CN218542199U - Liner hanger - Google Patents

Abstract

The utility model provides a liner hanger, which comprises a tubular body, wherein a channel for fluid circulation is arranged in the body, and slips are arranged on the outer wall of the body; the elastic piece is arranged between the slips and the body, can expand under the pushing of external force to push the slips to expand outwards, and is connected with the power element which can push the elastic piece and is connected to the elastic piece and the slips. And a protective element is arranged on the outer side of the slips, and the slips can rotate relative to the protective element, so that the protective element has a first state for limiting the slips to be expanded outwards and a second state for allowing the slips to be expanded outwards. A conversion element capable of converting linear motion into circumferential rotation is arranged between the slips and the power element, so that the power element can drive the slips to rotate relative to the protection piece.

Description

Liner hanger

Technical Field

The utility model relates to an oil recovery field, concretely relates to liner hanger.

Background

A liner hanger is one of the downhole tools commonly used today during the production of oil wells. The liner hanger can be divided into three types, namely a mechanical type, a hydraulic type and a hydraulic mechanical double-acting type according to different sitting and hanging modes, wherein the hydraulic liner hanger is most widely applied.

The hydraulic liner hanger presses through the pipe, and the slip mechanism is pushed to realize sitting and hanging after the hydraulic cylinder of the liner hanger is started. However, in the running process of the casing for well cementation operation, slips on the liner hanger, especially the slips of the slips, are prone to being worn or damaged, leading to the situation of being hung or not being hung firmly in advance, and seriously affecting normal oil production operation.

SUMMERY OF THE UTILITY MODEL

To the technical problem as described above, the present invention aims to provide a liner hanger. The utility model discloses a liner hanger's simple structure can prevent effectively that the tooth of the tile on slips and the slips from taking place wearing and tearing or destruction.

According to the utility model, a liner hanger is provided, which comprises a tubular body, a channel for fluid circulation is arranged in the body, and slips are arranged on the outer wall of the body; the elastic piece is arranged between the slip and the body, can expand under the pushing of external force, pushes the slip to expand outwards, and is connected with the power element which can push the elastic piece and is arranged on the elastic piece and the slip.

And the outside of the slips is also provided with a protective piece, and the slips can rotate relative to the protective piece, so that the protective piece has a first state for limiting the slips to expand outwards and a second state for allowing the slips to expand outwards. A conversion element capable of converting linear motion into circumferential rotation is arranged between the slips and the power element, so that the power element can drive the slips to rotate relative to the protection piece.

In a preferred embodiment, the protective element is cylindrical and at least one gap is provided on the outer circumferential surface of the stop element, through which slips can pass.

In a preferred embodiment, the power element is provided as a hydraulic cylinder communicating with the passage through a through hole in the body, and a ball seat is provided in the passage downstream of the through hole for receiving and being capable of being set by a sealing ball.

In a preferred embodiment, a righting ring capable of bearing the power element is further arranged on the outer wall of the body on the lower side of the power element.

In a preferred embodiment, a fastener capable of preventing the power element from rotating is further arranged between the power element and the righting ring.

In a preferred embodiment, the spring element is configured as a leaf spring and the conversion element is configured as a ball screw.

In a preferred embodiment, a plate spring seat is further arranged between the elastic part and the conversion element, and a pressure distributing plate is further connected between the plate spring seat and the power element.

In a preferred embodiment, the plate spring seat is further provided with a clamping groove which is approximately T-shaped, and a connecting part which can be inserted into the clamping groove is arranged at the lower end of the slip.

In a preferred embodiment, a falling prevention stopper is further provided on the body of the lower end of the righting ring.

In a preferred embodiment, a groove is further formed at the lower end of the centralizing ring, and the upper end of the anti-falling block extends into the groove.

Drawings

The present invention will be described with reference to the accompanying drawings.

Fig. 1 shows a schematic view of a liner hanger according to an embodiment of the present invention.

FIG. 2 is a schematic view of the liner hanger shield shown in FIG. 1.

FIG. 3 is a schematic view of the connection of the leaf spring seat and the slip.

In the present application, all the figures are schematic and are only intended to illustrate the principles of the present invention and are not drawn to scale.

Detailed Description

The present invention will be described with reference to the accompanying drawings. Hereinafter, the "upper end", "upper side" or the like means an end, a side directed toward the wellhead; the term "lower end", "lower side" or the like refers to the end, side, remote from the wellhead; the term "outside" or the like denotes the side remote from the body.

Fig. 1 shows a schematic view of a liner hanger 100 according to an embodiment of the present invention. As shown in FIG. 1, the liner hanger 100 includes a tubular body 10 connected to a down hole tubing (not shown). A channel 20 is defined in the body 10 in fluid communication.

As shown in fig. 1, slips 30 are further provided outside the body 10. Meanwhile, an elastic member 32 is provided between the slips 30 and the body 10, and the elastic member 32 is preferably provided as a leaf spring. A power element 40 is also provided below the elastic member 32. The power element 40 can push the elastic member 32 upwards, so that the elastic member 32 is deformed, and then the elastic member 32 can push the slips 30 to move outwards until the slips 30 abut against the inner wall (not shown) of the oil well, and the liner hanger can be set and hung underground.

As shown in fig. 1, a guard 50 is further provided outside the body 10. The guard 50 is sleeved outside the slips 30. Thus, when the liner hanger 100 is run into the well, the protective member 50 can be wrapped around the outside of the slips 30, thereby protecting the slips 30 and preventing the slips 30, especially the slip teeth 35 on the slips 30, from being hit by downhole debris or irregular well walls. Thus, by this arrangement, the slips 30 are effectively protected from damage to the slips 30 during entry into the well.

FIG. 2 is a schematic view of the guard 50 of the liner hanger 100 shown in FIG. 1. As shown in fig. 3, the guard 50 is provided in a cylindrical shape. The guard 50 is provided with a circular hole 52 through which the body 10 can be inserted. Meanwhile, the lower end of the guard 50 is formed as an opening 55 so that the slips 30 and the elastic member 32 can be protruded into the guard 50 through the opening 55 so as to be positioned between the body 10 and the guard 50.

Also, a gap 38 is provided on the outer circumferential surface 36 of the slip 30. Meanwhile, the slips 30 are provided in a bar shape or a plate shape. Thus, during rotation of the slips 30 relative to the guard 50, when the slips 30 are rotated to a position opposite the gap 38, they can pass through the gap 38 and can abut against the inner wall of the well. When the slips 30 are rotated to a position not opposite to the gap 38, the slips 30 can be always positioned at the inner side of the protection piece 50 close to the body 10 under the limit of the protection piece 50, so that the protection piece 50 can play a role of protecting the slips 30.

It should be noted that the gap 38 and the slips 30 may be provided as one or a plurality of one-to-one correspondence, and the plurality of gaps 38 and the slips 30 may be uniformly arranged on the outer peripheral surface 36 and the outer wall of the body 10, which is not limited herein.

As shown in fig. 1, a conversion element 60 is disposed between the slips 30 and the power element 40. The conversion element 60 is preferably provided as a ball screw structure which is capable of converting a linear motion into a rotational motion. Thus, when the power element 40 moves upward to push the elastic member 32 to deform, the conversion element 60 can convert the linear movement of the power element 40 along the axial direction of the body 10 into a rotational movement, thereby rotating the slips 30 relative to the protection member 50. After the slips 30 are rotated from the initial position not opposite to the gap 38 to the position opposite to the gap 38, the slips 30 are pressed out of the protection member 50 by the elastic member 32, so as to abut against the well wall, thereby completing the setting.

It should be noted that such a ball screw structure is well known to those skilled in the art, and a detailed description thereof will be omitted.

As shown in fig. 1, in a preferred embodiment, a plate spring seat 65 is further disposed between the elastic member 32 and the conversion element 60. The plate spring seat 65 is a circular plate body which is sleeved on the outer wall of the body 10 and can rotate relative to the body 10. The lower ends of the slips 30 are attached to the leaf spring block 65.

Thus, when the conversion element 60 pushes the slips 30 and the elastic member 32 to move under the driving of the power element 40, the torque applied by the conversion element 60 can first pass through the leaf spring seat 65 and then act on the slips 30 and the elastic member 32. Thereby, the plate spring seat 65 can prevent the rotating rod 601 of the conversion element 60 having a small diameter from directly pressing the elastic member 32 and the slips 30, causing damage to the elastic member 32 and the slips 30.

Further, a pressure dividing plate 66 is connected between the plate spring seat 65 and the conversion element 60, and the pressure dividing plate 66 is provided outside the rotating rod 66. The pressure dividing plate 66 can increase the contact area between the plate spring seat 65 and the conversion element 60, thereby reducing the pressure applied to a single point on the plate spring seat 65 and preventing the plate spring seat 65 from being damaged by the pressure.

Fig. 3 is a schematic view of the connection of the leaf spring seat 65 to the slips 30. As shown in fig. 3, a latching groove 68 is also provided on the plate spring seat 65, and the latching groove 68 is substantially "T" shaped. Meanwhile, a connection portion 69, which can be inserted into the catching groove 68 and is fixedly connected to the catching groove 68, is provided at a lower end of the slip 30. Obviously, the connecting part 69 of the clamping groove 68 can strengthen the connection between the slip 30 and the plate spring seat 65 under the condition of separable maintenance, and the slip 30 and the plate spring seat 65 can always keep synchronous rotation during the rotation of the plate spring seat 65.

As shown in fig. 1, in the present invention, the power element 40 is provided as a hydraulic cylinder 42. The hydraulic cylinder 42 is communicated with the first passage 20 through a through hole 12 formed in the outer wall of the body 10, so that the high-pressure liquid in the first passage 20 can enter the hydraulic cylinder 42 through the through hole 12, and a piston (not shown) in the hydraulic cylinder 42 is pushed to move, thereby pushing the conversion element 60 to move.

At the same time, a ball seat (not shown) capable of being set by a sealing ball (not shown) is also provided in the first passage 20 downstream of the through hole 12. Therefore, when the hydraulic cylinder 42 needs to be pushed to move, a sealing ball is put into the well to close the first channel 20, so that high-pressure fluid can be introduced into the hydraulic cylinder 42 to push the piston in the hydraulic cylinder 42 to move.

Through the arrangement, on one hand, the pressure of the downhole fluid can be fully utilized, and other pressurizing devices are prevented from being introduced, so that the structure is simplified, and the cost is reduced. On the other hand, the operator may also control the pressure at which the hydraulic cylinder 42 pushes the conversion element 60 to move according to the pressure of the regulated downhole fluid, thereby making the liner hanger 100 of the present invention suitable for different well conditions.

As shown in fig. 1, a stabilizing ring 70 is further provided on the outer wall of the body 10 on the lower side of the power member 40. The centralizing ring forms a fixed connection with both the body 10 and the power element 40. Therefore, the centralizing ring 70 can support and centralize the power element 40, and prevent the pressure of the high-pressure fluid from influencing the power element 40 when the liner hanger 100 is seated, so as to prevent the power element 40 from shaking.

Further, a fastener 75 is disposed between the centralizing ring 70 and the power element 40, and the fastener 75 may be a snap spring, for example. Thus, when rotational torque on the conversion member 60 is transmitted to the power member 40, the fastener 75 can act as a fastener to prevent the power member 40 from rotating, which could affect the normal seating of the liner hanger 100.

In addition, in a preferred embodiment, a falling prevention stopper 76 is further provided on the body of the lower end of the stabilizing ring 70. The drop stop 76 is formed in a ring shape and is fixedly coupled to the body 10 by welding or the like. The anti-falling block 76 can support the power element 40 and the righting ring 70, and prevent the devices from falling off under the action of external force, so that fish falling accidents are avoided.

Further, a groove 78 is provided at the lower end of the centralizing ring 70. So that the upper end of the drop stop 76 can protrude into the groove 78 and form a snap fit, thereby allowing the drop stop 76 to be more securely attached to the centralizing ring 70.

The operation of the liner hanger 100 according to the present invention is briefly described as follows.

The utility model discloses a liner hanger 100 is used for installing on the tail pipe of oil well, realizes sitting of tail pipe and hangs. The guard 50 protects the slips 30 during tripping of the liner hanger 100 into the well.

When the liner hanger 100 reaches a predetermined downhole location along with the liner, a sealing ball may be dropped into the well to seat the first passageway 20. After the first passage 20 is closed, high-pressure fluid such as drilling fluid in the well enters the hydraulic cylinder 42, and pushes the piston in the hydraulic cylinder 42 to move upwards. During this process, the hydraulic cylinder pushes the elastic member 32 to be elastically deformed, and the slips 30 are rotated relative to the guard member 50 by the conversion member 60.

After the slips 30 are rotated from an initial position not opposite the gap 38 to a position opposite the gap 38. The resiliently deformed resilient member 32 will urge the slips 30 out of the gap 38, causing the slips 30 to abut the borehole wall, completing the ride.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A liner hanger, comprising:

a tubular body (10) having a fluid-communicating channel (20) therein, slips (30) being provided on an outer wall of the body;

a resilient member (32) disposed between the slips and the body, the resilient member capable of expanding under the urging of an external force, urging the slips outwardly, and,

a power element (40) connected to the spring and the slips and capable of pushing the spring,

wherein a protective element (50) is arranged at the outer side of the slips, the slips can rotate relative to the protective element, so that the protective element has a first state for limiting the slips to be expanded outwards and a second state for allowing the slips to be expanded outwards,

a conversion element (60) capable of converting linear motion into circumferential rotation is arranged between the slips and the power element, so that the power element can drive the slips to rotate relative to the protection piece.

2. The liner hanger according to claim 1, wherein the guard is configured as a cylinder, and at least one gap (58) through which slips can pass is provided on an outer circumferential surface (56) of the guard.

3. The liner hanger according to claim 2, wherein the power element is provided as a hydraulic cylinder (42) communicating with the passageway through a through hole (12) in the body,

a ball seat is disposed in the passage downstream of the through bore for receiving and being sealable by a sealing ball to form a setting.

4. The liner hanger according to claim 3, wherein there is further provided on the outer wall of the body on the underside of the motive element a centralizing ring (70) capable of carrying the motive element.

5. The liner hanger according to claim 4, wherein a fastener (75) capable of preventing rotation of the power element is further provided between the power element and the centralizing ring.

6. The liner hanger according to any one of claims 1-5, wherein the resilient member is provided as a leaf spring and the conversion element is provided as a ball screw.

7. The liner hanger according to any one of claims 1-5, wherein a leaf spring seat (65) is further provided between the resilient member and the conversion element, and a pressure distributing plate (66) is further connected between the leaf spring seat and the power element.

8. The liner hanger according to claim 7, wherein a catch (68) is further provided on the leaf spring seat, the catch being configured in a "T" shape,

and a connecting part (69) which can be inserted into the clamping groove is arranged at the lower end of the slip.

9. The liner hanger according to claim 4 or 5, wherein a drop-preventing stop (76) is further provided on the body of the lower end of the centralizing ring.

10. The liner hanger according to claim 9, wherein a recess (78) is further provided at a lower end of the centralizing ring, and an upper end of the anti-drop block extends into the recess.

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