CN223374370U - Hydraulic self-locking oil drainage anchoring device - Google Patents

Abstract

A hydraulic self-locking oil drain anchor device comprises a center tube, an upper joint, and a lower joint. The upper joint and center tube are fixedly mounted vertically. An outer tube, an anchor body, and a lower outer tube are sleeved onto the center tube. The upper outer tube, anchor body, lower outer tube, and lower joint are fixedly mounted vertically in sequence. The inner front end of the anchor body slides up and down and is sealed against the outer surface of the thick-diameter section of the center tube. Outflow holes are provided on the rear side of the upper outer tube wall. The anchor body is provided with circumferentially distributed guide holes. Anchor teeth slide and seal within the guide holes. A bayonet is provided on the outer end surface of the anchor teeth. A pressure plate corresponding to the bayonet is fixedly mounted on the outer outer surface of the anchor teeth. A radial spring is installed between the inner end surface of the bayonet and the pressure plate. A sealing head slides up and down and seals between the center tube and the lower joint. An axial spring is installed between the anchor body and the sealing head. Even after the water pressure disappears, the anchor teeth remain tightly clamped against the inner surface of the casing, providing a secure anchor structure and completely resolving problems such as expansion, contraction, creep, and deformation of the oil pipe.

Description

Hydraulic self-locking oil drainage anchoring device

Technical Field

The utility model relates to an oilfield exploitation tool, in particular to a hydraulic self-locking oil drainage anchoring device.

Background

The oil field is mined and enters the middle and later stages, the stratum is deficient, the interlaminar pressure is low, the crude oil permeability is low, the crude oil is difficult to mine, and the interlaminar pressure needs to be controlled by water injection into the stratum in a layering way. In the process of separate water injection to stratum, the oil pipe for exploiting oil is affected by water pressure, temperature and other factors, and has the problems of expansion, creeping, deformation and the like relative to the casing pipe outside the oil pipe, so that sealing elements on exploitation equipment are leaked, and the water injection efficiency is reduced.

The traditional oil pipe fixing mode adopts a supporting type packer to be used together with a hydraulic setting type packer setting, when an oil well is shallower or ballasted less, the oil pipe still can generate expansion, peristaltic movement and deformation under the influence of factors such as water pressure, temperature and the like, so that the sealing of the supporting type packer is invalid, and leakage occurs between layers.

In order to solve the leakage problem, a hydraulic anchor anchoring mode is used at present, but the hydraulic anchor is greatly influenced by water pressure, after the water pressure disappears, anchor teeth are retracted, the anchoring effect is lost, an anchoring structure is not firm, and the problems of expansion, creeping, deformation and the like of an oil pipe still exist.

Disclosure of Invention

The utility model aims to solve the technical problems, and provides a hydraulic self-locking oil drainage anchoring device, which has the advantages that after the water pressure disappears, anchor teeth are still tightly expanded and hooped on the inner circular surface of a sleeve, the anchoring structure is firm, and the problems of oil pipe expansion, creeping, deformation and the like are thoroughly solved.

The technical scheme of the utility model is as follows:

The hydraulic self-locking oil drainage anchoring device comprises a central tube, an upper joint and a lower joint, wherein the upper joint and the central tube are fixedly installed up and down, and is characterized in that an outer cylindrical shell, an anchor body and a lower outer cylindrical shell are sleeved outside the central tube, the upper outer cylindrical shell, the anchor body, the lower outer cylindrical shell and the lower joint are fixedly installed up and down in sequence, the front end of the inner cylindrical surface of the anchor body and the outer cylindrical surface of a thick pipe section of the central tube are vertically and hermetically installed, an outflow through hole is formed in the rear side of the wall of the upper outer cylindrical shell, guide holes distributed in the circumferential direction are formed in the anchor body, each guide hole extends in the radial direction, anchor teeth are slidingly and hermetically installed in the guide holes, a bayonet is formed in the outer end face of each anchor tooth, a pressing plate corresponding to the bayonet is fixedly installed on the outer cylindrical surface of the anchor body, a radial spring is installed between the inner end face of each bayonet and the pressing plate, a sealing head is vertically and hermetically installed between the central tube and the lower joint, and an axial spring is installed between each anchor body and the sealing head.

Further, an unsealing shear pin is arranged between the central tube and the upper outer cylinder, the central tube is moved upwards to cut off the unsealing shear pin, the thin-diameter section of the central tube enters the upper outer cylinder, water in the guide hole is discharged through the outer flow through holes between the thin-diameter section of the central tube and the anchor body, the radial spring rebounds, the anchor teeth are separated from the inner circular surface of the sleeve, and the anchoring state is relieved.

Further, a locking cap is arranged on the outer circular surface of the thick pipe diameter section of the central pipe and positioned in the upper outer cylinder through threads, the deblocking shear pin is arranged between the locking cap and the upper outer cylinder, when the water pressure in the central pipe is low in an oil pipe, the central pipe is moved upwards, the locking cap breaks the deblocking shear pin upwards, or when the water pressure in the central pipe is high in the oil pipe, the central pipe is rotated, and the locking cap moves upwards under the action of threads to break the deblocking shear pin.

Further, the inner front side of the central tube wall positioned in the upper outer tube is provided with the inner flow hole, when the central tube drives the locking cap to move upwards, the inner water pressure of the upper outer tube is discharged through the inner flow hole, and the locking cap is prevented from moving upwards under the action of the inner water pressure of the upper outer tube.

Further, a floating piston is arranged between the central tube and the upper outer tube and positioned in front of the locking cap, water pressure entering the upper outer tube through the inner flow hole generates downward thrust force through the floating piston and the locking cap on the central tube, the thrust force is balanced with lifting force generated by water pressure acting on the lower end face of the central tube, and the central tube is prevented from driving the oil tube to move upwards when the locking cap is used.

Furthermore, a starting shear pin is arranged between the sealing head and the lower joint, and the injected water pressure pushes the sealing head to move upwards and start the shear pin, so that the starting shear pin is unlocked.

Furthermore, the guide holes are multiple groups, and the multiple groups of guide holes are distributed on the anchor body up and down, so that the friction force between the anchor body and the inner circular surface of the sleeve is improved.

The beneficial effects of the utility model are as follows:

During anchoring operation, water pressure injected through the oil pipe generates upward thrust to the sealing head, the sealing head moves upwards against the elastic force of the spring under the action of the thrust, the central pipe and the lower joint are in an open state, the water pressure enters the guide hole through the gap between the outer circular surface of the thin pipe diameter section of the central pipe and the inner circular surface of the anchor body, the water pressure entering the guide hole generates radial outward thrust to the anchor teeth, the anchor teeth move radially outwards against the elastic force of the spring and tightly expand and hoop on the inner circular surface of the sleeve, the water pressure between the outer circular surface of the thin pipe diameter section of the central pipe and the inner circular surface of the anchor body and the water pressure in the central pipe reach balance, the sealing head rebounds under the action of the rebound force of the axial spring, the central pipe and the lower joint are plugged again, after the water pressure disappears, the anchor teeth still tightly expand and hoop on the inner circular surface of the sleeve, the anchoring structure is firm, and the problems of oil pipe expansion, creeping, deformation and the like are thoroughly solved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a view of the installation location of the anchor of FIG. 1;

FIG. 3 is a cross-sectional view A-A of the anchor of FIG. 2;

In the figure, the device comprises a 1-central tube, a 2-upper connector, a 3-upper outer cylinder, a 4-anchor body, a 5-lower outer cylinder, a 6-lower connector, a 7-outflow through hole, an 8-locking cap, a 9-deblocking shear pin, a 10-floating piston, an 11-inflow through hole, a 12-guiding hole, a 13-anchor tooth, a 14-bayonet, a 15-pressing plate, a 16-radial spring, a 17-sealing head, a 18-starting shear pin and a 19-axial spring.

Detailed Description

As shown in figures 1-3, the hydraulic self-locking oil drainage anchoring device comprises a central tube 1 and an upper joint 2 which are fixedly arranged up and down, wherein the outer circular surface of the central tube 1 is thick up and thin down, an upper outer tube 3, an anchor body 4, a lower outer tube 5 and a lower joint 6 which are fixedly arranged up and down are sleeved outside the central tube 1 in sequence, the front end of the inner circular surface of the anchor body 4 and the outer circular surface of the thick pipe diameter section of the central tube 1 slide up and down and are hermetically arranged, an outflow through hole 7 is arranged at the rear side of the cylinder wall of the upper outer tube 3, a locking cap 8 is arranged in the upper outer tube 3 through threads on the outer circular surface of the central tube 1, a deblocking shear pin 9 is arranged between the locking cap 8 and the upper outer tube 3, a floating piston 10 is arranged between the central tube 1 and the upper outer tube 3 and in front of the locking cap 8, the inner tube wall of the central tube 1 is provided with inner flow holes 11 at the inner front side of the upper outer tube, three groups of guide holes 12 distributed up and down are arranged on the anchor body 4, each group of guide holes 12 is distributed in the circumferential direction, each guide hole 12 extends along the radial direction, an anchor tooth 13 is slidably and hermetically installed in each guide hole 12, a bayonet 14 is arranged on the outer end face of each anchor tooth 13, a pressing plate 15 corresponding to the bayonet 14 is fixedly installed on the outer circumferential face of the anchor body 4 through screws, a radial spring 16 is installed between the inner end face of the bayonet 14 and the pressing plate 15, a sealing head 17 is slidably and hermetically installed up and down between the central tube 1 and the lower joint 6, a starting shear pin 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.

The working principle of the utility model is as follows:

The hydraulic self-locking oil drainage anchoring device is fixedly connected to the oil pipe through the upper joint 2 and the lower joint 6 and inserted into the sleeve along with the oil pipe.

During anchoring operation, when water is injected through the oil pipe, the injected water pressure generates upward thrust to the sealing head 17, the sealing head 17 cuts off the starting shear pin 18 under the action of the thrust and moves upwards against the spring force, the central pipe 1 and the lower joint 6 are in an open state, the water pressure enters the guide hole 12 through the space between the outer circular surface of the thin pipe diameter section of the central pipe 1 and the inner circular surface of the anchor body 4, the water pressure entering the guide hole 12 generates radial outward thrust to the anchor teeth 13, the anchor teeth 13 move outwards against the spring force radially and tightly expand and hoop on the inner circular surface of the sleeve, the water pressure between the outer circular surface of the thin pipe diameter section of the central pipe 1 and the inner circular surface of the anchor body 4 is balanced with the water pressure in the central pipe 1, the sealing head 17 rebounds under the action of the rebound force of the axial spring 19, the central pipe 1 and the lower joint 6 are plugged again, and the anchoring operation is completed.

During disassembly operation, the central tube 1 is moved upwards or the central tube 1 is rotated to generate upward tension on the locking cap 8, the locking cap 8 cuts off the deblocking shear pin 9 under the action of the tension, the central tube 1 is continuously moved upwards, the outer circular surface of the thin pipe diameter section of the central tube 1 enters the upper outer cylinder 3, the water pressure in the guide hole 12 is sequentially discharged through the outflow through hole 7 between the central tube 1 and the anchor body 4, the anchor teeth 13 radially move inwards under the action of the resilience force of the radial spring 16 and are separated from the inner circular surface of the sleeve, and the hydraulic self-locking oil drainage anchoring device is pulled out from the sleeve by the upward oil moving pipe to finish the disassembly operation.

The above is only a specific embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. The hydraulic self-locking oil drainage anchoring device comprises a central tube, an upper joint and a lower joint, wherein the upper joint and the central tube are fixedly installed up and down, and is characterized in that an upper outer cylinder, an anchor body and a lower outer cylinder are sleeved outside the central tube, the upper outer cylinder, the anchor body, the lower outer cylinder and the lower joint are fixedly installed up and down in sequence, the front end of the inner circular surface of the anchor body and the outer circular surface of a thick pipe section of the central tube are slidably installed up and down and are hermetically installed, an outflow through hole is formed in the rear side of the wall of the upper outer cylinder, guide holes distributed in the circumferential direction are formed in the anchor body, each guide hole extends in the radial direction, anchor teeth are slidably and hermetically installed in the guide holes, bayonets are formed in the outer end faces of the anchor teeth, pressing plates corresponding to the bayonets are fixedly installed on the outer circular surface of the anchor body, radial springs are installed between the inner end faces of the bayonets and the pressing plates, sealing heads are slidably installed up and down and are hermetically installed between the central tube and the lower joint, and axial springs are installed between the anchor body and the sealing heads.

2. The hydraulic self-locking drain anchor device according to claim 1, wherein a deblocking shear pin is installed between the center tube and the upper outer tube.

3. The hydraulic self-locking drainage anchor of claim 2 wherein the locking cap is mounted by threads on the outer circumferential surface of the large diameter section of the center tube and within the upper outer barrel, and the deblocking shear pin is mounted between the locking cap and the upper outer barrel.

4. The hydraulic self-locking drainage anchor of claim 1 wherein the inner front side of the central tube wall positioned in the upper outer tube is provided with an inner flow hole.

5. The hydraulic self-locking drain anchor according to claim 3, wherein a floating piston is installed between the center tube and the upper outer tube and in front of the locking cap.

6. The hydraulic self-locking drain anchor of claim 1, wherein a start shear pin is mounted between the sealing head and the lower head.

7. The hydraulic self-locking drainage anchor device of claim 1 wherein the plurality of groups of guide holes are vertically distributed on the anchor body.