 Shows the exploded three-dimensional structural schematic diagram of the connector structure of the present application.

[0023] List of reference numerals

[0024] 1. Packer body; 101. Original rubber cylinder; 102. Additional rubber cylinder; 103. Inner part; 104. Pushing assembly; 105. Moving block; 106. Fixed block assembly; 107. Inner groove; 108. Limit head assembly;

[0025] 2. Installation component; 201. Moving groove; 202. Collar component; 203. Embedding groove; 204. Moving component; 205. Positioning groove; 206. Rotating component; 207. Guide groove; 208. Flow-through groove;

[0026] 3. Connector structure; 301. Retaining ring; 302. Positioning rod structure; 303. Through groove; 304. Guide head; 305. Moving ring; 306. Support rod; 307. Moving head; 308. Fixed tooth structure. Detailed implementation manners

[0027] Example 1: Please refer to Figures 1 to 8 :

[0028] The present invention provides a long-life oil packer, comprising: a packer body 1; two oppositely arranged additional rubber cylinders 102 are sleeved inside the packer body 1. After the packer body 1 is pulled and drawn, the two additional rubber cylinders 102 come into contact with each other and extrude each other, so that the additional rubber cylinders 102 can assist in sealing. Two inner members 103 made of elastic metal are fixed inside each additional rubber cylinder 102. A pushing assembly 104 arranged in a ring shape and evenly arranged is fixed between the two inner members 103. The pushing assembly 104 made of elastic metal is in an arc-shaped plate structure. An arc-shaped rod is arranged on the outer side of the pushing assembly 104. When the inside of the additional rubber cylinder 102 deforms, it continuously supports the additional rubber cylinder 102, improves the plugging effect, and avoids affecting the service life after aging; an installation component 2; the installation component 2 is sleeved and installed on the outer bottom end of the packer body 1. A movable component 204 that can move freely is installed on the outside of the installation component 2 through an embedding groove 203 and a spring, so that the movable component 204 can eliminate the vibration force by means of the elasticity of the spring. The outer sides of the four movable components 204 are in an arc-shaped structure. A rotatable component 206 that can rotate freely is built in the outer side of the movable component 204, so that the movable component 204 can contact the well wall, enabling the packer body 1 to displace smoothly without causing large wear; a connector structure 3; the connector structure 3 is welded above the packer body 1. A thread is provided at the top of the connector structure 3 and is connected to the downhole pipe string through the thread. A guide head 304 in a circular ring structure is provided at the top of the connector structure 3. The cross-section of the guide head 304 is in a triangular structure, which controls the precise docking of the downhole pipe string and the packer body 1, improves the docking efficiency and the connection effect. A movable head 307 is fixed to the outside of the connector structure 3 through a movable ring 305 and a support rod 306. A fixed tooth structure 308 in a pyramid structure is fixed to the top of the movable head 307. It makes anti-slip contact with the downhole pipe string by means of the spring elasticity, improves the connection and fixing effect, and avoids the downhole pipe string from loosening.

[0029] In the embodiments of the present disclosure, as Figure 6As shown, two original rubber cylinders 101 that can be deformed under pressure are fixed at the top of the packer body 1. They can expand and contact the wellbore to improve the sealing effect. Two additional rubber cylinders 102 are located below the two original rubber cylinders 101. Four annularly arranged moving blocks 105 are sleeved outside the bottom end of the packer body 1. The bottom end of the moving block 105 is of a T-shaped structure, which drives the fixed block assembly 106 to move together. The four moving blocks 105 are connected together by an elastic ring. The top end of the moving block 105 is fixed with a fixed block assembly 106 with wedge-shaped teeth on the outside, which is used to contact and fix with the wellbore. The inner side of the fixed block assembly 106 is of an inclined structure. After the packer body 1 is pulled, the moving block 105 and the fixed block assembly 106 can be extruded to move outward. An H-shaped inner groove 107 is penetrated through the inside of the moving block 105 and the fixed block assembly 106. A freely pullable limit head assembly 108 is installed inside the inner groove 107. The upper inner side of the limit head assembly 108 is of an inclined structure. After the packer body 1 is pulled and the moving block 105 and the fixed block assembly 106 are extruded to move, the limit head assembly 108 can be further pushed to move outward. The outer bottom of the limit head assembly 108 is provided with a pyramid-shaped rod arranged in an inclined manner. After the fixed block assembly 106 moves, the limit head assembly 108 can also move under force, driving the pyramid-shaped rod to contact the wellbore to improve the fixed connection effect.

[0030] In the embodiment of the present disclosure, as Figure 7 shown, four annularly arranged moving grooves 201 are provided at the top of the installation part 2. The moving block 105 is inserted into the inside of the moving groove 201 for guiding movement, so that the moving block 105 is guided to displace. A collar part 202 is sleeved outside the installation part 2. The collar part 202 is sleeved outside the four moving parts 204 to prevent the moving parts 204 from moving outward and detaching. Four annularly arranged embedding grooves 203 are provided outside the installation part 2. A moving part 204 is inserted into the inside of the embedding groove 203. A positioning groove 205 is provided inside the moving part 204, and a spring is inserted into the positioning groove 205. A guide groove 207 is respectively opened on the upper and lower sides of the moving part 204. The two ends of the guide groove 207 are internally communicated with the installation position of the rotating part 206 through round holes, so that liquid or air can pass through the rotating part 206 to assist in heat dissipation. A circulation groove 208 is opened at the middle position outside the two guide grooves 207. The circulation groove 208 is opened at the middle position outside the moving part 204 to facilitate the passage of liquid or air and reduce the downward resistance of the packer body 1.

[0031] In the embodiment of the present disclosure, as Figure 8As shown, a spring is sleeved outside the connector structure 3, continuously pushing the moving ring 305 upward. A retaining ring 301 is fixed outside the connector structure 3, and the bottom of the spring contacts the top of the retaining ring 301. A positioning rod structure 302 is fixed on each side of the connector structure 3 to support the moving ring 305 and prevent the moving ring 305 from rising excessively. A through groove 303 is provided on each side of the connector structure 3. A moving ring 305 with a circular ring structure is sleeved outside the connector structure 3. The bottom of the moving ring 305 contacts the top of the spring. The top of the moving ring 305 contacts the bottom of the positioning rod structure 302. Two support rods 306 are fixed on each side of the moving ring 305. The top of the support rod 306 is welded to the moving head 307. The moving head 307 is inserted into the through groove 303 and can move freely up and down, driving the fixed tooth structure 308 to move together for use.

[0032] The working principle of this embodiment: First, control the packer body 1 to be connected to the downhole string through the connector structure 3 and threads, and control the packer body 1 to penetrate into the well through the downhole string. While the packer body 1 is moving, the spring continuously pushes the moving part 204 to move outward, contacts the well wall through the rotating part 206, so that the packer body 1 can move smoothly, and reduce friction and wear. During the movement, if vibration occurs, the moving part 204 can compress the spring and eliminate the vibration force by means of elasticity, improving the stability of the packer body 1 and avoiding affecting the plugging effect. When the packer body 1 moves to the plugging position, control the operation of the packer body 1 assembly to pull and draw, so that the original rubber cylinder 101 is squeezed and sealed, and at the same time, the additional rubber cylinder 102 is squeezed. The additional rubber cylinder 102 will push the pushing assembly 104 and the inner part 103 together, so that the pushing assembly 104 continuously supports the expansion of the additional rubber cylinder 102. The pushing assembly 104 is supported inside the additional rubber cylinder 102, improving the plugging effect and service life, and avoiding affecting the plugging effect after aging. When plugging is not required, control the downhole string to contact the guide head 304. The guide head 304 controls the guiding displacement of the downhole string, accurately docks with the connector structure 3, improving the docking effect. After tightening with threads, it anti-slip contacts with the fixed tooth structure 308, improving the connection effect, so that the packer body 1 can be quickly lifted out.

Claims

1. A long-life oil packer, characterized in that: include: A packer body (1); the packer body (1) is internally sleeved with two additional rubber cylinders (102) arranged opposite to each other. After the packer body (1) is pulled, the two additional rubber cylinders (102) are in contact with each other and squeezed against each other. Two inner parts (103) made of elastic metal are fixed inside each additional rubber cylinder (102). A ring-shaped and evenly arranged pushing component (104) is fixed between the two inner parts (103). The pushing component (104) made of elastic metal is an arc-shaped plate-shaped structure. An arc-shaped rod is arranged on the outside of the pushing component (104); a mounting component (2); the mounting component (2) is sleeved and installed on the outside of the bottom end of the packer body (1). The outside of the mounting component (2) is provided with a movable A freely displaceable moving part (204), wherein the outer sides of the four moving parts (204) are arc-shaped structures, and a freely rotatable rotating part (206) is built into the outer sides of the moving parts (204); a connector structure (3); the connector structure (3) is welded on the top of the packer body (1), and the top of the connector structure (3) is provided with a thread, and is connected to the downhole pipe string through the thread, and the top of the connector structure (3) is provided with a guide head (304) with a circular ring structure, and the cross section of the guide head (304) is a triangular structure, and a moving head (307) is fixed to the outside of the connecting head structure (3) through a moving ring (305) and a support rod (306), and a fixed tooth structure (308) with a pyramidal structure is fixed to the top of the moving head (307).

2. A long-life oil packer according to claim 1, characterized in that: Two original rubber cylinders (101) that can be deformed under pressure are fixed on the top of the packer body (1), and two additional rubber cylinders (102) are located below the two original rubber cylinders (101). Four ring-shaped movable blocks (105) are mounted on the outside of the bottom end of the packer body (1), and the bottom end of the movable block (105) is a T-shaped structure.

3. A long-life oil packer according to claim 2, characterized in that: The outsides of the four moving blocks (105) are connected together by an elastic ring, and a fixed block assembly (106) with wedge-shaped teeth on the outside is fixed to the top of the moving block (105). The inside of the fixed block assembly (106) is an inclined structure. After the packer body (1) is pulled out, the moving block (105) and the fixed block assembly (106) can be squeezed to move outward.

4. A long-life oil packer according to claim 3, characterized in that: The movable block (105) and the fixed block assembly (106) are provided with an inner groove (107) of an H-shaped structure, and a freely withdrawable limit head assembly (108) is installed inside the inner groove (107). The upper inner side of the limit head assembly (108) is an inclined structure. After the packer body (1) is withdrawn, the movable block (105) and the fixed block assembly (106) are squeezed to move, and the limit head assembly (108) can continue to be pushed outward. The outer bottom of the limit head assembly (108) is provided with an inclined pyramidal rod.

5. A long-life oil packer according to claim 4, characterized in that: The top of the installation component (2) is provided with four annularly arranged moving grooves (201), the moving block (105) is inserted into the inside of the moving groove (201) to guide the movement, and the outside of the installation component (2) is sleeved with a collar component (202), and the collar component (202) is sleeved on the outside of the four moving components (204).

6. A long-life oil packer according to claim 5, characterized in that: The outside of the installation component (2) is provided with four annularly arranged embedding grooves (203), a moving component (204) is inserted into the embedding grooves (203), a positioning groove (205) is provided on the inner side of the moving component (204), and a spring is inserted into the positioning groove (205).

7. A long-life oil packer according to claim 6, characterized in that: A guide groove (207) is respectively provided on the upper and lower sides of the movable component (204); both ends of the guide groove (207) are connected to the inside of the installation position of the rotating component (206) through a circular hole; a flow groove (208) is provided at the middle position outside the two guide grooves (207); and the flow groove (208) is provided at the middle position outside the movable component (204).

8. A long-life oil packer according to claim 7, characterized in that: The connector structure (3) is sleeved with a spring on its exterior, a retaining ring (301) is fixed on its exterior, the bottom of the spring contacts the top of the retaining ring (301), and a positioning rod structure (302) is fixed on each side of the connector structure (3).

9. A long-life petroleum packer according to claim 8, characterized in that: A through slot (303) is respectively provided on both sides of the connector structure (3), and a movable ring (305) of an annular structure is sleeved on the outside of the connector structure (3), and the bottom of the movable ring (305) contacts the top of the spring.

10. A long-life petroleum packer according to claim 9, characterized in that: The top of the moving ring (305) contacts the bottom of the positioning rod structure (302), two support rods (306) are fixed on both sides of the moving ring (305), the top of the support rod (306) is welded to the moving head (307), and the moving head (307) is inserted into the through groove (303) and can move freely up and down.

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