CN219840594U

CN219840594U - Well feeding tool

Info

Publication number: CN219840594U
Application number: CN202321312566.9U
Authority: CN
Inventors: 刘殷韬; 王孝刚; 董海峰; 付先惠; 康杰; 兰芳
Original assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Priority date: 2023-05-26
Filing date: 2023-05-26
Publication date: 2023-10-17
Anticipated expiration: 2033-05-26

Abstract

The utility model belongs to the technical field of downhole tools, and particularly relates to a well conveying tool. A well tool, comprising: the mandrel assembly is provided with a through hole in a penetrating mode on the shaft wall of the mandrel assembly, and a ball seat for plugging is further arranged in the mandrel assembly and is positioned below the through hole; the elastic pawl is fixedly sleeved outside the mandrel assembly and comprises a fixed end and a contracted end, the fixed end is fixedly connected with the mandrel assembly, and threads for connecting the packer are arranged at the contracted end; the piston is fixedly sleeved outside the mandrel assembly through a shear pin, and is positioned between the mandrel assembly and the contraction end and used for limiting the contraction of the contraction end. The utility model can solve the problem that the traditional mechanical release of the packer in a highly inclined or horizontal well is difficult.

Description

Well feeding tool

Technical Field

The utility model belongs to the technical field of downhole tools, and particularly relates to a well conveying tool.

Background

With the development of technology, in the field of oil and gas field completion, long horizontal wells are increasing in number in order to increase oil and gas production. Well test integrated pipe columns are generally used in acid gas fields, suspended packers are generally arranged on vertical well sections in a traditional well completion scheme, well head site selection is limited in a region with relatively dense population, and after various factors are integrated, many wells are arranged on well casing sections to form highly-inclined pipe columns. This results in the need to release the tool above the first string hang packer of the completion string at a high slope or horizontal segment.

In the traditional mechanical releasing mode, torque cannot be transmitted in a large inclination or horizontal section, so that releasing is difficult to realize. There is a need for a well tool that can widen the well conditions under which a suspended packer is used, making it suitable for use not only in vertical wells, but also in highly deviated and even horizontal wells.

Disclosure of Invention

Aiming at the technical problems, the utility model aims to provide a well conveying tool which can solve the problem that the traditional mechanical release of a packer in a highly-inclined or horizontal well is difficult.

According to the present utility model there is provided a well tool capable of running a packer into a well, comprising:

the mandrel assembly is provided with a through hole in a penetrating mode on the shaft wall of the mandrel assembly, and a ball seat for plugging is further arranged in the mandrel assembly and is positioned below the through hole;

the elastic pawl is fixedly sleeved outside the mandrel assembly and comprises a fixed end and a contracted end, the fixed end is fixedly connected with the mandrel assembly, and threads for connecting the packer are arranged at the contracted end;

a piston fixedly sleeved outside the mandrel assembly through a shear pin, wherein the piston is positioned between the mandrel assembly and the contraction end and used for limiting the contraction of the contraction end, and the piston comprises a piston body, a piston body and a piston body,

the piston is configured such that the pressure inside the mandrel assembly can be transmitted to the piston through the through hole, and after pushing the piston to shear the shear pin to move, the shrinkage restriction on the shrinkage end is released, and the pressure inside the mandrel assembly is relieved through the through hole.

In a specific embodiment, the contracting end comprises a plurality of elastic ribs evenly distributed at intervals along the circumference of the fixed end.

In a specific embodiment, an included angle formed between a side of the thread close to the upper side and the diameter direction of the thread is 5-15 degrees, and an included angle formed between a side of the thread close to the lower side and the diameter direction of the thread is 45 degrees.

In a specific embodiment, the mandrel assembly comprises a first shaft section and a second shaft section which are sequentially connected from top to bottom, the outer diameter of the first shaft section is larger than that of the second shaft section, the fixed end of the elastic pawl is fixedly connected with the first shaft section, and the piston is fixedly connected with the second shaft section through a shearing pin.

In a specific embodiment, the mandrel assembly further comprises a third shaft section arranged at the lower end of the second shaft section, the lower end of the piston is in sealing connection with the third shaft section, an annulus is arranged between the piston and the third shaft section, and the through hole is communicated with the annulus and the inner cavity of the mandrel assembly.

In a specific embodiment, a support portion for abutting against the constricted end is provided on the outer wall of the lower end portion of the piston.

In a specific embodiment, the mandrel assembly comprises an upper joint, a central tube, a lower joint and a guide head which are connected in a sealing manner from top to bottom.

In a specific embodiment, 6 to 8 fluid grooves are circumferentially spaced at the maximum outer diameter of the upper joint.

In a specific embodiment, a chamfer of 45-60 degrees is provided at the lower end of the guide head.

In a specific embodiment, a seal is provided on the outer wall of the lower sub for sealing connection with the packer.

Compared with the prior art, the utility model has the following advantages.

The utility model is connected with the upper joint of the packer through the screw thread of the shrinkage end of the elastic pawl before releasing, and the shrinkage end of the elastic pawl is limited by the piston to shrink radially at the moment, so that the packer can not be separated from the elastic pawl. When releasing is needed, the ball is thrown into the ball seat of the mandrel assembly to hold pressure, the piston is pushed to move through the through hole, the shrinkage space of the elastic pawl is reserved, the limit on the shrinkage end of the elastic pawl is relieved, and meanwhile, the pressure in the inner cavity of the mandrel assembly flows out through the through hole. At the moment, the mandrel assembly is lifted up, and the packer gives a radial inward component force to the contracted end of the elastic pawl through threads, so that the contracted end of the elastic pawl is contracted, and releasing is completed.

Drawings

The present utility model will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic view of an embodiment of a well tool according to the present utility model;

FIG. 2 shows a schematic view of one embodiment of a resilient pawl according to the present utility model;

FIG. 3 shows a schematic view of a portion of the structure of a packer;

figure 4 shows a schematic of a well tool according to the utility model in connection with a packer.

In the figure: 1. a mandrel assembly; 11. a through hole; 12. a ball seat; 13. a first shaft section; 14. a second shaft section; 15. a third shaft section; 16. an upper joint; 161. a liquid flow groove; 17. a central tube; 18. a lower joint; 181. a seal; 19. a guide head; 2. an elastic pawl; 21. a fixed end; 22. a constricted end; 221. an elastic rib; 3. a piston; 31. a support part; 4. shearing pins; 5. setting ball; 10. a packer; 100. a well tool.

In the present utility model, all of the figures are schematic drawings which are intended to illustrate the principles of the utility model only and are not to scale.

Detailed Description

The utility model is described below with reference to the accompanying drawings.

It should be noted that, in the present utility model, the direction approaching the wellhead according to the present utility model is described as "up" or the like, i.e., the left side of fig. 1; while the direction away from the wellhead is described as "down" or the like, i.e., to the right of fig. 1. They are not intended to limit the absolute position of the parts involved, but may vary according to the specific circumstances.

FIG. 1 shows a schematic view of one embodiment of a well tool 100 according to the present utility model; fig. 2 shows a schematic view of an embodiment of a resilient pawl 2 according to the present utility model; FIG. 3 shows a schematic view of a portion of the structure of the packer 10; fig. 4 shows a schematic of a well tool 100 according to the present utility model in connection with a packer 10.

As shown in fig. 1, a well tool 100 includes a mandrel assembly 1 with an internal cavity, a resilient pawl 2, and a piston 3. The elastic pawl 2 is sleeved outside the mandrel assembly 1, the elastic pawl 2 comprises a fixed end 21 and a contracted end 22 which are connected with each other, the fixed end is fixedly connected with the mandrel assembly 1, and threads for connecting the packer 10 are arranged at the lower end part of the contracted end 22. There is the space between the shrink end 22 of the elastic pawl 2 and the mandrel assembly 1, the piston 3 is arranged in the space between the elastic pawl 2 and the mandrel assembly 1, the outer wall of the piston 3 is contacted with the inner wall of the shrink end 22 of the elastic pawl 2 to prevent the shrink end 22 from shrinking inwards, the inner wall of the piston 3 is contacted with the outer wall of the mandrel assembly 1, and the piston 3 is fixedly connected with the mandrel assembly 1 through the shear pin 4. The through hole 11 is penetrated and arranged on the shaft wall of the mandrel assembly 1, and the through hole 11 can transmit the pressure in the inner cavity of the mandrel assembly 1 to the piston 3, so that the piston 3 is pushed to move downwards to contact with the contact state of the elastic pawl 2, and the elastic pawl 2 can shrink radially. The outer wall of the lower end of the contracting end 22 of the elastic claw 2 is provided with a thread for connection with the packer 10, as shown in fig. 4, and the piston 3 can radially abut against the lower end of the contracting end 22 in the initial state, so that the thread of the contracting end 22 is tightly connected with the thread of the packer 10.

A ball seat 12 is also arranged in the mandrel assembly 1, and the ball seat 12 is positioned below the through hole 11. When the releasing procedure is needed, the setting ball 5 is put into the inner cavity of the mandrel assembly 1, the inner cavity of the mandrel assembly 1 is sealed, then the pressure is pumped into the inner cavity of the mandrel assembly 1 from the wellhead direction, the pressure is transmitted to the piston 3 through the through hole 11, and the piston 3 moves downwards under the pushing of the pressure, so that the contact with the elastic pawl 2 is released. At this time, the mandrel assembly 1 is lifted up to drive the elastic pawl 2 to move upwards, and the elastic pawl 2 is subjected to radial inward component force due to the action of the threads in the upward moving process, so that the elastic pawl 2 is contracted inwards, the threads of the elastic pawl 2 and the threads of the packer 10 are subjected to component force, and releasing is completed.

In a preferred embodiment, after the piston 3 moves out of contact with the resilient pawl 2 to enable the resilient pawl 2 to retract inwardly, the piston 3 moves out of the size range of the through bore 11 to release the pressure in the bore of the mandrel assembly 1 from the through bore 11 to the outside of the mandrel assembly 1 without requiring additional operations to reduce the bore pressure of the mandrel assembly 1.

As shown in fig. 2, in a specific embodiment, the contracting end 22 includes a plurality of elastic ribs 221 uniformly distributed at intervals along the circumferential direction of the fixing end 21. In the present embodiment, the number of the elastic ribs 221 is set to 6 to 8.

In a specific embodiment, the included angle between the side of the thread near the upper part and the diameter direction is 5-15 degrees, and the included angle between the side of the thread near the lower part and the diameter direction is 45 degrees.

In a specific embodiment, the mandrel assembly 1 comprises a central tube 17, the central tube 17 comprising a first shaft section 13, a second shaft section 14 and a third shaft section 15 connected in sequence from top to bottom, the first shaft section 13 having an outer diameter greater than the second shaft section 14, and the second shaft section 14 having an outer diameter greater than the third shaft section 15. The fixed end 21 of the elastic pawl 2 is fixedly connected with the first shaft section 13. The upper end of the piston 3 is fixedly connected with the second shaft section 14 through the shear pin 4, and the lower end of the piston 3 is in sealing connection with the third shaft section 15. An annulus is arranged between the piston 3 and the third shaft section 15, and the through hole 11 is communicated with the annulus and the inner cavity of the mandrel assembly 1. The upper end of the annulus is a first shaft section 13, and the lower end of the annulus is a piston 3, so that when the pressure in the mandrel assembly 1 is transmitted to the annulus through the through hole 11, the piston 3 and the first shaft section 13 are subjected to opposite force, so that the piston 3 moves downwards relative to the mandrel assembly 1, and the shear pin 4 is sheared.

In a preferred embodiment, a support 31 for abutting against the constricted end 22 is provided at the lower end of the piston 3. By controlling the axial length of the support 31, it is possible to control the piston 3 to be out of contact with the contracting end 22 after a displacement of a corresponding length has been performed.

In a specific embodiment, the mandrel assembly 1 comprises an upper joint 16, a central tube 17, a lower joint 18 and a guide head 19 which are sequentially connected in a sealing manner from top to bottom, wherein the upper joint 16, the central tube 17, the lower joint 18 and the guide head 19 are connected with each other in a threaded manner. Wherein the outer diameter of the upper joint 16 is larger than the central tube 17, the lower joint 18 and the guide head 19. 6 to 8 fluid grooves 161 are provided at a circumferential interval at the maximum outer diameter of the upper joint 16.

According to the utility model, a chamfer of 45-60 degrees is arranged at the lower end of the guide head 19, so that the tool can be conveniently put in. A seal 181 is provided on the outer wall of the lower sub 18 for sealing connection with the packer 10. As shown in fig. 4, after the packer 10 is connected to the well tool 100, a seal 181 on the lower sub 18 can seal the lower sub 18 to the packer 10.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only of a preferred embodiment of the utility model and is not to be construed as limiting the utility model in any way. Although the utility model 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 techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. 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

1. A well tool capable of running a packer (10) into a well, comprising:

the mandrel assembly (1) is provided with a through hole (11) in a penetrating mode on the shaft wall of the mandrel assembly (1), a ball seat (12) for plugging is further arranged in the mandrel assembly (1), and the ball seat (12) is located below the through hole (11);

the elastic pawl (2) is fixedly sleeved outside the mandrel assembly (1), the elastic pawl (2) comprises a fixed end (21) and a shrinkage end (22), the fixed end is fixedly connected with the mandrel assembly (1), and the shrinkage end (22) is provided with threads for connecting the packer (10);

a piston (3) fixedly sleeved outside the mandrel assembly (1) through a shear pin (4), wherein the piston (3) is positioned between the mandrel assembly (1) and the contraction end (22) and used for limiting the contraction of the contraction end (22),

the piston (3) is configured such that the internal pressure of the mandrel assembly (1) can be transmitted to the piston (3) through the through hole (11), after the piston (3) is pushed to shear the shear pin (4) to move, the shrinkage restriction on the shrinkage end (22) is released, and the internal pressure of the mandrel assembly (1) is relieved through the through hole (11).

2. A well tool according to claim 1, wherein the convergent end (22) comprises a plurality of resilient ribs (221) evenly distributed at circumferentially spaced intervals along the fixed end (21).

3. The well tool of claim 1, wherein the thread of the thread has an angle of 5-15 ° to the diameter on the side closer to the top and an angle of 45 ° to the diameter on the side closer to the bottom.

4. The well tool according to claim 1, wherein the mandrel assembly (1) comprises a first shaft section (13) and a second shaft section (14) which are sequentially connected from top to bottom, the outer diameter of the first shaft section (13) is larger than that of the second shaft section (14), the fixed end (21) of the elastic pawl (2) is fixedly connected with the first shaft section (13), and the piston (3) is fixedly connected with the second shaft section (14) through a shearing pin (4).

5. The well tool according to claim 4, wherein the mandrel assembly (1) further comprises a third shaft section (15) arranged at the lower end of the second shaft section (14), the lower end of the piston (3) is in sealing connection with the third shaft section (15), an annulus is arranged between the piston (3) and the third shaft section (15), and the through hole (11) is communicated with the annulus and the inner cavity of the mandrel assembly (1).

6. A well tool according to claim 5, characterized in that a support (31) for abutment against the constriction end (22) is provided at the outer wall of the lower end of the piston (3).

7. A well tool according to any one of claims 1-6, characterized in that the mandrel assembly (1) comprises an upper joint (16), a central tube (17), a lower joint (18) and a guide head (19) which are sealingly connected in sequence from top to bottom.

8. The well tool according to claim 7, characterized in that 6-8 fluid grooves (161) are circumferentially spaced at the maximum outer diameter of the upper joint (16).

9. A well tool according to claim 7, characterized in that a chamfer of 45-60 ° is provided at the lower end of the guide head (19).

10. A well tool according to claim 7, characterized in that a seal (181) for sealing connection with the packer (10) is provided at the outer wall of the lower joint (18).