CN215485939U

CN215485939U - Casing section milling device

Info

Publication number: CN215485939U
Application number: CN202120624404.3U
Authority: CN
Inventors: 张志敏; 张其松; 陈庆民; 王国军; 张文鹏; 王彦勇
Original assignee: DOWNHOLE SPECIAL OPERATION Co OF SINOPEC ZHONGYUAN ENGINEERING Ltd; Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: DOWNHOLE SPECIAL OPERATION Co OF SINOPEC ZHONGYUAN ENGINEERING Ltd; Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2021-03-26
Filing date: 2021-03-26
Publication date: 2022-01-11
Anticipated expiration: 2031-03-26

Abstract

The utility model provides a casing section milling device which comprises a cylinder body, an upper piston (51) and a lower piston (52) which are positioned in the cylinder body and connected through a piston rod, wherein the upper piston is positioned in a first water cavity (41), the lower piston is positioned in a second water cavity (42), and a reversing device in the cylinder body is used for changing fluid from flowing to the first water cavity to flowing to the second water cavity. The wall of barrel is seted up along radial extended through-hole, wears to be equipped with milling piece (7) in the through-hole, and the middle part of piston rod has conical body (62), and the tip of conical body is towards lower piston, and the one end of milling piece is inlayed with slide rail (621) or the spout of conical body surface and is connected, and when the conical body along the axial displacement of barrel, the milling piece is pushed the effect and is followed the radial displacement of barrel by the wedge of conical body. The milling part of the casing section milling device provided by the utility model has stronger stability, and is beneficial to avoiding the risk of blocking of the milling blade.

Description

Casing section milling device

Technical Field

The utility model relates to the technical field of milling tools, in particular to a casing section milling device.

Background

At present, the casing section milling device applied to side drilling often has the problem of poor blade righting stability, and if the cutting has not mentioned the oil reservoir casing of hanging weight, the risk that the milling blade holds back the card easily causes. Therefore, how to provide a casing section milling device with strong stability of milling components becomes a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a casing section milling device, and a milling part of the casing section milling device has high stability, and is beneficial to avoiding the risk of blocking a milling blade.

In order to achieve the purpose, the utility model provides the following technical scheme:

a casing section milling device comprises a cylinder body, an upper piston and a lower piston, wherein the upper piston and the lower piston are arranged in the cylinder body, the upper piston is arranged in a first water cavity, the lower piston is arranged in a second water cavity, the upper piston and the lower piston are connected through a piston rod, a conical body is arranged in the middle of the piston rod, the small end of the conical body faces the lower piston, a through hole extending along the radial direction is formed in the cylinder wall of the cylinder body, a milling block penetrates through the through hole, one end of the milling block is embedded with a sliding rail or a sliding groove on the outer surface of the conical body, when the conical body moves along the axial direction of the cylinder body, the milling block is pushed by a wedge of the conical body to move along the radial direction of the cylinder body, a reversing device is arranged in the cylinder body, and the reversing device is used for changing fluid from the flow direction to the first water cavity into the flow direction to the second water cavity.

Optionally, in the casing milling device, the reversing device includes a ball seat sliding sleeve disposed between the first water cavity and the upper end of the cylinder and a ball seat spring engaged with the ball seat sliding sleeve, and the cylinder is provided with a lower piston water channel extending from the ball seat sliding sleeve to the second water cavity.

Optionally, in the casing section milling device, the cylinder is provided with a positive circulation water channel extending from the first water cavity to a position below the second water cavity, and a joint of the positive circulation water channel and the first water cavity is provided with a pressure valve.

Optionally, in the casing section milling device, an opening communicated with the lower port of the cylinder is formed in the bottom of the second water cavity, and a piston top cap located below the lower piston and used for plugging the opening is arranged in the second water cavity.

Optionally, in the casing section mill, a side of the piston top cap facing the lower piston has a top bar.

Optionally, in the casing section mill described above, the cone is a cone.

Optionally, in the casing section milling machine, the sliding rail or the sliding groove on the outer surface of the conical body is of a dovetail structure.

Optionally, in the casing section milling device, the number of the milling blocks is 2 to 4, and the milling blocks are uniformly distributed around the axis of the cone.

Optionally, in the casing section milling device, the milling block includes a base and a blade, and the blade includes a milling blade located at an outer edge of the milling block and a section milling blade located at a lower surface of the milling block.

Optionally, in the casing section mill, the material of the milling cutter blade and/or the section milling cutter blade is tungsten steel.

According to the technical scheme, the casing section milling device provided by the utility model has the advantages that the upper piston and the lower piston which are connected through the piston rod are arranged in the cylinder, the upper piston is positioned in the first water cavity, the lower piston is positioned in the second water cavity, and the reversing device in the cylinder is used for changing the fluid flowing to the first water cavity into the fluid flowing to the second water cavity, so that the piston rod can move up and down along the axis of the cylinder under the driving of hydraulic pressure. The middle part of the piston rod is provided with a conical body, the small end of the conical body faces the lower piston, and one end of the milling block is embedded with a sliding rail or a sliding groove on the outer surface of the conical body, so that the milling block moves towards the outer side of the cylinder along with the downward movement of the conical body, and conversely, the milling block moves towards the inner side of the cylinder along with the upward movement of the conical body. In summary, when the casing section milling device provided by the utility model works, the milling block moves along the radial direction of the cylinder body, so that the casing can be milled transversely, and the milling block can be retracted inwards, therefore, the stability of the milling part of the casing section milling device is strong, and the risk of blocking of the milling blade is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a casing section mill provided by an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the milling block 7 with the cone 62 in the upper limit of FIG. 1;

fig. 3 is a schematic cross-sectional view of the milling block 7 in fig. 1 with the cone 62 in the lower limit position.

Labeled as:

11. an upper joint; 12. a lower joint;

21. a ball seat sliding sleeve; 22. a ball seat spring; 23. a filter screen;

3. a pressure valve; 41. a first water chamber; 42. a second water chamber;

51. an upper piston; 52. a lower piston;

61. an upper section of the piston rod; 62. a conical body; 621. a slide rail; 63. a lower section of the piston rod;

7. grinding and milling the blocks; 71. grinding and milling a blade; 72. segment milling of a blade;

81. a positive circulation water channel; 82. a lower piston waterway;

91-94 parts of baffle ring; 101. a piston top cap; 102. and a push rod.

Detailed Description

For the purpose of facilitating understanding, the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, the casing section milling device provided by the embodiment of the present invention includes a cylinder, and an upper piston 51 and a lower piston 52 located in the cylinder, wherein a through hole extending in the radial direction is formed in a wall of the cylinder, a milling block 7 penetrates through the through hole, the upper piston 51 is located in the first water cavity 41, the lower piston 52 is located in the second water cavity 42, and the upper piston 51 and the lower piston 52 are connected by a piston rod. The piston rod comprises a piston rod upper section 61, a piston rod lower section 63 and a conical body 62 positioned in the middle, the small end of the conical body 62 faces the lower piston 52, and one end of the milling block 7 is embedded with a slide rail 621 on the outer surface of the conical body 62.

As shown in fig. 2, in the present embodiment, a dovetail groove is formed at one end of the milling block 7, and the dovetail groove is fitted to the slide rail 621, so that when the conical body 62 moves in the axial direction of the cylinder, the milling block 7 moves in the radial direction of the cylinder by the wedge-shaped pushing action of the conical body 62. In another embodiment, a slide groove having a dovetail structure may be provided on the outer surface of the tapered body 62, and a slide block having a dovetail structure to be fitted to the slide groove may be provided at one end of the milling block 7, and the slide rail 621 or the slide groove on the outer surface of the tapered body 62 may have a shape other than a dovetail shape, for example, a T-shape.

The casing section milling device is of a hydraulic structure, the movement of the conical body 62 is driven by hydraulic pressure, and a reversing device is arranged in the cylinder and is used for changing the fluid from flowing to the first water cavity 41 to flowing to the second water cavity 42. In the embodiment shown in fig. 1, the reversing device includes a ball seat sliding sleeve 21 and a ball seat spring 22 cooperating with the ball seat sliding sleeve 21, the ball seat sliding sleeve 21 is located between the first water chamber 41 and the upper end of the cylinder body, and the cylinder body is provided with a lower piston water channel 82 extending from the position of the ball seat sliding sleeve 21 to the second water chamber 42.

Fig. 1 shows an initial state of the casing milling device, in which the conical body 62 is at the upper limit position, the cross section of the milling block 7 is as shown in fig. 2, two ends of the ball seat spring 22 respectively abut against the ball seat sliding sleeve 21 and the stop ring 91, the ball seat sliding sleeve 21 is supported by the ball seat spring 22 at a position capable of blocking the upper port of the lower piston water channel 82, at this time, the liquid flows from the upper joint 11 to the first water cavity 41 and pushes the upper piston 51, so that the piston rod moves downward, the milling block 7 moves toward the outer side of the cylinder along with the downward movement of the conical body 62, and when the conical body 62 reaches the lower limit position, the cross section of the milling block 7 is as shown in fig. 3.

When the milling block 7 is required to be retracted from the state shown in fig. 3 to the state shown in fig. 2, the ball is thrown to displace the ball seat sliding sleeve 21 downward against the elastic force of the ball seat spring 23, so as to open the upper port of the lower piston waterway 82, and at the same time, the passage of the ball seat sliding sleeve 21 is blocked by the ball, so that the fluid flows to the second water chamber 42 through the lower piston waterway 82, and pushes the lower piston 52 to move upward. Since one end of the milling block 7 is embedded in the slide rail 621 on the outer surface of the cone 62, the milling block 7 moves towards the inner side of the cylinder along with the upward movement of the cone 62, and finally retracts to the state shown in fig. 2, and the milling block 7 can be prevented from being stuck by lifting up the tool.

In order to filter the fluid entering the cylinder, the present embodiment is provided with a filter screen 23 at the baffle ring 91. In other embodiments, the reversing device may also take other forms, for example, a reversing valve may be used as the reversing device.

As shown in fig. 1, in this embodiment, the cylinder is provided with a positive circulation water channel 81 extending from the position of the first water cavity 41 to the position below the second water cavity 42, and a pressure valve 3 is disposed at the joint of the positive circulation water channel 81 and the first water cavity 41. When milling or section milling is carried out, the pressure in the first water cavity 41 is larger than the threshold value of the pressure valve 3, so that the positive circulation water channel 81 is communicated, and the liquid can positively circulate and cool the milling block 7 and carry iron cutting.

In order to realize the reset check on the ground, in this embodiment, an opening communicated with the lower port of the cylinder is formed at the bottom of the second water chamber 42, and a piston top cap 101 for blocking the opening is arranged in the second water chamber 42, as shown in fig. 1, the piston top cap 101 is located below the lower piston 52, and after the tool is lifted to the ground, the tool can extend into the thin rod from the inner channel of the lower joint 12, and the piston top cap 101 is pushed by the thin rod to push the lower piston 52 to move upwards. In order to reduce the stroke of the piston top cap 101, the side of the piston top cap 101 facing the lower piston 52 of the present embodiment has a jack 102.

In a specific practical application, the conical body 62 may be a cone or a pyramid, the number of the milling blocks 7 is generally 2 to 4, and in order to balance the stress, the milling blocks 7 need to be uniformly distributed around the axis of the conical body 62. In this embodiment, the milling block 7 includes a base and blades, as shown in fig. 1, the blades include a milling blade 71 located at an outer edge of the milling block 7 and a segment milling blade 72 located at a lower surface of the milling block 7, the milling blade 71 and the segment milling blade 72 may be made of wear-resistant materials such as tungsten steel, and the base may be made of materials with lower cost, so that the overall cost of the milling block 7 may be reduced.

In this embodiment, the baffle rings 91-94 are screwed with the cylinder for limiting the mechanisms.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A casing section milling device is characterized by comprising a cylinder body, an upper piston (51) and a lower piston (52) which are positioned in the cylinder body, wherein the upper piston (51) is positioned in a first water cavity (41), the lower piston (52) is positioned in a second water cavity (42), the upper piston (51) and the lower piston (52) are connected through a piston rod, the middle part of the piston rod is provided with a conical body (62), the small end of the conical body (62) faces the lower piston (52), the cylinder wall of the cylinder body is provided with a through hole extending along the radial direction, a milling block (7) penetrates through the through hole, one end of the milling block (7) is embedded and connected with a sliding rail (621) or a sliding groove on the outer surface of the conical body (62), and when the conical body (62) moves along the axial direction of the cylinder body, the milling block (7) moves along the radial direction of the cylinder body under the wedge-shaped pushing action of the conical body (62), a reversing device is arranged in the cylinder and used for changing the fluid from flowing to the first water cavity (41) to flowing to the second water cavity (42).

2. The casing segment mill of claim 1, wherein the diverter means comprises a ball seat slide sleeve (21) disposed between the first water chamber (41) and an upper end of the barrel, the barrel defining a lower piston gallery (82) extending from the position of the ball seat slide sleeve (21) to the second water chamber (42), and a ball seat spring (22) cooperating with the ball seat slide sleeve (21).

3. The casing section milling device according to claim 1, wherein the cylinder body is provided with a positive circulation water channel (81) extending from the position of the first water cavity (41) to a position below the second water cavity (42), and a pressure valve (3) is arranged at the joint of the positive circulation water channel (81) and the first water cavity (41).

4. The casing section milling machine according to claim 1, characterized in that the bottom of the second water chamber (42) has an opening communicating with the lower port of the cylinder, and a piston top cap (101) for sealing the opening is arranged in the second water chamber (42) and below the lower piston (52).

5. The casing segment mill of claim 4, characterized in that the side of the piston top cap (101) facing the lower piston (52) has a top bar (102).

6. The casing segment mill of any one of claims 1-5 wherein the cone (62) is a cone.

7. The casing segment mill of claim 6, wherein the sliding track (621) or sliding groove of the outer surface of the cone (62) is a dovetail structure.

8. The casing section mill according to claim 6, characterized in that the number of milling blocks (7) is 2-4 and that the milling blocks (7) are evenly distributed around the axis of the cone (62).

9. A casing segment mill according to claim 6, characterized in that the milling block (7) comprises a basic body and blades, the blades comprising milling blades (71) at the outer edge of the milling block (7) and segment milling blades (72) at the lower surface of the milling block (7).

10. The casing segment mill of claim 9, characterized in that the material of the milling insert (71) and/or the segment milling insert (72) is tungsten steel.