Sleeve cutting tool

Abstract

The utility model relates to a sleeve cutting tool, and belongs to the technical field of sleeve cutting tools. Comprising a driving mechanism used for controlling a cutting mechanism to move, a righting mechanism used for controlling the cutting mechanism and a casing pipe to keep the same gap, and the cutting mechanism used for cutting the casing pipe. The utility model aims to improve the cutting efficiency on the premise of ensuring the safety and the stability in the sleeve cutting process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a casing cutting tool belongs to casing cutting tool technical field. BACKGROUND

[0002] In the well sealing operation of abandoned well, cement return height does not reach the outer layer surface casing shoe and above position when cementing the oil layer casing or technical casing, in order to eliminate the risk of oil and gas leakage on the ground caused by insufficient cement return depth, it is often necessary to reverse or cut out part of the oil layer or technical casing during the well sealing operation of such well, and then cement plug is injected to seal the wellhead and the following well section. In order to improve the casing taking efficiency, cutting method is generally used, and the commonly used cutting tool is hydraulic cutter and mechanical cutter. The hydraulic cutter has high cutting efficiency, but the hydraulic cutter cannot be completely centered, and there is a risk of cutting the outer pipeline. The outer diameter size of the mechanical cutter is much smaller than the inner diameter of the casing to be cut. When the mechanical cutter cuts the casing, the cutter will shake in the casing, which will cause the blade to break due to impact, and will adversely affect the cutting process, resulting in reduced cutting efficiency and increased time cost and cutter cost of cutting operation. In the prior art, the practical new patent application number in China is 202022216355.8, which discloses a casing cutter for righting, the external component includes a righting joint, a main body and a righting guide shoe, the righting joint is screw mounted on the inner side of one end of the main body, the righting guide shoe is screw mounted on the outer side of the other end of the main body, the piston assembly includes a piston body, a spring, a water nozzle and a lower nozzle, the spring is sleeved on the outer side of the piston body, one end of the spring abuts against the other end side of the piston body, the other end abuts against the inner wall of the main body, the water nozzle is installed in the middle of one end of the piston body, and the lower nozzle is installed in the middle of the other end of the piston body. The cutting assembly includes a cutter and a pin shaft, the pin shaft is installed on the inner side of the end of the lower nozzle, and the cutter is rotationally installed on the outer side of the pin shaft. According to the different inner diameters of the casing, the righting joint and the righting guide shoe are used, the outer diameter of which is small compared with the inner diameter of the casing, so that the cutter can rotate stably in the casing, reducing the shaking and damage of the cutter. Although this scheme solves the problem that the cutter shakes in the casing, the cutting efficiency is low. Therefore, it is urgent to develop a hydraulic internal cutter for casing cutting, which has a positive effect on improving the speed and efficiency of well sealing in abandoned well. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a casing cutting tool, which aims to improve the cutting efficiency while ensuring the safety and stability during the cutting process.

[0004] The utility model discloses a casing cutting tool, which aims to improve the cutting efficiency while ensuring the safety and stability during the cutting process.

[0005] The driving mechanism is used for controlling the movement of the cutting mechanism.

[0006] The righting mechanism is used for controlling the cutting mechanism to keep the same gap with the casing pipe.

[0007] The cutting mechanism is used for cutting the casing pipe.

[0008] Further, the driving mechanism comprises a cylinder plug, a piston and a first spring, the piston and the first spring are located in the cylinder plug, and the first spring is sleeved on the piston.

[0009] Further, the cutting mechanism comprises a shell, a cutter, a gland, and a second spring, the shell is detachably connected with the cylinder plug, the shell is provided with an axial through hole and a radial through hole, the radial through hole is provided with a recess close to one side of the outer surface of the shell, the gland is installed in the recess, the cutter is provided with a cutter hole in the middle part of the gland, and the second spring is fixed on the cutter and the gland at two ends.

[0010] Further, the cutter comprises a cutter head and a cutter handle, the cutter handle is provided with a pin hole in the side surface, and the cutter head and the cutter handle are fixed through an internal screw.

[0011] Further, the gland is fastened in the recess through a fastening screw.

[0012] Further, the righting mechanism comprises a righting device body, a righting spring, a righting block and a pressing plate, the righting block is sleeved on the outside of the righting device body, the righting spring is located between the righting block and the righting device body, and the pressing plate is sleeved on the outside of the righting block and is fixed through a fastening screw.

[0013] Further, the righting device body is sleeved on the outer periphery of the cylinder plug, and a gap exists between the righting device body and the shell.

[0014] Further, the inside of the cylinder plug is communicated with the axial through hole of the shell, one end of the piston is conical, and the side surface of one end of the cutter handle is a guide surface; when the piston moves downward, the conical part extrudes the guide surface of the cutter handle, drives the cutter handle to move to the direction close to the gland, and until the cutter head extends from the cutter hole.

[0015] Further, the conical tip of the conical part is further provided with a segmentation tip, and the guide surface of the cutter handle is located on the side surface of the segmentation tip.

[0016] Further, the other end of the segmentation tip extends from the axial through hole.

[0017] The casing pipe cutting tool has the following beneficial effects: the righting mechanism is designed to ensure that the cutting tool can work safely and stably in the casing pipe; the cutting mechanism and the driving mechanism are designed to ensure that the cutting tool can simultaneously extend the cutter, the cutting head is uniformly stressed, is not easy to be damaged, the safety and stability of the cutting process are ensured, and the cutting efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic cross-sectional view of the structure of this utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the cutting mechanism;

[0021] Figure 3 This is a top view schematic diagram of the pressure cap structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the cutting blade structure of this utility model.

[0023] In the diagram: 1. Upper connector; 2. Cylinder plug; 3. O-ring seal; 4. Piston; 5. Fastening screw; 6. Pressure plate; 7. Centralizing block; 8. Centralizing spring; 9. First spring; 10. Housing; 11. Pressure cap; 12. Cutting head; 13. Cutting handle; 14. Second spring; 15. Internal screw; 16. Centralizer body; 17. Axial through hole; 18. Radial through hole; 19. Cutting hole; 20. Guide surface; 41. Cone; 42. Dividing tip. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] To further understand the invention of this utility model, the following detailed description of the specific embodiments is provided.

[0026] Example 1: As Figures 1-4 As shown, this embodiment provides a sleeve cutting tool, including:

[0027] A driving mechanism is arranged to control the movement of the cutting mechanism, which comprises a cylinder plug 2, a piston 4, and a first spring 9. One end of the cylinder plug 2 is threadedly connected to the upper joint 1, and the other end of the cylinder plug 2 is threadedly connected to the housing 10. The piston 4 and the first spring 9 are arranged in the cylinder plug 2. An O-ring 3 is arranged between the piston 4 and the cylinder plug 2. The first spring 9 is sleeved on the piston 4. One end of the first spring 9 abuts against the piston 4, and the other end of the first spring 9 abuts against the housing 10.

[0028] A righting mechanism is arranged to control the cutting mechanism to maintain the same gap with the casing. The righting mechanism comprises a righting body 16, a righting spring 8, a righting block 7, and a pressing plate 6. The righting block 7 is sleeved on the outside of the righting body 16. The righting spring 8 is arranged between the righting block 7 and the righting body 16. The pressing plate 6 is sleeved on the outside of the righting block 7 and is fixed by the fastening screw 5. The righting body 16 is sleeved on the outer periphery of the cylinder plug 2. One end of the righting body 16 abuts against the upper joint 1. There is a gap between the other end of the righting body 16 and the housing 10, which facilitates the rotation of the righting body 16.

[0029] A cutting mechanism is arranged to cut the casing. The cutting mechanism comprises the housing 10, a cutter, a pressing cover 11, and a second spring 14. The housing 10 is sleeved on the outer periphery of the cylinder plug 2. The housing 10 is provided with an axial through hole 17 and a radial through hole 18. The axial through hole 17 and the radial through hole 18 are in communication with each other. The radial through hole 18 is provided with a recess on the side close to the outer surface of the housing 10. The pressing cover 11 is arranged in the recess. Specifically, the pressing cover 11 is fastened in the recess by the fastening screw 5. The cutter comprises a cutter head 12 and a cutter handle 13. The cross section of the cutter handle 13 is larger than that of the cutter head 12. The cutter handle 13 can move along the radial through hole 18 under the action of force. The cutter handle 13 is provided with a pin hole. The inner screw 15 passes through the pin hole to fix the cutter head 12 and the cutter handle 13. The cross section of the cutter head 12 is rectangular. The cutter head 12 is a high-speed steel blade. The pressing cover 11 is provided with a cutter hole 19 in the middle for the cutter to extend out. The cross section of the cutter hole 19 is matched with that of the cutter head 12. The two ends of the second spring 14 are fixed on the cutter and the pressing cover 11, respectively.

[0030] The inside of the cylinder plug 2 is in communication with the axial through hole 17 of the housing 10. The width of the inside of the cylinder plug 2 is greater than that of the axial through hole 17. One end of the piston 4 is conical 41. The other end of the piston 4 is stepped. The piston 4 at the end of the conical 41 extends into the axial through hole 17. One end of the cutter handle 13 is provided with a guide surface 20. The two guide surfaces 20 of the cutter handles 13 are oppositely arranged. The inclination angle of the conical 41 is matched with that of the guide surface 20. The cooperation of the conical 41 and the guide surface 20 can ensure the synchronization of the two sides of the cutter. In this embodiment, the inclination angle of the guide surface 20 is 79°. When the piston 4 is subjected to pressure and moves downward, the conical 41 presses the guide surface 20 of the cutter handle 13, which drives the cutter handle 13 to move in the direction close to the pressing cover 11 until the cutter head 12 extends out of the cutter hole 19.

[0031] In this embodiment, radial cutting of the φ244.5mm casing is required. First, the upper connector 1 is connected via a φ73mm tubing, and the cutting mechanism is lowered to the designed casing cutting position. Clean water is pumped into the tubing using a manual pressure pump to pressurize it. Under the action of water pressure, the piston 4 is pushed downward. At this time, the first spring 9 is compressed. The lower end of the piston 4 has a conical structure 41. The conical structure 41 squeezes the guide surface 20 of the cutter handle 13, causing the cutter handle 13 to move towards the pressure cap 11 until the cutter head 12 extends out from the cutter hole 19. At this time, the second spring 14 is compressed, and the cutter head 12 contacts the inner wall of the casing to be cut. During cutting, under the action of the wellhead hydraulic drive device, the drive string drives the cutter to cut. Due to the design of the straightening mechanism, the cutting mechanism will not shake inside the casing, which can effectively ensure that the cutter head 12 is subjected to uniform force during cutting and prevent damage to the cutter head 12. As the pressure of the manual pressure pump slowly increases, the cutting depth of the cutter head 12 gradually increases until the cutting is completed. After cutting, the pressure inside the pipe is released, and piston 4 returns to its starting position under the action of the first spring 9. The cutter retracts into the housing 10 under the action of the second spring 14. This utility model has a simple structure, is easy to operate, and has good reliability. It can be widely used in φ244.5mm sleeve cutting operations. Taking a sleeve with a wall thickness of 11.05mm as an example, the cutting time is less than 1 hour. After cutting, the cutter retracts flexibly, and there is little risk of jamming.

[0032] Example 2:

[0033] like Figures 1-4 As shown, based on Embodiment 1, a dividing tip 42 extends from the tip of the cone 41. The guide surface 20 of the tool holder 13 is located on the side of the dividing tip 42. The other end of the dividing tip 42 extends from the axial through hole 17. Specifically, the other end of the dividing tip 42 extends from... Figure 1 The axial through hole 17 on the right side extends out, and the tool holder 13 is always on both sides of the dividing tip 42, so that the piston 4 moves downward to squeeze the tool holders 13 on both sides toward the pressure cap 11 in a more continuous and smooth manner.

[0034] The cutting mechanism is connected with the upper joint 1 through a φ73mm drill rod, the drill rod is connected with a wellhead hydraulic drive device, and the cutting mechanism is lowered to a designed casing cutting position, clean water is pumped into the drill rod through a manual pressure pump to pressurize, the piston 4 is pushed downward under the action of water pressure, at this time the first spring 9 is compressed, the lower end of the piston 4 is a conical structure 41, the conical structure 41 extrudes the guide surface 20 of the cutter shank 13, drives the cutter shank 13 to move to the direction close to the grommet 11, until the cutter head 12 extends out of the cutter hole 19, at this time the second spring 14 is compressed, the cutter head 12 contacts the inner wall of the casing to be cut. When cutting, the drill rod drives the cutter to cut under the action of the wellhead hydraulic drive device, since the centralizing mechanism is designed, the cutting mechanism will not sway in the casing, which can effectively ensure that the cutter head 12 is uniformly stressed during cutting, and prevent the cutter head 12 from being damaged; as the pressure of the manual pressure pump slowly increases, the depth of the cutter head 12 gradually increases, after the cutter head 12 cuts through the casing, the wellhead hydraulic drive device drives the drill rod and the utility model to rotate until the cutting is completed. After cutting is completed, the pressure in the pipe is released, the piston 4 is raised to the starting position under the action of the first spring 9, and the cutter is retracted into the housing 10 under the action of the second spring 14.

[0035] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A casing cutting tool characterized by, The device comprises a driving mechanism, a righting mechanism and a cutting mechanism, the driving mechanism controls the movement of the cutting mechanism, the righting mechanism controls the cutting mechanism to keep the same gap with the casing, and the cutting mechanism cuts the casing. The driving mechanism comprises a cylinder plug (2), a piston (4) and a first spring (9), the piston (4) and the first spring (9) are located in the cylinder plug (2), and the first spring (9) is sleeved on the piston (4); the cutting mechanism comprises a shell (10), a cutter, a gland (11) and a second spring (14), the shell (10) is detachably connected with the cylinder plug (2), the shell (10) is provided with an axial through hole (17) and a radial through hole (18), the radial through hole (18) is provided with a recess close to one side of the outer surface of the shell (10), the gland (11) is installed in the recess, the middle part of the gland (11) is provided with a cutter hole (19) for the cutter to extend out, and the two ends of the second spring (14) are fixed on the cutter and the gland (11) respectively.

2. A casing cutting tool as defined in claim 1, wherein The cutter comprises a cutter head (12) and a cutter handle (13), the side surface of the cutter handle (13) is provided with a pin hole, and the cutter head (12) and the cutter handle (13) are fixed through an internal screw (15).

3. A casing cutting tool as defined in claim 1, wherein, The gland (11) is fastened in the recess through a fastening screw (5).

4. A casing cutting tool as defined in claim 1, wherein, The righting mechanism comprises a righting device body (16), a righting spring (8), a righting block (7) and a pressing plate (6); the righting block (7) is sleeved outside the righting device body (16), the righting spring (8) is located between the righting block (7) and the righting device body (16), and the pressing plate (6) is sleeved outside the righting block (7) and is fixed through the fastening screw (5).

5. A casing cutting tool as defined in claim 4, wherein, The righting device body (16) is sleeved outside the periphery of the cylinder plug (2), and there is a gap between the righting device body (16) and the shell (10).

6. A casing cutting tool as defined in claim 4, wherein, The inside of the cylinder plug (2) is in communication with the axial through hole (17) of the shell (10), one end of the piston (4) is conical (41), one end of the side surface of the cutter handle (13) is a guide surface (20), when the piston (4) goes down, the conical (41) extrudes the guide surface (20) of the cutter handle (13), drives the cutter handle (13) to move towards the direction close to the position of the gland (11), and until the cutter head (12) extends out from the cutter hole (19).

7. A casing cutting tool according to any one of claims 1 to 6, wherein The conical tip of the conical (41) further extends a segmentation tip (42), and the guide surface (20) of the cutter handle (13) is located on the side surface of the segmentation tip (42).

8. A casing cutting tool as defined in claim 7, wherein, The other end of the segmentation tip (42) extends out from the axial through hole (17).

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