Novel hydraulic internal cutting knife
By designing a new hydraulic internal cutting knife, using the replacement method of cutting barrel and cutting knife, and combining with the removable connection of the straightening parts, the problem that traditional hydraulic cutting knife cannot adapt to different pipe diameters is solved, and efficient and stable multi-stage pipe cutting is achieved.
Patent Information
- Application Number
- CN202422027592.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-08-20
AI Technical Summary
Traditional hydraulic cutting knives cannot flexibly adapt to different pipe diameters, and the knife body is easy to bend and deform, reducing cutting efficiency and success rate.
A new hydraulic internal cutting knife is designed, including connecting components, cutting components and positioning components. By changing the cutting barrel and cutting knife, combined with the removable connection of the straightening parts, the cutting of pipes of different diameters is achieved.
The effect of cutting multi-stage pipes with one diameter is achieved, which improves cutting efficiency and success rate, and flexibly adapts to different pipe diameters.
Smart Images
Figure CN222848159U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of hydraulic cutter technology, and in particular to a novel hydraulic inner cutter. Background Art
[0002] During the core drilling process, drilling accidents such as stuck drill, buried drill, burned drill, and broken drill often occur. When dealing with complex and special well failures, traditional accident handling methods can no longer meet the requirements of well failure handling, and cutting methods are often required to deal with them, thereby improving the success rate of accident handling, reducing safety risks, and improving economic benefits.
[0003] Drill pipe and casing cutting is an important technical means for handling drilling accidents. The key link in handling some extremely difficult and complex drilling accidents is cutting drill pipe and casing. The hydraulic internal cutting knives used in the past can generally only cut pipes of one caliber, and their disadvantage is that they cannot complete the cutting of pipes of different calibers; or a long knife body is used to achieve the cutting of multi-layer pipes, and their disadvantage is that the knife body is easy to bend and deform after being stressed, and the cutting efficiency and success rate are low, which is not conducive to the subsequent handling of drilling accidents.
[0004] Regarding the above-mentioned related technologies, traditional hydraulic cutters have limited functions and can often only cut pipes of a single caliber, or although they can cut multi-layer pipes, the cutter body is easy to bend and deform, reducing the cutting efficiency and success rate. Therefore, it has become an urgent need in the industry to develop a hydraulic cutter that can flexibly adapt to different pipe calibers and is efficient and stable. Utility Model Content
[0005] In order to improve the problem of not being able to flexibly adapt to different pipe diameters, the present application provides a new type of hydraulic internal cutting knife.
[0006] The present application provides a novel hydraulic inner cutter adopts the following technical solution:
[0007] A novel hydraulic internal cutter comprises a connecting assembly, a cutting assembly and a positioning assembly, wherein the connecting assembly comprises a connecting tube and a plunger, wherein the connecting tube is hollow, one end of the connecting tube is connected to a drill rod, and the plunger is slidably arranged in the connecting tube, and the plunger reciprocates along the axial direction of the connecting tube;
[0008] The cutting assembly comprises a cutting cylinder and a plurality of cutting knives, wherein the cutting cylinder is detachably connected to an end of the connecting cylinder away from the drill pipe, the cutting cylinder is hollow, the cutting cylinder is coaxially arranged with the connecting cylinder, a plurality of cutting openings are evenly opened on the side wall of the cutting cylinder along its circumference, the cutting knives correspond to the cutting openings one by one, the cutting knives are located in the cutting openings, the cutting knives are elastically rotatably connected to the cutting cylinder, the cutting knives rotate toward or away from the cutting cylinder, the cutting knives are used to cut the pipe, and the plunger drives the cutting knives to rotate;
[0009] The positioning assembly includes a positioning tube and a straightening piece. The positioning tube is detachably connected to the side of the cutting tube away from the connecting tube. The positioning tube is coaxially arranged with the cutting tube. The straightening piece is detachably connected to the positioning tube. The straightening piece is used to abut against the inner wall of the pipe.
[0010] By adopting the above technical solution, when it is necessary to cut the pipe, first, according to the diameter of the pipe to be cut, a suitable cutting assembly and a straightening piece are selected, and the selected cutting cylinder and the connecting cylinder are connected, and the straightening piece is connected to the positioning cylinder, and the positioning cylinder and the cutting cylinder are connected. Then, the connecting cylinder is connected to the drill rod, and the new hydraulic internal cutting knife is lowered to the specified position of the pipe through the drill rod. At this time, the straightening piece abuts against the inner wall of the pipe, pushing the plunger to slide along the axis of the connecting tube, and the plunger can push the cutting knife to rotate toward the side away from the cutting tube. When the cutting knife is opened to a certain angle, the drill rod drives the new hydraulic internal cutting knife to rotate. In this process, the cutting knife cuts the pipe. After the cutting is completed, the plunger is started to move along the axis of the connecting tube toward the side away from the cutting knife, and the cutting knife is reset. Then start drilling; when it is necessary to cut other pipes of different diameters, separate the original cutting cylinder from the connecting cylinder and the positioning cylinder on the new hydraulic internal cutting knife, and then separate the straightening piece from the positioning cylinder. According to the diameter of the pipe, select the appropriate cutting cylinder and straightening piece, connect the connecting cylinder and the cutting cylinder, connect the straightening piece to the positioning cylinder, connect the positioning cylinder and the cutting cylinder, and then cut the pipe according to the above steps. Multiple cutting knives are evenly distributed, which is beneficial to ensure stability and uniformity during the cutting process. Compared with the related art, the present application changes the cutting diameter of the new hydraulic internal cutting knife by replacing the cutting cylinder to replace the cutting knife, and then replaces the straightening piece, so as to achieve the effect of using a hydraulic cutting knife of one caliber to cut multi-stage pipes, which is beneficial to improve the problem of not being able to flexibly adapt to different pipe diameters.
[0011] Optionally, the straightening member includes a straightening joint and a plurality of straightening blocks. The straightening joint is integrally arranged at one end of the positioning tube away from the cutting tube. The straightening joint is evenly provided with a plurality of mounting grooves along its circumference. The straightening blocks correspond one-to-one to the mounting grooves. The straightening blocks are located in the mounting grooves. The straightening blocks are detachably connected to the straightening joint, and the straightening blocks abut against the inner wall of the pipe.
[0012] By adopting the above technical solution, when it is necessary to cut pipes of different diameters, a suitable straightening block is selected according to the diameter of the pipe, and the straightening block is fixed to the straightening joint before proceeding to the next step. By setting the straightening block and the straightening joint to be detachably connected, it is easy to add or remove the straightening block, which is beneficial for replacing the straightening block and is convenient for personnel to perform replacement operations.
[0013] Optionally, the plunger is divided into a first tube and a second tube, the first tube and the second tube are integrally arranged, the first tube and the second tube are coaxially arranged, the first tube and the second tube are distributed along the axis direction of the connecting tube toward a side away from the drill rod, the inner diameter of the first tube is larger than the inner diameter of the second tube, the outer wall of the first tube is in contact with the inner wall of the connecting tube, and the second tube can push the cutting knife to rotate;
[0014] The novel hydraulic inner cutter also includes a pushing assembly, which includes a pushing member, and the pushing member is a pushing ball. The pushing ball is located in the first tube, and the side wall of the pushing ball contacts the first tube. The pushing ball can close one end of the second tube.
[0015] By adopting the above technical scheme, when it is necessary to cut the pipe, the selected cutting tube and connecting tube are connected according to the diameter of the pipe, the straightening piece is connected to the positioning tube, the positioning tube and the cutting tube are connected, and the new hydraulic internal cutting knife is lowered to the specified position of the pipe through the drill pipe. Subsequently, the mud pump is turned on to introduce drilling fluid, and the drilling fluid flows through the connecting tube through the drill pipe. The liquid pressure generated by the mud pump and the drilling fluid is placed on the pushing ball, and the pushing ball pushes the plunger to move, and the plunger pushes the cutting knife to rotate. When the cutting knife rotates to the appropriate position, the drill pipe drives the new hydraulic internal cutting knife to rotate. In this process, the cutting knife cuts the pipe. By setting the pushing component, on the one hand, it is convenient to push the plunger to move; on the other hand, the pushing ball is located in the first tube, and the side wall of the pushing ball contacts the first tube. The pushing ball can close one end of the second tube, so that when the pushing ball pushes the plunger, the pressure can be kept stable, so as to push the plunger to move more smoothly.
[0016] Optionally, the positioning assembly also includes a water passing part, which includes a water passing pipe and a limit screw. The water passing pipe is coaxially arranged with the positioning cylinder, and is sequentially passed through the second cylinder, the cutting cylinder and the positioning cylinder. A limit hole is provided on the side wall of the positioning cylinder. The limit screw passes through the limit hole and is tightened against the water passing pipe. The limit screw is threadedly connected to the positioning cylinder. The water passing pipe plays the role of passing water and stopping the plunger stroke.
[0017] By adopting the above technical solution, the plunger pushes the cutting knife to rotate to the appropriate position, and the drill pipe drives the new hydraulic internal cutting knife to rotate. During this process, the cutting knife cuts the pipe. When the cutting is completed, due to the limited position of the water pipe, the water pipe will push the ball top open, causing pressure relief. The operator on the well can judge whether the cutting is completed by the change of mud pump pressure. According to the cutting requirements, the limit screw is screwed to adjust the height of the water pipe to adjust the plunger stroke and the opening angle of the cutting knife and other parameters. By setting the cooperation of the water pipe and the limit screw, it is easy to control the plunger stroke and the opening angle of the cutting knife and other parameters to facilitate pipe cutting.
[0018] Optionally, the pushing assembly also includes an elastic member, which includes a connecting ring and a spring. The connecting ring is coaxially fixed in the connecting tube, the connecting ring is located at one end of the connecting tube close to the cutting tube, the second tube extends into the connecting ring, the second tube is slidably arranged on the connecting ring, the spring is sleeved on the outer wall of the second tube, one end of the spring is fixed to the first tube, and the other end is fixed to the connecting ring.
[0019] By adopting the above technical solution, the pushing ball pushes the plunger to move toward the side away from the drill pipe, the spring is compressed, and the spring has elastic potential energy. When the cutting is completed, the mud pump is turned off, the plunger is reset under the action of the spring, the cutting knife is retracted into the cutting barrel, and then the drill is started. By setting an elastic part, the plunger is facilitated to move toward the side away from the cutting knife without manual operation, thereby further improving the construction efficiency.
[0020] Optionally, the plunger is fixed with a blocking rod in the first tube, the setting direction of the blocking rod is perpendicular to the axial direction of the connecting tube, the blocking rod is close to the first tube and away from the second tube, and the pushing ball is located on the side of the blocking rod close to the second tube.
[0021] By adopting the above technical solution and providing a blocking rod, it is helpful to prevent the ball from being pushed out of the first tube.
[0022] Optionally, an elastic retaining ring is fixed in the connecting tube, the elastic retaining ring is close to the end of the first tube away from the second tube, the elastic retaining ring is coaxially arranged with the connecting tube, and the end of the first tube away from the second tube can contact the elastic retaining ring.
[0023] By adopting the above technical solution and providing an elastic retaining ring, the elastic retaining ring can limit the plunger to prevent the plunger from popping out of the connecting tube.
[0024] Optionally, the cutting cylinder is provided with a receiving groove at each cutting opening, the receiving groove is arranged along the axial direction of the cutting cylinder, the receiving groove is communicated with the cutting opening, and the bottom of the receiving groove is lower than the bottom of the cutting opening;
[0025] The cutting knife is divided into a rotating part and a cutting part, the rotating part and the cutting part are integrally arranged, the rotating part and the cutting part are perpendicular to each other, the rotating part is located in the cutting opening, the cutting part is located in the accommodating groove, the outer wall of the cutting part is flush with the outer wall of the cutting tube, the rotating part is elastically rotatably connected to the cutting tube, the side of the rotating part close to the bottom of the cutting opening is set in an arc shape, the cutting part is used to cut pipes, and the cutting part is inlaid with cemented carbide.
[0026] By adopting the above technical solution, when it is necessary to cut the pipe, the new hydraulic internal cutter is lowered to the appropriate position through the drill rod, the plunger pushes the rotating part to rotate, and the cutting part moves synchronously with the rotating part. When it rotates to the appropriate position, the drill rod drives the new hydraulic internal cutter to rotate, and the cutting part cuts the pipe. The side of the rotating part close to the bottom of the cutting port is set to an arc shape to reduce the friction between the cutting knife and the cutting barrel during the rotation process, which is convenient for the cutting knife to rotate; the cutting part is inlaid with hard alloy, which effectively improves the strength of the knife body, increases the cutting performance, and extends the service life of the cutting knife.
[0027] Optionally, a fixing hole is formed on the outer wall of the cutting tube near the cutting opening, and the fixing hole corresponds to the cutting opening one by one.
[0028] By adopting the above technical solution and providing the fixing holes, the weight of the cutting cylinder can be reduced, and it is convenient for personnel to separate the cutting cylinder from the connecting cylinder.
[0029] In summary, the present application includes at least one of the following beneficial technical effects:
[0030] 1. Compared with the related art, the present application changes the cutting diameter of the new hydraulic inner cutter by replacing the cutting barrel, thereby replacing the cutting knife, and then replacing the straightening piece, so as to achieve the effect of using a hydraulic cutter of one caliber to cut multi-level pipes, which is conducive to improving the problem of not being able to flexibly adapt to different pipe calibers;
[0031] 2. By setting the detachable connection between the righting block and the righting joint, it is convenient to add or remove the righting block, which is conducive to the replacement of the righting block and convenient for personnel to perform replacement operations;
[0032] 3. By setting the rotating part near the bottom of the cutting port in an arc shape, the friction between the cutting knife and the cutting cylinder during rotation is reduced, making it easier for the cutting knife to rotate; the cutting part is inlaid with hard alloy, which effectively improves the strength of the knife body, increases the cutting performance, and extends the service life of the cutting knife. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 Schematic diagram of the overall structure of the first viewing angle in this embodiment;
[0034] Figure 2 is a cross-sectional view of the first viewing angle in this embodiment;
[0035] Figure 3 yes Figure 2 A magnified view of middle;
[0036] Figure 4 is a schematic diagram of the overall structure of the second viewing angle in this embodiment;
[0037] Figure 5 is a cross-sectional view of the second viewing angle in this embodiment;
[0038] Figure 6 Schematic diagram of the overall structure of the third viewing angle in this embodiment;
[0039] Figure 7 yes Figure 6 Enlarged view of B.
[0040] Explanation of the accompanying drawings: 1. Connecting assembly; 11. Connecting cylinder; 111. Elastic retaining ring; 12. Plunger; 121. First cylinder; 122. Second cylinder; 123. Blocking rod; 2. Cutting assembly; 21. Cutting cylinder; 211. Cutting opening; 212. Accommodating groove; 214. Mounting hole; 215. Fixing hole; 22. Fixing member; 23. Cutting knife; 231. Rotating part; 232. Cutting part; 3. Pushing assembly; 31. Pushing member; 32. Elastic member; 321. Connecting ring; 322. Spring; 4. Positioning assembly; 41. Positioning cylinder; 411. Limiting hole; 42. Water passing member; 421. Water passing pipe; 422. Limiting screw; 43. Straightening member; 431. Straightening joint; 4311. Mounting groove; 432. Straightening block; 433. Fixing screw. DETAILED DESCRIPTION
[0041] The following is combined with Figure 1-7 This application is described in further detail.
[0042] The embodiment of the present application discloses a novel hydraulic inner cutter. Figure 1 and Figure 2 A novel hydraulic internal cutter includes a connecting component 1, a cutting component 2, a pushing component 3 and a positioning component 4. The cutting component 2 and the pushing component 3 are both arranged on the connecting component 1, and the positioning component 4 is connected to the cutting component 2.
[0043] Reference Figure 1 , Figure 2 and Figure 3The connecting assembly 1 includes a connecting tube 11 and a plunger 12. The connecting tube 11 is hollow. One end of the connecting tube 11 is fixed to the drill rod, and the other end is connected to the cutting assembly 2. The plunger 12 is located in the connecting tube 11. In this embodiment, the plunger 12 is divided into a first tube 121 and a second tube 122. The first tube 121 and the second tube 122 are integrated, and the first tube 121 and the second tube 122 are coaxially arranged. The first tube 121 and the second tube 122 are distributed along the axis direction of the connecting tube 11 toward the side away from the drill rod. The inner diameter of the first tube 121 is larger than the inner diameter of the second tube 122. The outer wall of the first tube 121 fits the inner wall of the connecting tube 11, and the outer wall of the second tube 122 and the inner wall of the connecting tube 11 leave a sliding cavity. The plunger 12 It is slidably connected to the connecting cylinder 11, and the plunger 12 can reciprocate along the axial direction of the connecting cylinder 11; an elastic retaining ring 111 is provided in the connecting cylinder 11, and the elastic retaining ring 111 is located at the end of the first cylinder 121 away from the second cylinder 122, the elastic retaining ring 111 and the connecting cylinder 11 are coaxially arranged, the elastic retaining ring 111 can be fixedly connected to the connecting cylinder 11 by screws, and can also be fixedly connected to the connecting cylinder 11 by clearance fit. In this embodiment, the elastic retaining ring 111 is fixedly connected to the connecting cylinder 11 by clearance fit, and the end of the first cylinder 121 away from the second cylinder 122 can contact the elastic retaining ring 111, and the elastic retaining ring 111 can limit the plunger 12 to prevent the plunger 12 from popping out of the connecting cylinder 11.
[0044] Reference Figure 1 and Figure 2 The cutting assembly 2 includes a cutting cylinder 21, a plurality of fixing members 22 and a plurality of cutting knives 23. The cutting cylinder 21 is located at one end of the connecting cylinder 11 away from the drill rod. The cutting cylinder 21 is hollow and coaxial with the connecting cylinder 11. The cutting cylinder 21 and the connecting cylinder 11 can be detachably connected by screws or by threaded connection. In the present embodiment, the cutting cylinder 21 and the connecting cylinder 11 are detachably connected by threaded connection, which is convenient for separating the cutting cylinder 21 and the connecting cylinder 11. A plurality of cutting openings 211 are provided on the side wall of the cutting cylinder 21. In the present embodiment, the number of the cutting openings 211 is set to three, and the three cutting openings 211 are evenly distributed along the circumference of the cutting cylinder 21. The cutting cylinder 21 is provided with a receiving groove 212 at each cutting opening 211. The receiving groove 212 is arranged along the axial direction of the cutting cylinder 21, the receiving groove 212 is communicated with the cutting opening 211, and the bottom of the receiving groove 212 is lower than the bottom of the cutting opening 211.
[0045] Reference Figure 1 and Figure 2The fixing member 22 corresponds to the cutting opening 211 one-to-one. The fixing member 22 can be a rotating rod, a fixing screw, or a fixing bolt. In this embodiment, the fixing member 22 is a fixing bolt. A mounting hole 214 for the fixing bolt to penetrate is opened at the outer wall of the cutting cylinder 21 near the cutting opening 211. The mounting hole 214 corresponds to the cutting opening 211 one-to-one. The fixing bolt passes through the mounting hole 214 and the accommodating groove 212 in sequence, and both ends of the fixing bolt are elastically rotatably connected to the cutting cylinder 21 through a torsion spring. A fixing hole 215 is opened at the outer wall of the cutting cylinder 21 near the cutting opening 211. The fixing hole 215 corresponds to the cutting opening 211 one-to-one, and the distribution direction of the fixing hole 215 and the mounting hole 214 is perpendicular to the axial direction of the cutting cylinder 21, which is convenient for reducing the weight of the cutting cylinder 21 and facilitating personnel to separate the cutting cylinder 21 and the connecting cylinder 11.
[0046] Reference Figure 1 , Figure 2 and Figure 4 In this embodiment, there are three cutting knives 23, which can effectively improve the cutting stability and cutting efficiency, and the cutting knives 23 correspond to the cutting openings 211 one by one. The cutting knives 23 are divided into a rotating part 231 and a cutting part 232. The rotating part 231 and the cutting part 232 are integrated, and the rotating part 231 and the cutting part 232 are perpendicular to each other. The cutting knife 23 is L-shaped, the rotating part 231 is located in the cutting opening 211, and the cutting part 232 is located in the accommodating groove 212. The outer wall of the cutting part 232 is flush with the outer wall of the cutting cylinder 21, and the fixing bolt is located in the cutting opening 211. One end of the fixing bolt passes through the rotating part 23 1. The rotating part 231 is welded to the fixing bolt, and the rotating part 231 and the fixing bolt rotate synchronously. The rotating part 231 is set in an arc shape near the bottom of the cutting opening 211 to reduce the friction between the cutting knife 23 and the cutting cylinder 21 during the rotation process, which is convenient for the cutting knife 23 to rotate, and the cutting part 232 can cut the pipe; the end of the second cylinder 122 away from the first cylinder 121 can abut against the rotating part 231, and the second cylinder 122 can push the rotating part 231 to rotate. The cutting part 232 is inlaid with hard alloy, which effectively improves the strength of the knife body, increases the cutting performance, and prolongs the service life of the cutting knife 23.
[0047] Reference Figure 4 and Figure 5The pushing assembly 3 includes a pushing member 31 and an elastic member 32. The plunger 12 is provided with a blocking rod 123 in the first tube 121. The setting direction of the blocking rod 123 is perpendicular to the axial direction of the connecting tube 11. The blocking rod 123 is close to the end of the first tube 121 away from the second tube 122. The blocking rod 123 can be welded to the first tube 121 or assembled by embedding it in the first tube 121 through a clearance fit. In this embodiment, the blocking rod 123 is assembled by embedding it in the first tube 121 through a clearance fit; in this embodiment, In the figure, the pushing member 31 is a pushing ball, which is located in the first tube 121 and the blocking rod 123 on the side close to the second tube 122. The pushing ball can close one end of the second tube 122, turn on the mud pump to introduce drilling fluid, and the drilling fluid flows through the connecting tube 11 through the drill pipe. The mud pump and the drilling fluid generate liquid pressure on the pushing ball, and the pushing ball pushes the plunger 12 to move along the axial direction of the connecting tube 11 toward the side away from the drill pipe. The plunger 12 can push the rotating part 231 to rotate, and at this time, the cutting knife 23 is opened.
[0048] Reference Figure 5 The elastic member 32 includes a connecting ring 321 and a spring 322. The connecting ring 321 is coaxially arranged in the connecting tube 11, and the connecting ring 321 is located at one end of the connecting tube 11 close to the cutting tube 21. The connecting ring 321 is fixedly connected to the connecting tube 11 by a threaded connection. The second tube 122 extends into the connecting ring 321, and the second tube 122 is slidably arranged on the connecting ring 321. The spring 322 is located in the sliding cavity, and the spring 322 is sleeved on the outer wall of the second tube 122. One end of the spring 322 is welded to the first tube 121, and the other end is welded to the connecting ring 321. In this embodiment, the spring 322 is a compression spring. When the push ball pushes the plunger 12 to move toward the side away from the drill rod, the spring 322 is compressed, and the spring 322 has elastic potential energy.
[0049] Reference Figure 4 , Figure 5 and Figure 6 The positioning assembly 4 includes a positioning cylinder 41, a water-passing member 42 and a straightening member 43. The positioning cylinder 41 is located on the side of the cutting cylinder 21 away from the connecting cylinder 11. The positioning cylinder 41 is hollow and coaxial with the cutting cylinder 21. The positioning cylinder 41 can be detachably connected to the cutting cylinder 21 by screws or by threaded connection. In this embodiment, the positioning cylinder 41 is detachably connected to the cutting cylinder 21 by threaded connection, which is convenient for disassembly and replacement of the cutting cylinder 21, so as to replace the cutting knife 23 to adapt to the cutting of pipes of different diameters.
[0050] Reference Figure 5 , Figure 6 and Figure 7The water passing part 42 includes a water passing pipe 421 and a limiting screw 422. The water passing pipe 421 is coaxially arranged with the positioning cylinder 41. The water passing pipe 421 is sequentially penetrated through the second cylinder 122, the cutting cylinder 21 and the positioning cylinder 41. The side wall of the positioning cylinder 41 is provided with a limiting hole 411. The limiting screw 422 passes through the limiting hole 411 and is pressed against the water passing pipe 421. The limiting screw 422 can fix the water passing pipe 421. The limiting screw 422 is threadedly connected to the positioning cylinder 41. The height of the water passing pipe 421 can be controlled to adjust the stroke of the plunger 12 and the opening angle of the cutting knife 23 and other parameters. The water passing pipe 421 is To let water flow and stop the stroke of the plunger 12, when the pipe cutting is completed, due to the limited position of the water pipe 421, the water pipe 421 will push the ball top open, causing pressure relief, and the pressure relief alarm is fixed in the first tube 121. The pressure relief alarm can realize pressure relief alarm, and the operator on the well can clearly understand the cutting situation in the hole to avoid repeated cutting and increase the cutting time. The operator on the well can judge whether the cutting is completed by the change of the mud pump pressure. When the cutting is completed, the mud pump is turned off, and the plunger 12 is reset under the action of the spring 322. The cutting knife 23 rotates to the accommodating groove 212, and then the drill is started.
[0051] Reference Figure 6 The straightening member 43 includes a straightening joint 431, a plurality of straightening blocks 432 and a plurality of fixing screws 433. The straightening joint 431 is located at one end of the positioning tube 41 away from the cutting tube 21. The straightening joint 431 is integrated with the positioning tube 41. The straightening joint 431 is evenly spaced along the circumference and has a plurality of mounting grooves 4311. In this embodiment, the number of the mounting grooves 4311 is six. The straightening blocks 432 correspond to the mounting grooves 4311 one by one. The straightening blocks are located in the mounting grooves 4311, and the straightening blocks 432 and the mounting grooves 431 1 fits, one straightening block 432 corresponds to two fixing screws 433, the fixing screws 433 pass through the straightening block 432 and the straightening joint 431 in sequence, the fixing screws 433 are threadedly connected to the straightening block 432 and the straightening joint 431 in sequence, the straightening block 432 is detachably connected to the straightening joint 431 through the fixing screws 433, when it is necessary to cut the pipe, the straightening block 432 fits with the inner wall of the pipe, by replacing the straightening block 432, it can adapt to cutting of pipes of different diameters, the structure is simple, and the operation is safe and convenient.
[0052] The implementation principle of a new type of hydraulic internal cutter in the embodiment of the present application is as follows: when it is necessary to cut the pipe, first, according to the diameter of the pipe to be cut, a suitable cutting assembly 2 and a straightening block 432 are selected, and the cutting assembly 2 is connected with the connecting assembly 1 and the positioning assembly 4, and the new type of hydraulic internal cutter is lowered to the specified position of the pipe through the drill pipe. Subsequently, the mud pump is turned on to introduce drilling fluid, and the drilling fluid flows through the connecting tube 11 through the drill pipe. The liquid pressure generated by the mud pump and the drilling fluid is placed on the pushing ball. At this time, the pushing ball pushes the plunger 12 to move, and the plunger 12 pushes the cutting knife 23 to rotate, and the drill pipe drives the new type of hydraulic internal cutter to rotate. In this process, the cutting knife 23 cuts the pipe. When the cutting is completed, due to the limited position of the water pipe 421, the water pipe 421 will push the ball open to cause pressure relief. The operator on the well can judge whether the cutting is completed by the change in the mud pump pressure, turn off the mud pump, and the plunger 12 is reset under the action of the spring 322. The cutting knife 23 is retracted into the cutting tube 21, and then the drill is started.
[0053] When it is necessary to cut pipes of other different diameters, this can be achieved by replacing the cutting cylinder 21 and the cutting knife 23 , and adding or removing the straightening block 432 .
[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A new type of hydraulic inner cutter, characterized by: The invention comprises a connecting assembly (1), a cutting assembly (2) and a positioning assembly (4); the connecting assembly (1) comprises a connecting tube (11) and a plunger (12); the connecting tube (11) is hollow, one end of the connecting tube (11) is connected to a drill rod, the plunger (12) is slidably arranged in the connecting tube (11), and the plunger (12) reciprocates along the axial direction of the connecting tube (11); The cutting assembly (2) comprises a cutting cylinder (21) and a plurality of cutting knives (23). The cutting cylinder (21) is detachably connected to an end of the connecting cylinder (11) away from the drill pipe. The cutting cylinder (21) is hollow and coaxially arranged with the connecting cylinder (11). The side wall of the cutting cylinder (21) is evenly provided with a plurality of cutting openings (211) along its circumference. The cutting knives (23) correspond to the cutting openings (211) one by one. The cutting knives (23) are located in the cutting openings (211). The cutting knives (23) are elastically rotatably connected to the cutting cylinder (21). The cutting knives (23) rotate toward or away from the side of the cutting cylinder (21). The cutting knives (23) are used to cut pipes. The plunger (12) drives the cutting knives (23) to rotate. The positioning assembly (4) comprises a positioning cylinder (41) and a straightening member (43); the positioning cylinder (41) is detachably connected to a side of the cutting cylinder (21) away from the connecting cylinder (11); the positioning cylinder (41) is coaxially arranged with the cutting cylinder (21); the straightening member (43) is detachably connected to the positioning cylinder (41); and the straightening member (43) is used to abut against the inner wall of the pipe.
2. A novel hydraulic inner cutter according to claim 1, characterized in that: The straightening member (43) comprises a straightening joint (431) and a plurality of straightening blocks (432); the straightening joint (431) is integrally arranged at one end of the positioning tube (41) away from the cutting tube (21); the straightening joint (431) is evenly provided with a plurality of mounting grooves (4311) along its circumference; the straightening blocks (432) correspond to the mounting grooves (4311) one by one; the straightening blocks (432) are located in the mounting grooves (4311); the straightening blocks (432) are detachably connected to the straightening joint (431); and the straightening blocks (432) abut against the inner wall of the pipe.
3. A new type of hydraulic inner cutter according to claim 1, characterized in that: The plunger (12) is divided into a first tube (121) and a second tube (122), the first tube (121) and the second tube (122) are integrally arranged, the first tube (121) and the second tube (122) are coaxially arranged, the first tube (121) and the second tube (122) are distributed along the axis direction of the connecting tube (11) toward a side away from the drill rod, the inner diameter of the first tube (121) is larger than the inner diameter of the second tube (122), the outer wall of the first tube (121) is in contact with the inner wall of the connecting tube (11), and the second tube (122) can push the cutting knife (23) to rotate; The novel hydraulic inner cutter also includes a pushing assembly (3), the pushing assembly (3) includes a pushing member (31), the pushing member (31) is a pushing ball, the pushing ball is located in the first tube (121), the side wall of the pushing ball is in contact with the first tube (121), and the pushing ball can close one end of the second tube (122).
4. A new type of hydraulic inner cutter according to claim 3, characterized in that: The positioning assembly (4) further comprises a water-passing member (42), the water-passing member (42) comprising a water-passing pipe (421) and a limiting screw (422), the water-passing pipe (421) being coaxially arranged with the positioning cylinder (41), the water-passing pipe (421) being sequentially passed through the second cylinder (122), the cutting cylinder (21) and the positioning cylinder (41), the side wall of the positioning cylinder (41) being provided with a limiting hole (411), the limiting screw (422) being passed through the limiting hole (411) and then being pressed against the water-passing pipe (421), the limiting screw (422) being threadedly connected to the positioning cylinder (41), the water-passing pipe (421) having the functions of passing water and stopping the travel of the plunger (12).
5. A novel hydraulic inner cutter according to claim 3, characterized in that: The pushing assembly (3) further comprises an elastic member (32), wherein the elastic member (32) comprises a connecting ring (321) and a spring (322), wherein the connecting ring (321) is coaxially fixed in the connecting tube (11), wherein the connecting ring (321) is located at one end of the connecting tube (11) close to the cutting tube (21), wherein the second tube (122) extends into the connecting ring (321), wherein the second tube (122) is slidably arranged on the connecting ring (321), wherein the spring (322) is sleeved on the outer wall of the second tube (122), wherein one end of the spring (322) is fixed to the first tube (121), and the other end is fixed to the connecting ring (321).
6. A novel hydraulic inner cutter according to claim 5, characterized in that: The plunger (12) is fixed with a blocking rod (123) in the first tube (121); the blocking rod (123) is arranged in a direction perpendicular to the axial direction of the connecting tube (11); the blocking rod (123) is close to the first tube (121) and away from one end of the second tube (122); and the pushing ball is located on the side of the blocking rod (123) close to the second tube (122).
7. A novel hydraulic inner cutter according to claim 3, characterized in that: An elastic retaining ring (111) is fixed inside the connecting tube (11), the elastic retaining ring (111) is close to one end of the first tube (121) away from the second tube (122), the elastic retaining ring (111) is coaxially arranged with the connecting tube (11), and one end of the first tube (121) away from the second tube (122) can contact the elastic retaining ring (111).
8. A novel hydraulic inner cutter according to claim 1, characterized in that: The cutting cylinder (21) is provided with a receiving groove (212) at each cutting opening (211), the receiving groove (212) is arranged along the axial direction of the cutting cylinder (21), the receiving groove (212) is communicated with the cutting opening (211), and the bottom of the receiving groove (212) is lower than the bottom of the cutting opening (211); The cutting knife (23) is divided into a rotating part (231) and a cutting part (232). The rotating part (231) and the cutting part (232) are integrally arranged. The rotating part (231) and the cutting part (232) are arranged perpendicular to each other. The rotating part (231) is located in the cutting opening (211), and the cutting part (232) is located in the accommodating groove (212). The outer wall of the cutting part (232) is flush with the outer wall of the cutting tube (21). The rotating part (231) is elastically rotatably connected to the cutting tube (21). The rotating part (231) is arranged in an arc shape on one side close to the bottom of the cutting opening (211). The cutting part (232) is used for cutting pipes. The cutting part (232) is inlaid with hard alloy.
9. A novel hydraulic inner cutter according to claim 1, characterized in that: A fixing hole (215) is provided on the outer wall of the cutting cylinder (21) near the cutting opening (211), and the fixing hole (215) corresponds one-to-one to the cutting opening (211).