CN107542418A - High-pressure oil-gas well hydraulic oil pipe anchoring device and its method of work - Google Patents

Abstract

The invention relates to a high-pressure oil and gas well hydraulic oil pipe anchoring device and its working method. The cone and the lower joint, a piston is provided between the central tube and the cylinder, a compression spring is provided between the piston and the spring seat, the slips are connected to the return spring, and a slip sleeve is provided on the outside of the slips , the piston is connected to the central pipe through a first shear pin, and the slip sleeve is connected to the upper cone through a second shear pin. Compared with the existing anchoring tool, the present invention has the characteristics of simple structure, less sealing parts, strong anchoring force, low cost, reliable anchoring and easy release of anchoring.

Description

High pressure oil and gas well hydraulic tubing anchoring device and its working method

technical field

The invention relates to the field of oil testing and well completion engineering, and more specifically relates to a hydraulic tubing anchoring device for a high-pressure oil and gas well and a working method thereof.

Background technique

Reservoir stimulation is one of the most effective steps to improve the development of oil and gas fields. During the process of reservoir stimulation, due to the increase of wellhead pressure and the pumping of low-temperature fluid into the wellbore, the deformation of the production test string will affect the stable sealing of the packer. , leading to construction failure. At present, the anchoring device is mainly used to suppress the pressure inside the oil pipe. The slips of the anchoring device protrude outward under the action of the liquid pressure, and clamp the inner wall of the casing to realize the anchoring action, which plays the role of anchoring the pipe string and reduces the sealing capacity. The spacer is stressed. When the pressure of the oil sleeve is balanced, the slips are retracted under the elastic force of the inner spring of the baffle to release the anchoring effect. The development of a hydraulic tubing anchoring device for high-pressure oil and gas wells can effectively reduce the probability of packer failure and ensure the smooth implementation of reservoir stimulation.

Contents of the invention

The technical problem to be solved by the present invention is to provide a hydraulic tubing anchoring device for high-pressure oil and gas wells. By anchoring the slips of the anchoring device on the inner wall of the casing, it plays the role of anchoring the string and reduces the stress on the packer. To prepare for the smooth implementation of reservoir stimulation, it can reduce the possibility of packer failure during fracturing.

The technical scheme adopted by the present invention to solve the technical problem is: to construct a hydraulic oil pipe anchoring device for high-pressure oil and gas wells, including a central pipe, and the outer side of the central pipe is provided with an upper joint, a cylinder barrel, a spring seat, an upper Cone, slips, lower cone and lower joint, a piston is arranged between the central tube and the cylinder, a compression spring is arranged between the piston and the spring seat, the slips are connected to the return spring, and the snap A slip sleeve is provided on the outer side of the shoe, the piston is connected to the center pipe through a first shear pin, and the slip sleeve is connected to the upper cone through a second shear pin.

In the above solution, a first O-ring is provided between the central pipe and the upper joint.

In the above solution, the central pipe and the upper joint are also connected by first hexagon socket head cap screws.

In the above solution, a second O-ring is provided between the central tube and the cylinder.

In the above solution, a third O-ring is provided between the piston and the cylinder.

In the above solution, a fourth O-ring is provided between the piston and the central tube.

In the above solution, the central pipe and the lower joint are also connected by a second hexagon socket head cap screw.

In the above solution, a fifth O-ring is provided between the central pipe and the lower joint.

The working method of the high-pressure oil and gas well hydraulic tubing anchoring device of the present invention is as follows:

When anchoring, the high-pressure liquid pressure acts on the upper end surface of the piston through the hole of the central tube, presses and cuts the first shear pin, the piston overcomes the elastic force of the compression spring and continues to move downward, pushes the upper cone, cuts the second shear pin, and the upper cone The body continues to descend, pushing the slips out and anchoring them in the casing;

When the anchor is released, the pressure of the tubing is released, and under the action of the pressure difference between the compression spring and the casing oil ring, the piston moves upward and drives the upper cone upward, and the return spring shrinks the slips to release the anchor.

Implementing the high-pressure oil and gas well hydraulic tubing anchoring device of the present invention has the following beneficial effects:

1. The present invention acts on the piston by utilizing the pressure of the pressing liquid, and the piston goes down to cut off the slip sleeve and the shear pins on the piston, driving the upper cone to go down. At this time, the lower cone remains supported, so that the slips are opened and occluded on the inner wall of the casing. , to complete the anchoring; the higher the liquid pressure, the greater the thrust of the piston, the more slips the cone squeezes into, the tighter the two-way slips bite the casing, and the more effective the two-way anchoring is. When the anchor is released, the pressure release can make the piston go up and drive the upper cone, and the return spring makes the upper cone retreat and the slips shrink.

2. Compared with the existing anchoring tools, the present invention has the characteristics of simple structure, less sealing parts, strong anchoring force, low cost, reliable anchoring and easy release of anchoring.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a structural schematic diagram of the hydraulic tubing anchoring device for high-pressure oil and gas wells of the present invention.

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in Figure 1, the hydraulic oil pipe anchoring device for high-pressure oil and gas wells of the present invention includes a central pipe 11, and the outer side of the central pipe 11 is provided with an upper joint 1, a cylinder barrel 5, a spring seat 12, an upper cone 13, and slips connected in sequence. 15. The lower cone 18 and the lower joint 21, the piston 10 is set between the central tube 11 and the cylinder 5, the compression spring 9 is set between the piston 10 and the spring seat 12, the slip 15 is connected to the return spring 16, and the slip 15 A slip sleeve 17 is provided on the outside, the piston 10 is connected with the central pipe 11 through the first shear pin 6 , and the slip sleeve 17 is connected with the upper cone 13 through the second shear pin 14 .

A first O-ring 2 is provided between the central pipe 11 and the upper joint 1 , and the central pipe 11 and the upper joint 1 are also connected by first hexagon socket head cap screws 3 . A second O-ring 4 is disposed between the central tube 11 and the cylinder 5 . A third O-ring 7 is provided between the piston 10 and the cylinder 5 . A fourth O-ring 8 is disposed between the piston 10 and the central tube 11 . The central pipe 11 and the lower joint 21 are also connected by a second hexagon socket head cap screw 19 . A fifth O-ring 20 is disposed between the central tube 11 and the lower joint 21 .

The specific working method of the hydraulic tubing anchoring device for high-pressure oil and gas wells is as follows:

When anchoring is required, the high-pressure liquid pressure acts on the upper end surface of the piston 10 through the hole of the central tube 11, and the upper end surface is sealed by the third O-ring 7 and the fourth O-ring 8, and the first shear pin is continuously pressed and cut 6. The piston 10 overcomes the compression spring 9 and continues to descend, pushes the upper cone 13 to cut off the second shear pin 14, the upper cone 13 continues to descend, and pushes the slip 15 to be anchored in the casing. The higher the liquid pressure, the greater the thrust of the piston 10, the more slips the cone squeezes into, the tighter the two-way slips bite the casing, and the more effective the two-way anchoring is.

When the anchor is released, the pressure of the oil pipe is released. Under the action of the pressure difference between the spring 9 and the casing oil ring, the piston 10 moves upwards and drives the upper cone 13. The return spring 16 makes the slips 15 contract and the anchor is released.

Embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementations, and the above-mentioned specific implementations are only illustrative, rather than restrictive, and those of ordinary skill in the art will Under the enlightenment of the present invention, many forms can also be made without departing from the gist of the present invention and the protection scope of the claims, and these all belong to the protection of the present invention.

Claims (9)

1. a kind of high-pressure oil-gas well hydraulic oil pipe anchoring device, it is characterised in that including central tube, set on the outside of the central tube Have the top connection being sequentially connected, cylinder barrel, spring base, upper cone, slips, lower cone and a lower contact, the central tube and cylinder barrel it Between be provided with piston, be provided with compression spring between the piston and spring base, the slips connects back-moving spring, on the outside of the slips Provided with slip sleeve, the piston passes through the second shearing by the first shearing pin connection, the slip sleeve with central tube with upper cone Pin connection.

2. high-pressure oil-gas well hydraulic oil pipe anchoring device according to claim 1, it is characterised in that the central tube with it is upper The first O-ring seal is provided between joint.

3. high-pressure oil-gas well hydraulic oil pipe anchoring device according to claim 1, it is characterised in that the central tube with it is upper Also connected between joint by the first soket head cap screw.

4. high-pressure oil-gas well hydraulic oil pipe anchoring device according to claim 1, it is characterised in that the central tube and cylinder The second O-ring seal is provided between cylinder.

5. high-pressure oil-gas well hydraulic oil pipe anchoring device according to claim 1, it is characterised in that the piston and cylinder barrel Between be provided with the 3rd O-ring seal.

6. high-pressure oil-gas well hydraulic oil pipe anchoring device according to claim 1, it is characterised in that the piston and center The 4th O-ring seal is provided between pipe.

7. high-pressure oil-gas well hydraulic oil pipe anchoring device according to claim 1, it is characterised in that the central tube is with Also connected between joint by the second soket head cap screw.

8. high-pressure oil-gas well hydraulic oil pipe anchoring device according to claim 1, it is characterised in that the central tube is with The 5th O-ring seal is provided between joint.

A kind of 9. method of work of the high-pressure oil-gas well hydraulic oil pipe anchoring device described in claim 1, it is characterised in that

When carrying out grappling, s act on the upper surface of piston by the hole of central tube, suppress the shearing of cutting first Pin, the elastic force of piston overpowers compression spring are continued traveling downwardly, and promote upper cone, cut the second shear pin, and upper cone is continued traveling downwardly, pushed away Dynamic slips stretches out, and is anchored in sleeve pipe；

When releasing grappling, oil pipe pressure release, in the presence of compression spring and the oily annulus pressure of set, piston stroking upward, and drive epicone Body moves up, and back-moving spring causes slips to shrink, and releases grappling.