CN218816308U

CN218816308U - Hydraulic cutting knife

Info

Publication number: CN218816308U
Application number: CN202222441426.3U
Authority: CN
Inventors: 林远航; 谭俊潇; 苏海岩; 姜大伟; 郑晨阳; 乔方; 范子涛; 王克洋; 田佳; 郑明明; 刘卓
Original assignee: CNOOC Energy Technology and Services Ltd
Current assignee: CNOOC Energy Technology and Services Ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-04-07
Anticipated expiration: 2032-09-15

Abstract

The utility model discloses a hydraulic cutting knife, which comprises a body and a top joint, wherein the lower part of the body is provided with a movable blade, and the rear part of the blade forms a barb; a piston rod is arranged in the body, and a piston spring is arranged between the piston rod and the inner wall of the body; a valve plate is embedded into the head end of the piston rod, and a check valve is arranged in the center of the valve plate; the tail end of the piston rod is provided with a baffle ring and a bulge, the bulge is positioned on one side, close to the top joint, of the baffle ring, and a groove for the barb of the blade to be embedded into is formed between the bulge and the baffle ring; centralizer mounting grooves are symmetrically formed in the body perpendicular to the axial direction of the body, centralizers are arranged in the centralizer mounting grooves, and centralizer springs are arranged between the centralizers and the wall of each centralizer mounting groove; the centralizer mounting groove is located the blade and is close to top joint one side, and the centralizer mounting groove corresponds with the bellying of piston rod, and forms the spacing groove of centralizer on the bellying. The hydraulic cutter can ensure that the cutter does not extend out of the body in the process of drilling down and drilling up, thereby ensuring smooth operation.

Description

Hydraulic cutting knife

Technical Field

The utility model relates to an oil well completion technical field, in particular to water conservancy cutting knife.

Background

In the conventional oil and gas well completion and well abandoning operation, when the pipe column cutting operation is carried out, a cutting knife pipe column needs to be put in, the cutting is carried out when the pipe column is put in to the target depth, and before the pipe column is put in, the mode that the cleaning rag strip is plugged in a gap between the cutting knife and the body is frequently adopted on site, so that the cutting knife is prevented from extending out of the body in the drilling process. In a large inclined directional well, both the cutting knife and the outer-layer pipe column have edge sticking phenomena, and the condition that the outer-layer pipe column continues to be abraded after the target pipe column is cut in the cutting process is probably caused due to large margin of the length of the cutting knife. In addition, after cutting operation, the cutting knife is not stressed in the drill tripping process, the condition that the cutting knife causes drill jamming exists, once the drill tripping occurs or the cutting knife stretches out in the drill tripping process to cause the jamming condition, the operation timeliness can be seriously influenced, and the whole operation is influenced.

Therefore, the tool which can effectively guarantee that the cutting knife enters the lower part and the body is withdrawn in the process of pulling out the cutting knife after cutting is absent at present, so that the smooth construction in the process of pulling out the drill is guaranteed, and the normal operation is guaranteed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve unable effective restraint cutting knife among the prior art, lead to having played to bore the in-process and exist because the cutting knife stretches out the card condition that hinders that the body arouses, seriously influence the operation ageing, influence the problem of whole operation, provide a water conservancy cutting knife.

The application is realized by adopting the following technical scheme.

A hydraulic cutting knife comprises a body and a top connector connected with the body, wherein a movable blade is arranged at the lower part of the body, a barb is formed at the rear part of the blade, a piston rod is arranged in the body, and a piston spring is arranged between the piston rod and the inner wall of the body; a valve plate is embedded into the head end of the piston rod, and a check valve is arranged in the center of the valve plate; the tail end of the piston rod is provided with a baffle ring and a convex part, the convex part is positioned on one side of the baffle ring close to the top joint, and a groove for the barb of the blade to be embedded into is formed between the convex part and the baffle ring; the body is symmetrically provided with centralizer mounting grooves perpendicular to the axial direction of the body, centralizers are arranged in the centralizer mounting grooves, and centralizer springs are arranged between the centralizers and the groove walls of the centralizer mounting grooves; the centralizer mounting groove is located the blade and is close to top joint one side, and the centralizer mounting groove corresponds with the bellying of piston rod, and forms the spacing groove of centralizer on the bellying.

Furthermore, the head end of the piston rod is provided with a boss, and a first sealing ring is arranged between the outer wall of the boss and the inner wall of the body.

Furthermore, the valve plate is T-shaped, and a second sealing ring is arranged between the outer wall of the tail end of the valve plate and the inner wall of the head end of the piston rod.

Furthermore, the blade is movably connected to the body through a cutting knife pin.

The present application has the following advantageous effects.

The hydraulic cutter can ensure that the cutter does not extend out of the body in the process of drilling down and drilling up, thereby ensuring smooth operation. In addition, the centering degree of a cutting knife is guaranteed due to the arrangement of the centralizer, and the abrasion of the outer-layer pipe column is effectively prevented. The setting of single current valve can the utility model discloses the water conservancy cutting knife is bored and is cut the back and play the drilling in-process, prevents that well fluid from bringing into debris and blockking up circulation channel. The utility model discloses simple structure, easy to maintain, application prospect is wide.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Wherein, 1, a top joint; 2. a body; 3. a valve plate; 4. a piston rod; 5. a centralizer spring; 6. cutting knife pins; 7. a pin; 8. a blade; 9. a check valve; 10. a first seal ring; 11. a second seal ring; 12. a piston spring; 13. a centralizer; 14. and (4) a baffle ring.

Detailed Description

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

As shown in fig. 1, a hydraulic cutter comprises a body 2 and a top joint 1 connected with the body 2. The lower part of body 2 is equipped with blade 8, and blade 8 passes through cutting knife pin 6 to be connected on body 2, and blade 8 can follow cutting knife pin 6 and rotate certain angle, makes blade 8 stretch out body 2 or withdraw body 2. The head end of the blade 8 is shaped as a cutting part, and the rear part of the tail end of the blade 8 is provided with a barb for limiting.

A piston cavity is formed in one side, close to the top connector 1, in the body 2, a piston rod 4 is arranged in the piston cavity, and a central water hole is formed in the center of the piston rod 4. Piston rod 4 includes the boss that the body of rod and body of rod head formed, and correspondingly, the inner wall in the piston chamber of body 2 is the echelonment. The body of rod of piston rod 4 is overlapped and is equipped with piston spring 12, and piston spring 12 one end and boss contact, the diapire contact in the other end and piston chamber. A first sealing ring 10 is arranged between the outer wall of the boss of the piston rod 4 and the inner wall of the body 2, so that the sealing performance of the piston is guaranteed.

This application imbeds valve plate 3 in the head end of piston rod 4, and valve plate 3 is the T style of calligraphy, and in the tail end embedding piston rod 4's of T style of calligraphy valve plate 3 head end promptly, in order to guarantee the leakproofness of piston, be equipped with second sealing washer 11 between the tail end outer wall of valve plate 3 and the piston rod 4 head end inner wall. Valve plate 3's central authorities are equipped with single current valve 9, and the setting of single current valve 9 can the utility model discloses the water conservancy cutting knife is bored and is cut the back and play the drilling in-process, prevents that well liquid from bringing into debris and blockking up circulation channel.

The tail end of the piston rod 4 penetrates through the piston cavity, and a stop ring 14 is fixed at the tail end of the piston rod 4 through a pin 7; and a convex part is further formed on the piston rod 4 and is positioned on one side of the baffle ring 14 close to the top connector 1, and a groove for the barb of the blade 8 to be embedded is formed between the convex part and the baffle ring 14.

Four centralizer installing grooves are symmetrically arranged on the body 2 perpendicular to the axis direction of the body, the centralizer installing grooves are located on the same circumferential surface, a centralizer 13 is arranged in each centralizer installing groove, a limiting block is arranged at the bottom end of each centralizer 13, and a centralizer spring 5 is arranged between each centralizer 13 and the wall of each centralizer installing groove; this application centralizer mounting groove is located blade 8 and is close to top connection 1 one side, and the centralizer mounting groove forms the spacing groove on the bellying corresponding to the bellying of piston rod 4. When the centralizer is not in operation, the limiting block at the bottom end of the centralizer 13 is embedded into the limiting groove, and at the moment, the centralizer 13 is positioned in the body 2 or protrudes out of a small part of the body 2.

The working principle of the utility model is as follows: will the utility model discloses in going into the pit shaft down, the in-process of drilling down, cooperate by piston rod 4, piston spring 12, fender ring 14, can effectively retrain the cutting knife, ensure that the cutting knife does not stretch out body 2, can effectively guarantee that the process of going into is smooth and easy. After the pipe is drilled to the designed cutting depth, the pipe column is rotated positively, the pump is started to circulate positively, the fluid pushes the piston rod 4 to move downwards, the piston rod 4 moves downwards, the centralizer 13 and the blade 8 are pushed out of the body 2, and the external pipe column is cut along with the rotation of the pipe column. After cutting is finished, the phenomenon that the pump pressure is reduced can be observed, meanwhile, the centering degree of a cutting knife is ensured by the centering device 13, and the cutting knife cannot cause the abrasion of a sleeve or other outer-layer tubular columns by the cutting knife due to well deviation; after the cutting is confirmed to be completed, the pump is stopped, the piston rod 4 moves upwards under the action of the piston spring 12 to drive the blade 8 to be retracted into the body 2, and meanwhile, under the action of the centralizer spring 5, the centralizer 13 is retracted, so that the cutter does not extend out of the body 2 in the drilling process, and the smooth operation is guaranteed.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a water conservancy cutting knife, includes body (2) and top connector (1) be connected with body (2), and the lower part of body (2) is equipped with movable blade (8), and the rear portion of blade (8) forms barb, its characterized in that: a piston rod (4) is arranged in the body (2), and a piston spring (12) is arranged between the piston rod (4) and the inner wall of the body (2); a valve plate (3) is embedded into the head end of the piston rod (4), and a check valve (9) is arranged in the center of the valve plate (3); the tail end of the piston rod (4) is provided with a baffle ring (14) and a protruding part, the protruding part is positioned on one side, close to the top connector (1), of the baffle ring (14), and a groove for the barb of the blade (8) to be embedded into is formed between the protruding part and the baffle ring (14); centralizer mounting grooves are symmetrically formed in the body (2) in a direction perpendicular to the axis direction of the body, centralizers (13) are arranged in the centralizer mounting grooves, and centralizer springs (5) are arranged between the centralizers (13) and the walls of the centralizer mounting grooves; the centralizer mounting groove is located blade (8) and is close to top joint (1) one side, and the centralizer mounting groove corresponds with the bellying of piston rod (4), and forms the spacing groove of centralizer (13) on the bellying.

2. The hydraulic cutter according to claim 1, characterized in that: the head end of the piston rod (4) is provided with a boss, and a first sealing ring (10) is arranged between the outer wall of the boss and the inner wall of the body (2).

3. The hydraulic cutter according to claim 1, characterized in that: the valve plate (3) is T-shaped, and a second sealing ring (11) is arranged between the outer wall of the tail end of the valve plate (3) and the inner wall of the head end of the piston rod (4).

4. The hydraulic cutter as set forth in claim 1, wherein: the blade (8) is movably connected to the body (2) through a cutting knife pin (6).