CN213684041U

CN213684041U - Centering type casing cutting knife

Info

Publication number: CN213684041U
Application number: CN202022216355.8U
Authority: CN
Inventors: 姜亦辉; 丁庆利
Original assignee: TIANHE OIL GROUP HUIFENG PETROLEUM EQUIPMENT CO Ltd
Current assignee: TIANHE OIL GROUP HUIFENG PETROLEUM EQUIPMENT CO Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-07-13
Anticipated expiration: 2030-09-28

Abstract

The utility model discloses a righting type sleeve pipe cutting knife, including the outside subassembly, piston assembly and cutting assembly, the outside subassembly is including righting the joint, main part and right the guide shoe, right joint screw thread and install in the one end of main part inboardly, right the guide shoe screw thread and install in the other end outside of main part, piston assembly includes the piston body, a spring, water injection well choke and lower nozzle, the piston body outside is located to the spring housing, its one end is inconsistent with the other end lateral part of piston body, the other end is inconsistent with the inner wall of main part, the water injection well choke is installed in the one end middle part of piston body, the other end middle part in the piston body is installed to the lower nozzle, cutting assembly includes cutter and round pin axle, the round pin axle is installed in the tip of lower. This scheme, according to the difference of sleeve pipe internal diameter, uses to right and connects and right guide shoe, and their external diameter is little with sleeve pipe internal diameter clearance, lets the cutter can be at the intraductal stable rotation of cover, has reduced to rock and cutter damage.

Description

Centering type casing cutting knife

Technical Field

The application relates to the technical field of casing cutting, in particular to a centralizing type casing cutting knife.

Background

In the oil drilling and well repairing operation, a casing cutting tool is used, the outer diameter of a common casing cutter is much smaller than the inner diameter of a casing to be cut, and when the casing cutter cuts the casing, the cutter can shake in the casing, so that a blade is broken due to impact, the cutting process is adversely affected, the cutting efficiency is reduced, and the time cost and the cutter cost of the cutting operation are increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a centralizing type casing cutting knife to solve the problem of proposing in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a centralizing type casing cutting knife comprises an outer assembly, a piston assembly and a cutting assembly.

The external component comprises a centering joint, a main body and a centering guide shoe, a first through hole is formed in the centering joint, the centering joint is installed on the inner side of one end of the main body in a threaded manner, the centering guide shoe is installed on the outer side of the other end of the main body in a threaded manner, a second through hole is formed in the middle of the main body, the first through hole is communicated with the second through hole, the piston component comprises a piston body, a spring, a water nozzle and a lower nozzle, the piston body is installed on the inner side of the main body in a sliding manner, the spring is sleeved on the outer side of one end of the piston body, one end of the spring is abutted against the side of the other end of the piston body, the other end of the spring is abutted against the inner wall of the main body, a third through hole is formed in the middle of the piston body, the water nozzle is installed in the middle of one end of, the water nozzle and the nozzles are respectively communicated with the third through hole, the cutting assembly comprises a cutter and a pin shaft, the pin shaft is arranged on the inner side of the end part of the lower nozzle, the cutter is rotatably arranged on the outer side of the pin shaft, and the cutter extends out of the side part of the main body.

In an embodiment of the present invention, the through hole matched with the cutter is formed on the side portion of the main body, and the outer wall of the main body is a smooth surface.

In an embodiment of the present invention, the centering joint includes a sleeve and a first wear-resistant coating, the outer wall of the sleeve is provided with an outer convex portion, and the first wear-resistant coating covers the outer wall of the outer convex portion.

In an embodiment of the present invention, the outer convex portion is spirally disposed, and the outer convex portion is disposed at least four relative to the annular array of casing pipes.

The utility model discloses an in one embodiment, it sets up flutedly to right guide one end, right the inside of guide and seted up fourth through-hole, the fourth through-hole with the recess intercommunication, the recess with main part threaded connection.

In an embodiment of the present invention, the outer wall of the guide shoe is provided with a second wear-resistant coating.

In an embodiment of the present invention, the cutter is provided with at least three cutter blades.

To sum up, owing to adopted above-mentioned technique, the beneficial effects of the utility model are that:

in the utility model, when in use, the casing cutter is put into a well, the proper centralizing joint and the centralizing guide shoe are used according to the difference of the casing inner diameter, the outer walls of the centralizing joint and the centralizing guide shoe are provided with wear-resistant coatings, the clearance between the outer diameter of the centralizing joint and the casing inner diameter is small, the cutter is stably rotated in the casing, the unfavorable shaking of the cutter and the damage of the cutter point of the cutter caused by impact are reduced, during cutting, the drilling fluid is injected from the through hole in the centralizing joint, the drilling fluid generates pressure difference through the water nozzle, the piston body moves down to compress the spring, simultaneously lower nozzle begins to promote the cutter and outwards opens and cut the sleeve pipe, and the back is accomplished in the cutting, stops the supply of drilling fluid, and the piston body resets under the effort of spring, and lower nozzle no longer promotes the cutter, and the cutter is inwards rotated under the effect of dead weight and resets, withdraws the cutting knife, has improved the efficiency and the success rate of cutting.

Drawings

Fig. 1 is a schematic front view of a centralizing type casing cutter provided according to an embodiment of the application;

fig. 2 is a front sectional structural view of a centralizing type casing cutter provided according to an embodiment of the application;

fig. 3 is a schematic cross-sectional view of a piston assembly of a centralizing casing cutter according to an embodiment of the application;

fig. 4 is a schematic cross-sectional view of a cutting assembly of a centralizing casing cutter provided in accordance with an embodiment of the present application;

fig. 5 is a cross-sectional schematic view of a centralizing joint of an outer assembly of a centralizing casing cutter provided in accordance with an embodiment of the present application.

In the figure: 1. an external component; 2. a piston assembly; 3, cutting the assembly; 11. righting the joint; 12. a main body; 13. righting the guide shoe; 14. a first through hole; 15. a second through hole; 21. a piston body; 22. a spring; 23. a water nozzle; 24. a lower nozzle; 25. a third through hole; 31. a cutter; 32. a pin shaft; 60. a through hole; 111. a sleeve; 112. a first wear resistant coating; 113. an outer convex portion; 131. a groove; 132. a fourth via hole; 133. a second wear resistant coating.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific situation of the specification.

Example 1

Please refer to fig. 1-5, the utility model provides a centralizing type casing cutting knife, including external component 1, piston assembly 2 and cutting assembly 3, piston assembly 2 installs in the inside of external component 1,

cutting assembly

3 and 2 threaded connection of piston assembly, and wherein, external component 1 is used for supporting and centralizing holistic, and piston assembly 2 is used for promoting cutting assembly 3, and cutting assembly 3 is used for cutting.

The external component 1 comprises a centralizing joint 11, a main body 12 and a centralizing guide shoe 13, the centralizing joint 11 comprises a sleeve 111 and a first wear-resistant coating 112, the outer wall of the sleeve 111 is provided with an outer convex part 113, the first wear-resistant coating 112 covers the outer wall of the outer convex part 113, the outer wall of the centralizing guide shoe 13 is provided with a second wear-resistant coating 133, when the centralizing joint is specifically arranged, the first wear-resistant coating 112 and the second wear-resistant coating 133 are made of inlaid hard alloy or welded wear-resistant alloy, so that the unfavorable shaking of cutting during working is reduced, a first through hole 14 is formed in the centralizing joint 11, drilling fluid is injected from the first through hole 14 during cutting, the middle part of the main body 12 is provided with a second through hole 15, the first through hole 14 is communicated with the second through hole 15, a fourth through hole 132 is formed in the centralizing guide shoe 13, the fourth through hole 132 is communicated with the second through hole 15 for the circulation of the drilling fluid, the centraliz, one end of the centering guide shoe 13 is provided with a groove 131 communicated with the fourth through hole 132, and the groove 131 is in threaded connection with the outer side of the other end of the main body 12.

The piston assembly 2 comprises a piston body 21, a spring 22, a water nozzle 23 and a lower nozzle 24, the piston body 21 is slidably mounted on the inner side of the main body 12, the spring 22 is sleeved on the outer side of one end of the piston body 21, one end of the spring 22 abuts against the side part of the other end of the piston body 21, the other end of the spring 22 abuts against the inner wall of the main body 12, a third through hole 25 is formed in the middle of the piston body 21, the water nozzle 23 is threadedly mounted in the middle of one end of the piston body 21, the lower nozzle 24 is threadedly mounted in the middle of the other end of the piston body 21, the water nozzle 23 and the lower nozzle 24 are respectively communicated with two ends of the, the drilling fluid generates pressure difference through the water nozzle 23, the piston body 21 moves downwards to compress the spring 22 to push the cutting assembly 3, when the cutting operation is finished, the piston body 21 is reset under the action of the spring 22 and the cutting assembly 3 is retracted under its own weight.

The cutting assembly 3 comprises a cutter 31 and a pin shaft 32, the pin shaft 32 is arranged on the inner side of the end part of the lower nozzle 24, the cutter 31 is rotatably arranged on the outer side of the pin shaft 32, a through hole 60 matched with the cutter 31 is formed in the side part of the main body 12, and the cutter 31 extends out of the side part of the main body 12 through the pushing of the piston assembly 2 during cutting.

The working principle is as follows: during the use, the casing cutting knife is put in the well, the adjustment is right the external diameter of joint 11 and right guide shoe 13 and is cut the sheathed tube internal diameter clearance, inject into drilling fluid from first through-hole 14, drilling fluid flows through second through-hole 15 and flows into third through-hole 25, produce sufficient pressure differential through water injection well choke 23, piston body 21 moves down compression spring 22, lower nozzle 24 promotes cutter 31 and outwards opens to cut the casing, after the cutting is accomplished, the supply of drilling fluid stops, piston body 21 can reset under the effort of spring 22, lower nozzle 24 no longer promotes cutter 31, cutter 31 then inwards rotate under the effect of dead weight and reset, the casing cutting knife is proposed from the well.

It should be noted that: the model specification of the cutter 31 needs to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Claims

1. The utility model provides a centralizing type casing cutting knife which characterized in that includes:

the external component (1) comprises a righting joint (11), a main body (12) and a righting guide shoe (13), wherein a first through hole (14) is formed in the righting joint (11), the righting joint (11) is installed on the inner side of one end of the main body (12) in a threaded mode, the righting guide shoe (13) is installed on the outer side of the other end of the main body (12) in a threaded mode, a second through hole (15) is formed in the middle of the main body (12), and the first through hole (14) is communicated with the second through hole (15);

the piston assembly (2) comprises a piston body (21), a spring (22), a water nozzle (23) and a lower nozzle (24), the piston body (21) is slidably mounted on the inner side of the main body (12), the spring (22) is sleeved on the outer side of one end of the piston body (21), one end of the spring (22) is abutted to the side of the other end of the piston body (21), the other end of the spring (22) is abutted to the inner wall of the main body (12), a third through hole (25) is formed in the middle of the piston body (21), the water nozzle (23) is mounted in the middle of one end of the piston body (21), the lower nozzle (24) is mounted in the middle of the other end of the piston body (21), and the water nozzle (23) and the lower nozzle (24) are respectively communicated with the third through hole;

the cutting assembly (3) comprises a cutter (31) and a pin shaft (32), the pin shaft (32) is installed on the inner side of the end part of the lower nozzle (24), the cutter (31) is rotatably installed on the outer side of the pin shaft (32), and the cutter (31) extends out of the side part of the main body (12).

2. The centralizing type casing cutter according to claim 1, characterized in that: the lateral part of main part (12) seted up with through hole (60) of cutter (31) complex, the outer wall of main part (12) sets up to the smooth surface.

3. The centralizing type casing cutter according to claim 2, characterized in that: the centralizing joint (11) comprises a sleeve (111) and a first wear-resistant coating (112), an outer convex part (113) is arranged on the outer wall of the sleeve (111), and the first wear-resistant coating (112) covers the outer wall of the outer convex part (113).

4. The centralizing type casing cutter according to claim 3, characterized in that: the outer convex parts (113) are arranged in a spiral shape, and at least four outer convex parts (113) are arranged relative to the annular array of the sleeve (111).

5. The centralizing type casing cutter according to claim 1, characterized in that: one end of the centering guide shoe (13) is provided with a groove (131), a fourth through hole (132) is formed in the centering guide shoe (13), the fourth through hole (132) is communicated with the groove (131), and the groove (131) is in threaded connection with the main body (12).

6. The centralizing type casing cutter according to claim 1, characterized in that: and a second wear-resistant coating (133) is arranged on the outer wall of the righting guide shoe (13).

7. The centralizing type casing cutter according to claim 1, characterized in that: the cutter (31) is provided with at least three cutter blades.