Experimental method and device for simulating compression-torsion buckling of tubing in wellbore

Abstract

The present invention relates to the technical field of simulation experiment of compression-torsion buckling of tubular column in wellbore, and in particular to a simulation experiment method and experimental device of compression-torsion buckling of tubular column in wellbore, comprising a fixed frame, which is vertically arranged as a whole, and the bottom end is fixedly connected to the ground through a bottom frame; a movable frame, the bottom end of which is hinged to the bottom frame through a hinge seat, so that it can be adjusted between horizontal and vertical, the movable frame comprises an inner tube and an outer sleeve rotatably sleeved outside the inner tube, a straight channel is opened on the tube wall of the inner tube, a spiral channel is opened on the tube wall of the outer sleeve, a slider that can slide along its axial direction is arranged inside the inner tube, a driving shaft is fixed on the side of the slider, and the driving shaft passes through the straight channel and the spiral channel. The present invention allows the experimenter to adjust the experimental angle of the outer tube as needed according to the actual situation, so that the experimenter can obtain the experimental results of tubular column specimens at various inclination angles.

Description

Technical Field

[0001] The invention relates to the technical field of compression-torsion buckling simulation experiment of a tubular column in a wellbore, and in particular to a compression-torsion buckling simulation experiment method and an experiment device for the tubular column in a wellbore. Background Art

[0002] The tubing in the wellbore often buckles due to axial extrusion and torque, which leads to a significant increase in downhole friction and torque, which is not conducive to crude oil production. Therefore, it is of great significance to study the buckling behavior of the tubing in the wellbore.

[0003] For example, the Chinese invention patent application with the announcement number CN106442101A discloses a simulation test device for compression-torsion buckling of tubular columns in a wellbore and its experimental method, wherein the simulation test device for compression-torsion buckling of tubular columns in a wellbore includes an axial pressure loading device, a torque loading device, an outer tube, a static tubular column specimen, a fixed joint, and a load-bearing device, wherein the axial pressure loading device is connected to the torque loading device, the torque loading device is slidably connected to the second base, and the two ends of the static tubular column specimen are connected between the torque loading device and the load-bearing device; the axial pressure loading device has a pressure sensor and a wire sensor, and the torque loading device has a dynamic torque sensor and an angular displacement sensor; the front baffle of the load-bearing device is installed on the small bearing seat through a small bearing, the small bearing seat and the rear baffle are both slidably connected to the guide rail, the static torque sensor is connected to the front baffle, the rear baffle is connected to the pressure sensor, and a large bearing is arranged between the front baffle and the rear baffle. The present invention realizes the simultaneous application and measurement of axial pressure and torque, and the independent measurement of axial pressure and torque at both ends of the tubular column.

[0004] Although the technical solution recorded in the above patent application can achieve certain experimental results, it still has at least the following shortcomings during use:

[0005] The technical solution recorded in the above patent application can only conduct experiments in the horizontal direction. However, in actual production, the tubular string in the wellbore has multiple states such as vertical, inclined, and vertical-inclined, and the inclination angles used in different geologies are also different. It is obviously impossible to meet the current diversified production needs by only conducting horizontal experiments. In addition, the tubular string in the wellbore with different inclination angles has different force magnitudes and directions. The results obtained by only conducting experiments on the tubular string in the wellbore set horizontally are too one-sided. Summary of the invention

[0006] The purpose of the present invention is to provide a method and device for simulating compression-torsion buckling of a tubular column in a wellbore, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a simulation experimental device for compression-torsion buckling of a tubular column in a wellbore, comprising:

[0008] The fixed frame is vertically arranged as a whole, and the bottom end is fixedly connected to the ground through the bottom frame;

[0009] A movable frame, the bottom end of which is hinged to the base frame through a hinge seat so that it can be adjusted between horizontal and vertical, the movable frame comprises an inner tube and an outer sleeve rotatably sleeved outside the inner tube, a straight channel is provided on the tube wall of the inner tube, a spiral channel is provided on the tube wall of the outer sleeve, a slider which can slide along its axial direction is provided inside the inner tube, a driving shaft is fixed on the side of the slider, the driving shaft passes through the straight channel and the spiral channel, and a preset mechanism for adjusting the rotation angle of the outer sleeve relative to the inner tube is also provided on the outer side of the inner tube;

[0010] A mounting frame, which is fixedly connected to the outer sleeve, and a head end detection component and a terminal end detection component are installed on the mounting frame;

[0011] An outer tube is detachably mounted on the front of the mounting frame, a pipe string test piece is arranged inside the outer tube, and the head end detection assembly and the end end detection assembly are respectively arranged at the head and the end of the pipe string test piece;

[0012] A winch, on which the free end of the wound steel wire rope is inserted from the top end of the inner tube and fixedly connected to the slider;

[0013] A torque loader is slidably mounted on the top of the mounting frame, and the sliding direction of the torque loader is parallel to the axial direction of the inner tube; and

[0014] The axial pressure loading cylinder is fixedly mounted on the top of the mounting frame, and the output end of the axial pressure loading cylinder is connected to the torque loading machine.

[0015] Preferably, the preset mechanism comprises a transmission component, a movable sleeve driven by the transmission component to rotate around the inner tube, a circle of a fixed sleeve arranged outside the inner tube, an indicator and a first limit block fixedly connected to the movable sleeve, and a second limit block fixedly connected to the outer sleeve, the outer peripheral surface of the circle is provided with angle scale lines, and the indicator cooperates with the angle scale lines to indicate the rotation angle of the movable sleeve;

[0016] The first limit block and the second limit block have the same rotation radius, so that the first limit block can stop the second limit block after the second limit block rotates by a preset angle.

[0017] Preferably, the transmission component comprises a worm wheel and a worm that are meshed and a housing that is sleeved outside the worm wheel and the worm;

[0018] The outer shell is fixedly connected to the inner tube;

[0019] The worm gear is sleeved and fixed on the outside of the movable sleeve;

[0020] The worm is rotatably mounted inside the housing;

[0021] A connecting shaft coaxially fixed at one end of the worm extends to the outside of the housing.

[0022] Preferably, the movable frame comprises a top section tube, a bottom section tube, a middle section tube and a rotating section;

[0023] The rotating section includes a fixed tube and a rotating tube rotatably sleeved outside the fixed tube;

[0024] The top tube, bottom tube, middle tube and fixed tube constitute the inner tube, and the rotating tube and sleeves fixed at both ends constitute the outer sleeve.

[0025] The straight channel is opened on the wall of the fixed tube;

[0026] The spiral channel is opened on the wall of the rotating tube;

[0027] The mounting frame is fixedly connected to the rotating tube via an I-shaped frame.

[0028] Preferably, a stop plate is fixed on the top of the fixed frame, and a butt plate is fixed on the top of the top section tube, and when the movable frame is in a vertical state, the butt plate just butts against the stop plate.

[0029] Preferably, a guide wheel is provided at the top of the top section tube, and the steel wire rope is turned by the guide wheel and extends to the inside of the inner tube, and the part of the steel wire rope after being turned by the guide wheel remains coaxial with the inner tube.

[0030] Preferably, a slide rail is fixed to the inner circumferential wall of the fixed tube, and a slide groove matching the slide rail is provided on the side of the sliding block.

[0031] Preferably, the driving shaft comprises a round shaft and a square shaft that are fixedly connected;

[0032] A square hole matching the square shaft is provided on the side of the slider;

[0033] The square shaft is fixedly installed inside the square hole by means of bolts.

[0034] Preferably, the outer tube is detachably mounted on the front side of the mounting frame via a fastening assembly;

[0035] The fastening assembly includes a first arc-shaped plate and a second arc-shaped plate fixedly connected by a first screw, a flat plate fixedly connected to the second arc-shaped plate, a clamping plate fixedly connected to the flat plate by a second screw, a screw threaded through the clamping plate, and a handle rod fixed at one end of the screw.

[0036] A method for simulating compression-torsion buckling of a tubular column in a wellbore, the method being based on the above-mentioned device for simulating compression-torsion buckling of a tubular column in a wellbore, comprising the following steps:

[0037] S1. Start the winch, slowly release the wire rope, and put the movable frame and the installation frame into a horizontal state;

[0038] S2. Use a fastening assembly to fix the outer tube on the front of the mounting frame, and place the pipe string test piece inside the outer tube;

[0039] S3, start the axial pressure loading cylinder so that the first and last ends of the pipe string test piece are respectively in contact with the first end detection component and the last end detection component;

[0040] S4. According to the actual test requirements, the rotation angle of the movable sleeve and the first limit block is adjusted by using the worm gear and the worm in conjunction with the indicator and the angle scale. This rotation angle is the angle at which the mounting frame and the outer tube can rotate around the movable frame;

[0041] S5. Start the winch and slowly retract the wire rope to rotate the mounting frame and the outer tube, and gradually tilt the movable frame;

[0042] S51, the process of the mounting frame and the outer tube rotating is: the steel wire rope pulls the slider to gradually move toward the top section tube, driving the driving shaft to move in the linear channel and the spiral channel, so as to use the driving shaft to push the rotating tube with the spiral channel to rotate around the axis of the fixed tube until the second limit block rotates to abut against the first limit block;

[0043] S52, the process of the movable frame gradually tilting is as follows: after the mounting frame and the outer tube rotate at a preset angle, the second limit block abuts against the first limit block, so that the slider cannot continue to move toward the top section tube, and at this time the wire rope pulls the movable frame to rotate around the pivot axis of the hinge seat, and the movable frame drives the mounting frame and the outer tube to gradually tilt until the movable frame tilts to a preset angle and then the winch is turned off;

[0044] S6. Start the torque loading machine and / or the axial pressure loading cylinder according to the test method, and record the relevant experimental data results through the head end detection component and the end end detection component and the buckling state of the pipe string specimen.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] On the one hand, the present invention arranges a winch on the top of the fixed frame, and hinges the bottom end of the movable frame with the base frame fixed at the bottom end of the fixed frame through a hinge seat, so that the inclination angle of the movable frame during the experiment can be adjusted by the winch; on the other hand, by cooperating with the slider, drive shaft, linear channel and spiral channel fixedly connected to the wire rope through the preset mechanism, the winch can be used to rotate the mounting frame and the outer tube around the axis of the movable frame to a predetermined angle; finally, the experimenter can adjust the experimental angle of the outer tube as needed according to the actual situation, so that the experimenter can obtain the experimental results of the pipe column specimens under various inclination angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0048] Figure 2 For the present invention Figure 1 Schematic diagram of the three-dimensional structure from another perspective;

[0049] Figure 3 It is a schematic diagram of the three-dimensional structure of the movable frame of the present invention in a tilted state;

[0050] Figure 4 It is a schematic diagram of a three-dimensional structure in which the movable frame and the mounting frame of the present invention are both in an inclined state;

[0051] Figure 5 For the present invention Figure 4 Schematic diagram of the three-dimensional structure from another perspective;

[0052] Figure 6 It is a partial front view structural schematic diagram of the present invention;

[0053] Figure 7 For the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0054] Figure 8 It is a three-dimensional structural schematic diagram of the movable frame of the present invention;

[0055] Fig. 9 It is a schematic diagram of the three-dimensional structure of the rotating section of the present invention;

[0056] Fig.10 For the present invention Fig. 9 Schematic diagram of the three-dimensional structure after the middle shell is cut;

[0057] Fig.11 It is a schematic diagram of the position structure of the circle of the present invention;

[0058] Fig.12 For the present invention Fig.11 The schematic diagram of the structure with circles omitted;

[0059] Fig.13 For the present invention Fig.12 The enlarged structural diagram at B in the middle;

[0060] Fig.14 It is a schematic diagram of the local structure of the rotating section of the present invention;

[0061] Fig.15 It is a structural schematic diagram of the fixed pipe of the present invention;

[0062] Fig.16 It is a schematic diagram of the cross-section structure of the fixed pipe of the present invention;

[0063] Fig.17 It is a schematic diagram of the exploded structure of the drive shaft and the slider of the present invention.

[0064] In the figure: 1, fixed frame; 11, bottom frame; 12, hinge seat; 13, stop plate; 2, movable frame; 21, top section pipe; 211, guide wheel; 212, stop plate; 22, bottom section pipe; 23, middle section pipe; 24, rotating section; 241, fixed pipe; 2411, linear channel; 2412, slide rail; 242, rotating pipe; 2421, spiral channel; 2422, sleeve; 243, preset mechanism; 2431, movable sleeve; 2432, worm wheel; 2433, worm; 2434, connecting shaft; 2435, housing; 2436, circle; 2437, angle scale line; 2438, indicator ; 2439, first limit block; 24310, second limit block; 244, I-beam; 245, drive shaft; 2451, round shaft; 2452, square shaft; 2453, bolt; 246, slider; 2461, slide groove; 2462, square hole; 3, mounting frame; 31, head end detection assembly; 32, end end detection assembly; 33, fastening assembly; 331, first arc plate; 332, second arc plate; 333, flat plate; 334, splint; 335, screw; 336, handle bar; 4, outer tube; 5, winch; 51, wire rope; 6, torque loader; 7, axial pressure loading cylinder. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] See also Figure 1-Figure 17 , the present invention provides a technical solution:

[0067] The experimental device for simulating compression-torsion buckling of tubular columns in a wellbore comprises seven parts: a fixed frame 1, a movable frame 2, a mounting frame 3, an outer pipe 4, a winch 5, a torque loading machine 6 and an axial pressure loading cylinder 7. These seven parts are described in detail below.

[0068] The fixing frame 1 is arranged vertically as a whole. Further, in some embodiments, the fixing frame 1 can be a gantry frame, and the bottom end of the fixing frame 1 is fixedly connected to the ground through the base frame 11, so that the fixing frame 1 can maintain a vertical state during the overall use. Further, in some embodiments, an inclined inclined plate or other structure can be arranged between the fixing frame 1 and the ground to improve the stability of the fixing frame 1.

[0069] The bottom end of the movable frame 2 is hinged to the bottom frame 11 through a hinge seat 12, so that it can be adjusted between horizontal and vertical. Figure 3-5 That is a structural schematic diagram of the movable frame 2 in an inclined state. The movable frame 2 includes an inner tube and an outer sleeve rotatably mounted outside the inner tube. A straight channel 2411 is opened on the tube wall of the inner tube, and the extension direction of the straight channel 2411 is parallel to the axial direction of the inner tube. A spiral channel 2421 is opened on the tube wall of the outer sleeve. A slider 246 that can slide along its axial direction is arranged inside the inner tube. A driving shaft 245 is fixed to the side of the slider 246. The driving shaft 245 passes through the straight channel 2411 and the spiral channel 2421. A preset mechanism 243 for adjusting the rotation angle of the outer sleeve relative to the inner tube is also arranged on the outside of the inner tube. The basic working principle of the preset mechanism 243 is: when the movable frame 2 is in a horizontal state, the preset mechanism 243 is adjusted so that the preset mechanism 243 can preset the rotation angle of the outer sleeve, and then the outer sleeve can be rotated to the predetermined angle through the winch 5. The further working principle will be described in detail below in conjunction with the relevant structure.

[0070] The mounting frame 3 is fixedly connected to the outer sleeve, that is, the mounting frame 3 can rotate along with the outer sleeve around the axial direction of the movable frame 2, so that the outer tube 4 installed on the mounting frame 3 is rotated by a predetermined angle before conducting relevant experiments, and a head end detection component 31 and a terminal detection component 32 are installed on the mounting frame 3. In this embodiment, the head end detection component 31 and the terminal detection component 32 have basically the same structure as the detection components in the prior art. For example, the head end detection component 31 can detect the pressure and torque data at the head end of the pipe string specimen through a pressure sensor, a torque sensor, etc., and the terminal detection component 32 can detect the pressure and torque data at the terminal end of the pipe string specimen through a pressure sensor, a torque sensor, etc. The specific structure of the head end detection component 31 and the terminal detection component 32 will not be repeated here.

[0071] The outer tube 4 is detachably mounted on the front side of the mounting frame 3, and the pipe column test piece is arranged inside the outer tube 4. The specific structures of the outer tube 4 and the pipe column test piece are also prior art and will not be elaborated here. The head end detection component 31 and the end end detection component 32 are respectively arranged at the head and the end of the pipe column test piece.

[0072] The free end of the wire rope 51 wound on the winch 5 is inserted from the top of the inner tube and fixedly connected to the slider 246. The winch 5 is used to pull the slider 246 to slide inside the inner tube and is also used to adjust the inclination angle of the movable frame 2.

[0073] The torque loading machine 6 is slidably mounted on the top of the mounting frame 3, and the sliding direction of the torque loading machine 6 is parallel to the axial direction of the inner tube. The torque loading machine 6 can adopt a reduction motor.

[0074] The axial pressure loading cylinder 7 is fixedly mounted on the top of the mounting frame 3 , and the output end of the axial pressure loading cylinder 7 is connected to the torque loading machine 6 . The axial pressure loading cylinder 7 can be an electric cylinder or a hydraulic cylinder.

[0075] In the above technical scheme, on the one hand, by arranging a winch 5 on the top of the fixed frame 1, and making the bottom end of the movable frame 2 hinged to the bottom end of the fixed frame 1 through the hinge seat 12, the inclination angle of the movable frame 2 during the experiment can be adjusted by the winch 5; on the other hand, by setting a preset mechanism 243 in conjunction with the slider 246, the drive shaft 245, the straight channel 2411 and the spiral channel 2421 fixedly connected to the wire rope 51, the winch 5 can be used to rotate the mounting frame 3 and the outer tube 4 around the axis of the movable frame 2 to a predetermined angle; finally, the experimenter can adjust the experimental angle of the outer tube 4 as needed according to the actual situation, so that the experimenter can obtain the experimental results of the pipe column specimens at various inclination angles.

[0076] The preset mechanism 243 includes a transmission component, a movable sleeve 2431 driven by the transmission component to rotate around the inner tube, a circle 2436 fixedly set on the outside of the inner tube, an indicator 2438 and a first limit block 2439 fixedly connected to the movable sleeve 2431, and a second limit block 24310 fixedly connected to the outer sleeve. The movable sleeve 2431 and the circle 2436 are coaxially arranged with the inner tube. The outer peripheral surface of the circle 2436 is provided with angle scale lines 2437. The angle scale lines 2437 are used to mark the angle. The indicator 2438 cooperates with the angle scale lines 2437 to indicate the rotation angle of the movable sleeve 2431; the rotation radius of the first limit block 2439 is equal to that of the second limit block 24310, so that the first limit block 2439 can stop the second limit block 24310 after the second limit block 24310 rotates by a preset angle.

[0077] Furthermore, the transmission component includes a worm wheel 2432 and a worm 2433 that are meshed together, and a shell 2435 that is sleeved on the outside of the worm wheel 2432 and the worm 2433; the shell 2435 is fixedly connected to the inner tube; the worm wheel 2432 is sleeved and fixed on the outside of the movable sleeve 2431; the worm 2433 is rotatably installed inside the shell 2435; and a connecting shaft 2434 coaxially fixed at one end of the worm 2433 extends to the outside of the shell 2435.

[0078] The working principle of the preset mechanism 243 is as follows: Under normal conditions, Fig.13 As shown in the figure, the first limit block 2439 and the second limit block 24310 are in a state of abutting against each other. At this time, the angle indicated by the indicator 2438 on the angle scale line 2437 is zero degree. Then, the worm 2433 is driven to rotate by rotating the connecting shaft 2434, so that the worm wheel 2432 rotates clockwise. The clockwise rotation of the worm wheel 2432 further drives the movable sleeve 2431 and the indicator 2438 to rotate clockwise, while the outer sleeve and the circle 2436 remain stationary at this time. Therefore, the actual angle indicated by the indicator 2438 on the angle scale line 2437 can be used to judge whether the movable sleeve 2431 is in a state of abutting against each other. The rotation angle of the movable sleeve 2431, and the first limit block 2439 will gradually move away from the second limit block 24310 during this process. The rotation angle of the movable sleeve 2431 is the preset rotation angle of the outer sleeve (the slider 246 moves under the pull of the wire rope 51, so that the drive shaft 245 drives the outer sleeve to rotate through the spiral channel 2421. During this process, the second limit block 24310 will gradually approach the first limit block 2439 until the second limit block 24310 abuts against the first limit block 2439, and the outer sleeve stops rotating. At this time, the outer sleeve has rotated to the preset angle).

[0079] The movable frame 2 comprises a top section tube 21, a bottom section tube 22, a middle section tube 23 and a rotating section 24. Figure 8As shown, in this embodiment, one top section tube 21, one bottom section tube 22, and one middle section tube 23 are provided respectively, and two rotating sections 24 are provided. The connection relationship between each part is shown in the figure. Specifically, the bottom end of the top section tube 21 is fixedly connected to the top end of the fixed tube 241 of the first rotating section 24 through a flange, the bottom end of the fixed tube 241 of the first rotating section 24 is connected to the top flange of the middle section tube 23, the bottom end of the middle section tube 23 is connected to the top flange of the fixed tube 241 of the second rotating section 24, the bottom end of the fixed tube 241 of the second rotating section 24 is connected to the top flange of the bottom section tube 22, and the bottom end of the bottom section tube 22 is connected to the top flange of the fixed tube 241 of the second rotating section 24. It is hinged to the base frame 11 through a hinge seat 12; the rotating section 24 includes a fixed tube 241 and a rotating tube 242 rotatably sleeved on the outside of the fixed tube 241; wherein, the top section tube 21, the bottom section tube 22, the middle section tube 23 and the fixed tube 241 constitute an inner tube, the rotating tube 242 and the sleeves 2422 fixed at both ends thereof constitute an outer sleeve, and the sleeve 2422 is connected to the fixed tube 241 through a bearing to realize a coaxial rotation connection; the straight channel 2411 is opened in the tube wall of the fixed tube 241; the spiral channel 2421 is opened in the tube wall of the rotating tube 242; the mounting frame 3 is fixedly connected to the rotating tube 242 through an I-shaped frame 244.

[0080] A guide wheel 211 is provided at the top of the top section tube 21. The wire rope 51 extends to the inside of the inner tube after being turned through the guide wheel 211, and the part of the wire rope 51 after being turned through the guide wheel 211 remains coaxial with the inner tube. Since the part of the wire rope 51 after being turned through the guide wheel 211 remains coaxial with the inner tube, the direction of the pulling force exerted by the wire rope 51 on the slider 246 is consistent with the axis of the fixed tube 241, thereby reducing the wear between the slider 246 and the inner surface of the fixed tube 241.

[0081] A slide rail 2412 is fixed to the inner wall of the fixed tube 241, and a slide groove 2461 matched with the slide rail 2412 is opened on the side of the slider 246. The slide rail 2412 and the slide groove 2461 can limit the sliding direction of the slider 246, reduce the wear between the drive shaft 245 and the inner surface of the linear channel 2411 and the inner surface of the spiral channel 2421, and at the same time prevent the slider 246 from rotating around the axis of the fixed tube 241.

[0082] The driving shaft 245 includes a round shaft 2451 and a square shaft 2452 which are fixedly connected; a square hole 2462 matching the square shaft 2452 is opened on the side of the slider 246; the square shaft 2452 is fixedly installed inside the square hole 2462 by bolts 2453, wherein the square shaft 2452 is inserted into the square hole 2462 and then fixed by bolts 2453, so that the round shaft 2451 will not rotate around its own axis, thereby improving the stability of the round shaft 2451 during use.

[0083] A stop plate 13 is fixed to the top of the fixed frame 1 , and a butt plate 212 is fixed to the top of the top section pipe 21 . When the movable frame 2 is in a vertical state, the butt plate 212 just butts against the stop plate 13 .

[0084] The outer tube 4 is detachably mounted on the front side of the mounting frame 3 through a fastening assembly 33; the fastening assembly 33 includes a first arc plate 331 and a second arc plate 332 fixedly connected by a first screw, a flat plate 333 fixedly connected to the second arc plate 332, a clamping plate 334 fixedly connected to the flat plate 333 by a second screw, a screw rod 335 threadedly passing through the clamping plate 334, and a handle rod 336 fixed to one end of the screw rod 335. The first arc plate 331 and the second arc plate 332 are used to clamp the outer tube 4; by rotating the screw rod 335, the extrusion force of the screw rod 335 on the back side of the mounting frame 3 can be adjusted, thereby facilitating the adjustment of the position of the fastening assembly 33 on the mounting frame 3.

[0085] A method for simulating compression-torsion buckling of a tubular column in a wellbore is provided. The method is based on the above-mentioned device for simulating compression-torsion buckling of a tubular column in a wellbore and comprises the following steps:

[0086] S1, start the winch 5, slowly release the wire rope 51, and put the movable frame 2 and the mounting frame 3 into a horizontal state;

[0087] S2, using the fastening assembly 33 to fix the outer tube 4 on the front of the mounting frame 3, and placing the pipe column test piece inside the outer tube 4;

[0088] S3, start the axial pressure loading cylinder 7, so that the first and last ends of the pipe string test piece are respectively in contact with the first end detection component 31 and the last end detection component 32;

[0089] S4. According to the actual test requirements, the worm wheel 2432 and the worm 2433 are used to cooperate with the indicator 2438 and the angle scale line 2437 to adjust the rotation angle of the movable sleeve 2431 and the first limit block 2439. This rotation angle is the angle at which the mounting frame 3 and the outer tube 4 can rotate around the movable frame 2.

[0090] S5, start the winch 5, slowly retract the wire rope 51, rotate the mounting frame 3 and the outer tube 4, and gradually tilt the movable frame 2;

[0091] S51, the process of the mounting frame 3 and the outer tube 4 rotating is as follows: the steel wire rope 51 pulls the slider 246 to gradually move toward the top tube 21, driving the driving shaft 245 to move in the straight channel 2411 and the spiral channel 2421, so as to use the driving shaft 245 to push the rotating tube 242 with the spiral channel 2421 to rotate around the axis of the fixed tube 241, until the second limit block 24310 rotates to abut against the first limit block 2439;

[0092] S52, the process of the movable frame 2 gradually tilting is as follows: after the mounting frame 3 and the outer tube 4 rotate to a preset angle, the second limit block 24310 abuts against the first limit block 2439, so that the slider 246 cannot continue to move toward the top tube 21, and the wire rope 51 will pull the movable frame 2 to rotate around the pivot axis of the hinge seat 12, and the movable frame 2 drives the mounting frame 3 and the outer tube 4 to gradually tilt until the movable frame 2 tilts to a preset angle and the winch 5 is turned off;

[0093] S6. Start the torque loading machine 6 and / or the axial pressure loading cylinder 7 according to the test method, and record the relevant experimental data results through the head end detection component 31 and the tail end detection component 32 as well as the buckling state of the pipe string specimen.

[0094] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A simulation test device for compression-torsion buckling of a tubular column in a wellbore, characterized in that: include: The fixed frame is vertically arranged as a whole, and the bottom end is fixedly connected to the ground through the bottom frame; A movable frame, the bottom end of which is hinged to the base frame through a hinge seat so that it can be adjusted between horizontal and vertical, the movable frame comprises an inner tube and an outer sleeve rotatably sleeved outside the inner tube, a straight channel is provided on the tube wall of the inner tube, a spiral channel is provided on the tube wall of the outer sleeve, a slider which can slide along its axial direction is provided inside the inner tube, a driving shaft is fixed on the side of the slider, the driving shaft passes through the straight channel and the spiral channel, and a preset mechanism for adjusting the rotation angle of the outer sleeve relative to the inner tube is also provided on the outer side of the inner tube; A mounting frame, which is fixedly connected to the outer sleeve, and a head end detection component and a terminal end detection component are installed on the mounting frame; An outer tube is detachably mounted on the front of the mounting frame, a pipe string test piece is arranged inside the outer tube, and the head end detection assembly and the end end detection assembly are respectively arranged at the head and the end of the pipe string test piece; A winch, on which the free end of the wound steel wire rope is inserted from the top end of the inner tube and fixedly connected to the slider; A torque loader is slidably mounted on the top of the mounting frame, and the sliding direction of the torque loader is parallel to the axial direction of the inner tube; and The axial pressure loading cylinder is fixedly mounted on the top of the mounting frame, and the output end of the axial pressure loading cylinder is connected to the torque loading machine.

2. The compression-torsion buckling simulation test device for a wellbore tubing according to claim 1, characterized in that: The preset mechanism includes a transmission component, a movable sleeve driven by the transmission component to rotate around the inner tube, a circle fixedly sleeved outside the inner tube, an indicator and a first limit block fixedly connected to the movable sleeve, and a second limit block fixedly connected to the outer sleeve, the outer peripheral surface of the circle is provided with angle scale lines, and the indicator cooperates with the angle scale lines to indicate the rotation angle of the movable sleeve; The first limiting block and the second limiting block have the same rotation radius, so that the first limiting block can stop the second limiting block after the second limiting block rotates by a preset angle.

3. The compression-torsion buckling simulation test device for a wellbore tubing according to claim 2, characterized in that: The transmission component includes a worm wheel and a worm that are meshed and a housing that is sleeved outside the worm wheel and the worm; The outer shell is fixedly connected to the inner tube; The worm gear is sleeved and fixed on the outside of the movable sleeve; The worm is rotatably mounted inside the housing; A connecting shaft coaxially fixed at one end of the worm extends to the outside of the housing.

4. The compression-torsion buckling simulation test device for a wellbore tubing according to claim 3 is characterized in that: The movable frame comprises a top section tube, a bottom section tube, a middle section tube and a rotating section; The rotating section includes a fixed tube and a rotating tube rotatably sleeved outside the fixed tube; The top tube, bottom tube, middle tube and fixed tube constitute the inner tube, and the rotating tube and sleeves fixed at both ends constitute the outer sleeve. The straight channel is opened on the wall of the fixed tube; The spiral channel is opened on the wall of the rotating tube; The mounting frame is fixedly connected to the rotating tube via an I-shaped frame.

5. The compression-torsion buckling simulation test device for a wellbore tubing according to claim 4, characterized in that: A stop plate is fixed on the top of the fixed frame, and a butt plate is fixed on the top of the top section pipe. When the movable frame is in a vertical state, the butt plate just butts against the stop plate.

6. The test device for simulating compression-torsion buckling of a tubular column in a wellbore according to claim 4, characterized in that: A guide wheel is provided at the top of the top section tube, and the steel wire rope is turned by the guide wheel and extends to the inside of the inner tube, and the part of the steel wire rope after being turned by the guide wheel remains coaxial with the inner tube.

7. The test device for simulating compression-torsion buckling of a tubular column in a wellbore according to claim 4, characterized in that: A slide rail is fixed to the inner peripheral wall of the fixed tube, and a slide groove matched with the slide rail is opened on the side of the sliding block.

8. The compression-torsion buckling simulation test device for a wellbore tubing according to claim 1, characterized in that: The driving shaft comprises a round shaft and a square shaft which are fixedly connected; A square hole matching the square shaft is provided on the side of the slider; The square shaft is fixedly installed inside the square hole by means of bolts.

9. The compression-torsion buckling simulation test device for a wellbore pipe string according to claim 1, characterized in that: The outer tube is detachably mounted on the front side of the mounting frame via a fastening assembly; The fastening assembly includes a first arc-shaped plate and a second arc-shaped plate fixedly connected by a first screw, a flat plate fixedly connected to the second arc-shaped plate, a clamping plate fixedly connected to the flat plate by a second screw, a screw threaded through the clamping plate, and a handle rod fixed at one end of the screw.

10. A method for simulating compression-torsion buckling of a tubular column in a wellbore, characterized in that: The experimental method is based on the wellbore tubing compression-torsion buckling simulation experimental device according to any one of claims 1 to 9, and comprises the following steps: S1. Start the winch, slowly release the wire rope, and put the movable frame and the installation frame into a horizontal state; S2. Use a fastening assembly to fix the outer tube on the front of the mounting frame, and place the pipe string test piece inside the outer tube; S3, start the axial pressure loading cylinder so that the first and last ends of the pipe string test piece are respectively in contact with the first end detection component and the last end detection component; S4. According to the actual test requirements, the rotation angle of the movable sleeve and the first limit block is adjusted by using the worm gear and the worm in conjunction with the indicator and the angle scale. This rotation angle is the angle at which the mounting frame and the outer tube can rotate around the movable frame; S5. Start the winch and slowly retract the wire rope to rotate the mounting frame and the outer tube, and gradually tilt the movable frame; S51, the process of the mounting frame and the outer tube rotating is: the steel wire rope pulls the slider to gradually move toward the top section tube, driving the driving shaft to move in the linear channel and the spiral channel, so as to use the driving shaft to push the rotating tube with the spiral channel to rotate around the axis of the fixed tube until the second limit block rotates to abut against the first limit block; S52, the process of the movable frame gradually tilting is as follows: after the mounting frame and the outer tube rotate at a preset angle, the second limit block abuts against the first limit block, so that the slider cannot continue to move toward the top section tube, and at this time the wire rope pulls the movable frame to rotate around the pivot axis of the hinge seat, and the movable frame drives the mounting frame and the outer tube to gradually tilt until the movable frame tilts to a preset angle and then the winch is turned off; S6. Start the torque loading machine and / or the axial pressure loading cylinder according to the test method, and record the relevant experimental data results through the head end detection component and the end end detection component and the buckling state of the pipe string specimen.

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