Test device for simulating wear of full-size casing pipe and drill rod joint

Abstract

The invention discloses a test device for simulating wear of a full-size casing and a drill rod joint. The test device comprises an axial vibration system, a transmission system, a six-degree-of-freedom platform, a tank and a three-jaw chuck. The axial vibration system drives the drill rod joint to vibrate axially, and the amplitude and frequency of vibration can be changed by adjusting the rollers to act on different concave-convex annular channels of the concave-convex disc. The transmission system drives the drill rod to rotate, the sleeve is fixed by the clamp, and wear simulation tests of different axial included angles and radial vibration of the sleeve and the drill rod joint are realized through the six-degree-of-freedom platform. A drilling fluid inlet and outlet hole is formed in the tank body, drilling fluid is controlled to enter from a liquid inlet hole in the lower portion of the tank and exit from a liquid outlet hole in the middle, and the actual circulation direction of the drilling fluid on the friction surface is simulated. According to the device, the axial and radial composite vibration of the drill rod joint and the full-size casing in a drilling fluid environment and the abrasion test of the casing and the drill rod joint in well sections with different dog-leg-degree bends are realized through the design, and the friction abrasion between the casing and the drill rod joint under complex underground working conditions can be simulated more truly. The drill rod joints are connected with the transmission shaft through the adapters, and abrasion tests of drill rod joints of different sizes and sleeves can be achieved by replacing the adapters.

Description

Technical Field

[0001] The present invention relates to the field of friction and wear test devices, and specifically to a wear test device for simulating the wear of a full-size casing and a drill pipe joint. Background Art

[0002] In oil and gas well drilling operations, the wear problem between the drill pipe joint and the casing is one of the key factors leading to the failure of downhole tools and an increase in drilling costs. With the increasing number of deep wells, ultra-deep wells, and complex-structured wells, under the combined working conditions of high temperature, high pressure, high vibration, and drilling fluid environment, the wear behavior between the drill pipe joint and the casing shows non-linear dynamic characteristics. In the prior art, most traditional wear test devices adopt a single vibration mode (such as only axial or only radial vibration), and cannot truly simulate the complex motion state of the "axial-torsional-radial" coupled vibration of the downhole drill string; at the same time, most of the wear of the drill pipe joint occurs in the curved section of the wellbore. For example, in Chinese Patent Application CN200610113419.3, a sliding table type casing wear testing machine, by installing two specimens on different platforms, the first specimen is installed on the sliding platform and driven to rotate by the transmission system, the second specimen is fixed on the stationary platform, and the sliding platform causes the second specimen to impact and friction the first specimen through the stroke change caused by the rotation of the lower cam. However, the cam stroke change can only cause the second specimen to vibrate radially relative to the first specimen, and cannot simulate the actual combined vibration wear working condition. Another example is Chinese Patent Application 202110018208.6, a device for measuring the wear of drill pipes and casings. In this device, the drill pipe is relatively fixed, the drill string moves and presses against the drill pipe. The structure is relatively simple. At the same time, the drill string is guided to move by the directional sliding mechanism, which can ensure linear contact between the drill pipe and the casing and uniform force and wear at each part. However, it can only simulate the wear situation when the axes of the casing and the drill pipe joint are parallel in the actual straight well section, and cannot simulate the wear situation when the axes of the casing and the drill pipe joint are not parallel and present a certain angle in the actual curved well section. Summary of the Invention

[0003] In order to improve the deficiencies of the above existing devices, the present invention provides a wear test device for simulating the wear of a full-size casing and a drill pipe joint, and its technical solution is as follows:

[0004] A simulated full-size casing and drill pipe joint wear test device, characterized by comprising: an axial vibration system, a transmission system, a six-degree-of-freedom platform, a tank and a three-jaw chuck. The axial vibration system includes an adjustable vibration generating mechanism, which is composed of a concave-convex disk, a spring, a linear bearing, a roller, a guide plate, a connecting rod, a large gear, a small gear, a stepping motor, a deep groove ball bearing, and an axial positioning member first sleeve, a second sleeve and a shaft ring. The axial vibration system causes the roller to roll on the concave-convex ring through the relative rotation between the concave-convex disk and the guide plate, causing the lower transmission shaft to vibrate axially. The transmission system includes a speed regulating motor, an elastic coupling, a lower transmission shaft, a first adapter, a second adapter, an upper transmission shaft and a shaft retaining spring connected in sequence according to the transmission sequence. The six-degree-of-freedom platform includes a triangular top plate, a disk hinge seat, a hinge pin shaft, a universal connector, an arm hinge seat, a hydraulic arm, a round bottom plate, and a fixed shaft plate; a three-jaw chuck is installed and fixed under the six-degree-of-freedom platform, and the three-jaw chuck clamps the casing test piece. The six-degree-of-freedom platform can be used to control the radial loading of the casing on the drill pipe joint, simulating the wear test in which the casing and the drill pipe joint are parallel in the straight well section and at an angle to the axis of the casing and the drill pipe joint in the curved well section. The radial vibration of the casing can also be controlled by six degrees of freedom to achieve a wear test with working conditions closer to the actual drilling environment. The tank includes a tank body, a support frame, and a buckle;

[0005] Preferably, at least two concave-convex rings with different vibration waveforms are provided on the upper surface of the concave-convex disk at intervals along the circumferential direction, and a square ring groove and a circular ring groove are provided on the lower surface. The square ring groove is used for the concave-convex disk to be installed and matched with the support frame, and grease is stored in the circular ring groove to reduce the friction between the concave-convex disk and the support frame. Four linear bearings are installed on the circumferentially uniform part of the guide plate, the middle part of the linear bearing is slidably connected with the guide plate, and the lower part of the linear bearing is connected with a roller that rolls with the concave-convex ring. A deep groove ball bearing is installed between the guide plate and the lower transmission shaft, and a spring is installed between the lower part and the concave-convex disk. The axial positioning member is installed on the lower transmission shaft, and from top to bottom, they are a shaft ring, a first sleeve, and a second sleeve. The first sleeve is installed between the shaft ring and the large gear, and the second sleeve is installed between the large gear and the guide plate. The shaft ring is installed under the Y-type sealing ring installation groove on the lower transmission shaft, and supports the Y-type sealing ring while bearing the axial vibration force. When the lower transmission shaft rotates, the concave-convex disk is driven to rotate while the guide plate does not rotate therewith, so that the roller and the concave-convex disk rotate relative to each other, causing the guide plate to vibrate, and the vibration is transmitted through the axial positioning piece, finally realizing the axial vibration of the lower transmission shaft and the drill pipe joint.

[0006] Preferably, four arc through grooves are provided on the surface of the large gear, which are connected in a mating manner with the cylindrical head at the upper part of the connecting rod. The end of the connecting rod is connected with the square groove at the upper part of the linear bearing, and a deep groove ball bearing is installed between the large gear and the lower transmission shaft. The stepping motor is installed in the motor seat on the guide rail disc. The stepping motor drives the small gear to rotate, and the small gear drives the large gear to rotate, so that the connecting rod slides along the groove on the large gear, realizing the track change of the roller on the concave-convex disc, and further realizing different axial vibration simulations.

[0007] Preferably, the speed-regulating motor and the lower transmission shaft are connected by an elastic coupling. The lower transmission shaft and the drill pipe joint are connected by a first adapter, and the upper transmission shaft and the drill pipe joint are connected by a second adapter, and an axial positioning of the drill pipe joint is carried out by an axial retaining ring for shafts. By replacing different adapters, tests on drill pipe joints of different sizes can be realized.

[0008] Preferably, the lower part of the round chassis is connected with a three-jaw chuck, and six disc hinge seat installation grooves are provided on the upper surface. Six disc hinge seat installation grooves are also provided on the lower surface of the triangular top disc, and a handle for easy installation is provided on the upper surface. Arm hinge seats are installed at both ends of the hydraulic arm. The disc hinge seat and the arm hinge seat are connected by a universal connector. Pin holes are provided on the hinge seats, and the hinge pin passes through the pin holes and the universal connector and is fixed on the hinge seat through a fixed shaft disc.

[0009] Preferably, three grooves for cooperating with the triangular top disc are provided at the top of the tank body. Three buckle installation seats are provided near the lower part of the grooves. A drilling fluid inlet and outlet is opened on the circumferential surface of the body. A through hole for the lower transmission shaft to pass through is provided in the middle layer. A circular ring clamping table is provided at the bottom and is connected with the support frame. A hole is provided on the buckle. One end of the buckle is installed on the buckle installation seat on the tank body, and the other end presses and fixes the triangular top disc. The support frame body is provided with a concave-convex disc installation and a tank body clamping groove. Four support seats are provided below to support the weight of the device, and a tank body support ring is provided above. Four columns are used to connect it with the support frame body.

[0010] Preferably, the Y-shaped sealing ring is installed in the groove of the lower transmission shaft. The inner edge contacts the lower transmission shaft, and the outer edge contacts the through hole in the middle layer of the tank body, realizing the axial vibration sealing of the hole.

[0011] Compared with the existing casing wear test equipment, the present invention has the following advantages:

[0012] In the present invention, the drill pipe joint specimen is connected with the lower transmission shaft. The axial vibration system generates axial vibration with the start of the speed-regulating motor, driving the drill pipe joint specimen to rotate and vibrate axially at the same time. The casing specimen in the present invention is clamped by a three-jaw chuck installed on a six-degree-of-freedom platform, and the radial vibration of the casing relative to the drill pipe can be controlled by controlling the six-degree-of-freedom platform. And each vibration function is independently adjustable, and an axial-radial coupled vibration wear test of the drill pipe joint specimen and the casing specimen can be realized, which is similar to the actual wear condition underground.

[0013] The drill pipe joint specimen in the present invention is connected to the transmission shaft through an adapter. By replacing different adapters, wear tests of drill pipe joints and casings with different sizes can be achieved.

[0014] The casing specimen in the present invention is clamped by a three-jaw chuck installed on a six-degree-of-freedom platform. By controlling the six-degree-of-freedom platform, the included angle between the axis of the casing specimen and the axis of the drill pipe joint can be controlled. When the included angle is zero, the wear test of the drill pipe joint and the casing in the vertical well section can be simulated; when the included angle is not zero, the wear test of the drill pipe joint and the casing in the deviated well section with different dogleg severity can be simulated.

[0015] In the present invention, by adjusting the stepping motor, the rotation angle of the large gear is changed, so that the connecting rod slides along the groove on the large gear, realizing the orbit change of the roller on the concave-convex disc, and further realizing different axial vibration simulations.

[0016] In the present invention, there are drilling fluid inlet and outlet on the tank body. The liquid outlet is located above the liquid inlet. When the drilling fluid circulation device is started, the drilling fluid flows from bottom to top, which is similar to the actual drilling fluid flow direction. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0019] Figure 2 It is a schematic structural view of the axial vibration system of the present invention;

[0020] Figure 3 It is a schematic structural view of the roller orbit change of the present invention;

[0021] Figure 4 It is a schematic structural view of the transmission system of the present invention;

[0022] Figure 5 It is a partial enlarged schematic view at A;

[0023] Figure 6 It is a schematic structural view of the six-degree-of-freedom platform of the present invention;

[0024] Figure 7 It is a schematic structural view of the Hooke joint of the present invention;

[0025] Figure 8 It is a schematic structural view of the tank of the present invention;

[0026] Figure 9 This is a schematic structural diagram of the three-jaw chuck of the present invention.

[0027] Explanation of the reference numerals in the attached drawings:

[0028] 1 - Axial vibration; 2 - Transmission system; 3 - Six-degree-of-freedom platform; 4 - Tank; 5 - Drill pipe joint specimen; 6 - Casing specimen; 7 - Three-jaw chuck; 8 - Y-shaped sealing ring;

[0029] 101 - Concave-convex disc; 102 - Spring; 103 - Linear bearing; 104 - Roller; 105 - Guide rail disc; 106 - Connecting rod; 107 - Large gear; 108 - Small gear; 109 - Stepper motor; 110 - Deep groove ball bearing; 111 - First sleeve; 112 - Second sleeve; 113 - Shaft collar; 201 - Speed-regulating motor; 202 - Elastic coupling; 203 - Lower transmission shaft; 204 - First adapter; 205 - Second adapter; 206 - Upper transmission shaft; 207 - Shaft retaining ring; 301 - Triangular top disc; 302 - Disc hinge seat; 303 - Hinge pin shaft; 304 - Universal connector; 305 - Arm hinge seat; 306 - Hydraulic arm; 307 - Round bottom disc; 308 - Fixed shaft disc; 401 - Tank body; 402 - Support frame; 403 - Buckle piece; 501 - Male joint; 502 - Female joint; Specific embodiments

[0030] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0032] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment:

[0035] Please refer to Figure 1 , Figure 1 , which is a schematic cross-sectional view of the overall structure of the present invention. A device for simulating the wear test of a full-size casing and a drill pipe joint includes an axial vibration system 1, a transmission system 2, a six-degree-of-freedom platform 3, a tank 4, and a three-jaw chuck 7. Among them: The transmission system 2 is provided with a speed-regulating motor 201 fixed to the ground. The speed-regulating motor 201 and the lower transmission shaft 203 are connected by an elastic coupling 202, allowing a certain amount of axial displacement between the two while reducing impact vibration. The drill pipe joint specimen 5 and the lower transmission shaft 203 are connected by a first adapter 204 and are driven to rotate by the speed-regulating motor 201; The axial vibration system 1 is installed on the lower transmission shaft 203. When the speed-regulating motor 201 is started, the axial vibration system 1 drives the lower transmission shaft 203 to axially vibrate, and finally the drill pipe joint specimen 5 axially vibrates; The casing specimen 6 is clamped by a three-jaw chuck 7 installed on the six-degree-of-freedom platform 3. By controlling the six-degree-of-freedom platform 3, the casing specimen 6 can be controlled to achieve the radial vibration and rotation of the casing specimen 6, and to achieve the simulation of axial-radial composite vibration and the wear test of the vertical well section and the deviated well section; The six-degree-of-freedom platform 3 is installed and fixed on the tank 4, and the lower part of the tank 4 is provided with a support frame 402 to support the whole device.

[0036] Please refer to Figure 2 , Figure 2This is a schematic structural diagram of the axial vibration system of the present invention. The concave-convex disk 101 is key-connected to the lower transmission shaft 203. There are a square-round ring groove and a round-round ring groove at the bottom of the concave-convex disk 101. The square-round ring groove is used for the connection between the concave-convex disk 101 and the support frame 402. Since there will be a large area of contact friction between the rotating concave-convex disk and the support frame 402, grease is stored in the round-round ring groove to reduce the friction between the two. The connection of the square-round ring groove can reduce the leakage of grease. The spring 102 is fixed between the concave-convex disk 101 and the guide rail disk 105 by fixing both ends, reducing the pressure of the roller on the concave-convex ring track and the rigid impact. Four linear bearings 103 are circumferentially and evenly installed on the guide rail disk 105, enabling the linear bearings 103 to slide easily along the inner cylindrical track of the guide rail disk 105. A deep groove ball bearing 110 is installed between the guide rail disk 105 and the lower transmission shaft 203. The lower part of the linear bearing 103 is connected to a roller 104, and there is a bearing in the middle of the roller 104. On the lower transmission shaft 203, axial positioning parts for the installation of the vibration system 3, a shaft collar 113, a first sleeve 111, and a second sleeve 112 are installed in sequence from top to bottom. When the lower transmission shaft 203 rotates, it first causes the roller 104 to vibrate up and down along the concave-convex ring track. The vibration force is transmitted to the guide rail disk 105 through the connection between the middle part of the linear bearing 103 and the inner cylinder of the guide rail disk 105. The upper part of the deep groove ball bearing 110 in the guide rail disk 105 contacts the second sleeve 112, and the lower part contacts the bottom of the bearing installation groove in the guide rail disk 105. The vibration force is transmitted to the second sleeve 112 through the deep groove ball bearing 110, and then transmitted to the first sleeve 111 through the deep groove ball bearing 110 between the large gear 107 and the lower transmission shaft 203, and finally transmitted to the lower transmission shaft 203 through the shaft collar 113 to generate axial vibration.

[0037] Please refer to Figure 3 , Figure 3 This is a schematic structural diagram of the roller track-changing structure of the present invention. Four arc through grooves are provided on the surface of the large gear 107, which are connected in cooperation with the upper cylindrical head of the connecting rod 106. The end of the connecting rod 106 is connected to the square groove at the upper part of the linear bearing 103, restricting the rotation of the connecting rod 106 and preventing the roller 104 from being stuck due to the rotation of the connecting rod 106 when changing the concave-convex ring track. A deep groove ball bearing 110 is installed between the large gear 107 and the lower transmission shaft 203 to ensure that the rotation of the lower transmission shaft 203 and the large gear 107 does not affect each other. The stepping motor 109 is installed in the motor seat on the guide rail disk 105. The stepping motor 109 drives the small gear to rotate, and the small gear 108 drives the large gear 107 to rotate, causing the connecting rod 106 to slide along the groove on the large gear 107, thereby realizing the track change of the roller 104 on the concave-convex disk 101 and further realizing different axial vibration simulations.

[0038] Please refer to Figure 4 , Figure 5 , Figure 4 This is a schematic structural diagram of the transmission system of the present invention, Figure 5It is a partial enlarged schematic diagram of point A. The drill pipe joint sample 5 is threadedly connected to the lower transmission shaft 203 and the upper transmission shaft 206 through the first adapter 204 and the second adapter 205. If the drill pipe joint sample 5 of different sizes needs to be replaced, it is not necessary to replace the transmission shaft, but only to replace the matching adapter. The upper and lower transmission shafts are provided with shaft retaining ring 207 installation grooves, and the shaft retaining ring 207 is used for axial positioning during the installation of the drill pipe joint sample 5; the lower transmission shaft 203 is provided with a Y-type sealing ring 8 installation groove, and the shaft ring 113 is fixed below the Y-type sealing ring 8 to play a supporting role.

[0039] Please refer to Figures 6 to 9 , Figure 6 is a schematic diagram of the structure of the six-degree-of-freedom platform of the present invention, Figure 7 is a schematic structural diagram of the Hooke's hinge of the present invention, Figure 8 It is a structural schematic diagram of the tank of the present invention, Figure 9 It is a schematic diagram of the structure of the three-jaw chuck of the present invention. The triangular top plate 301 and the circular bottom plate 307 of the six-degree-of-freedom platform 3 are each provided with six hinge seat mounting grooves for connecting with the disc hinge seat 302. Both ends of the hydraulic arm 306 are also provided with hinge seat mounting structures for connecting with the arm hinge seat 305. The disc hinge seat 302 and the arm hinge seat 305 are connected through a universal connector 304, the universal connector 304 and the hinge seat are connected through a hinge pin shaft 303, and the hinge pin shaft 303 and the hinge seat are connected through a fixed shaft plate 308; the upper part of the three-jaw chuck 7 is provided with a boss structure that cooperates with the lower part of the circular bottom plate 307, which increases the stability of the connection between the two. The upper part of the tank body 401 is provided with three slots that match the outer edge of the triangular top plate 301, and the lower part of the slot is provided with a buckle plate mounting seat. The cylindrical end of the buckle plate 403 is provided with a through hole connected to the shaft in the mounting seat, and the sheet end is provided with a connecting hole for fixing the triangular top plate 301; the tank body 401 is provided with a drilling fluid inlet and outlet, and the liquid outlet is located above the liquid inlet. When the drilling fluid circulation device is started, the drilling fluid flows from bottom to top, simulating the actual drilling process, in which the drilling fluid flows back from the wellbore and the drill pipe to the direction; the lower part of the support frame 402 is four bases for supporting the entire device, and the middle structure is used for connecting the concave-convex plate 101 with the tank body 401, and the upper part is provided with an annular protective ring for increasing the stability of the tank body 401.

[0040] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A wear test device for simulating a full-size casing and drill pipe joint, characterized in that Including: Axial vibration system, transmission system, six-degree-of-freedom platform, tank and three-jaw chuck. The axial vibration system includes an adjustable vibration generating mechanism, which is composed of a cam-disc, a spring, a linear bearing, a roller, a guide rail disc, a connecting rod, a large gear, a small gear, a stepping motor, a deep groove ball bearing and axial positioning parts including a first sleeve, a second sleeve and an axle collar. The axial vibration system causes the roller to roll on the cam-and-groove track through the relative rotation between the cam-disc and the guide rail disc, thereby driving the axial vibration of the lower transmission shaft. The transmission system includes a speed regulating motor, an elastic coupling, a lower transmission shaft, a first adapter, a second adapter, an upper transmission shaft and a shaft retaining ring, which are connected in sequence according to the transmission order. The six-degree-of-freedom platform includes a triangular top disc, a disc hinge seat, a hinge pin shaft, a universal connector, an arm hinge seat, a hydraulic arm, a round bottom disc and a fixed shaft disc; a three-jaw chuck is fixedly installed under the six-degree-of-freedom platform, and the three-jaw chuck holds the casing specimen. The radial loading of the casing on the drill pipe joint can be controlled through the six-degree-of-freedom platform to simulate the wear test of the straight well section where the axis of the casing is parallel to that of the drill pipe joint and the bent well section where the axis of the casing forms an angle with that of the drill pipe joint. The radial vibration of the casing can also be controlled through the six degrees of freedom to realize a wear test with a working condition closer to the actual drilling environment. The tank includes a tank body, a support frame and a buckle piece.

2. The simulated full-size casing and drill pipe joint wear test device according to claim 1, characterized in that: At least two cam-and-groove tracks with different vibration waveforms are circumferentially spaced on the upper surface of the cam-disc. The lower surface is provided with a square ring groove and a circular ring groove. The square ring groove is used for the installation and cooperation of the cam-disc and the support frame, and the circular ring groove stores grease to reduce the friction between the cam-disc and the support frame. Four linear bearings are circumferentially and evenly installed on the guide rail disc. The middle part of the linear bearing is slidably connected to the guide rail disc, and the lower part of the linear bearing is connected with a roller that rolls on the cam-and-groove track. A deep groove ball bearing is installed between the guide rail disc and the lower transmission shaft, and a spring is installed between the lower part and the cam-disc. The axial positioning parts are installed on the lower transmission shaft, which are the axle collar, the first sleeve and the second sleeve from top to bottom. The first sleeve is installed between the axle collar and the large gear, the second sleeve is installed between the large gear and the guide rail disc, and the axle collar is installed under the Y-shaped sealing ring groove on the lower transmission shaft, which supports the Y-shaped sealing ring while bearing the axial vibration force. When the lower transmission shaft rotates, it drives the cam-disc to rotate while the guide rail disc does not rotate accordingly, causing relative rotation between the roller and the cam-disc, resulting in the vibration of the guide rail disc. The vibration is transmitted through the axial positioning parts, and finally the axial vibration of the lower transmission shaft and the drill pipe joint is realized.

3. The simulated full-size casing and drill pipe joint wear test device according to claim 2, characterized in that: Four arc through grooves are provided on the surface of the large gear, which are connected with the upper cylindrical head of the connecting rod in a matching manner. The end of the connecting rod is connected with the square groove on the upper part of the linear bearing. A deep groove ball bearing is installed between the large gear and the lower transmission shaft. The stepping motor is installed in the motor seat on the guide rail disc. The stepping motor drives the small gear to rotate, and the small gear drives the large gear to rotate, causing the connecting rod to slide along the groove on the large gear, realizing the track change of the roller on the cam-disc, and further realizing different axial vibration simulations.

4. The full-scale casing and drill pipe joint wear simulation test device according to claim 1, characterized in that: The speed-regulating motor is connected to the lower transmission shaft through an elastic coupling. The lower transmission shaft is connected to the drill pipe joint through a first adapter. The upper transmission shaft is connected to the drill pipe joint through a second adapter. An axial positioning of the drill pipe joint is carried out by an axial retaining ring for shafts. By replacing different adapters, tests on drill pipe joints of different sizes can be realized.

5. The full-scale casing and drill pipe joint wear simulation test device according to claim 1, characterized in that: The lower part of the round chassis is connected to a three-jaw chuck, and six disc hinge seat mounting grooves are provided on the upper surface. Six disc hinge seat mounting grooves are also provided on the lower surface of the triangular top disc, and a handle for easy installation is provided on the upper surface. Arm hinge seats are installed at both ends of the hydraulic arm. The disc hinge seats are connected to the arm hinge seats through universal connectors. Pin holes are provided on the hinge seats, and the hinge pin passes through the pin holes and the universal connector is fixed to the hinge seat through a fixed shaft disc.

6. The full-scale casing and drill pipe joint wear simulation test device according to claim 1, characterized in that: Three grooves for cooperating with the triangular top disc are provided at the top of the tank body. Three buckle mounting seats are provided near the lower part of the grooves. A drilling fluid inlet and outlet are formed on the circumferential surface of the body. A through hole for the lower transmission shaft to pass through is provided in the middle layer. A circular ring clamping platform is provided at the bottom and is connected to the support frame. A hole is provided on the buckle. One end of the buckle is installed on the buckle mounting seat of the tank body, and the other end presses and fixes the triangular top disc. The support frame body is provided with a concave-convex disc for installation and a tank body clamping groove. Four support seats are provided below to support the weight of the device, and a tank body support ring is provided above. Four columns are used to connect it to the support frame body.

7. The full-scale casing and drill pipe joint wear simulation test device according to claim 1, characterized in that: The Y-shaped sealing ring is installed in the groove of the lower transmission shaft. The inner edge contacts the lower transmission shaft, and the outer edge contacts the through hole in the middle layer of the tank body to achieve axial vibration sealing of the hole.

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