CN217501609U - Large-size casing pipe section milling tool - Google Patents

Abstract

The utility model proposes a large-size casing section milling tool, which comprises a cylindrical body, an outer wall of the body is provided with a plurality of rectangular grooves in the axial direction; a cutter is arranged in the rectangular groove, and the cutter is Under the action of thrust, it is radially expanded or retracted from the rectangular groove into the rectangular groove; the piston is arranged inside the body, and the piston is axially retracted under the action of the fluid; wherein , the piston extends or retracts in the axial direction to drive the cutter to open or retract in the radial direction. When the utility model is segment-milling the outer casing in the double-layer casing, the tool can be run down through the inner casing, and the hydraulically driven cutter is extended to perform the segment milling operation; after the operation is completed, the cutter can be retracted to the tool body Inside, the drilling is carried out to the wellhead through the inner casing.

Description

Large size casing section milling tool

technical field

The utility model relates to a segment milling tool, in particular to a large-size casing segment milling tool, which belongs to the technical field of petroleum.

Background technique

With the prolongation of the exploitation time of offshore oil and gas fields, more and more oil and gas wells are entering non-production state one after another. These non-production wells need to be abandoned immediately to permanently eliminate their potential threats to the environment. Domestic offshore oil and gas exploration and development started relatively late, but the East China Sea and Bohai Bay have entered the stage of permanent marine well abandonment to varying degrees.

The basic requirements for permanent abandonment of wells in the ocean include 4 aspects:

(1) Isolate and protect all freshwater and near freshwater layers; (2) Isolate and protect all future production layers with commercial exploitation value; (3) Prevent fluid leakage and outflow from the well; (4) Remove all facilities above the seabed, Cut the pipes below the mud line.

This requires a certain length of casing to be milled out and cement plugs to be made to block the production layer and prevent oil and gas leakage. In some cases, it is necessary to mill off the entire section of the two layers of casing, and then install the cement plug. Conventional casing section milling technology requires two layers of casing string to be milled layer by layer from the inside out. For example, when segment milling 9-5/8”×13-3/8” two-layer casing, the segment milling tool goes down from the 9-5/8” casing to the target depth, and extends the blade section to mill out a certain length of 9-5/8” casing; Trip out to the wellhead to replace the section milling tool, then go down from the 9-5/8” casing to a predetermined depth, extend the cutter section and mill out a certain length of 13-3/8” casing . The tools for segment milling 9-5/8” casing are relatively mature. However, when segment milling 13-3/8” casing or larger casing, the segment milling tool needs to be able to run through the inner casing. (that is, the outer diameter of the tool is limited by the diameter of the inner casing), and a long enough tool must be extended to mill out the outer casing. Conventional segment milling tools can no longer fully meet the requirements.

Utility model content

Aiming at the above-mentioned technical problems existing in the prior art, the utility model proposes a large-size casing section milling tool, which can pass through the inner casing when the outer casing in the double casing is segment-milled. After the operation is completed, the tool can be retracted into the tool body, and the drilling is carried out to the wellhead through the inner casing.

The utility model proposes a large-size casing section milling tool, comprising:

a cylindrical body, a plurality of rectangular grooves are arranged on the outer wall of the body along the axial direction;

a tool set in the rectangular groove, the tool radially expands or retracts from the rectangular groove into the rectangular groove under the action of thrust;

a piston arranged inside the body, the piston expands and contracts in the axial direction under the action of the fluid;

Wherein, the piston extends or retracts in the axial direction to drive the cutter to open or retract in the radial direction.

A further improvement of the present invention is that the cutter is detachably installed in the rectangular groove, and the cutter includes a window cutter and a milling cutter;

The window cutting tool is installed in the rectangular groove when cutting the outer casing, and the milling tool is installed in the rectangular groove when milling the outer casing.

A further improvement of the present invention is that the cutter comprises a bar-shaped cutter body, the upper end of the cutter body is connected to the body through a drive rod, and the lower end is connected to the body through a support assembly;

Wherein, the drive rod and the support assembly are rotated to expand or retract the tool body in the radial direction.

A further improvement of the utility model is that the outer wall of the cutter body is an arc surface, and cutter teeth are arranged on the outer wall. The cutter teeth of the window cutter are several cutting blocks, and the cutter teeth of the milling cutter are Milled columns.

A further improvement of the present invention is that wear strips are arranged on the outer wall of the cutter body.

A further improvement of the present invention is that the drive rod is a long strip structure with arcuate ends, the upper end of which is connected to the body through a first pin, and the arcuate surface of the upper end is provided with a number of saw teeth, and the lower end passes through the The second pin is connected to the tool body;

Wherein, the side surface of the piston is provided with a plurality of serrations, which are engaged with the serrations of the driving rod, and the serrations drive the driving rod to rotate along the first pin shaft through the serrations when the piston expands and contracts.

A further improvement of the present invention is that the support assembly includes an upper support rod and a lower support rod, and the upper ends of the upper support rod and the lower support rod are both connected to the body through a set of third pin shafts, and the other ends are both connected to the body. The tool body is connected through a set of fourth pins.

A further improvement of the present invention is that an annular chamber is arranged on the inner flow channel of the body;

The piston is a stepped tubular structure, which includes a thicker piston cylinder and a thinner piston tube, the piston cylinder is arranged in the annular chamber, the piston tube extends into the lower flow channel, and the piston tube is on the Set the sawtooth.

A further improvement of the present invention is that a spring is arranged in the annular chamber, and the spring exerts an elastic force between the body and the piston.

A further improvement of the present invention is that the upper end of the main body is provided with an upper joint, and the side surface of the upper joint is provided with a plurality of spray nozzles along the radial direction.

The further improvement of the utility model lies in that the lower end cone surface and the bottom surface of the main body are surfacing hard alloy material.

A further improvement of the present invention is that the end of the piston tube is provided with a throttle.

Compared with the prior art, the advantages of the present utility model are:

The utility model relates to a large-size casing section milling tool, when the outer casing in the double casing is section-milled, the tool can be run down through the inner casing, and the hydraulically driven cutter is extended to perform the segment milling operation; After the operation is completed, the tool can be retracted into the tool body, and the drill can be drilled to the wellhead through the inner casing.

Description of drawings

The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings, in which:

1 is a schematic structural diagram of a large-size casing section milling tool according to an embodiment of the present invention;

Fig. 2 is the left side view of Fig. 1;

Fig. 3 is the sectional view at A-A place in Fig. 1;

Fig. 4 is the sectional view at B-B place in Fig. 1;

Fig. 5 is the sectional view at C-C place in Fig. 2;

Fig. 6 is the sectional view at D-D place in Fig. 2;

Figure 7 is an axonometric view of a window cutter according to an embodiment of the present invention;

Fig. 8 is the axonometric view of the window cutter body in Fig. 7;

9 is an axonometric view of a milling cutter according to an embodiment of the present invention;

Figure 10 is an axonometric view of the milling cutter body in Figure 9;

11 is an axonometric view of a drive rod according to an embodiment of the present invention;

Figure 12 is an axonometric view of an upper support rod and a lower support rod according to an embodiment of the present invention;

13 is a schematic view of the working state of a large-size casing section milling tool according to an embodiment of the present invention, showing the state when the outer casing is cut;

FIG. 14 is a schematic view of the working state of a large-size casing section milling tool according to an embodiment of the present invention, showing the state when milling the outer casing.

In the drawings, the same components are given the same reference numerals. The drawings are not drawn to actual scale.

The meanings of the reference numerals in the accompanying drawings are as follows:

1, the body,

2. Knives,

3. Piston,

11. Rectangular groove,

12. Upper connector,

13. Carbide material,

14. Nozzle,

15. Spring,

16, sealing ring,

21, window cutter,

22. Milling tools,

23. Tool teeth,

24, wear strips,

25. Drive rod,

26. Upper support rod,

27. Lower support rod,

211. The window tool body,

212, cutting block,

213. The first rectangular slot,

214. The second rectangular slot,

221. Grinding tool body,

222. Milling column,

223, the third rectangular slot,

224, the fourth rectangular slot,

251. Sawtooth,

252, the first pin,

253, the second pin,

261, the third pin,

264, the fourth pin,

31. Piston cylinder,

32. Piston tube,

33, throttle,

41. Inner casing,

42. Outer casing,

43. Drill pipe.

Detailed ways

In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. Also, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

FIG. 1 schematically shows a large-sized casing section milling tool including a body 1 according to an embodiment of the present invention. The body 1 is a cylindrical structure with a flow channel inside. A plurality of rectangular grooves 11 are radially provided on the outer wall of the main body 1 . In this embodiment, the rectangular grooves 11 are two groups, which are oppositely arranged on both sides of the main body 1 . A cutter 2 is installed in the rectangular groove 11 for cutting the outer casing 42 or milling the outer casing. The cutter 2 can be retracted or opened, and retracted into the rectangular groove 11 when retracted to facilitate lowering the tool; when extended, it extends radially from the rectangular groove 11 and can be used for cutting or milling sleeves. The large-size casing section milling tool in this embodiment further includes a piston 3 that expands and contracts in the axial direction under the action of the fluid.

When using the large-size casing section milling tool according to this embodiment, the main body 1 is connected to the drill pipe and placed downhole. In the initial state, the tool 2 is in the state of shrinking into the rectangular groove 11. The displacement of the fluid controls the pressure received by the piston 3, thereby controlling the expansion and contraction of the piston 3. When the piston 3 extends, the cutter 2 is opened, so that the cutter 2 cuts or mills the casing.

In one embodiment, the cutter 2 is detachably installed in the rectangular groove 11 , and the cutter 2 includes a window cutter 21 and a milling cutter 22 ; The window cutting tool 21 is installed in the rectangular groove 11 , and the milling tool 22 is installed in the rectangular groove 11 when milling the outer casing.

In the large-size casing section milling tool according to the present embodiment, different functions are achieved by providing different types of cutters 2 . When in use, select the appropriate tool 2 according to actual needs. When cutting the outer casing 42, select the window cutting tool 21 to be installed in the rectangular groove 11; when milling the outer casing, select the milling tool 22 to be installed in the inside the rectangular groove 11 . The casing can be handled in many different ways with one tool.

In one embodiment, the tool 2 comprises a tool body. The cutter body is a block-shaped structure, preferably a rectangular device structure, and the shape matches the shape of the rectangular groove 11 . Wherein, the outer side wall is an arc surface. The upper end of the tool body is connected to the body 1 through the drive rod 25, and the lower end is connected to the body 1 through the support assembly. Wherein, the drive rod 25 and the support assembly can make the cutter body radially expand or retract through rotation.

When the piston 3 is retracted, the driving rod 25 is driven to rotate, and when the driving rod 25 is rotated, the tool body is driven to expand or contract from the rectangular groove 11 .

In one embodiment, the outer wall of the cutter body is an arc surface, and cutter teeth 23 are provided on the outer wall. The cutter teeth 23 are detachable teeth and can be configured into different shapes and structures. The other parts of the different types of tools 2 are similar, and the parts of the tool teeth 23 are different. For example, the tool teeth 23 of the window cutting tool 21 are several cutting blocks 212 , and the tool teeth 23 of the grinding tool 22 are grinding columns 222 .

In a preferred embodiment, a wear-resistant strip 24 is provided on the outer wall of the tool body.

In the large-size casing section milling tool according to the present embodiment, the upper part of the window cutter body 211 is provided with several rows of first rectangular grooves 213 arranged at intervals, and the middle part of the window cutter body 211 is provided with a protrusion for righting . The protrusions are provided with a plurality of second rectangular grooves 214 uniformly distributed along the circumferential direction of the window cutter body 211 . The cutting block 212 is installed in the first rectangular groove 213 , and the wear strip 24 is installed in the second rectangular groove 214 .

The upper portion of the milling cutter body 221 is provided with a plurality of rectangular strips uniformly distributed along the circumferential direction of the milling cutter body 221 , and the middle portion of the milling cutter body 221 is provided with a protrusion for centering. A plurality of third rectangular grooves 223 spaced apart are provided on one side of the rectangular strip, and a plurality of fourth rectangular grooves 224 are uniformly distributed along the circumferential direction of the window cutter body 211 on the protrusion. The milling column 222 is provided in the third rectangular groove 223 , and the wear strip 24 is provided in the fourth rectangular groove 224 .

The cutting block 212 , the milling column 222 and the wear strip 24 are all made of cemented carbide.

In one embodiment, the driving rod 25 is a long strip structure, and the end face with arc-shaped ends is preferably a semicircle. The upper end of the driving rod 25 is connected to the main body 1, and the lower end is connected to the tool body. In this embodiment, the upper end of the driving rod 25 is hinged with the body 1 through the first pin shaft 252 , and the lower end is hinged with the cutter body through the second pin shaft 253 . The length direction of the driving rod 25 is consistent with the axial direction of the main body 1 , and the width direction is consistent with the radial direction of the main body 1 .

A plurality of serrations are arranged on the arc surface of the upper end of the driving rod 25 . The side surface of the piston 3 is provided with a number of serrations, which mesh with the serrations of the driving rod 25 , and the serrations drive the driving rod 25 to rotate along the first pin shaft 252 through the serrations when the piston 3 expands and contracts.

In the large-size casing section milling tool according to this embodiment, the piston 3 drives the drive rod 25 to rotate around the first pin 252 through the sawtooth during the expansion and contraction process. The pin 253 rotates. In this way, the movement of the piston 3 can drive the tool 2 to expand outward or contract inward.

In one embodiment, the support assembly includes an upper support rod 26 and a lower support rod 27, the upper support rods 26 are arranged in pairs on one side near the middle of the tool body, and the lower support rods 27 are arranged in pairs near the tool body side of the lower end. In this embodiment, two elongated grooves are respectively provided on both sides of the lower part of the cutter body for accommodating the upper support rod 26 and the lower support rod 27 .

The upper end of the upper support rod 26 is hinged with the body 1 through a third pin 261, and the lower end is hinged with the cutter body through a fourth pin 264; the upper end of the lower support rod 27 is also hinged with the body 1 through a third pin 261. , the lower end is hinged with the cutter body through the fourth pin shaft 264 .

Preferably, both ends of the upper support rod 26 and the lower support rod 27 are semicircular bodies, the middle parts are rectangular parallelepipeds, and stepped through holes are provided along the axis direction of the semicircular bodies.

In one embodiment, an annular chamber is provided on the inner flow channel of the main body 1, the inner diameter of the annular chamber is larger, and the inner diameter of the lower flow channel is smaller, forming a stepped hole. An annular end face is formed between the annular cavity and the lower flow channel. The piston 3 is a stepped tubular structure, which includes a thicker piston cylinder 31 and a thinner piston tube 32, the piston cylinder 31 is arranged in the annular chamber, the piston tube 32 extends into the lower flow channel, and the The serrations are provided on the outer wall of the piston tube 32 . The end of the piston tube 32 is provided with a throttling nozzle 33, which plays the role of throttling and makes the upper part generate pressure.

In this embodiment, a stepped hole is also formed inside the piston 3, thus forming an upper and lower pressure difference surface, and at the same time, the throttling effect of the throttling nozzle 33 makes the pressure of the fluid push the piston 3 to move, and the fluid flows through the interior At the time, by controlling the displacement and pressure of the fluid, the force that pushes the piston 3 to move can be controlled, so as to control the expansion and contraction of the piston 3, and further control the opening or contraction of the tool 2.

In a preferred embodiment, a spring 15 is arranged in the annular chamber, and the spring 15 exerts an elastic force between the body 1 and the piston 3 . The lower end of the spring 15 is arranged between the annular cavity and the lower flow channel to form an annular end face, and the upper end is arranged on the annular boss on the upper end of the piston 3 to exert an upward elastic force for the piston 3. When the pressure caused by the displacement of the fluid is greater than When the elastic force of the spring 15 is used, the piston 3 moves downward. When the pressure is less than the elastic force of the spring 15, the spring 15 pushes the piston 3 to move upward.

In a preferred embodiment, the upper end of the main body 1 is provided with an upper joint 12, and the side surface of the upper joint 12 is provided with a plurality of spray nozzles 14 in the radial direction.

In one embodiment, the lower conical surface and the bottom surface of the body 1 are surfacing with a cemented carbide material 13 .

While the preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Accordingly, the appended claims are intended to be construed to include the preferred embodiment and all changes and/or modifications that fall within the scope of the present invention, and changes and/or modifications made in accordance with the embodiments of the present invention shall be covered within the scope of the present invention. within the scope of protection.

Claims (11)

1. A large size casing segment milling tool, comprising:

the device comprises a cylindrical body (1), wherein a plurality of rectangular grooves (11) are formed in the outer wall of the body (1) along the axial direction;

the cutter (2) is arranged in the rectangular groove (11), and the cutter (2) is expanded or retracted into the rectangular groove (11) from the rectangular groove (11) in the radial direction under the action of thrust;

the piston (3) is arranged in the body (1), and the piston (3) stretches and retracts along the axial direction under the action of fluid;

the piston (3) stretches and retracts along the axial direction to drive the cutter (2) to expand or retract along the radial direction;

the tool (2) is detachably mounted in the rectangular groove (11), and the tool (2) comprises a windowing tool (21) and a milling tool (22);

when the outer sleeve (42) is cut, the windowing cutter (21) is arranged in the rectangular groove (11), and when the outer sleeve is ground and milled, the grinding and milling cutter (22) is arranged in the rectangular groove (11).

2. The large-size casing segment milling tool according to claim 1, characterized in that the cutter (2) comprises a bar-shaped cutter body, the upper end of which is connected to the body (1) through a drive rod (25), and the lower end of which is connected to the body (1) through a support assembly;

wherein the drive rod (25) and the support assembly radially expand or retract the cutter body by rotation.

3. The large casing section milling tool according to claim 2, wherein the outer wall of the tool body is an arc-shaped surface, the tool teeth (23) are arranged on the outer wall of the tool body, the tool teeth (23) of the windowing tool (21) are a plurality of cutting blocks (212), and the tool teeth (23) of the milling tool (22) are milling columns (222).

4. The large casing segment milling tool according to claim 3, characterized in that the outer wall of the tool body is provided with wear strips (24).

5. The milling tool for the section of the large-size sleeve pipe according to claim 4, wherein the driving rod (25) is a long-bar structure with two arc-shaped ends, the upper end of the driving rod is connected with the cutter body (1) through a first pin shaft (252), a plurality of saw teeth are arranged on the arc-shaped surface of the upper end of the driving rod, and the lower end of the driving rod is connected with the cutter body through a second pin shaft (253);

the side face of the piston (3) is provided with a plurality of sawteeth which are meshed with the sawteeth of the driving rod (25), and the driving rod (25) is driven to rotate along the first pin shaft (252) through the sawteeth when the piston (3) stretches.

6. The large casing section milling tool according to claim 5, characterized in that the support assembly comprises an upper support bar (26) and a lower support bar (27), the upper ends of the upper support bar (26) and the lower support bar (27) are connected to the body (1) by a set of third pins (261), and the other ends are connected to the cutter body by a set of fourth pins (264).

7. The large casing segment milling tool according to claim 6, characterized in that an annular chamber is provided on the flow channel inside the body (1);

piston (3) are the tubular structure of notch cuttype, and it includes thick piston cylinder (31) and thinner piston tube (32), and piston cylinder (31) set up in cyclic annular chamber, in piston tube (32) extend to the runner of lower part, and set up on piston tube (32) the sawtooth.

8. The large casing segment milling tool according to claim 7, characterized in that the end of the piston tube (32) is provided with a choke (33).

9. The large casing segment milling tool according to claim 7, characterized in that a spring (15) is arranged in the annular chamber, the spring (15) exerting a spring force between the body (1) and the piston (3).

10. The large casing segment milling tool according to claim 8, characterized in that the upper end of the body (1) is provided with an upper joint (12), and the side of the upper joint (12) is provided with a plurality of spray nozzles (14) in the radial direction.

11. The milling tool for large-size casing sections according to claim 9, characterized in that the bottom conical surface and the bottom surface of the body (1) are coated with hard alloy material (13).

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