Tubing cutting device in pressure chamber under pressure and tubing cutting and pulling-out process

Abstract

The present application relates to a tubing cutting device in a pressure chamber under pressure operation and a tubing cutting and pulling-out process, which solves the problems of high construction difficulty, low efficiency, high cost and low cutting reliability of the existing cutting device. The present application cuts the pipe column to be cut located in the vertical chamber through two cutting units arranged at both ends of the blade stagnation chamber, each cutting unit comprising a driving assembly, an advancing assembly and a blade head assembly, wherein the driving assembly is used to provide power for the blade head assembly, and the advancing assembly is used to drive the blade head assembly to move and cut the pipe column to be cut located in the vertical chamber. The hydraulic drive device of the driving assembly drives the transmission connecting piece to rotate, and the transmission butt joint of the blade head assembly is in transmission connection and relative sliding with the transmission connecting piece. The transmission butt joint is connected with the input end of the gear transmission assembly, and the disc blade is connected with the output end. In this way, the power can be transmitted to the disc blade through the gear transmission assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to a tubing cutting device, in particular to a tubing cutting device in a pressure chamber of a snubbing operation and a process for cutting and pulling out a tubing. BACKGROUND

[0002] During the process of pulling up the tubing string in the snubbing operation, if the tubing, drill pipe or downhole tool is stuck in the well, the well needs to be temporarily shut in for a long period of time. However, the annular preventer cannot be shut in for a long time, and the full-enclosed ram preventer cannot be shut in either because of the pipe string inside. Therefore, the pipe string needs to be cut off below the full-enclosed ram preventer, the upper cut-off pipe string is taken out, and the passage of the full-enclosed ram preventer is left open to facilitate the full-enclosed shut-in of the full-enclosed ram preventer. In the full-enclosed and full-process snubbing operation of oil, water and gas wells, because some tool strings have bypass passages in the inner and outer cavities (such as water distributor tool strings), the bypass passages have controllable valve members to be closed or passed through, but if the valve members fail, the inner cavity of the tool string and the annulus in the well may be in a through state, and the fluid in the tool string communicates with the annulus in the well. When the tool string is pulled out of the annular preventer on the upper part of the pressure chamber of the snubbing operation equipment, the bypass passage will spray the high-pressure fluid in the tool string, resulting in the failure to implement the full-enclosed snubbing operation. In order to achieve the full-enclosed snubbing operation, the tool string below the bypass passage of the tool string needs to be cut off below the full-enclosed ram preventer of the pressure chamber, the upper pipe string is controllably taken out, and then the full-enclosed ram preventer is closed. Then, a special lifting sub is used to controllably lower into the annular preventer through the lifting device, the full-enclosed ram preventer is opened, the lower tool string is connected by the lifting sub, and the lifting work is continued, thereby avoiding the high-pressure fluid from being sprayed from the bypass passage after the bypass passage is directly pulled out of the annular preventer.

[0003] Before the snubbing operation of some oil, water and gas wells, the pipe string needs to be put into a plug. However, because the plug seat sealing position is difficult to determine or difficult to put into the lowermost part of the pipe string, when the pipe string is pulled out under pressure, the fluid pressure in the pipe string above the plug is zero at the uppermost part, and when the pipe string above the plug is pulled out, well blowout basically does not occur in the pipe string. However, when the remaining pipe string below the plug is taken out, well blowout occurs. If the snubbing operation equipment is equipped with a function component that can make up or break out the thread in the pressure chamber, the pipe string below the plug can be made up or broken out in the pressure chamber, and then the remaining pipe string is taken out by using a special lifting sub. However, sometimes the pipe string connection thread is rusted and cannot be disassembled. At this time, the pipe string needs to be cut off below the full-enclosed ram preventer, the upper pipe string is taken out, and then the lifting sub is controllably lowered into the pressure chamber, the lower pipe string is connected, and then the remaining pipe string is pulled out under pressure.

[0004] To cut tubing strings, three types of cutting devices are commonly used. The first is a mechanical cutting blade, where the blade head needs to be lowered into the well into the upper part of the tubing using a small-diameter rod-shaped extension rod under pressure. After the blade head is lowered to the cutting position, the small-diameter extension rod of the blade is rotated to allow the blade head to rotate and feed along the radial direction of the tubing string, slowly cutting it off. However, this cutting method is difficult to implement, inefficient, and unreliable. The second type is an in-tubing electric cutting tool. This tool needs to be lowered into the well using a cable-connected assembly outside the tubing. This tool string structure is quite complex, and it places high demands on the performance and reliability of the electric cutting tool. The result of the cutting is difficult to judge, and the electric cutting tool also requires an external control system, resulting in higher costs and the inability to operate under pressure. The third type is the annular external cutting device. This device is driven by a hydraulic drive, but it uses a pair of individual cutting rod-shaped cutters. The cutter and the built-in ring gear drive rotating parts are set around the outside of the pipe string to be cut. Once the guide rod of the rod-shaped cutter breaks or is damaged, it cannot be replaced during construction. Moreover, the radial movement of the rod-shaped cutter is driven by the hydraulic piston in the hydraulic drive, but the amount of movement of the piston rod of the hydraulic piston cannot be controlled, and it is impossible to determine whether both guide rods are engaged in the work. The reliability of cutting is low. Once the cutter rod breaks and falls into the well, it will cause a stuck drill accident. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of existing cutting devices, such as high construction difficulty, low efficiency, high cost and low cutting reliability, and to provide a pressure chamber oil pipe cutting device and oil pipe cutting and removal process for pressurized operation.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] A pressure chamber oil pipe cutting device for live operation, characterized by:

[0008] Includes a housing and two cutting units;

[0009] The housing has a vertical cavity extending vertically and a blade stagnation cavity extending horizontally. The axes of the vertical cavity and the blade stagnation cavity intersect and are perpendicular to each other. The vertical cavity is used for the passage of the tube to be cut.

[0010] Two cutting units are positioned opposite each other at both ends of the blade stall chamber. Each cutting unit includes a drive assembly, a feed assembly, and a cutter head assembly.

[0011] The driving assembly comprises a cylinder, a hydraulic driving device and a transmission connecting piece, one side of the cylinder is connected to the shell and corresponds to the blade stagnation cavity, the other side is provided with a gland, the hydraulic driving device is connected to the gland, and the output end of the hydraulic driving device is located in the cylinder, and the transmission connecting piece is connected with the output end of the hydraulic driving device;

[0012] The feed assembly comprises a floating sliding disc and a disc blade feed and retreat feed amount device, the floating sliding disc is slidingly installed in the cylinder and is arranged close to one side of the shell, and the disc blade feed and retreat feed amount device is installed on the gland and has an output end extending into the cylinder and connected with the floating sliding disc for driving the floating sliding disc to slide in the cylinder.

[0013] The tool head assembly comprises a tool head shell, a disc blade, a gear transmission assembly and a transmission butt joint piece, the tool head shell is located in the blade stagnation cavity and connected with the outer side of the floating sliding disc, the gear transmission assembly is arranged in the tool head shell and has an output end connected with the disc blade, the axis of the disc blade is parallel to the axis of the vertical cavity, the input end of the gear transmission assembly is connected with the transmission butt joint piece, and the transmission butt joint piece is in transmission connection with the transmission connecting piece and can slide relatively.

[0014] Further, the transmission connecting piece is a spline shaft sleeve, the transmission butt joint piece is a spline shaft, the spline shaft sleeve is internally provided with a spline hole matched with the outer wall of the spline shaft, and the spline shaft is located in the spline hole.

[0015] Further, the disc blade feed and retreat feed amount device comprises a hand wheel, a lead screw and a limiting sleeve.

[0016] The lead screw comprises a screw rod section and a sealing shaft section which are coaxially connected in sequence, the screw rod section is threadedly connected with the floating sliding disc, the sealing shaft section is rotatably installed on the gland and has one end extending out of the cylinder, the limiting sleeve is located outside the cylinder and is sleeved on the sealing shaft section, one end of the limiting sleeve abuts against the outer side wall of the gland, and the hand wheel is installed on the outer end of the sealing shaft section and abuts against the other end of the limiting sleeve.

[0017] Further, the disc blade feed and retreat feed amount device further comprises a guide rod.

[0018] The axis of the guide rod is parallel to the axis of the lead screw, one end of the guide rod is connected to the floating sliding disc, a guide hole is formed in the gland, and the other end of the guide rod penetrates through the guide hole.

[0019] Further, a feed and retreat amount scale line is arranged on the outer wall of the guide rod.

[0020] Further, the gear transmission assembly comprises a small bevel gear, a large bevel gear, a large straight gear, a small straight gear, a first transmission shaft and a second transmission shaft.

[0021] The outer wall of the tool head shell is provided with a rotating connecting disc, one end of the spline shaft is provided with a mounting shaft section, and the mounting shaft section is in rotating connection with the rotating connecting disc and extends into the tool head shell;

[0022] The small bevel gear is fixed on the mounting shaft section, the large bevel gear is fixed on the first transmission shaft and is in meshing connection with the small bevel gear, the large spur gear is fixed on the first transmission shaft, the axis of the first transmission shaft is perpendicular to the axis of the spline shaft, and the first transmission shaft is in rotating connection in the tool head shell;

[0023] The small spur gear is fixed on the second transmission shaft and is in meshing connection with the large spur gear, the second transmission shaft is arranged in parallel with the first transmission shaft and is in rotating connection in the tool head shell, and one end of the second transmission shaft extends out of the tool head shell and is connected with the disc cutter.

[0024] Further, the end of the second transmission shaft extending out of the tool head shell is provided with a threaded section near the end position;

[0025] The second transmission shaft is provided with an upper pressing disc and a lower pressing disc, both of which are in abutment with two sides of the disc cutter, and the threaded section is provided with a locking nut in rotation, and the locking nut is in abutment with the lower pressing disc.

[0026] Further, the cylinder is a hollow structure, one side of which is connected to the shell through bolts, and the other side is connected to the gland through bolts;

[0027] The spline shaft sleeve and the gland are in rotating connection through bearings;

[0028] The sealing shaft section is in rotating installation on the gland through bearings.

[0029] Meanwhile, the application also provides a cutting and pulling out process for oil pipes, which adopts the above-mentioned oil pipe cutting device in a pressure operation pressure chamber, a safety blowout preventer group, a transition connecting disc, a double-gate blowout preventer, a semi-seal blowout preventer, a lifting chamber, a full-seal gate blowout preventer, an annular blowout preventer, a pressure operation function component combination fixing frame assembly and a hydraulic lifting movable assembly; the special feature thereof lies in comprising the following steps:

[0030] S1, the safety blowout preventer group, the transition connecting disc, the double-gate blowout preventer, the semi-seal blowout preventer, the lifting chamber, the oil pipe cutting device in the pressure operation pressure chamber, the full-seal gate blowout preventer and the annular blowout preventer are sequentially connected from bottom to top to form a pressure operation fixed blowout preventer group, the transition connecting disc is connected with the bottom end of the pressure operation function component combination fixing frame assembly, the hydraulic lifting movable assembly is installed at the top end of the pressure operation function component combination fixing frame assembly, and finally the safety blowout preventer group is connected with the wellhead casing flange arranged at the wellhead position of the oil-water-gas well;

[0031] S2, start the hydraulic lifting traveling assembly, the lifting short section of the hydraulic lifting traveling assembly moves downward through the whole pressure operation fixed blowout preventer group, and then the oil-water gas well inside the oil-water gas well below the casing flange is grabbed, and then the cutting pipe column is lifted to the cutting position, and the safety blowout preventer group, the double-gate blowout preventer and the semi-sealing blowout preventer of the pressure operation fixed blowout preventer group are clamped to the cutting pipe column;

[0032] S3, start the hydraulic drive device of one of the cutting units, and the output end of the hydraulic drive device drives the transmission connecting piece, the transmission butt joint, the gear transmission assembly and the disc cutter in turn;

[0033] S4, start the corresponding disc cutter advance and retreat cutter feed amount device, the output end of the disc cutter advance and retreat cutter feed amount device drives the floating sliding disc to move in the vertical cavity direction, and with the movement of the floating sliding disc, the disc cutter rotates to cut the cutting pipe column in the vertical cavity, until the output end of the disc cutter advance and retreat cutter feed amount device moves to the limit position, and then the disc cutter advance and retreat cutter feed amount device drives the corresponding floating sliding disc to retreat to the reset position;

[0034] S5, start the hydraulic drive device of the other cutting unit, and the output end of the hydraulic drive device drives the transmission connecting piece, the transmission butt joint, the gear transmission assembly and the disc cutter in turn;

[0035] S6, start the corresponding disc cutter advance and retreat cutter feed amount device, the output end of the disc cutter advance and retreat cutter feed amount device drives the floating sliding disc to move in the vertical cavity direction, and with the movement of the floating sliding disc, the disc cutter rotates to cut the cutting pipe column in the vertical cavity, until the output end of the disc cutter advance and retreat cutter feed amount device moves to the limit position, and then the disc cutter advance and retreat cutter feed amount device drives the corresponding floating sliding disc to retreat to the reset position;

[0036] S7, start the hydraulic lifting traveling assembly, and the cut cutting pipe column is lifted until the lower end port exceeds the upper part of the gate of the full-sealing gate blowout preventer, and then the full-sealing gate blowout preventer is closed, and then the cut cutting pipe column is lifted out by using the hydraulic lifting traveling assembly;

[0037] S8, start the hydraulic lifting traveling assembly, lower the lifting short section with it into the annular blowout preventer cavity in the annular blowout preventer, close the annular blowout preventer, open the full seal ram blowout preventer, continue to fall the lifting short section, until the lifting short section holds the remaining to be cut pipe column, loosen the safety blowout preventer group, the double ram blowout preventer and the slip ram of the half seal blowout preventer group of the pressure operation fixed blowout preventer group, the hydraulic lifting traveling assembly drives the remaining to be cut pipe column to move upwards, until the lower end exceeds the upper part of the ram of the full seal ram blowout preventer, then close the full seal ram blowout preventer, use the hydraulic lifting traveling assembly to lift the remaining to be cut pipe column out, complete the cutting off pipe tripping process.

[0038] Further, the step S4 is specifically:

[0039] The hand wheel is rotated, the hand wheel drives the screw rod to rotate, the screw rod segment of the screw rod drives the floating sliding disc to move towards the vertical cavity direction, with the movement of the floating sliding disc, the circular disc cutter rotates and cuts the to-be-cut pipe column located in the vertical cavity, until the screw rod segment moves to the limit position, then the hand wheel is reversely rotated, the screw rod drives the corresponding floating sliding disc to retreat to the reset position;

[0040] The step S6 is specifically:

[0041] The hand wheel is rotated, the hand wheel drives the screw rod to rotate, the screw rod segment of the screw rod drives the floating sliding disc to move towards the vertical cavity direction, with the movement of the floating sliding disc, the circular disc cutter rotates and cuts the to-be-cut pipe column located in the vertical cavity, until the screw rod segment moves to the limit position, then the hand wheel is reversely rotated, the screw rod drives the corresponding floating sliding disc to retreat to the reset position.

[0042] Compared with the prior art, the beneficial effects of the present application are:

[0043] (1) The oil pipe cutting device in the pressure operation pressure chamber provided by the present application cuts the to-be-cut pipe column located in the vertical cavity through two cutting units arranged at the two ends of the cutter stagnation cavity, each cutting unit includes a driving assembly, an infeed assembly and a cutter head assembly, wherein the driving assembly is used to provide power for the cutter head assembly, the infeed assembly is used to drive the cutter head assembly to move and cut the to-be-cut pipe column located in the vertical cavity, the hydraulic drive device of the driving assembly drives the transmission connecting piece to rotate, the transmission butt joint of the cutter head assembly is in transmission connection with the transmission connecting piece and can slide relative to the transmission connecting piece, the transmission butt joint is connected with the input end of the gear transmission assembly, and the circular disc cutter is connected with the output end, so that the power can be transmitted to the circular disc cutter through the gear transmission assembly, and when the infeed assembly circular disc cutter infeed amount device drives the floating sliding disc to move, the power of the hydraulic drive device can still be transmitted to the cutter head assembly, the whole cutting device does not use electric control, the cost is reduced, the construction difficulty is reduced, two cutting units are adopted, the two cutting units work in turn, the cutting success rate is improved, and the efficiency is improved.

[0044] (2) The cutting device for oil pipe in pressure cavity of pressure operation provided by the application adopts a disc blade, which is not easy to break and is subjected to uniform force during cutting, the disc blade can rotate at high speed, the cutting efficiency is high, and the disc blade can cut hollow pipe columns and tool strings similar to solid ones, meeting the need of multiple cutting.

[0045] (3) The feed assembly of the cutting device for oil pipe in pressure cavity of pressure operation further comprises a guide rod, the axis of the guide rod is parallel to the axis of the screw rod, one end of the guide rod is connected to the floating sliding disc, a guide hole is formed in the side wall of the cylinder which is rotatably installed on the sealing shaft section, the other end of the guide rod penetrates out of the guide hole, and a feed and retreat amount scale line is arranged on the outer wall of the guide rod, so that the movement amount of the floating sliding disc and the movement amount of the disc blade can be clearly known through the feed and retreat amount scale line, and the operator can conveniently observe.

[0046] (4) The transmission connecting piece in the cutting device for oil pipe in pressure cavity of pressure operation is a spline shaft sleeve, the transmission butt joint piece is a spline shaft, a spline hole which is matched with the outer wall of the spline shaft is formed in the interior of the spline shaft sleeve, and the spline shaft is located in the spline hole, so that the two can not only transmit rotary power, but also can slide relative to each other, the movement requirement of the floating sliding disc is met, the overall structure is simple, and maintenance is easy. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 is a sectional view of an embodiment of the cutting device for oil pipe in pressure cavity of pressure operation Figure 1 (along the vertical cavity axial direction and the blade stagnation cavity axial direction);

[0048] Figure 2 is a sectional view of Figure 1 is a sectional view of is a sectional view of

[0049] Figure 3 is a sectional view of an embodiment of the cutting device for oil pipe in pressure cavity of pressure operation Figure 2 (along the vertical cavity radial direction and the blade stagnation cavity axial direction, the right disc blade is not shown);

[0050] Figure 4 is a perspective structural schematic view of the cutting unit in the embodiment of the cutting device for oil pipe in pressure cavity of pressure operation (the tool head assembly is not shown);

[0051] Figure 5 is a sectional view of Figure 4 is a sectional view of

[0052] Figure 6 is a perspective structural schematic view of the tool head assembly in the embodiment of the cutting device for oil pipe in pressure cavity of pressure operation;

[0053] Figure 7 The side view of the cutter head assembly in the embodiment of the cutting device for oil pipe in the pressure chamber of the under-pressure operation of the application;

[0054] Figure 8 The sectional view of the cutter head assembly in the embodiment of the cutting device for oil pipe in the pressure chamber of the under-pressure operation of the application;

[0055] Figure 9 The structure diagram of the fixed blowout preventer group in the under-pressure operation in the process of cutting and pulling out the oil pipe of the application;

[0056] Figure 10 The structure diagram of the hydraulic lifting movable assembly lowering the lifting nipple from the annular blowout preventer in the step S8 of the process of cutting and pulling out the oil pipe of the application.

[0057] The reference signs are explained as follows:

[0058] 01-the cutting device for oil pipe in the pressure chamber of the under-pressure operation, 02-the wellhead casing flange, 03-the safety blowout preventer group, 04-the transition connecting disc, 05-the double-gate blowout preventer, 06-the semi-sealing blowout preventer, 07-the lifting chamber, 08-the full-sealing gate blowout preventer, 09-the annular blowout preventer, 010-the pipe column to be cut, 011-the fixed rack assembly of the under-pressure operation function component combination, 012-the hydraulic lifting movable assembly;

[0059] 1-the shell, 11-the vertical chamber, 111-the flange; 12-the blade stagnation chamber;

[0060] 2-the driving assembly, 21-the cylinder, 22-the gland, 23-the hydraulic driving device, 24-the spline shaft sleeve;

[0061] 3-the feeding assembly, 31-the floating sliding disc, 32-the lead screw, 321-the screw rod section, 322-the sealing shaft section; 33-the hand wheel, 34-the limiting sleeve, 35-the guide rod;

[0062] 4-the cutter head assembly, 41-the cutter head shell, 411-the rotating connecting disc; 42-the disc blade, 43-the small bevel gear, 44-the large bevel gear, 45-the large spur gear, 46-the small spur gear, 47-the first transmission shaft, 48-the second transmission shaft, 49-the upper pressing disc, 410-the lower pressing disc, 412-the spline shaft, 4121-the mounting shaft section; 413-the locking nut. DETAILED DESCRIPTION

[0063] The application will be further explained in combination with the drawings and exemplary embodiments.

[0064] Reference Figures 1-8The cutting device for oil pipe in pressure cavity with pressure operation comprises a shell 1 and two cutting units, the shell 1 is provided with a vertical cavity 11 through the shell 1 along the vertical direction, the vertical cavity 11 is used for the pipe column 010 to be cut through, flanges 111 are arranged at both ends of the vertical cavity 11, and the flanges 111 are used for being connected with other components. A blade stagnation cavity 12 is provided through the shell 1 along the horizontal direction, the axis of the vertical cavity 11 intersects with the axis of the blade stagnation cavity 12 and is perpendicular to each other. The through diameter of the vertical cavity 11 has various specifications, and the through diameter can be determined according to the actual working condition. The disc cutter 42 in the cutting unit also has various specifications, and the disc cutter 42 can be matched with the disc cutter 42 of different specifications according to the through diameter of the vertical cavity 11. Similarly, the specification of the blade stagnation cavity 12 is determined according to the through diameter of the vertical cavity 11 and the specification of the disc cutter 42.

[0065] The two cutting units are oppositely arranged at both ends of the blade stagnation cavity 12, each cutting unit comprises a driving assembly 2, an advancing assembly 3 and a cutter head assembly 4, the driving assembly 2 comprises a cylinder 21, a hydraulic driving device 23 and a transmission connecting piece, the cylinder 21 is a hollow structure, one side of the cylinder 21 is connected to the shell 1 through bolts and corresponds to the blade stagnation cavity 12, the other side of the cylinder 21 is connected with a gland 22 through bolts, and the hydraulic driving device 23 is connected to the gland 22. In this embodiment, the hydraulic driving device 23 is a hydraulic motor. The output end of the hydraulic driving device 23 extends into the cylinder 21, and the transmission connecting piece is connected to the output end of the hydraulic driving device 23. In this embodiment, the transmission connecting piece is a spline shaft sleeve 24.

[0066] The advancing assembly 3 comprises a floating sliding disc 31 and a disc cutter advancing and retreating cutter feed amount device, the floating sliding disc 31 is slidingly installed inside the cylinder 21 and is arranged close to the shell 1 side, and the disc cutter advancing and retreating cutter feed amount device is installed on the gland 22. The output end of the disc cutter advancing and retreating cutter feed amount device extends into the cylinder 21 and is connected with the floating sliding disc 31, for driving the floating sliding disc 31 to slide in the cylinder 21. The disc cutter advancing and retreating cutter feed amount device can be driven by hydraulic pressure or manually. If driven by hydraulic pressure, it is a hydraulic cylinder. In this embodiment, it is manually driven. The disc cutter advancing and retreating cutter feed amount device comprises a lead screw 32, a hand wheel 33, a limiting sleeve 34 and a guide rod 35. The lead screw 32 comprises a screw rod segment 321 and a sealing shaft segment 322 which are coaxially connected in sequence. The screw rod segment 321 is threadedly connected with the floating sliding disc 31. The sealing shaft segment 322 is rotatably installed on the gland 22 and extends out of the cylinder 21 at one end. The limiting sleeve 34 is located outside the cylinder 21 and is sleeved on the sealing shaft segment 322. One end of the limiting sleeve 34 abuts against the outer side wall of the gland 22. The hand wheel 33 is installed on the outer end of the sealing shaft segment 322, and the hand wheel 33 abuts against the other end of the limiting sleeve 34.

[0067] The axis of the guide rod 35 is parallel to the axis of the screw rod 32, one end of the guide rod 35 is connected to the floating sliding disc 31 through a threaded hole provided on the floating sliding disc 31, and a guide hole is provided on the gland 22, the other end of the guide rod 35 passes through the guide hole, and a feed-removal amount scale line is provided on the outer wall of the guide rod 35, so that when the floating sliding disc 31 moves, the guide rod 35 moves synchronously, and the operator can know the movement amount of the floating sliding disc 31 according to the feed-removal amount scale line thereon.

[0068] Because the inside of the shell 1 is a high-pressure environment, the cylinder 21 and the shell 1, and the cylinder 21 and the gland 22 are sealed by sealing members. The spline shaft sleeve 24 is rotatably connected to the gland 22 by a bearing, which provides support for the spline shaft sleeve 24, and a sealing ring is provided between the spline shaft sleeve 24 and the gland 22. The sealed shaft section 322 of the screw rod 32 is also rotatably mounted on the gland 22 by a bearing, and a sealing ring is provided between the sealed shaft section 322 and the gland 22 to ensure the sealing of the inside of the cylinder 21, and a sealing ring is also provided in the guide hole through which the guide rod 35 passes to ensure sealing.

[0069] The tool head assembly 4 includes a tool head shell 41, a disc cutter 42, a gear transmission assembly, and a transmission connecting piece. The tool head shell 41 is located in the cutter stagnation cavity 12 and connected to the outer side of the floating sliding disc 31. The gear transmission assembly is provided in the tool head shell 41, and the output end is connected to the disc cutter 42, and the input end is connected to the transmission connecting piece. Because the disc cutter 42 needs to cut along the radial direction of the pipe column 010 to be cut, the axis of the disc cutter 42 is parallel to the axis of the vertical cavity 11. Because the tool head assembly 4 needs to move with the floating sliding disc 31, the transmission connecting piece and the transmission connecting piece not only need to be transmission connected, but also need to slide relative to each other. In this embodiment, the transmission connecting piece is a spline shaft 412, a spline hole matched with the outer wall of the spline shaft 412 is provided in the spline shaft sleeve 24, and the spline shaft 412 is located in the spline hole. The spline on the outer wall of the spline shaft 412 and the spline hole can complete power transmission, and the spline shaft 412 can slide in the spline hole in the axial direction, so that not only the transmission connection is met, but also the relative sliding is met.

[0070] A rotating connecting disc 411 is arranged on the outer wall of the tool head shell 41, and one end of the spline shaft 412 is provided with a mounting shaft segment 4121 which is in rotating connection with the rotating connecting disc 411 and extends into the tool head shell 41; the gear transmission assembly comprises a small bevel gear 43, a large bevel gear 44, a large spur gear 45, a small spur gear 46, a first transmission shaft 47 and a second transmission shaft 48; the small bevel gear 43 is fixedly sleeved on the mounting shaft segment 4121, the axis of the first transmission shaft 47 is perpendicular to the axis of the spline shaft 412 and is in rotating connection inside the tool head shell 41, the large bevel gear 44 is fixedly sleeved on the first transmission shaft 47 and is in meshing with the small bevel gear 43, the reversing is completed by the cooperation of the large bevel gear 44 and the small bevel gear 43, and the large spur gear 45 is also fixedly sleeved on the first transmission shaft 47.

[0071] The second transmission shaft 48 is arranged in parallel with the first transmission shaft 47 and is in rotating connection inside the tool head shell 41, the small spur gear 46 is fixedly sleeved on the second transmission shaft 48 and is in meshing with the large spur gear 45, and one end of the second transmission shaft 48 extends out of the tool head shell 41 and is connected with the disc cutter 42; the meshing of the large spur gear 45 and the small spur gear 46 amplifies the rotating speed and transmits the power to the second transmission shaft 48.

[0072] In order to fix the disc cutter 42, a threaded segment is arranged on the position close to the end of the one end of the second transmission shaft 48 extending out of the tool head shell 41, an upper pressing disc 49 and a lower pressing disc 410 are sleeved on the second transmission shaft 48, and the two are respectively in abutment with the two sides of the disc cutter 42, a locking nut 413 is screwed on the threaded segment, and the locking nut 413 is in abutment with the lower pressing disc 410.

[0073] Meanwhile, the application also provides a cutting and pulling out process for oil pipes, which adopts the above-mentioned oil pipe cutting device 01 in a pressure operation pressure cavity, and a safety blowout preventer group 03, a transition connecting disc 04, a double-gate blowout preventer 05, a half-seal blowout preventer 06, a lifting cavity 07, a full-seal gate blowout preventer 08, an annular blowout preventer 09, a pressure operation function component combination assembly fixing frame assembly 011 and a hydraulic lifting movable assembly 012; the process comprises the following steps:

[0074] S1, the safety blowout preventer group 03, the transition connecting disc 04, the double-gate blowout preventer 05, the half-seal blowout preventer 06, the lifting cavity 07, the oil pipe cutting device 01 in the pressure operation pressure cavity, the full-seal gate blowout preventer 08 and the annular blowout preventer 09 are sequentially connected from bottom to top to form a pressure operation fixed blowout preventer group, the transition connecting disc 04 is connected with the bottom end of the pressure operation function component combination assembly fixing frame assembly 011, the hydraulic lifting movable assembly 012 is installed at the top end of the pressure operation function component combination assembly fixing frame assembly 011, and finally the safety blowout preventer group 03 is connected with the wellhead casing flange 02 arranged at the wellhead position of the oil-water-gas well.

[0075] The structure of the fixed blowout preventer set for pressure operation is shown in Figure 9

[0076] S2, the hydraulic lifting traveling assembly 012 is started, the lifting short section is moved downward through the whole fixed blowout preventer set for pressure operation, the to-be-cut pipe column 010 in the oil-water gas well below the wellhead casing flange 02 is grabbed, and then the to-be-cut pipe column 010 is lifted to the cutting position, the slips of the safety blowout preventer set 03, the double-gate blowout preventer 05 and the semi-sealing blowout preventer 06 of the fixed blowout preventer set for pressure operation clamp the to-be-cut pipe column 010;

[0077] S3, the hydraulic drive device 23 of one cutting unit is started, the output end of the hydraulic drive device 23 drives the transmission connecting piece, the transmission butt joint, the gear transmission assembly and the disc cutter 42 in turn to rotate;

[0078] S4, the disc cutter advance and retreat cutter feed amount device is started, the output end of the disc cutter advance and retreat cutter feed amount device drives the floating sliding disc 31 to move towards the vertical cavity 11, with the movement of the floating sliding disc 31, the disc cutter 42 rotates to cut the to-be-cut pipe column 010 in the vertical cavity 11, until the output end of the disc cutter advance and retreat cutter feed amount device moves to the limit position, and then the disc cutter advance and retreat cutter feed amount device drives the corresponding floating sliding disc 31 to retreat to the reset position;

[0079] Step S4 is specifically:

[0080] The hand wheel 33 is rotated, the hand wheel 33 drives the screw rod 32 to rotate, the screw rod segment 321 of the screw rod 32 drives the floating sliding disc 31 to move towards the vertical cavity 11, with the movement of the floating sliding disc 31, the disc cutter 42 rotates to cut the to-be-cut pipe column 010 in the vertical cavity 11, until the screw rod segment 321 moves to the limit position, and then the hand wheel 33 is reversely rotated, the screw rod 32 drives the corresponding floating sliding disc 31 to retreat to the reset position;

[0081] S5, the hydraulic drive device 23 of the other cutting unit is started, the output end of the hydraulic drive device 23 drives the transmission connecting piece, the transmission butt joint, the gear transmission assembly and the disc cutter 42 in turn to rotate;

[0082] S6, the disc cutter advance and retreat cutter feed amount device is started, the output end of the disc cutter advance and retreat cutter feed amount device drives the floating sliding disc 31 to move towards the vertical cavity 11, with the movement of the floating sliding disc 31, the disc cutter 42 rotates to cut the to-be-cut pipe column 010 in the vertical cavity 11, until the output end of the disc cutter advance and retreat cutter feed amount device moves to the limit position, the to-be-cut pipe column 010 is cut off, and then the disc cutter advance and retreat cutter feed amount device drives the corresponding floating sliding disc 31 to retreat to the reset position;

[0083] ​Step S6 is specifically:

[0084] Rotating the hand wheel 33, the hand wheel 33 drives the screw rod 32 to rotate, the screw rod segment 321 of the screw rod 32 drives the floating sliding disc 31 to move towards the vertical cavity 11, with the movement of the floating sliding disc 31, the disc cutter 42 rotates to cut the to-be-cut pipe column 010 in the vertical cavity 11, until the screw rod segment 321 moves to the limit position, the to-be-cut pipe column 010 is cut off, then, the hand wheel 33 is reversely rotated, the corresponding floating sliding disc 31 is driven by the screw rod 32 to retreat to the reset position;

[0085] S7, starting the hydraulic lifting traveling assembly 012, the cut-off to-be-cut pipe column 010 is lifted upwards until the lower end port thereof exceeds the upper part of the gate of the full seal gate preventer 08, the full seal gate preventer 08 is closed, then the cut-off to-be-cut pipe column 010 is continuously lifted out by using the hydraulic lifting traveling assembly 012;

[0086] S8, starting the hydraulic lifting traveling assembly 012, the lifting short section carried by the hydraulic lifting traveling assembly 012 is lowered into the annular blowout preventer cavity in the annular preventer 09, the annular preventer 09 is closed, the full seal gate preventer 08 is opened, the lifting short section continues to fall until the lifting short section clamps the remaining to-be-cut pipe column 010, the slips gate of the safety preventer group 03, the double gate preventer 05 and the semi-seal preventer 06 of the pressure operation fixed preventer group are loosened, the hydraulic lifting traveling assembly 012 drives the remaining to-be-cut pipe column 010 to move upwards until the lower end port thereof exceeds the upper part of the gate of the full seal gate preventer 08; then the full seal gate preventer 08 is closed, the remaining to-be-cut pipe column 010 is lifted out by using the hydraulic lifting traveling assembly 012, and the cutting pipe lifting-out process is completed.

[0087] Wherein, the structure diagram when the hydraulic lifting traveling assembly 012 lowers the lifting short section carried by the hydraulic lifting traveling assembly 012 into the annular preventer 09 is as shown in Figure 10 .

[0088] The above-described embodiments are merely descriptions of specific implementation manners of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application defined by the claims.

Claims

1. A tubing cutting device in a pressure chamber operating under pressure, characterized in that: it comprises a shell (1) and two cutting units; the shell (1) is provided with a vertical cavity (11) through the shell (1) along the vertical direction and a blade stop cavity (12) through the shell (1) along the horizontal direction, the axis of the vertical cavity (11) intersects and is perpendicular to the axis of the blade stop cavity (12), and the vertical cavity (11) is used for the passage of a pipe column (010) to be cut; the two cutting units are oppositely arranged at the two ends of the blade stop cavity (12), and each cutting unit comprises a driving assembly (2), an advancing assembly (3) and a cutter head assembly (4); the driving assembly (2) comprises a cylinder (21), a hydraulic drive device (23) and a transmission connecting piece, one side of the cylinder (21) is connected to the shell (1) and corresponds to the blade stop cavity (12), the other side is provided with a gland (22), the hydraulic drive device (23) is connected to the gland (22), and the output end of the hydraulic drive device (23) is located in the cylinder (21), and the transmission connecting piece is connected with the output end of the hydraulic drive device (23); the advancing assembly (3) comprises a floating sliding disc (31) and a disc blade advancing and retracting advancing amount device, the floating sliding disc (31) is slidingly installed in the cylinder (21) and arranged close to the shell (1) side, and the disc blade advancing and retracting advancing amount device is installed on the gland (22), the output end of the disc blade advancing and retracting advancing amount device extends into the cylinder (21) and is connected with the floating sliding disc (31), and the disc blade advancing and retracting advancing amount device is used to drive the floating sliding disc (31) to slide in the cylinder (21); the cutter head assembly (4) comprises a cutter head shell (41), a disc blade (42), a gear transmission assembly and a transmission butt joint piece; the cutter head shell (41) is located in the blade stop cavity (12) and connected with the outer side of the floating sliding disc (31), the gear transmission assembly is arranged in the cutter head shell (41) and the output end of the gear transmission assembly is connected with the disc blade (42), the axis of the disc blade (42) is parallel to the axis of the vertical cavity (11), the input end of the gear transmission assembly is connected with the transmission butt joint piece, and the transmission butt joint piece is in transmission connection with the transmission connecting piece and can slide relatively; the transmission connecting piece is a spline shaft sleeve (24), the transmission butt joint piece is a spline shaft (412), the spline shaft sleeve (24) is internally provided with a spline hole matched with the outer wall of the spline shaft (412), and the spline shaft (412) is located in the spline hole; the gear transmission assembly comprises a small bevel gear (43), a large bevel gear (44), a large spur gear (45), a small spur gear (46), a first transmission shaft (47) and a second transmission shaft (48); the outer wall of the cutter head shell (41) is provided with a rotating connection disc (411), one end of the spline shaft (412) is provided with a mounting shaft section (4121), and the mounting shaft section (4121) is in rotating connection with the rotating connection disc (411) and extends into the cutter head shell (41). ​ ​ ​ ​ ​ ​ ​ ​ ​ The small bevel gear (43) is fixedly sleeved on the mounting shaft section (4121), the large bevel gear (44) is fixedly sleeved on the first transmission shaft (47) and is engaged with the small bevel gear (43), the large spur gear (45) is fixedly sleeved on the first transmission shaft (47), the axis of the first transmission shaft (47) is perpendicular to the axis of the spline shaft (412), and the first transmission shaft (47) is rotationally connected in the tool head shell (41); The small spur gear (46) is fixedly sleeved on the second transmission shaft (48) and is engaged with the large spur gear (45), the second transmission shaft (48) is arranged in parallel with the first transmission shaft (47) and is rotationally connected in the tool head shell (41), one end of the second transmission shaft (48) is arranged to be connected with the disc cutter (42) and the tool head shell (41) is arranged to be connected with the disc cutter (42).

2. The tubing cutting device in pressure cavity under pressure operation according to claim 1, wherein: The disc cutter feeding and withdrawing device comprises a hand wheel (33), a lead screw (32) and a limiting sleeve (34); The lead screw (32) comprises a screw rod section (321) and a sealing shaft section (322) which are coaxially connected in sequence, the screw rod section (321) is threadedly connected with the floating sliding disc (31), the sealing shaft section (322) is rotationally installed on the gland (22) and one end of the sealing shaft section (322) extends out of the cylinder (21), the limiting sleeve (34) is located outside the cylinder (21) and is sleeved on the sealing shaft section (322), one end of the limiting sleeve (34) abuts against the outer side wall of the gland (22), and the hand wheel (33) is installed on the outer end of the sealing shaft section (322) and the hand wheel (33) abuts against the other end of the limiting sleeve (34).

3. The tubing cutting device in pressure cavity under pressure operation according to claim 2, wherein: The disc cutter feeding and withdrawing device further comprises a guide rod (35); The axis of the guide rod (35) is parallel to the axis of the lead screw (32), one end of the guide rod (35) is connected with the floating sliding disc (31), a guide hole is formed in the gland (22), and the other end of the guide rod (35) extends out of the guide hole.

4. The tubing cutting device in pressure cavity under pressure operation according to claim 3, wherein: A feeding and withdrawing scale line is arranged on the outer wall of the guide rod (35).

5. The tubing cutting device in pressure cavity under pressure operation according to claim 1, wherein: One end of the second transmission shaft (48) extending out of the tool head shell (41) is provided with a threaded section near the end position; The second transmission shaft (48) is sleeved with an upper pressing disc (49) and a lower pressing disc (410), the two pressing discs abut against two sides of the disc cutter (42) respectively, the threaded section is rotationally provided with a locking nut (413), and the locking nut (413) abuts against the lower pressing disc (410).

6. The tubing cutting device in pressure cavity under pressure operation according to claim 4, wherein: The cylinder (21) has a hollow structure, one side of the cylinder (21) is connected to the shell (1) through bolts, and the other side of the cylinder (21) is connected to the gland (22) through bolts; The spline shaft sleeve (24) is rotationally connected to the gland (22) through a bearing; The sealing shaft section (322) is rotatably mounted on the gland (22) by a bearing.

7. A tubing cutting and pulling process, using the tubing cutting device (01) in pressure operation pressure chamber as claimed in any one of claims 1-6, and a blowout preventer stack (03), a crossover adapter (04), a double ram preventer (05), a semi-blind preventer (06), a riser chamber (07), a blind ram preventer (08), an annular preventer (09), a pressure operation function components assembly fixture assembly (011) and a hydraulic lifting traveling assembly (012); characterized in that, The method comprises the following steps: S1, sequentially connect the safety blowout preventer group (03), the transition connecting disc (04), the double ram blowout preventer (05), the semi-enclosed blowout preventer (06), the lifting cavity (07), the tubing cutting device in the pressure cavity for snubbing operation (01), the full-enclosed ram blowout preventer (08), and the annular blowout preventer (09) from bottom to top to form a fixed blowout preventer group for snubbing operation, connect the transition connecting disc (04) and the bottom end of the functional component assembly fixing frame assembly (011) for snubbing operation, install the hydraulic lifting traveling assembly (012) at the top end of the functional component assembly fixing frame assembly (011) for snubbing operation, and finally connect the safety blowout preventer group (03) and the wellhead casing flange (02) arranged at the wellhead position of the oil-water-gas well; S2, start the hydraulic lifting traveling assembly (012), the lifting nipple of the hydraulic lifting traveling assembly (012) moves downward through the entire fixed blowout preventer group for snubbing operation, and then clamps the to-be-cut tubular column (010) in the oil-water-gas well at the lower part of the wellhead casing flange (02), then lifts the to-be-cut tubular column (010) to the cutting position, and the slip ram of the safety blowout preventer group (03), the double ram blowout preventer (05), and the semi-enclosed blowout preventer (06) of the fixed blowout preventer group for snubbing operation clamps the to-be-cut tubular column (010); S3, start the hydraulic drive device (23) of one cutting unit, and the output end of the hydraulic drive device (23) drives the transmission connecting piece, the transmission butt joint piece, the gear transmission assembly, and the disc cutter (42) to rotate in sequence; S4, start the corresponding disc cutter feed amount device, the output end of the disc cutter feed amount device drives the floating sliding disc (31) to move towards the vertical cavity (11), with the movement of the floating sliding disc (31), the disc cutter (42) rotates to cut the to-be-cut tubular column (010) in the vertical cavity (11), until the output end of the disc cutter feed amount device moves to the limit position, then the disc cutter feed amount device drives the corresponding floating sliding disc (31) to retreat to the reset position; S5, start the hydraulic drive device (23) of the other cutting unit, and the output end of the hydraulic drive device (23) drives the transmission connecting piece, the transmission butt joint piece, the gear transmission assembly, and the disc cutter (42) to rotate in sequence; S6, start the corresponding disc cutter feed amount device, the output end of the disc cutter feed amount device drives the floating sliding disc (31) to move towards the vertical cavity (11), with the movement of the floating sliding disc (31), the disc cutter (42) rotates to cut the to-be-cut tubular column (010) in the vertical cavity (11), until the output end of the disc cutter feed amount device moves to the limit position, the to-be-cut tubular column (010) is cut off, then the disc cutter feed amount device drives the corresponding floating sliding disc (31) to retreat to the reset position; S7, start the hydraulic lifting and moving assembly (012), and lift the cut-off pipe column (010) until the lower end of the pipe column exceeds the upper part of the gate of the full seal gate preventer (08), close the full seal gate preventer (08), and then continue to lift the cut-off pipe column (010) out of the hydraulic lifting and moving assembly (012); S8, start the hydraulic lifting and moving assembly (012), and lower the lifting nipple of the hydraulic lifting and moving assembly (012) into the annular blowout cavity of the annular preventer (09), close the annular preventer (09), open the full seal gate preventer (08), and continue to lower the lifting nipple until the lifting nipple clamps the remaining pipe column (010), releases the slips of the safety preventer group (03), the double gate preventer (05) and the semi-seal preventer (06) of the pressure operation fixed preventer group, and moves the remaining pipe column (010) upward until the lower end of the pipe column exceeds the upper part of the gate of the full seal gate preventer (08); then close the full seal gate preventer (08), and lift the remaining pipe column (010) out of the hydraulic lifting and moving assembly (012) to complete the cutting and lifting process of the pipe.

8. The cutting and lifting process of the pipe according to claim 7, wherein: Step S4 is specifically: rotate the hand wheel (33), the hand wheel (33) drives the screw rod (32) to rotate, the screw rod segment (321) of the screw rod (32) drives the floating sliding disc (31) to move towards the vertical cavity (11), with the movement of the floating sliding disc (31), the circular disc cutter (42) rotates to cut the pipe column (010) in the vertical cavity (11), until the screw rod segment (321) moves to the limit position, then reverse the hand wheel (33), the screw rod (32) drives the corresponding floating sliding disc (31) to return to the reset position; Step S6 is specifically: rotate the hand wheel (33), the hand wheel (33) drives the screw rod (32) to rotate, the screw rod segment (321) of the screw rod (32) drives the floating sliding disc (31) to move towards the vertical cavity (11), with the movement of the floating sliding disc (31), the circular disc cutter (42) rotates to cut the pipe column (010) in the vertical cavity (11), until the screw rod segment (321) moves to the limit position, the pipe column (010) is cut off, then reverse the hand wheel (33), the screw rod (32) drives the corresponding floating sliding disc (31) to return to the reset position.

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