Oilfield wellhead petroleum casing cutting device

Abstract

The present invention relates to the technical field of oilfield construction auxiliary equipment, and in particular to an oilfield wellhead oil casing cutting device. It comprises a fixed shell, the fixed shell is rotatably provided with a rotating shell, the rotating shell is slidably provided with a spline rod through a first bracket, the spline rod is fixedly connected with a first fixed plate, the first fixed plate is fixedly connected with a fixed column, the fixed column is slidably provided with a first sliding plate, the first sliding plate is provided with a cutting knife, the first fixed plate is fixedly connected with a second bracket, the second bracket is rotatably provided with a first threaded rod, the first threaded rod is provided with a second sliding plate that slides with the fixed column, a first spring is installed between the second sliding plate and the first sliding plate, the rotating shell is provided with a uniform speed pushing mechanism, and the fixed shell is provided with a fixing mechanism. The present invention utilizes the deformation of the first spring to buffer and protect the cutting knife of the first sliding plate, and the cutting depth of the cutting knife during the rotation process is kept constant by the uniform speed pushing mechanism, thereby improving the cutting efficiency of the cutting knife on the casing, and quickly fixing casings of different specifications by the fixing mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of oilfield construction auxiliary equipment, in particular to an oilfield wellhead petroleum casing cutting device. Background Art

[0002] The oil casing is used to support the well wall of the oil well and ensure the normal use of the oil well. When the casing at the wellhead of the oil field needs to be cut, the existing cutter needs to be fixed on the casing at the wellhead of the oil field, and then the casing is cut by the cutter. The two power parts in the cutter make the cutter rotate circumferentially and move into the casing along the radius of the casing. When the two power parts work at a uniform speed, the cutting depth of the cutter is always kept consistent. As the cutter works, the cutting radius of the cutter gradually becomes smaller, and the cutting distance of the cutter rotating one circle gradually becomes shorter. The cutting efficiency of the cutter decreases, resulting in a longer time for casing cutting. By changing the circumferential rotation rate of the cutting knife so that the cutting rate of the cutting knife remains uniform and stable, the time taken by the cutting knife to rotate one circle gradually decreases, but at this time the cutting knife maintains a uniform movement in the radial direction of the casing, resulting in the cutting depth of the cutting knife gradually decreasing during the cutting process, and the time taken for casing cutting cannot be effectively increased. If the moving speed of the cutting knife in the radial direction of the casing is adjusted again, the operating frequencies of the two power parts need to be regulated differently, which may easily cause the cutting knife to move too fast in the radial direction of the casing, causing the cutting depth of the cutting knife to gradually increase, that is, the resistance encountered by the cutting knife increases, resulting in the cutting knife breaking and damage during the casing cutting process.

[0003] Aiming at the deficiencies of the existing technology, we have developed an oilfield wellhead petroleum casing cutting device to meet the needs of actual use. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides an oilfield wellhead petroleum casing cutting device.

[0005] The technical scheme is as follows: an oil wellhead oil casing cutting device, comprising a fixed shell, a control terminal is installed on the side wall of the fixed shell, a rotating shell is rotatably provided on the fixed shell, a first bracket symmetrically distributed in the circumferential direction is fixedly connected to the rotating shell, a spline rod is slidably provided on the first bracket, a first fixed plate is fixedly connected to the spline rod, a symmetrically distributed fixed column is slidably provided on the side of the first fixed plate away from the spline rod, a first sliding plate is slidably provided on the symmetrically distributed fixed column, a cutting knife is installed on the first sliding plate, a second bracket is fixedly connected to the first fixed plate, a first threaded rod is rotatably provided on the second bracket, and a second sliding plate is provided on the first threaded rod The second sliding plate is slidably connected to the fixed column, a symmetrically distributed first spring is installed between the second sliding plate and the first sliding plate, a first gear ring is fixedly connected to the lower side of the rotating shell, the fixed shell is fixedly connected to the pneumatic motor through the connecting frame, the output shaft of the pneumatic motor is installed with a first gear, the first gear is meshed with the first gear ring, the rotating shell is provided with a uniform speed pushing mechanism for pushing the cutting knife on the first sliding plate to move at a uniform speed, the fixed shell is provided with a fixing mechanism for clamping pipes of different diameters, the pneumatic motor is electrically connected to the control terminal, and the elastic deformation of the first spring is utilized to provide a buffer distance for the cutting knife on the first sliding plate.

[0006] More preferably, the cutting knives of the symmetrical first sliding plate are respectively a planer and a beveling knife, and both are detachably mounted and used for cutting bevels of different angles on the casing.

[0007] More preferably, the uniform speed pushing mechanism includes a second gear ring, the second gear ring is fixedly connected to the fixed shell, the rotating shell is rotated to be provided with a second gear distributed circumferentially symmetrically, the second gear and the second gear ring are meshed, the rotating shell is fixedly connected to a gear box distributed circumferentially symmetrically, the rotating shell is rotated through a connecting frame to be provided with a second threaded rod distributed circumferentially symmetrically, adjacent second threaded rods and the second gear are transmitted through adjacent gear boxes, the second threaded rod is provided with a first sliding block, the upper end of the rotating shell is provided with a guide groove distributed circumferentially symmetrically, the guide groove of the rotating shell is slidingly provided with a first ratchet, the first ratchet and the first sliding block are fixed, the circumferentially symmetrically distributed spline rods are provided with a separation component for cooperating with the adjacent first ratchet, and the separation component is used to quickly adjust the position of the first sliding plate.

[0008] More preferably, the separation assembly includes a second fixed plate, the second fixed plate is fixed to one end of the spline rod away from the first fixed plate, the second fixed plate is slidably provided with a first sliding frame, the first sliding frame is fixed with a second ratchet bar that cooperates with the first ratchet bar, and a second spring is installed between the second ratchet bar and the second fixed plate.

[0009] More preferably, the fixing mechanism includes a third gear ring, the fixed shell is provided with an annular cavity, the third gear ring is rotatably arranged in the annular cavity of the fixed shell, the annular cavity of the fixed shell is rotatably provided with a third gear evenly distributed circumferentially, the third gear and the third gear ring are meshed, the fixed shell is slidably provided with a rack evenly distributed circumferentially, the rack is meshed with an adjacent third gear, the inner ends of the circumferentially distributed racks are provided with arc-shaped support blocks, and the fixed shell is provided with a quick adjustment component for quick movement of the rack.

[0010] More preferably, the arc-shaped support block of the rack is provided with an elastic protective layer for increasing the friction between the arc-shaped support block on the rack and the sleeve.

[0011] More preferably, the quick adjustment assembly includes a third bracket, the third bracket is fixed to the side wall of the fixed shell, the third bracket is rotatably provided with a third threaded rod, the third threaded rod is provided with a second sliding block, the third bracket is provided with a sliding groove, the sliding groove of the third bracket is slidably provided with a third ratchet, the third ratchet and the second sliding block are fixed, one of the racks is fixed with a third fixed plate, the third fixed plate is slidably connected to the second sliding frame, the second sliding frame is fixed with a fourth ratchet cooperating with the third ratchet, and a third spring is installed between the fourth ratchet and the third fixed plate.

[0012] More preferably, it also includes a symmetrically distributed cooling mechanism, which is arranged on the fixed shell, and is used to reduce the temperature between the pipe fitting and the cutting knife. The cooling mechanism includes a liquid storage shell, which is fixedly connected to the side wall of the rotating shell, and the liquid storage shell is embedded with a conduit. A water pump is installed on the liquid storage shell, and the water pump is connected to the conduit. The water pump is electrically connected to the control terminal, and a nozzle is provided at the other end of the conduit. The nozzle of the conduit is fixedly connected to the adjacent second bracket through a connecting block, and the nozzle of the conduit points to the cutting knife of the first sliding plate. The upper end of the rotating shell is fixedly connected to the first fixed block, and the first fixed block is slidably provided with symmetrically distributed sliding columns, and the sliding column is fixedly connected to the collecting shell, and the collecting shell is connected to the liquid storage shell through a pipeline. One end of the collecting shell close to the second bracket is set to an arc shape, and the arc end of the collecting shell is provided with an elastic member for fitting the side wall of the sleeve, and the arc end of the collecting shell is evenly provided with balls for reducing the friction between it and the sleeve, and the middle thread of the first fixed block is provided with a fourth threaded rod, and the fourth threaded rod is rotatably provided with a limit block for fixing the sliding column.

[0013] More preferably, the longitudinal cross-section of the liquid storage shell chamber is trapezoidal, and the liquid storage shell is provided with evenly distributed through holes to increase the contact area between the liquid and the air in the liquid storage shell.

[0014] More preferably, it also includes a symmetrically distributed protection mechanism, which is arranged on the first sliding plate and is used to release the cooperation between the first ratchet and the second ratchet. The protection mechanism includes an L-shaped rod, which is fixed to the first sliding plate, and the L-shaped rod penetrates the second sliding plate and the first fixed plate and is slidably connected to the two. The first sliding frame is fixed with a second fixed block that cooperates with the L-shaped rod, and the side of the second fixed block that contacts with the L-shaped rod is set to an inclined shape. The second fixed plate has a sliding rod for limiting sliding, and the sliding rod is limited by the second fixed block, and a tension spring is installed between the sliding rod and the second fixed plate.

[0015] Compared with the prior art, the technical effect achieved by the present invention is as follows: the present invention utilizes the deformation of the first spring to perform buffering protection on the cutting knife of the first sliding plate, and makes the second threaded rod pass through the connected parts through the uniform speed pushing mechanism, so that the cutting knife of the first sliding plate rotates one circle, and the moving distance of the cutting knife along the radial direction of the rotating shell is always consistent, that is, the cutting depth of the cutting knife in the cutting process is always consistent and uniform, and then the power of the pneumatic motor is gradually increased to improve the cutting efficiency of the cutting knife on the sleeve, so that the cutting rate of the cutting knife on the first sliding plate to the sleeve is always maintained in the best state, and the arc-shaped support blocks of the three racks are quickly and synchronously moved to clamp the sleeve through the fixing mechanism, so as to realize the rapid adjustment of the device, and the cooling liquid is sprayed on the cutting knife of the first sliding plate through the duct of the cooling mechanism to cool it down, so as to avoid the cutting knife on the first sliding plate from being damaged due to temperature and improve the cutting efficiency, and then cooperate with the collecting shell to recover the cooling liquid and save the cooling liquid, and the cooperation between the second spine and the first spine is released through the cooperation of the L-shaped rod and the second fixing block in the protection mechanism, so as to avoid the cutting knife on the first sliding plate from being overloaded and breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a partial cross-sectional view of the fixed shell of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the spline rod of the present invention.

[0019] Figure 4 It is a cross-sectional view of the second bracket of the present invention.

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the uniform speed pushing mechanism of the present invention.

[0021] Figure 6 It is a cross-sectional view of the fixing mechanism of the present invention.

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the cooling mechanism of the present invention.

[0023] Figure 8 It is a cross-sectional view of the first fixing block of the present invention.

[0024] Fig. 9 It is a cross-sectional view of the liquid storage shell of the present invention.

[0025] Fig.10 It is a three-dimensional structural schematic diagram of the protection mechanism of the present invention.

[0026] The markings of the components in the accompanying drawings are as follows: 1-fixed shell, 101-rotating shell, 102-first bracket, 103-spline rod, 104-first fixed plate, 105-fixed column, 106-first sliding plate, 107-second bracket, 108-first threaded rod, 109-second sliding plate, 110-first spring, 111-first gear ring, 112-pneumatic motor, 113-first gear, 2-second gear ring, 201-second gear, 202-gear box, 203-second threaded rod, 204-first sliding block, 205-first ratchet, 3-second fixed plate, 301-first sliding Moving frame, 302-second ratchet, 303-second spring, 4-third gear ring, 401-third gear, 402-rack, 5-third bracket, 501-third threaded rod, 502-second sliding block, 503-third ratchet, 504-third fixed plate, 505-second sliding frame, 506-fourth ratchet, 507-third spring, 6-liquid storage shell, 601-conduit, 602-first fixed block, 603-sliding column, 604-collecting shell, 605-fourth threaded rod, 606-limiting block, 7-L-shaped rod, 701-second fixed block, 702-sliding rod, 703-tension spring. DETAILED DESCRIPTION

[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention. Example 1

[0028] An oilfield wellhead oil casing cutting device, as shown in the attached Figure 1 -Attached Figure 4As shown, it includes a fixed shell 1, the side wall of the fixed shell 1 is provided with a control terminal, the upper part of the fixed shell 1 is rotatably connected to a rotating shell 101, the upper end of the rotating shell 101 is bolted to two circumferentially symmetrical first brackets 102, the two first brackets 102 are slidably connected to a spline rod 103, the inner ends of the two spline rods 103 are provided with a group of cutting pieces, a group of cutting pieces includes a first fixed plate 104, the first fixed plate 104 is fixedly connected to adjacent spline rods 103, two fixed columns 105 are fixedly connected to the side of the first fixed plate 104 away from the spline rod 103, the two fixed columns 105 are slidably connected to a first sliding plate 106, the first sliding plate 106 is installed with a detachable cutting knife, and the cutting knives of the two first sliding plates 106 are a planer and a beveling knife, respectively, by replacing the beveling knives with different inclinations, it can perform beveling cutting on the casing at different angles, the upper end of the first fixed plate 104 is welded with a second bracket 107, the second bracket 107 is rotatably connected to The first threaded rod 108 is threadedly connected with a second sliding plate 109 that slides with the fixed column 105. Two first springs 110 are fixedly connected between the second sliding plate 109 and the first sliding plate 106. The two first springs 110 are respectively sleeved on the two fixed columns 105. The lower side of the rotating shell 101 is bolted with a first ring gear 111. The fixed shell 1 is bolted with a pneumatic motor 112 through a connecting frame. The output shaft key of the pneumatic motor 112 is connected with a first gear 113. The first gear 113 is meshed with the first ring gear 111. The rotating shell 101 is provided with a uniform speed pushing mechanism for pushing the cutting knife on the first sliding plate 106 to move at a uniform speed. The fixed shell 1 is provided with a fixing mechanism for clamping pipes of different diameters, which is convenient for operators to make quick adjustments and reduce the time used for adjustment. The pneumatic motor 112 is electrically connected to the control terminal, and the elastic deformation of the first spring 110 is used to provide a buffer distance for the cutting knife on the first sliding plate 106.

[0029] As attached Figure 3 and attached Figure 5As shown, the uniform speed pushing mechanism includes a second gear ring 2, which is bolted to the upper end of the fixed shell 1, and the rotating shell 101 is rotatably connected to two second gears 201 meshing with the second gear ring 2. The upper end of the rotating shell 101 is bolted to two gear boxes 202. The rotating shell 101 is rotatably connected to two circumferentially symmetrical second threaded rods 203 through a connecting frame. Adjacent second threaded rods 203 and second gears 201 are transmitted through adjacent gear boxes 202. The second threaded rods 203 are threadedly provided with a first sliding block 204, and the upper end of the rotating shell 101 is provided with There are two guide grooves, and the first ratchet 205 is slidably connected in the two guide grooves of the rotating shell 101. The first ratchet 205 is fixedly connected to the adjacent first sliding block 204. The two spline rods 103 are provided with a separation component for cooperating with the adjacent first ratchet 205. The separation component is used to quickly adjust the position of the first sliding plate 106. During the cutting process of the casing, when the cutting knife on the first sliding plate 106 rotates one circle, the moving distance of the cutting knife along the radial direction of the rotating shell 101 is always consistent, that is, the cutting depth of the cutting knife during the cutting process is always consistent and uniform.

[0030] As attached Figure 5 As shown, the separation component includes a second fixed plate 3, which is installed on the spline rod 103, and the second fixed plate 3 is slidably connected to the first sliding frame 301. The first sliding frame 301 is welded with a second ratchet 302 that cooperates with the first ratchet 205, and two second springs 303 are fixedly connected between the second ratchet 302 and the second fixed plate 3. The two second springs 303 are both sleeved on the first sliding frame 301. The unidirectional mobility of the first ratchet 205 and the second ratchet 302 makes it easy for the operator to quickly move the cutting knife of the first sliding plate 106 to fit the side wall of the sleeve through the connected parts. After the sleeve is cut, the operator releases the cooperation between the first ratchet 205 and the second ratchet 302 by pulling out the first sliding frame 301 and the second ratchet 302, so that the operator can quickly move and reset the first sliding plate 106.

[0031] As attached Figure 6As shown, the fixing mechanism includes a third gear ring 4, and the fixed shell 1 is provided with an annular cavity. The third gear ring 4 is rotatably connected in the annular cavity of the fixed shell 1. The annular cavity of the fixed shell 1 is rotatably connected with three third gears 401, and the three third gears 401 are all meshed with the third gear ring 4. The fixed shell 1 is slidably connected with three racks 402. The inner ends of the three racks 402 are provided with arc-shaped support blocks that fit with the side wall of the sleeve. The arc-shaped support blocks of the racks 402 are provided with a rubber layer. The arc-shaped support blocks of the three racks 402 move synchronously to fit the sleeve. Under the action of the rubber layer, the friction between the arc-shaped support blocks on the racks 402 and the sleeve is improved. At the same time, the deformation property of the rubber layer prevents impurities on the sleeve from affecting the clamping stability of the arc-shaped support blocks on the three racks 402. The racks 402 are meshed with the adjacent third gears 401, and the fixed shell 1 is provided with a quick adjustment component for rapid movement of the racks 402.

[0032] As attached Figure 6 As shown, the quick adjustment assembly includes a third bracket 5, the third bracket 5 is welded to the side wall of the right part of the fixed shell 1, the third bracket 5 is rotatably connected to the third threaded rod 501, the third threaded rod 501 is threadedly provided with a second sliding block 502, the third bracket 5 is provided with a slide groove, the slide groove of the third bracket 5 is slidably connected to the third ratchet 503, the third ratchet 503 is fixedly connected to the second sliding block 502, the right end of the right rack 402 is bolted to the third fixed plate 504, the third fixed plate 504 is slidably connected to the second sliding frame 505, and the second sliding frame 505 is welded A fourth ratchet 506 cooperates with the third ratchet 503, and two third springs 507 are fixedly connected between the fourth ratchet 506 and the third fixed plate 504. The two third springs 507 are both mounted on the second sliding frame 505. Through the unidirectional transmission of the third ratchet 503 and the second sliding block 502, the three racks 402 can be quickly and synchronously moved to fit the sleeve. In combination with the rotation of the third threaded rod 501, the rack 402 can be further moved to extrude the sleeve, so that sleeves of different specifications can be clamped and fixed quickly, saving the time used for fixing the device and the sleeve.

[0033] The operator holds the fixed shell 1 and puts it on the sleeve. In the initial state, the fourth ratchet 506 and the third ratchet 503 cooperate under the action of the third spring 507. At this time, the third ratchet 503 restricts the fourth ratchet 506 from moving to the right, but the resistance of the fourth ratchet 506 to the left on the third ratchet 503 is extremely small, and the third gear ring 4 and the fixed shell 1 rotate freely. In summary, it can be concluded that the resistance to the left movement of the rack 402 is extremely small, and then the operator pushes the rack 402 to move to the left, and the rack 402 drives the third fixed plate 504 and the parts connected thereto to move together. During this process, the third ratchet 503 and the fourth ratchet 506 are always in fit.

[0034] At the same time, the movement of the rack 402 drives the adjacent third gear 401 to rotate, and the rotation of the third gear 401 causes the third gear ring 4 to rotate. The rotation of the third gear ring 4 drives the other two racks 402 to move through the other two third gears 401, that is, the three racks 402 are synchronously moved together, so that the arc-shaped support blocks of the racks 402 quickly fit the side wall of the casing, so that the center line of the casing coincides with the center line of the fixed shell 1. When the arc-shaped support blocks of the three racks 402 are close to the side wall of the casing, the operator rotates the third threaded rod 501, and the rotation of the third threaded rod 501 drives the second sliding block 502 and the third ratchet 503 to continue to move left, and the third ratchet 5 03 The movement drives the fourth ratchet 506 to continue to move left, and the fourth ratchet 506 moves left and repeats the above operation, so that the three racks 402 continue to move closer to each other, that is, the arc-shaped support blocks of the three racks 402 further squeeze the sleeve, and the rubber layer of the arc-shaped support blocks on the rack 402 increases the friction between the arc-shaped support blocks of the rack 402 and the sleeve, and further strengthens the fixation between the arc-shaped support blocks on the rack 402 and the sleeve. At this time, the sleeve is clamped by the arc-shaped support blocks of the three racks 402, so that the device is fixed on the sleeve, and at the same time the rubber layer can be deformed to prevent impurities on the outer wall of the sleeve from affecting the centering fixation between the fixed shell 1 and the sleeve.

[0035] When fixing sleeves of different diameters, the operator pushes the rack 402 to move quickly so that the arc-shaped support block of the rack 402 is close to the sleeve, and then rotates the third threaded rod 501 to increase the extrusion force between the arc-shaped support block on the rack 402 and the sleeve, thereby completing the fast and efficient fixation between the fixed shell 1 and the sleeve. When the cutting is completed, the operator first rotates the third threaded rod 501 in the opposite direction to loosen the fixation between the arc-shaped support block on the rack 402 and the sleeve, and then the operator pulls out the second sliding frame 505, so that the second sliding frame 505 drives the fourth ratchet 506 to move, and compresses the third spring 507, so that the fourth ratchet 506 moves to release the cooperation with the third ratchet 503, and then the rack 402 is quickly moved to the right to reset, so that the operator can quickly disassemble the device and make the use of the device more convenient.

[0036] After completing the fixation of the fixed shell 1, the operator pushes the two spline rods 103 together, and the movement of the spline rod 103 drives the adjacent second fixed plate 3, the first sliding frame 301 and the second ratchet 302 to move. Under the action of the second spring 303, the first sliding frame 301 and the second ratchet 302 vibrate back and forth during the movement, but the second ratchet 302 is always in contact with the first ratchet 205, and the first ratchet 205 limits the second ratchet 302 from moving outward. At the same time, the spline rod 103 moves through the parts connected thereto, driving the first sliding plate 106 to move together, so that the cutting knife of the first sliding plate 106 moves to fit the side wall of the sleeve. Since the elastic coefficient of the first spring 110 is large, the first sliding plate 106 is fixed relative to the fixed column 105.

[0037] When the cutting knives of the two first sliding plates 106 move to fit the side wall of the casing, the operator starts the pneumatic motor 112 through the control terminal, and the pneumatic motor 112 drives the rotating shell 101 and the parts thereon to rotate together through the first gear 113 and the first gear ring 111, so that the cutting knives of the two first sliding plates 106 rotate circumferentially. At the same time, the rotating shell 101 rotates to drive the two second gears 201 to rotate circumferentially around the second gear ring 2, so that the two second gears 201 rotate on their own. The second gear 201 rotates on its own and drives the adjacent second threaded rod 203 to rotate slowly through the adjacent gear box 202, wherein the gear box 202 is a reduction box, and the rotation of the second threaded rod 203 causes the first sliding block 204 and the first ratchet 205 to move slowly toward the center of the rotating shell 101. Due to the characteristics of the mechanical transmission here, when the first sliding plate 106 rotates one circle, the moving distance of the cutting knife on the first sliding plate 106 along the radial direction of the rotating shell 101 remains consistent, that is, the cutting depth of the cutting knife during the cutting process remains consistent and uniform.

[0038] Finally, the cutting knives of the two first sliding plates 106 rotate circumferentially and move toward the middle of the rotating shell 101, and the cutting knives of one of the first sliding plates 106 cut the casing. At the same time, the control terminal controls the power of the pneumatic motor 112 to gradually increase, so that the rotation speed of the rotating shell 101 gradually increases. In the process that the radius of the circular ring where the casing and the cutting knives on the first sliding plate 106 contact each other gradually becomes smaller, the rotating shell 101 drives the cutting knives on the first sliding plate 106 to rotate circumferentially at a rate that gradually becomes faster, ensuring that the cutting distance of the cutting knives on the first sliding plate 106 remains stable within the same time, that is, the cutting rate of the cutting knives on the casing on the first sliding plate 106 remains stable and uniform, and the cutting depth of the cutting knives is uniform and stable, so that the device is in the best working state (wherein the planer cuts the casing, and the beveler performs a beveling operation on the cut casing).

[0039] When the cutting and beveling of the casing are completed, the operator stops the pneumatic motor 112 through the control terminal, and then the operator pulls out the first sliding frame 301 and the second ratchet 302. The second ratchet 302 moves to compress the second spring 303, and the second ratchet 302 moves to release the cooperation with the first ratchet 205. The operator then pulls the spline rod 103 and the parts connected to it to quickly move and reset. Then the operator releases the first sliding frame 301, so that the first sliding frame 301 and the second ratchet 302 are reset and contacted and cooperated with the first ratchet 205 again, so that the operator can quickly remove the device from the casing after use.

[0040] During the planing process, if the cutting depth of the cutting knife on the first sliding plate 106 becomes smaller, as the spline rod 103 moves toward the center of the rotating shell 101, the first sliding plate 106 moves relative to the fixed column 105 and compresses the first spring 110, thereby buffering the cutting knife of the first sliding plate 106 and preventing the cutting knife on the first sliding plate 106 from being broken or damaged due to excessive resistance. At the same time, the compression force of the first spring 110 increases, thereby increasing the cutting force of the cutting knife on the first sliding plate 106 on the sleeve, thereby facilitating subsequent cutting. Example 2

[0041] Based on Example 1, as shown in the attached Figure 7 -Attached Fig. 9 As shown, it also includes two sets of cooling mechanisms, both of which are arranged on the fixed shell 1, and the cooling mechanism is used to reduce the temperature between the pipe fitting and the cutting knife. The cooling mechanism includes a liquid storage shell 6, and the outer edge of the longitudinal section of the chamber of the liquid storage shell 6 is trapezoidal, and the liquid storage shell 6 is provided with evenly distributed through holes, Fig. 9 As shown, the through hole of the liquid storage shell 6 is equivalent to embedding a section of circular tube in the middle thereof, thereby increasing the contact area between the liquid in the liquid storage shell 6 and the outside air, and facilitating the heat dissipation and cooling of the liquid in the liquid storage shell 6. The liquid storage shell 6 is bolted to the side wall of the rotating shell 101, and the liquid storage shell 6 is embedded with a conduit 601. A water pump is installed at the lower end of the conduit 601, and the water pump is electrically connected to the control terminal. A nozzle is provided at the other end of the conduit 601, and the nozzle of the conduit 601 is bolted to the adjacent second bracket 107 through a connecting block. The nozzle of the conduit 601 points to the cutting knife of the first sliding plate 106, so that the nozzle of the conduit 601 continuously sprays coolant to the cutting position of the cutting knife and the sleeve to cool down, thereby improving the working stability of the cutting knife. The upper end of the rotating shell 101 is bolted to the first fixed block 602, and the first fixed block 602 is slidably connected to Two sliding columns 603 are fixedly connected with a collecting shell 604, and the collecting shell 604 is connected with the liquid storage shell 6 through a pipeline. The end of the collecting shell 604 close to the second bracket 107 is set to an arc shape, and the collecting shell 604 is located directly below the second bracket 107, which is used to collect the sprayed coolant and save the coolant. The arc end of the collecting shell 604 is provided with an elastic member for fitting the side wall of the sleeve, and the arc end of the collecting shell 604 is evenly provided with balls for reducing the friction between it and the sleeve. The middle thread of the first fixed block 602 is provided with a fourth threaded rod 605, and the fourth threaded rod 605 is rotatably connected with a limit block 606 for fixing the sliding column 603. The collecting shell 604 is used to recycle and reuse the sprayed coolant, and combined with the through hole of the liquid storage shell 6 during the rotation process, the cooling of the coolant is accelerated.

[0042] After completing the adjustment before cutting the casing, the operator rotates the fourth threaded rod 605 to release the upper limit block 606 from squeezing the sliding column 603. Under the action of the fourth threaded rod 605, the collecting shell 604 moves to fit closely to the side wall of the casing. Under the action of the balls on the collecting shell 604, the friction between it and the casing is reduced. At the same time, the rubber strip on it is deformed to fit closely to the side wall of the casing, which is convenient for fitting with casings of different diameters. Then the operator rotates the fourth threaded rod 605 in the opposite direction to reset the upper limit block 606, and re-completes the fixation of the sliding column 603 and the collecting shell 604.

[0043] Then, when the control terminal starts the pneumatic motor 112 to perform the above-mentioned casing cutting operation, the control terminal simultaneously starts the water pump of the conduit 601. The water pump works to spray the coolant in the liquid storage shell 6 through the nozzle of the conduit 601. The sprayed coolant is sprinkled on the cutting knife of the first sliding plate 106, so as to cool the cutting knife and the casing during the cutting process, thereby preventing the cutting knife on the first sliding plate 106 from being damaged due to temperature. Subsequently, the sprayed coolant flows along the casing into the collecting shell 604, and the coolant collected in the collecting shell 604 flows into the liquid storage shell 6 through the pipe thereon, so as to recycle the sprayed coolant, and at the same time, the filter screen of the collecting shell 604 filters the impurities entering it.

[0044] At the same time, when the rotating shell 101 drives the liquid storage shell 6 to rotate, air quickly passes through the through holes of the liquid storage shell 6 to dissipate the heat of the coolant in the liquid storage shell 6. At the same time, the liquid storage shell 6 rotates together with the rotating shell 101. Under the action of the circumferential rotation of the liquid storage shell 6, the coolant gathers in the liquid storage shell 6 toward the side away from the rotating shell 101, so that the water pump is always immersed in the coolant, which is convenient for the water pump to continuously extract the coolant in the liquid storage shell 6. Example 3

[0045] Based on Example 2, as shown in the attached Fig.10As shown, it also includes two sets of protection mechanisms, which are respectively arranged on the two first sliding plates 106. The protection mechanisms are used to release the cooperation between the first ratchet 205 and the second ratchet 302. The protection mechanism includes an L-shaped rod 7, which is welded to the first sliding plate 106, and the L-shaped rod 7 penetrates the second sliding plate 109 and the first fixed plate 104 and is slidably connected to the two. The first sliding frame 301 is bolted to the second fixed block 701, and the first sliding frame 301 is in contact with the L-shaped rod 7, and the side of the second fixed block 701 in contact with the L-shaped rod 7 is set to an inclined shape. When the cutting knife on the first sliding plate 106 is When the cutting depth gradually decreases, the moving distance of the first sliding plate 106 relative to the fixed column 105 gradually increases, so that the L-shaped rod 7 moves to squeeze the second fixed block 701 to move, and the second fixed block 701 drives the first sliding frame 301 and the second ratchet 302 to move. The second ratchet 302 moves to release the contact with the first ratchet 205, interrupting the power transmission to prevent the cutting knife on the sliding plate 106 from breaking. The second fixed plate 3 has a sliding rod 702 for limiting sliding, and the sliding rod 702 cooperates with the second fixed block 701. A tension spring 703 is fixed between the sliding rod 702 and the second fixed plate 3, and the tension spring 703 is sleeved on the sliding rod 702.

[0046] Since the cutting knife of the first sliding plate 106 is seriously worn out after long-term work, when the casing is cut again, the cutting knife of the first sliding plate 106 will not be able to effectively cut the casing. At this time, the first sliding plate 106 moves relative to the fixed column 105, even if the L-shaped rod 7 moves relative to the spline rod 103, that is, the L-shaped rod 7 squeezes the second fixed block 701 to move, the second fixed block 701 drives the first sliding frame 301 and the second ratchet 302, and compresses the second spring 303, the second ratchet 302 moves to release the cooperation with the first ratchet 205, and at the same time, under the action of the tension spring 703, the sliding rod 702 moves to limit the positioning of the second fixed block 701, so that the second ratchet 302 remains in the moved state. At this time, the cutting knife of the first sliding plate 106 is separated from the cutting of the casing, avoiding the cutting knife on the first sliding plate 106 from gradually increasing resistance and breaking. Example 4

[0047] On the basis of Example 3, during the process of cutting casings of different materials, the operator can change the specifications of the gear box 202, change the speed at which the cutting knife on the first sliding plate 106 moves toward the middle of the rotating shell 101, thereby changing the cutting depth of the cutting knife on the first sliding plate 106, so that the cutter is in an efficient and optimal working state when cutting different pipe fittings. At the same time, the operator rotates the first threaded rod 108 through a wrench, and the rotation of the first threaded rod 108 causes the second sliding plate 109 to move and compress the first spring 110, thereby changing the elastic force between the first spring 110 and the first sliding plate 106, so that when the device cuts casings of different hardnesses, the size of the elastic buffering force applied to the cutting knife on the first sliding plate 106 is different, thereby effectively protecting the cutting knife on the first sliding plate 106 and preventing it from breaking due to excessive resistance.

[0048] It should be pointed out that the above preferred embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A wellhead oil casing cutting device for an oil field, comprising a fixed shell (1), a control terminal being installed on a side wall of the fixed shell (1), a rotating shell (101) being rotatably provided on the fixed shell (1), a first bracket (102) being fixedly connected to the rotating shell (101) being symmetrically distributed in the circumferential direction, a spline rod (103) being slidably provided on the first bracket (102), a first fixed plate (104) being fixedly connected to the spline rod (103), a symmetrically distributed fixed column (105) being fixedly connected to a side of the first fixed plate (104) away from the spline rod (103), a first sliding plate (106) being slidably provided on the symmetrically distributed fixed column (105), a cutting knife being installed on the first sliding plate (106), wherein the cutting knife is installed on the first sliding plate, wherein the cutting knife is installed on the first sliding plate (106), ... The housing (106) further comprises a second bracket (107), the second bracket (107) being fixedly connected to the first fixed plate (104), the second bracket (107) being rotatably provided with a first threaded rod (108), the first threaded rod (108) being provided with a second sliding plate (109), the second sliding plate (109) being slidably connected to the fixed column (105), a symmetrically distributed first spring (110) being installed between the second sliding plate (109) and the first sliding plate (106), a first gear ring (111) being fixedly connected to the lower side of the rotating housing (101), and the fixed housing (101) being connected to the fixed housing (101) by a screw thread. The frame is fixedly connected with a pneumatic motor (112), the output shaft of the pneumatic motor (112) is equipped with a first gear (113), the first gear (113) is meshed with the first gear ring (111), the rotating shell (101) is provided with a uniform speed pushing mechanism for pushing the cutting knife on the first sliding plate (106) to move at a uniform speed, the fixed shell (1) is provided with a fixing mechanism for clamping pipes of different diameters, the pneumatic motor (112) is electrically connected to the control terminal, and the elastic deformation of the first spring (110) is utilized to provide a buffer distance for the cutting knife on the first sliding plate (106); The uniform speed pushing mechanism comprises a second gear ring (2), the second gear ring (2) is fixedly connected to the fixed shell (1), the rotating shell (101) is provided with a second gear (201) distributed symmetrically in the circumferential direction, the second gear (201) and the second gear ring (2) are meshed, the rotating shell (101) is fixedly connected to a gear box (202) distributed symmetrically in the circumferential direction, the rotating shell (101) is provided with a second threaded rod (203) distributed symmetrically in the circumferential direction, and adjacent second threaded rods (203) and second gears (201) are connected via adjacent The gear box (202) is used for transmission, the second threaded rod (203) is provided with a first sliding block (204), the upper end of the rotating shell (101) is provided with a guide slide groove which is symmetrically distributed in the circumferential direction, the guide slide groove of the rotating shell (101) is slidably provided with a first ratchet (205), the first ratchet (205) and the first sliding block (204) are fixedly connected, and the spline rods (103) which are symmetrically distributed in the circumferential direction are all provided with a separation component for cooperating with an adjacent first ratchet (205), and the separation component is used to quickly adjust the position of the first sliding plate (106).

2. The oilfield wellhead petroleum casing cutting device according to claim 1 is characterized in that: The cutting knives of the symmetrical first sliding plate (106) are respectively a planer knife and a beveling knife, and both are detachably installed and used for cutting bevels of different angles on the casing.

3. The oilfield wellhead petroleum casing cutting device according to claim 1 is characterized in that: The separation assembly comprises a second fixing plate (3), the second fixing plate (3) being fixedly connected to one end of the spline rod (103) away from the first fixing plate (104), the second fixing plate (3) being slidably provided with a first sliding frame (301), the first sliding frame (301) being fixedly connected with a second ratchet (302) cooperating with the first ratchet (205), and a second spring (303) being installed between the second ratchet (302) and the second fixing plate (3).

4. The oilfield wellhead petroleum casing cutting device according to claim 1 is characterized in that: The fixing mechanism comprises a third gear ring (4); the fixing shell (1) is provided with an annular cavity; the third gear ring (4) is rotatably arranged in the annular cavity of the fixing shell (1); the annular cavity of the fixing shell (1) is rotatably provided with a third gear (401) evenly distributed in the circumferential direction; the third gear (401) and the third gear ring (4) are meshed; the fixing shell (1) is slidably provided with a rack (402) evenly distributed in the circumferential direction; the rack (402) is meshed with an adjacent third gear (401); the inner ends of the circumferentially distributed racks (402) are all provided with arc-shaped support blocks; and the fixing shell (1) is provided with a quick adjustment component for quick movement of the rack (402).

5. The oilfield wellhead petroleum casing cutting device according to claim 4 is characterized in that: The arc-shaped support block of the rack (402) is provided with an elastic protective layer, which is used to increase the friction between the arc-shaped support block on the rack (402) and the sleeve.

6. The oilfield wellhead petroleum casing cutting device according to claim 4 is characterized in that: The quick adjustment component comprises a third bracket (5), the third bracket (5) is fixedly connected to the side wall of the fixed shell (1), the third bracket (5) is rotatably provided with a third threaded rod (501), the third threaded rod (501) is provided with a second sliding block (502), the third bracket (5) is provided with a sliding groove, the sliding groove of the third bracket (5) is slidably provided with a third ratchet (503), the third ratchet (503) is fixedly connected to the second sliding block (502), one of the racks (402) is fixedly connected to a third fixed plate (504), the third fixed plate (504) is slidably connected to a second sliding frame (505), the second sliding frame (505) is fixedly connected to a fourth ratchet (506) matched with the third ratchet (503), and a third spring (507) is installed between the fourth ratchet (506) and the third fixed plate (504).

7. The oilfield wellhead petroleum casing cutting device according to claim 1 is characterized in that: The invention also includes a symmetrically distributed cooling mechanism, which is arranged on the fixed shell (1) and is used to reduce the temperature between the pipe fitting and the cutting knife. The cooling mechanism includes a liquid storage shell (6), which is fixedly connected to the side wall of the rotating shell (101), and the liquid storage shell (6) is embedded with a conduit (601). The liquid storage shell (6) is equipped with a water pump, which is connected to the conduit (601), and the water pump is electrically connected to the control terminal. A nozzle is provided at the other end of the conduit (601), and the nozzle of the conduit (601) is fixedly connected to the adjacent second bracket (107) through a connecting block. The nozzle of the conduit (601) points to the cutting knife of the first sliding plate (106). The upper end of the rotating shell (101) is fixedly connected to the first fixed plate (106). The first fixed block (602) is slidably provided with symmetrically distributed sliding columns (603), the sliding columns (603) are fixedly connected with a collecting shell (604), the collecting shell (604) is connected with the liquid storage shell (6) through a pipeline, one end of the collecting shell (604) close to the second bracket (107) is set to be arc-shaped, and the arc-shaped end of the collecting shell (604) is provided with an elastic member for fitting the side wall of the sleeve, and the arc-shaped end of the collecting shell (604) is evenly provided with balls for reducing the friction between the collecting shell (604) and the sleeve, and the middle part of the first fixed block (602) is threadedly provided with a fourth threaded rod (605), and the fourth threaded rod (605) is rotatably provided with a limit block (606) for fixing the sliding column (603).

8. The oilfield wellhead petroleum casing cutting device according to claim 7 is characterized in that the liquid storage The longitudinal cross-section of the chamber of the shell (6) is trapezoidal, and the liquid storage shell (6) is provided with evenly distributed through holes, so as to increase the contact area between the liquid in the liquid storage shell (6) and the air.

9. The oilfield wellhead petroleum casing cutting device according to claim 3, characterized in that: The invention also includes a symmetrically distributed protection mechanism, which is arranged on the first sliding plate (106) and is used to release the cooperation between the first ratchet (205) and the second ratchet (302). The protection mechanism includes an L-shaped rod (7), which is fixed to the first sliding plate (106), and the L-shaped rod (7) penetrates the second sliding plate (109) and the first fixed plate (104) and is slidably connected to the two. The first sliding frame (301) is fixed with a second fixed block (701) that cooperates with the L-shaped rod (7), and the side of the second fixed block (701) that contacts the L-shaped rod (7) is set to be inclined. The second fixed plate (3) is limited to slide with a sliding rod (702), and the sliding rod (702) is limited to cooperate with the second fixed block (701), and a tension spring (703) is installed between the sliding rod (702) and the second fixed plate (3).

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