Double-layer pipe wall cutting tool

Abstract

The utility model discloses a double-layer pipe wall cutting tool. The double-layer pipe wall cutting tool comprises an upper joint, a cutting device, a centralizing device and a lower joint which are connected in sequence, the upper connector, the cutting device, the centralizing device and the lower connector are each of a hollow structure so as to form a fluid channel penetrating through the double-layer pipe wall cutting tool. A throttling device is arranged in the lower connector and used for throttling fluid flowing through the fluid channel. The pushing mechanism can push the blade in the axial direction and the radial direction, so that the whole blade is opened, one side edge of the opened blade is still clamped in the blade installation groove, and compared with a traditional opening mode that only a pin shaft serves as a fulcrum, the stability of the blade is better when the blade is stressed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field tools, in particular to a double-layer pipe wall cutting tool. Background Art

[0002] With the continued development of oilfields, some wells face retirement and abandonment in later stages. For both economic and ecological reasons, some wells often need to be permanently abandoned or sections of the well must be plugged. According to the technical requirements for plugging abandoned wells, plugging requires cementing plugs in the openhole section, cementing plugs at the cut-off locations, and cementing plugs in the perforated sections of the injection and production zones. In some wells with poor cementing quality or deformed or damaged casing, a forging tool is run to cut and mill away the deformed or severely damaged casing. Cementing plugs or bridge plugs are then placed at appropriate locations within the wellbore for safe plugging. Furthermore, when sidetracking is required, a forging tool is also run to cut and mill away a certain length of casing in the wellbore to create a new channel for the next sidetrack. Currently, when both the production and technical casing layers suffer from poor cementing quality or corrosion during workover operations, simultaneous cutting and forging of both layers is necessary, requiring the cutting tool's blades to extend further out of the tool body. Most existing cutting tool blades open in a swinging motion, as shown in patent application number CN202122633060.5. This technology uses pressure to push down on a sleeve, causing the sleeve to push against the top of the cutting blade, which then opens with a pin as a fulcrum to cut the sleeve. However, in this technology, the cutting blade opens only with its pin as a fulcrum. When cutting the outer sleeve, the cutting blade opens significantly, and relying solely on the pin as a fulcrum reduces the cutting blade's stability. Utility Model Content

[0003] In order to solve the above problems, the present application provides a double-layer pipe wall cutting tool.

[0004] The purpose of the utility model is achieved through the following technical solution: a double-wall pipe cutting tool, comprising an upper joint, a cutting device, a straightening device, and a lower joint connected in sequence; the upper joint, the cutting device, the straightening device, and the lower joint are all hollow structures to form a fluid passage running through the double-wall pipe cutting tool; a throttling device is provided inside the lower joint to throttle the fluid flowing through the fluid passage;

[0005] The cutting device and the straightening device have the same structure, and both include: a mounting sleeve, a pushing mechanism and at least two blades; the blades are movably mounted on the mounting sleeve, the pushing mechanism is arranged in the mounting sleeve and connected to the blades, and the pushing mechanism can push the blades along the axial and radial directions of the mounting sleeve under the action of fluid pressure to open the blades.

[0006] Furthermore, a piston cavity is provided inside the mounting sleeve, and a blade mounting groove communicating with the piston cavity is provided on its side wall, and the blade is movably mounted in the blade mounting groove;

[0007] A piston rod connected to the fluid channel is installed in the piston chamber, and the piston rod is provided with a liquid hole. The fluid channel is connected to the piston chamber through the liquid hole; one end of the pushing mechanism is located in the piston chamber, and it can push the blade to open under the action of the fluid pressure in the piston chamber.

[0008] The pushing mechanism includes a fixed pushing block, a movable pushing block and a piston; the fixed pushing block is fixedly installed in the blade mounting groove and is movably connected to one end of the blade, the piston is slidably installed on the piston rod, and the movable pushing block is installed on the piston and is movably connected to the other end of the blade; the fixed pushing block is provided with a fixed pushing block guide inclined surface, the blade is provided with a first blade guide inclined surface that cooperates with the fixed pushing block guide inclined surface, the movable pushing block is provided with a movable pushing block guide inclined surface, and the blade is provided with a second blade guide inclined surface that cooperates with the movable pushing block guide inclined surface.

[0009] The mounting sleeve is provided with a positioning block, the positioning block is provided with a guide rail, and the blade is provided with a guide groove matched with the guide rail; when the blade moves, the guide rail moves relatively along the guide groove.

[0010] The cutting device and the straightening device are connected via an intermediate joint.

[0011] Compared with the prior art, the present application has the following beneficial effects: the pushing mechanism of the present invention can push the blade in the axial and radial directions, so that the blade is opened as a whole. After the blade is opened, one side of the blade is still engaged in the blade mounting groove. Compared with the traditional opening method that only uses the pin shaft as the fulcrum, the blade of the present invention has better stability when subjected to force.

[0012] Some additional features of the present application may be described in the following description. Some additional features of the present application will be apparent to those skilled in the art from an inspection of the following description and accompanying drawings, or from a thorough understanding of the production or operation of the embodiments. The features disclosed in this application may be realized and achieved through the practice or use of the various methods, means, and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numerals represent the same components.

[0014] Figure 1 This is a structural diagram of the utility model.

[0015] Figure 2 It is a cross-sectional view of the present utility model.

[0016] Figure 3 This is a structural diagram of the blade in the present invention when it cooperates with the pushing mechanism and the blade is retracted.

[0017] Figure 4 This is a structural diagram of the present invention when the blade cooperates with the pushing mechanism and the blade is opened.

[0018] Figure 5 This is a structural diagram of the blade, positioning block and movable push block in the present invention.

[0019] Figure 6 It is a partial cross-sectional view of the present utility model.

[0020] Figure 7 It is a cross-sectional view of the installation sleeve in the present utility model.

[0021] The figure marks in the above drawings are: 1000-upper joint, 2000-cutting device, 2100-mounting sleeve, 2110-piston chamber, 2130-blade mounting groove, 2200-blade, 2210-blade first guide slope, 2220-blade second guide slope, 2230-guide groove, 2300-pushing mechanism, 2310-fixed push block, 2311-fixed push block guide slope, 2320-positioning block, 2321-guide rail, 2330-movable push block, 2331-movable push block guide slope, 2340-piston, 2350-piston rod, 2351-liquid hole, 3000-middle joint, 4000-straightening device, 5000-lower joint, 5100-throttling device, 6000-fluid channel. DETAILED DESCRIPTION

[0022] In order to enable people in this technical field to better understand the solution of this application, the technical solution in the embodiment of this application will be clearly and completely described below in combination with the drawings in the embodiment of this application. Obviously, the described embodiment is only a part of the embodiment of this application, not all of the embodiments.

[0023] Example

[0024] like Figure 1 、 2As shown, this embodiment discloses a double-walled pipe cutting tool comprising five major components, namely, an upper connector 1000, a cutting device 2000, a straightening device 4000, and a lower connector 5000, which are connected in sequence. Each of these five components is hollow, meaning that each of the upper connector 1000, the cutting device 2000, the straightening device 4000, and the lower connector 5000 is provided with a through-hole. When the upper connector 1000, the cutting device 2000, the straightening device 4000, and the lower connector 5000 are connected in sequence, a fluid passage 6000 is formed throughout the entire double-walled pipe cutting tool. During use, the upper connector 1000 is connected to downhole equipment, which lowers the entire double-walled pipe cutting tool into a downhole casing.

[0025] The upper joint 1000, the cutting device 2000, the straightening device 4000 and the lower joint 5000 are connected to each other through threads, and sealing rings are provided at the connection positions to improve the sealing performance.

[0026] like Figure 2 As shown, the lower joint 5000 is internally provided with a throttling device 5100 to throttle the fluid flowing through the fluid channel 6000. During use, the downhole equipment injects drilling fluid into the fluid channel 6000. Due to the throttling effect of the throttling device 5100, the drilling fluid inside the fluid channel 6000 is pressurized. In a specific implementation, the throttling device 5100 can be implemented as a throttle valve.

[0027] like Figure 2 As shown, the cutting device 2000 and the straightening device 4000 have the same structure. The straightening device 4000 is used to position the double-walled pipe cutting tool, while the cutting device 2000 is used to cut the casing. The following describes only the structure of the cutting device 2000. The cutting device 2000 includes: a mounting sleeve 2100, a pushing mechanism 2300, and at least two blades 2200. The blades 2200 are movably mounted on the mounting sleeve 2100. The pushing mechanism 2300 is disposed within the mounting sleeve 2100 and connected to the blades 2200. Under the action of fluid pressure, the pushing mechanism 2300 pushes the blades 2200 axially and radially of the mounting sleeve 2100, causing them to open. The number of blades 2200 can be two, three, or more. In this embodiment, the number of blades 2200 is three, evenly distributed circumferentially around the mounting sleeve 2100.

[0028] like Figure 6 、 7As shown, the mounting sleeve 2100 has a piston chamber 2110 disposed therein, and a blade mounting slot 2130 disposed on its sidewall, which is in communication with the piston chamber 2110. The blade 2200 is movably mounted within the blade mounting slot 2130. One end of the mounting sleeve 2100 of the cutting device 2000 is threadedly connected to the upper connector 1000, while the other end is threadedly connected to the mounting sleeve 2100 of the straightening device 4000. The other end of the mounting sleeve 2100 of the straightening device 4000 is threadedly connected to the lower connector 5000.

[0029] In addition, a piston rod 2350 is installed in the piston chamber 2110 and is connected to the fluid channel 6000. During installation, one end of the piston rod 2350 is connected to the inner hole of the mounting sleeve 2100 of the cutting device 2000, and the other end is connected to the inner hole of the mounting sleeve 2100 of the straightening device 4000, so that the inner hole of the piston rod 2350 becomes part of the fluid channel 6000. The piston rod 2350 is provided with a liquid hole 2351, and the fluid channel 6000 is connected to the piston chamber 2110 through the liquid hole 2351. Figure 6 When the downhole equipment injects drilling fluid into the fluid channel 6000, the fluid pressure in the fluid channel 6000 increases under the throttling effect of the throttling device 5100. As the pressure continues to increase, the drilling fluid flows from the fluid channel 6000 through the liquid hole 2351 into the piston chamber 2110.

[0030] One end of the pushing mechanism 2300 is located in the piston cavity 2110 . When drilling fluid enters the piston cavity 2110 , the fluid pressure in the piston cavity 2110 increases, thereby pushing the blade 2200 to open.

[0031] like Figure 3-5 As shown, the pushing mechanism 2300 includes a fixed pushing block 2310, a movable pushing block 2330 and a piston 2340. The fixed pushing block 2310 is fixedly installed in the blade mounting groove 2130 and is movably connected to one end of the blade 2200. The piston 2340 is slidably installed on the piston rod 2350. The movable pushing block 2330 is installed on the piston 2340 and is movably connected to the other end of the blade 2200. In order to better push the blade 2200 out, a fixed pushing block guide bevel 2311 is provided on the fixed pushing block 2310, and a first blade guide bevel 2210 that cooperates with the fixed pushing block guide bevel 2311 is provided on the blade 2200. Correspondingly, a movable pushing block guide bevel 2331 is provided on the movable pushing block 2330, and a second blade guide bevel 2220 that cooperates with the movable pushing block guide bevel 2331 is provided on the blade 2200. Figure 3 shown.

[0032] Through the above structure, when the fluid pressure in the piston chamber 2110 increases, the pressure pushes the piston 2340, and the piston 2340 drives the movable push block 2330 to move forward. The movable push block 2330 pushes the blade 2200 in the axial direction. Due to the guiding effect of the fixed push block guide bevel 2311 and the movable push block guide bevel 2331, the blade 2200 moves axially and opens radially, so that the blade 2200 as a whole extends out of the blade mounting slot 2130. The downhole equipment drives the entire double-layer pipe wall cutting tool to rotate, and the blade 2200 cuts the inner casing. After the inner casing is cut, as the pressure in the piston chamber 2110 continues to increase, the blade 2200 continues to open to cut the outer casing. Figure 4 After the casing is cut, the downhole equipment stops injecting drilling fluid, and the drilling fluid in the fluid channel 6000 and the piston chamber 2110 slowly flows out through the throttling device 5100. After the pressure is lost, the piston 2340 returns to its original position under the action of its own gravity, and the blade 2200 is retracted into the blade mounting groove 2130. Figure 3 shown.

[0033] In addition, if Figure 5 As shown, a positioning block 2320 is fixedly disposed within the mounting sleeve 2100. The positioning block 2320 is provided with a guide rail 2321, and the blade 2200 is provided with a guide groove 2230 that cooperates with the guide rail 2321. When the blade 2200 moves, the guide rail 2321 moves relative to the guide groove 2230. The design of the positioning block 2320 and the cooperation between the guide rail 2321 and the guide groove 2230 make the blade 2200 more stable during movement. In addition, because the extension direction of the guide groove 2230 cooperates with the movement trajectory of the blade 2200, under the limiting action of the guide rail 2321 and the guide groove 2230, if the movable push block 2330 does not axially push the blade 2200, the blade 2200 will not radially open, preventing the blade 2200 from opening when not in operation.

[0034] As an optional implementation of this embodiment, the cutting device 2000 and the straightening device 4000 are connected via an intermediate joint 3000. At this time, one end of the mounting sleeve 2100 of the cutting device 2000 is connected to the upper joint, and the other end is connected to the outer wall of the intermediate joint 3000, and its piston rod 2350 is connected to the inner hole of the intermediate joint 3000. One end of the mounting sleeve 2100 of the straightening device 4000 is connected to the outer wall of the intermediate joint 3000, and the other end is connected to the lower joint 5000. One end of the piston rod 2350 on the straightening device 4000 is connected to the inner hole of its mounting sleeve 2100, and the other end is connected to the inner hole of the lower joint 5000, as shown in FIG. Figure 2 shown.

[0035] When using the double-walled pipe cutting tool of this embodiment, after the downhole equipment injects drilling fluid into the double-walled pipe cutting tool, the blades on the lower straightening device 4000 first open to position and straighten the double-walled pipe cutting tool. Then, the blades of the cutting device 2000 open to cut the casing. The blades on the straightening device 4000 are straightening blades and do not need to be provided with cutting edges.

[0036] The pushing mechanism of the present invention can push the blade 2200 in the axial and radial directions, so that the blade 2200 is opened as a whole. After the blade 2200 is opened, one side is still engaged in the blade mounting groove. When the tool rotates, the force area between the blade and the tool is larger. Compared with the traditional opening method that only uses the pin shaft as the fulcrum, the present invention has better stability.

[0037] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0038] In addition, the above-mentioned specific embodiments are merely illustrative. Those skilled in the art may devise various solutions based on the disclosure of this utility model, and such solutions fall within the scope of disclosure and the scope of protection of this utility model. Those skilled in the art should understand that the specification and drawings of this utility model are illustrative and do not constitute limitations of the claims. The scope of protection of this utility model is defined by the claims and their equivalents.

Claims

1. A double-wall pipe cutting tool, characterized in that: The invention comprises an upper joint (1000), a cutting device (2000), a straightening device (4000) and a lower joint (5000) which are connected in sequence; the upper joint (1000), the cutting device (2000), the straightening device (4000) and the lower joint (5000) are all hollow structures to form a fluid channel (6000) that passes through the double-walled pipe cutting tool; a throttling device (5100) is provided inside the lower joint (5000) to throttle the fluid flowing through the fluid channel (6000); The cutting device (2000) and the straightening device (4000) have the same structure, and both include: a mounting sleeve (2100), a pushing mechanism (2300) and at least two blades (2200); the blades (2200) are movably mounted on the mounting sleeve (2100), the pushing mechanism (2300) is arranged in the mounting sleeve (2100) and connected to the blades (2200), and the pushing mechanism (2300) can push the blades (2200) along the axial and radial directions of the mounting sleeve (2100) under the action of fluid pressure, so that the blades (2200) are opened.

2. The double-wall pipe cutting tool according to claim 1, characterized in that: The mounting sleeve (2100) is provided with a piston cavity (2110) inside, and a blade mounting groove (2130) communicating with the piston cavity (2110) is provided on its side wall, and the blade (2200) is movably mounted in the blade mounting groove (2130); A piston rod (2350) connected to the fluid channel (6000) is installed in the piston chamber (2110), and the piston rod (2350) is provided with a liquid hole (2351). The fluid channel (6000) is connected to the piston chamber (2110) through the liquid hole (2351); one end of the pushing mechanism (2300) is located in the piston chamber (2110), and it can push the blade (2200) to open under the action of the fluid pressure in the piston chamber (2110).

3. The double-wall pipe cutting tool according to claim 2, characterized in that: The pushing mechanism (2300) includes a fixed pushing block (2310), a movable pushing block (2330) and a piston (2340); the fixed pushing block (2310) is fixedly installed in the blade mounting groove (2130) and is movably connected to one end of the blade (2200); the piston (2340) is slidably installed on the piston rod (2350); the movable pushing block (2330) is installed on the piston (2340) and is movably connected to the other end of the blade (2200). The fixed push block (2310) is provided with a fixed push block guide inclined surface (2311), the blade (2200) is provided with a first blade guide inclined surface (2210) that cooperates with the fixed push block guide inclined surface (2311), the movable push block (2330) is provided with a movable push block guide inclined surface (2331), and the blade (2200) is provided with a second blade guide inclined surface (2220) that cooperates with the movable push block guide inclined surface (2331).

4. The double-wall pipe cutting tool according to claim 3, characterized in that: The mounting sleeve (2100) is provided with a positioning block (2320), the positioning block (2320) is provided with a guide rail (2321), and the blade (2200) is provided with a guide groove (2230) that cooperates with the guide rail (2321); when the blade (2200) moves, the guide rail (2321) moves relatively along the guide groove (2230).

5. The double-wall pipe cutting tool according to any one of claims 1 to 4, characterized in that: The cutting device (2000) and the straightening device (4000) are connected via an intermediate joint (3000).

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