Hydraulic self-locking oil drainage anchoring device

Abstract

A hydraulic self-locking oil drainage anchoring device comprises a center pipe, an upper connector and a lower connector, the upper connector and the center pipe are fixedly installed up and down, the center pipe is sleeved with an upper outer cylinder, an anchor body and a lower outer cylinder, and the upper outer cylinder, the anchor body, the lower outer cylinder and the lower connector are sequentially and fixedly installed up and down. The front end of the inner round face of the anchor body and the outer round face of the large-diameter section of the center pipe slide up and down and are installed in a sealed mode, an outer flow through hole is formed in the rear side of the wall of the upper outer barrel, guide holes distributed in the circumferential direction are formed in the anchor body, anchor teeth are installed in the guide holes in a sliding and sealed mode, and clamping openings are formed in the outer end faces of the anchor teeth. A pressing plate corresponding to the bayonet is fixedly installed on the outer circle face of the anchor body, a radial spring is installed between the inner end face of the bayonet and the pressing plate, a sealing head is installed between the center pipe and the lower connector in a vertical sliding and sealing mode, and an axial spring is installed between the anchor body and the sealing head. After the water pressure disappears, the anchor teeth are still tightly expanded and hooped on the inner circle face of the sleeve, the anchoring structure is firm, and the problems of oil pipe stretching, wriggling, deformation and the like are thoroughly solved.

Description

Technical Field

[0001] The utility model relates to an oilfield mining tool, in particular to a hydraulic self-locking oil-draining anchoring device. Background Art

[0002] As oilfield production enters the middle and late stages, formation depletion, low interlayer pressure, and low crude oil permeability make crude oil extraction difficult. Water injection into the formations is necessary to control interlayer pressure. During this process, factors such as water pressure and temperature can cause the oil pipes used for oil extraction to expand, contract, creep, and deform relative to the casing. This can lead to leaks in seals on extraction equipment and reduce water injection efficiency.

[0003] The traditional way to fix the oil pipe is to use a supported packer together with a hydraulic seat packer. When the oil well is shallow or the ballast is small, the oil pipe will still expand, contract, creep and deform due to factors such as water pressure and temperature, causing the seal of the supported packer to fail and leakage between layers.

[0004] To solve the leakage problem, hydraulic anchoring is currently used. However, hydraulic anchors are greatly affected by water pressure. When the water pressure disappears, the anchor teeth are retracted and the anchoring effect is lost. The anchoring structure is not firm, and the oil pipe still has problems such as expansion, contraction, creep, and deformation. Summary of the Invention

[0005] The utility model is to solve the above technical problems and provide a hydraulic self-locking oil leakage anchoring device. After the water pressure disappears, the anchor teeth are still tightly expanded on the inner circular surface of the casing, the anchoring structure is firm, and the problems of oil pipe expansion, creeping, deformation, etc. are completely solved.

[0006] The technical solution of this utility model is:

[0007] The cam is secured to the outer wall of the anchor tube and is secured to the cam face with an angular channel formed between the top and bottom of the anchor tube, with the cam being secured to the cam face with an angular channel formed between the top and bottom of the anchor tube.

[0008] Furthermore, an unsealing shear pin is installed between the central tube and the upper outer tube, the central tube is moved upward to cut off the unsealing shear pin, the thin tube section of the central tube enters the upper outer tube, the water in the guide hole is discharged through the thin tube section of the central tube and the anchor body and the external flow hole, the radial spring rebounds, the anchor tooth is separated from the inner circular surface of the casing, and the anchoring state is released.

[0009] Furthermore, a locking cap is installed through a thread on the outer circumferential surface of the thick diameter section of the center tube and located in the upper outer tube, and the unsealing shear pin is installed between the locking cap and the upper outer tube. When the water pressure in the center tube receiving oil pipe is low, the center tube is moved upward and the locking cap pulls the unsealing shear pin upward to break off; or when the water pressure in the center tube receiving oil pipe is high, the center tube is rotated and the locking cap moves upward under the action of the thread to break off the unsealing shear pin.

[0010] Furthermore, an internal flow hole is provided on the wall of the central tube on the inner front side of the upper outer tube. When the central tube drives the locking cap to move upward, the water pressure in the upper outer tube is discharged through the internal flow hole to prevent the locking cap from being unable to move upward under the action of the water pressure in the upper outer tube.

[0011] Furthermore, a floating piston is installed between the center tube and the upper outer tube and in front of the locking cap. The water pressure entering the upper outer tube through the inner flow hole generates a downward thrust on the center tube via the floating piston and the locking cap. This thrust is balanced with the lifting force generated by the water pressure acting on the lower end face of the center tube, preventing the center tube from driving the oil pipe upward during use.

[0012] Furthermore, a starting shear pin is installed between the sealing head and the lower joint, and the injected water pressure pushes the sealing head upward and starts the shear pin, thereby unlocking the starting shear pin.

[0013] Furthermore, the guide holes are provided in multiple groups, and the multiple groups of guide holes are distributed vertically on the anchor body to increase the friction with the inner circular surface of the casing.

[0014] The beneficial effects of the utility model are:

[0015] During the anchoring operation, the water pressure injected through the oil pipe produces an upward thrust on the sealing head. Under the action of the thrust, the sealing head overcomes the spring force and moves upward. The center pipe and the lower joint are in an open state. The water pressure enters the guide hole through the outer circular surface of the thin tube section of the center pipe and the inner circular surface of the anchor body. The water pressure entering the guide hole produces a radial outward thrust on the anchor teeth. The anchor teeth overcome the spring force and move radially outward and are tightly expanded on the inner circular surface of the casing. The water pressure between the outer circular surface of the thin tube section of the center pipe and the inner circular surface of the anchor body is balanced with the water pressure in the center pipe. The sealing head rebounds under the action of the axial spring rebound force, and the center pipe and the lower joint are sealed again. After the water pressure disappears, the anchor teeth are still tightly expanded on the inner circular surface of the casing. The anchoring structure is firm, which completely solves the problems of tubing expansion and contraction, creep, and deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 yes Figure 1 Installation position diagram of the middle anchor tooth;

[0018] Figure 3 yes Figure 2 AA section view of the middle anchor tooth;

[0019] In the figure: 1-center tube, 2-upper joint, 3-upper outer tube, 4-anchor body, 5-lower outer tube, 6-lower joint, 7-external flow hole, 8-locking cap, 9-unsealing shear pin, 10-floating piston, 11-inner flow hole, 12-guide hole, 13-anchor tooth, 14-bayonet, 15-pressure plate, 16-radial spring, 17-sealing head, 18-starting shear pin, 19-axial spring. DETAILED DESCRIPTION

[0020] like Figure 1-Figure 3 As shown, a hydraulic self-locking oil leakage anchor device comprises a central tube 1 and an upper joint 2 fixedly installed up and down, the outer circumference of the central tube 1 is thick at the top and thin at the bottom, and an upper outer tube 3, an anchor body 4, a lower outer tube 5 and a lower joint 6 are fixedly installed in sequence on the outer surface of the central tube 1. The front end of the inner circumference of the anchor body 4 slides up and down and is sealed with the outer circumference of the thick diameter section of the central tube 1. An external flow hole 7 is provided on the rear side of the wall of the upper outer tube 3. A locking cap 8 is installed by threading on the outer circumference of the central tube 1 in the upper outer tube 3. An unsealing shear nail 9 is installed between the locking cap 8 and the upper outer tube 3. A floating piston 10 is installed between the central tube 1 and the upper outer tube 3 and in front of the locking cap 8. An inner flow hole 11 is provided on the inner front side of the upper outer tube, and three groups of guide holes 12 distributed up and down are provided on the anchor body 4. Each group of guide holes 12 is distributed circumferentially, and each guide hole 12 extends in the radial direction. An anchor tooth 13 is slidably and sealedly installed in the guide hole 12, and a bayonet 14 is provided on the outer end surface of the anchor tooth 13. A pressure plate 15 corresponding to the bayonet 14 is fixedly installed on the outer circular surface of the anchor body 4 by screws, and a radial spring 16 is installed between the inner end surface of the bayonet 14 and the pressure plate 15. A sealing head 17 is slidably and sealedly installed between the center tube 1 and the lower joint 6, a starting shear nail 18 is installed between the sealing head 17 and the lower joint 6, and an axial spring 19 is installed between the anchor body 4 and the sealing head 17.

[0021] The working principle of this utility model is:

[0022] The hydraulic self-locking oil drain anchor device is fixedly connected to the oil pipe through the upper joint 2 and the lower joint 6, and is inserted into the casing along with the oil pipe.

[0023] During the anchoring operation, when water is injected through the oil pipe, the injected water pressure produces an upward thrust on the sealing head 17. Under the action of the thrust, the sealing head 17 cuts off the starting shear nail 18 and overcomes the spring force to move upward. The center tube 1 and the lower joint 6 are in an open state, and the water pressure enters the guide hole 12 between the outer circular surface of the thin tube section of the center tube 1 and the inner circular surface of the anchor body 4. The water pressure entering the guide hole 12 produces a radial outward thrust on the anchor teeth 13. The anchor teeth 13 overcome the spring force and move radially outward and are tightly expanded on the inner circular surface of the casing. The water pressure between the outer circular surface of the thin tube section of the center tube 1 and the inner circular surface of the anchor body 4 is balanced with the water pressure in the center tube 1. The sealing head 17 rebounds under the action of the rebound force of the axial spring 19, and the center tube 1 and the lower joint 6 are sealed again, completing the anchoring operation.

[0024] During the disassembly operation, the center tube 1 is moved upward or rotated to generate an upward pulling force on the locking cap 8. The locking cap 8 cuts off the unsealing shear nail 9 under the action of the pulling force, and the center tube 1 is continued to be moved upward. The outer cylindrical surface of the thin tube section of the center tube 1 enters the upper outer cylinder 3, and the water pressure in the guide hole 12 is discharged in turn through the space between the center tube 1 and the anchor body 4 and the outer flow hole 7. The anchor teeth 13 move radially inward under the action of the rebound force of the radial spring 16 and disengage from the inner cylindrical surface of the casing. The oil pipe is moved upward to pull the hydraulic self-locking oil drainage anchor device out of the casing, and the disassembly operation is completed.

[0025] The above are only specific embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A hydraulic self-locking oil drain anchor device, comprising a central tube, an upper joint, and a lower joint, wherein the upper joint and the central tube are fixedly mounted vertically, characterized in that: The outer circular surface of the center tube is thick and the lower part is thin. An outer tube, an anchor body and a lower outer tube are sleeved on the outer side of the center tube. The upper outer tube, the anchor body, the lower outer tube and the lower joint are fixedly installed in sequence up and down. The front end of the inner circular surface of the anchor body slides up and down and is sealed with the outer circular surface of the thick tube section of the center tube. An outflow hole is provided on the rear side of the cylinder wall of the upper outer tube, and a circumferentially distributed guide hole is provided on the anchor body. Each guide hole extends in the radial direction, and an anchor tooth is slid and sealed in the guide hole. A bayonet is provided on the outer end face of the anchor tooth, and a pressure plate corresponding to the bayonet is fixedly installed on the outer circular surface of the anchor body. A radial spring is installed between the inner end face of the bayonet and the pressure plate. A sealing head is slid up and down and sealed between the center tube and the lower joint, and an axial spring is installed between the anchor body and the sealing head.

2. The hydraulic self-locking oil drain anchor device according to claim 1, characterized in that: Install unsealing shear pins between the center tube and the upper outer tube.

3. The hydraulic self-locking oil drain anchor device according to claim 2, characterized in that: A locking cap is installed on the outer circumference of the thick pipe section of the central pipe and is located inside the upper outer tube through threads, and the unsealing shear pin is installed between the locking cap and the upper outer tube.

4. The hydraulic self-locking oil drain anchor device according to claim 1, characterized in that: An inner flow hole is provided on the wall of the central tube at the inner front side of the upper outer tube.

5. The hydraulic self-locking oil drain anchor device according to claim 3, characterized in that: A floating piston is installed between the central tube and the upper outer tube and in front of the locking cap.

6. The hydraulic self-locking oil drain anchor device according to claim 1, characterized in that: Install the starter shear pins between the sealing head and the lower joint.

7. The hydraulic self-locking oil drain anchor device according to claim 1, characterized in that: There are multiple groups of guide holes, which are distributed vertically on the anchor body.

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