Reducing and speed-increasing type drilling tool check valve erosion resistance simulation detection test bed

Abstract

The invention discloses a hole shrinkage and speed increase type drilling tool check valve erosion resistance simulation detection test bed which comprises a mortar box, a variable diameter type circulating pipeline, a mortar conveying assembly, a stirring machine and a drainage sleeve. The stirrer is used for stirring liquid mortar, the upper end face of the mortar box is configured to be a detection working platform, a backflow window is formed in the detection working platform, a flow guide hole is formed in the bottom of the mortar box, the drainage end of the variable-diameter circulating pipeline is connected to the flow guide hole, and the erosion end of the variable-diameter circulating pipeline is connected with the upper end of the detection check valve in a matched mode. The drainage sleeve is connected with the lower end of the detection check valve in a matched mode and extends into the mortar box through the backflow window. According to the test bed, gradient reduction of the flux of the circulating pipeline is utilized to increase the flowing speed of liquid mortar, the unfavorable condition that regulation and control of the flowing speed of the liquid mortar completely depend on the running power of the mortar pump is changed, the reliability and stability of liquid mortar flowing speed control are effectively improved, the running power of the mortar pump is reduced, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of erosion resistance detection of drilling tool check valve, in particular to a reduced diameter and increased speed type drilling tool check valve erosion resistance simulation detection test bench. BACKGROUND

[0002] The drilling tool check valve is a special downhole device for preventing the high-pressure fluid and drilling fluid from spewing out of the drilling tool in the field of oil and gas drilling production, and can be one-way conducted under the action of circulating fluid. Since the circulating fluid flow rate pumped at the wellhead is large during drilling, the sand particles in the circulating fluid continuously impact the valve core in the check valve at high speed, and the chemical components in the circulating fluid also continuously corrode and damage the check valve, so that the check valve core is often eroded and damaged and loses the safety protection function. In order to fully understand the erosion and damage mechanism of the circulating fluid to the check valve core, to optimize and improve the structure and function of the check valve core, and to provide a scientific basis for effectively enhancing the erosion resistance of the check valve core, it is necessary to conduct necessary erosion resistance detection test on the drilling tool check valve in production and scientific research activities.

[0003] At present, the detection method of the erosion resistance of the drilling tool check valve is to use a high-power motor to drive a mud pump to simulate the flow state of the circulating fluid under the well in the production test environment, continuously impact the check valve core under the simulated test state, observe the test process, and collect detection data. However, since the supporting device of this detection method has generally large power and high energy consumption, there are obvious problems of serious equipment wear, high operating cost, and low working efficiency during use, and the supporting tooling is not complete, especially when the check valve needs to be vertically connected to the lower end of the circulating fluid flow pipeline for test, since the hoisting operation process is difficult, the check valve is usually manually moved and connected and installed on the circulating fluid flow pipeline, which has the disadvantages of high labor intensity and low installation efficiency.

[0004] Therefore, it is necessary to research and improve the erosion resistance simulation detection test device of the drilling tool check valve in the prior art, optimize the design structure and function, improve the liquid flow speed-up efficiency, perfect the supporting operation tooling, improve the simulation degree of the simulation environment, and ensure the accuracy of the test results. SUMMARY

[0005] In order to solve the above technical problems, the present application provides a reduced diameter and increased speed type drilling tool check valve erosion resistance simulation detection test bench.

[0006] The technical scheme for solving the above technical problems is as follows: a reduced diameter and increased speed type drilling tool check valve erosion resistance simulation detection test bench, comprising a sand slurry tank, a variable diameter circulating pipeline, a sand slurry conveying assembly, a mixer, and a flow guide sleeve. The mortar box contains liquid mortar, the mixer is located on the mortar box and is used for stirring the liquid mortar, the upper end surface of the mortar box is configured as a detection workbench, a reflux window is formed on the detection workbench, a flow guide hole is formed on the bottom of the mortar box, the flow guide hole is arranged on the side away from the reflux window, the flow guide end of the variable-diameter circulating pipeline is connected to the flow guide hole, the erosion end of the variable-diameter circulating pipeline is connected to the upper end of the detection check valve, the flow guide sleeve is connected to the lower end of the detection check valve, and the flow guide sleeve extends into the mortar box through the reflux window; The variable-diameter circulating pipeline, the detection check valve and the flow guide sleeve form a closed loop for circulating the liquid mortar and are separated from the external environment, and the mortar conveying assembly is used for pumping the liquid mortar from the mortar box into the variable-diameter circulating pipeline and forming a circulating erosion flow outside the mortar box.

[0007] Further, the variable-diameter circulating pipeline comprises a first pipe segment, a second pipe segment and a third pipe segment connected in sequence, the first pipe segment, the second pipe segment and the third pipe segment are arranged in sequence from the flow guide end to the erosion end, and the diameters are sequentially reduced.

[0008] Further, the mortar conveying assembly comprises a mortar pump and a motor for driving the mortar pump to operate, and the first pipe segment of the variable-diameter circulating pipeline is connected to the mortar pump.

[0009] Further, a threaded joint is mounted on the end of the erosion end, the threaded joint is connected to the upper end of the detection check valve in communication, and the detection check valve is kept vertically arranged.

[0010] Further, the stop valve loading vehicle further comprises a vehicle body, a wheel, a bearing seat, a screw lever, a nut sleeve and a thrust bearing. The wheel is arranged on the vehicle body, the bearing seat is mounted on the vehicle body, the nut sleeve is coaxially stacked on the bearing seat through the thrust bearing, so that the nut sleeve can rotate axially relative to the bearing seat, and the screw lever is respectively inserted into the central shaft hole of the nut sleeve and the bearing seat.

[0011] Further, the detection workbench is respectively provided with a guide rail and a limiting column, the guide rail limits the movement track of the stop valve loading vehicle moving from the loading station to the detection station of the detection check valve, and the limiting column is arranged correspondingly with the guide rail, so that the stop valve loading vehicle moving to the detection station can be positioned on the detection station.

[0012] Further, the upper end of the screw lever is detachably provided with a supporting ring, the outer circumference of the supporting ring is inserted into the central shaft hole of the lower end of the detection check valve, and the structure of the supporting ring and the lower end of the detection check valve is correspondingly matched, so that the screw lever can stably and reliably vertically support the detection check valve.

[0013] Further, the mortar box is provided with a filter screen box, and the filter screen box surrounds the flow guide hole, and the liquid mortar pumped into the variable-diameter circulating pipeline is filtered.

[0014] Further, the detection check valve is provided with an image monitoring head. Further, the variable-diameter circulating pipeline is provided with a flow rate sensor at the erosion end port.

[0015] The present application has the following advantages: the present application provides a kind of simulation test bench for checking the erosion resistance of reduced-diameter speed-increasing drill tool check valve: (1) the structure function is optimized, the liquid mortar circulating pipeline with variable aperture is used, the flow velocity of liquid mortar is increased by using the principle of step reduction of circulating pipeline flux, the flow velocity of liquid mortar is controlled by auxiliary mortar pump, the technical defects that the flow velocity of liquid mortar is completely dependent on the operating power of mortar pump are overcome, the reliability of liquid mortar flow velocity control and the stability of liquid mortar flow are effectively improved, the liquid flow speed-increasing efficiency of liquid mortar is improved, the operating power of mortar pump is reduced, the operating cost is reduced, and the work efficiency is improved; (2) the detection check valve loading and unloading operation tool is improved, the check valve loading vehicle is used, the detection check valve can be vertically carried and accurately positioned on the detection station of the working platform, and the detection check valve can be directly installed on the circulating pipeline or separated from the circulating pipeline on the detection station, the manual operation of workers is replaced, the operation efficiency is significantly improved, and the labor intensity is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the overall structural diagram of the present application.

[0017] Figure 2 It is the structure diagram of the test check valve installation state of the check valve installation area of the present application.

[0018] Figure 3 It is the side view of the test check valve installation state structure of the present application.

[0019] Figure 4 It is Figure 3 It is the enlarged view of the local part I.

[0020] Figure 5 It is the structure diagram of the test check valve installation state of the check valve installation area of the present application.

[0021] Figures 1 to 5The reference signs shown in the drawings represent: 1 - mortar box, 2 - variable-diameter circulating pipeline, 3 - mortar pump, 4 - motor, 5 - mixer, 6 - flow guide sleeve, 7 - threaded joint, 8 - guide rail, 9 - limiting column, 10 - check valve loading vehicle, 11 - vehicle body, 12 - wheel, 13 - bearing seat, 14 - screw lever, 15 - nut sleeve, 16 - thrust bearing, 17 - supporting ring, 18 - anti-rotation pin, 19 - turning groove hole, 20 - detection check valve, 21 - filter screen box, 22 - image monitoring head, 23 - flow rate sensor, 24 - structure frame, 25 - fixed clasp ring, 26 - mounting seat, 27 - hand plate valve, 28 - valve core. DETAILED DESCRIPTION

[0022] The principles and characteristics of the present application are described below in conjunction with the drawings, and the examples are only used to explain the present application and are not intended to limit the scope of the present application.

[0023] As shown in Figure 1 A reduced-diameter and increased-speed drill tool check valve erosion resistance simulation test bench, comprising a mortar box 1, a variable-diameter circulating pipeline 2, a mortar conveying assembly, a mixer 5 and a flow guide sleeve 6. The mortar box 1 is a cubic container, the upper end face is a detection work platform, and the inside is filled with liquid mortar prepared from sand and tackifying water. The mortar conveying assembly includes a mortar pump 3 and a motor 4 for driving the mortar pump 3 to operate. The mixer 5 is located on the mortar box 1 and is used for stirring and mixing the liquid mortar. The upper end face of the mortar box 1 is configured as a detection work platform, and a backflow window is formed on the detection work platform. A flow guide hole is formed at the bottom of the mortar box 1 and on the opposite side of the backflow window. The flow guide end of the variable-diameter circulating pipeline 2 is connected to the flow guide hole, and the erosion end of the variable-diameter circulating pipeline 2 is connected to the upper end of the detection check valve 20. The flow guide sleeve 6 is connected to the lower end of the detection check valve 20, and the flow guide sleeve 6 extends into the mortar box 1 through the backflow window. Specifically, the flow guide sleeve 6 is threadedly connected to the lower end of the detection check valve 20, and the liquid mortar for high-speed erosion of the detection check valve 20 is guided back to the mortar box 1 through the backflow window. A threaded joint 7 is installed on the end of the erosion end of the variable-diameter circulating pipeline 2, and the threaded joint 7 is connected in communication with the upper end of the detection check valve 20, and the detection check valve 20 is kept vertically arranged.

[0024] The variable-diameter circulating pipeline 2, the detection check valve 20 and the flow guide sleeve 6 form a closed loop for circulating the liquid mortar, which is separated from the external environment, and the mortar conveying assembly is used for pumping the liquid mortar from the mortar tank 1 into the variable-diameter circulating pipeline 2 and forming a circulating erosion flow outside the mortar tank 1. The variable-diameter circulating pipeline 2 is a variable-diameter pipeline, the pipeline diameter is gradually reduced from the flow guide end to the erosion end, so that the liquid mortar pumped into the variable-diameter circulating pipeline 2 can increase the flow rate as the aperture of the flow area is reduced, until it is injected into the detection check valve 20 in the form of a high-speed jet at the erosion end, the detection check valve 20 erodes the inner cavity and the valve core 28 installed in the inner cavity of the detection check valve 20, and simulates the environment state of the detection check valve 20 eroded by the mud when it works underground.

[0025] As shown in Figure 1 The variable-diameter circulating pipeline 2 is supported by the structural frame 24 and arranged on the upper part of the working platform, specifically, the variable-diameter circulating pipeline 2 includes a first pipe segment, a second pipe segment and a third pipe segment connected in sequence, the first pipe segment, the second pipe segment and the third pipe segment are arranged in sequence from the flow guide end to the erosion end, and the diameters are gradually reduced. Among them, the first pipe segment is marked as A in the figure, which is a large aperture segment; the second pipe segment is marked as B in the figure, which is a medium aperture segment; the third pipe segment is marked as C in the figure, which is a small aperture segment. The first pipe segment of the variable-diameter circulating pipeline 2 is connected to the mortar pump 3.

[0026] In this embodiment, the device further includes a check valve loading vehicle 10, the check valve loading vehicle 10 includes a vehicle body 11, wheels 12, a bearing seat 13, a lead screw lever 14, a lead screw sleeve 15 and a thrust bearing 16; The vehicle body 11 is rectangular in shape, the lateral width corresponds to the interval between the two guide rails 8 arranged on the working platform, and is arranged between the two guide rails 8 by cooperating with the double-side limiting. The wheels 12 are arranged on the vehicle body 11, the bearing seat 13 and the nut sleeve 15 are annular sleeve bodies corresponding in structure, the outer circumferential surface of the nut sleeve 15 is provided with a wrenching groove hole 19, the inner circumferential surface of the nut sleeve 15 is provided with an internal thread, the bearing seat 13 is installed on the vehicle body 11, and the nut sleeve 15 is coaxially stacked on the bearing seat 13 through the thrust bearing 16, so that the nut sleeve 15 can rotate axially relative to the bearing seat 13. The outer thread is arranged on the outer circumferential surface of the lead screw lever 14, and the anti-rotation groove is arranged in the axial direction, and the lead screw lever 14 is respectively inserted into the central shaft hole of the nut sleeve 15 and the bearing seat 13. Through the corresponding cooperation between the outer thread on the outer circumferential surface and the internal thread on the inner circumferential surface of the nut sleeve 15, the nut sleeve 15 forms a nut and lead screw cooperation structure, and at the same time, the anti-rotation pin 18 installed on the bearing seat 13 and the anti-rotation groove arranged on the lead screw lever 14 are embedded and limited in position to limit the rotation of the lead screw lever 14 relative to the bearing seat 13. Through the nut and lead screw cooperation structure between the nut sleeve 15 and the lead screw lever 14, the lead screw lever 14 can be lifted or lowered axially relative to the bearing seat 13 by wrenching the nut sleeve 15.

[0027] The detection working platform is respectively provided with the guide rail 8 and the limiting column 9, the guide rail 8 is a limiting track corresponding to the structure of the vehicle body 11, and the movement track of the check valve loading vehicle 10 moving from the loading station to the detection station of the detection check valve 20 is limited through the guide rail 8, the limiting column 9 is correspondingly arranged with the guide rail 8, and the check valve loading vehicle 10 moving to the detection station can be positioned on the detection station, and the lead screw lever 14 and the threaded joint 7 installed on the erosion end of the variable-diameter circulating pipeline 2 are kept perpendicular and coaxial on the detection station.

[0028] The upper end of the lead screw lever 14 is detachably provided with a supporting ring 17, the outer circumference of the supporting ring 17 is inserted and matched with the central shaft hole of the lower end of the detection check valve 20, and the supporting ring 17 is matched with the structure of the lower end of the detection check valve 20, so that the lead screw lever 14 can stably and reliably support the detection check valve 20 vertically, and when impacted or worn and damaged, only the supporting ring 17 needs to be replaced, which not only can reduce the cost consumption, but also can shorten the tool maintenance and repair time and improve the detection work efficiency.

[0029] The mortar box 1 is provided with a filter screen box 21, and the filter screen box 21 surrounds the flow guide hole, filters the liquid mortar pumped into the variable-diameter circulating pipeline 2, prevents large-particle impurities or sundries accidentally mixed in the mortar box 1 from entering the variable-diameter circulating pipeline 2, changes the simulation state of the liquid mortar, and has an adverse effect on the accuracy and reliability of the simulation test data of the erosion resistance of the drilling tool check valve.

[0030] The image monitoring head 22 is arranged on the check valve 20, and specifically, the image monitoring head 22 is arranged on the upper portion of the valve core 28 arranged in the inner cavity of the check valve 20. The working state of the valve core 28 under the erosion of the liquid mortar and the dynamic destruction process of the inner cavity of the check valve 20 and the valve core 28 caused by the erosion are recorded in real time by means of external equipment, so as to provide a reference basis for the improvement and perfection of the structure and performance of the check valve 20.

[0031] The flow rate sensor 23 is arranged at the erosion end port of the variable-diameter circulating pipeline 2. The flow rate sensor 23 is used to dynamically monitor the flow speed of the liquid mortar at the erosion end of the variable-diameter circulating pipeline 2, and the circulating flow speed of the liquid mortar is controlled according to the monitoring parameters, so as to ensure the simulation flow state of the liquid mortar and meet the environmental condition requirements for the erosion resistance performance detection of the check valve 20.

[0032] The detection test bench is used for detecting the erosion resistance performance of the drill check valve, and the specific operation steps are as follows: S1: The check valve loading vehicle 10 is placed on the loading station on the working platform of the variable-diameter and speed-increasing drill check valve erosion resistance performance simulation detection test bench. The turning rod is inserted into the turning slot hole 19 arranged on the outer circumference of the nut sleeve 15. The nut sleeve 15 is turned by means of the turning rod. The lead screw lever 14 is adjusted downward to the lowest position by means of the nut sleeve 15 and the nut and screw structure of the lead screw lever 14. As shown in the figure, the supporting ring 17 is sleeved on the upper end of the lead screw lever 14. The flow rate sensor 23 is installed in the mounting seat 26 in advance. The installation state of the filter screen box 21 and the closed state of the hand valve 27 are checked. The liquid mortar is heated to the detection test temperature of 16-82℃. The basic preparation work of the detection test is completed. Figure 4 S2: The detection check valve 20 is vertically lifted to the loading station area. The lower end of the detection check valve 20 is aligned with the supporting ring 17 and slowly sent downward. The detection check valve 20 is sleeved and carried on the supporting ring 17 at the same time. After the detection check valve 20 is stably loaded, the lifting tool is removed. Then the check valve loading vehicle 10 is gently pushed along the limited track of the guide rail 8. The check valve loading vehicle 10 is moved to the detection station and positioned in the detection station by the limiting column 9. At this time, as shown in the figure, the lead screw lever 14 and the supporting ring 17 are vertically coaxial with the threaded joint 7 arranged on the erosion end of the variable-diameter circulating pipeline 2. Figure 2 ​​S3: reverse wrench wrench lever wrench nut 15, lifting the lead screw lever 14 and its bearing on the lead screw lever 14 on the detection check valve 20, until the detection check valve 20 and the upper end of the threaded joint 7 with each other docking, then rotate the detection check valve 20 body, detection check valve 20 and threaded joint 7 threaded connection, rotating connection process detection check valve 20 gradually lifted and with the support ring 17 off, when the detection check valve 20 and threaded joint 7 fully connected firmly, such as Figure 1 And Figure 5 As shown, the fixed clasp 25 fixed clasp detection check valve 20 valve body, detection check valve 20 is fixed on the structure frame 24, again using the wrench lever wrench nut 15 down to the lowest position of the lead screw lever 14, so that the support ring 17 can be completely out of the lower end of the detection check valve 20, after the check valve loading car 10 from the detection station back to the loading station, complete the installation of the detection check valve 20; S4: image monitoring head 22 inserted into the mounting seat 26, image monitoring head 22 and the flow rate sensor 23 has been preloaded with external image display and information collection instrument corresponding connection, determine the image monitoring head 22 and flow rate sensor 23 work properly, the drainage sleeve 6 connected to the lower end of the detection check valve 20, while opening the hand plate valve 27, complete the preparation work of starting operation; S5: first start the mixer 5 stirring in the mortar box 1 in the liquid mortar, pre-stirring minutes in keeping the mixer 5 continues to run at the same time, start the motor 4 driven mortar pump 3 operation, driving liquid mortar in the variable diameter circulating pipe 2 to establish circulating flow, using flow rate sensor 23 detection variable diameter circulating pipe 2 small hole diameter C in the liquid flow rate of the sand, when the flow rate reaches the test design value 6.1 meters per second, the test officially started and this as the starting point to record the circulation time of the liquid mortar, the test process to maintain the flow rate and temperature of the liquid mortar, and through the image monitoring head 22 real-time observation of the detection check valve 20 valve core 28 structure and working condition, test duration is usually more than 200 hours, during which when the image monitoring head 22 observed detection check valve 20 valve core 28 appears obvious structural damage or loss of function can be stopped immediately test process, in turn, close the motor 4 and the mixer 5, terminate the liquid flow cycle of the liquid mortar, after closing the hand plate valve 27, disassembly and pull out the image monitoring head 22 from the mounting seat 26; S6: After the drainage sleeve 6 is removed from the detection check valve 20, the check valve loading vehicle 10 is pushed from the loading station to the detection station, the nut sleeve 15 is turned by the turning lever, the lead screw lever 14 is lifted upwards until the supporting ring 17 is inserted into the center axis hole of the detection check valve 20, then the fixing clasp ring 25 is removed, the connection between the supporting frame 24 and the detection check valve 20 is loosened, then the detection check valve 20 is turned and kept cooperating with the supporting ring 17, the threaded connection between the detection check valve 20 and the threaded joint 7 is loosened, until the detection check valve 20 is completely separated from the threaded joint 7 and is stably supported on the supporting ring 17, after the detection check valve 20 and the supporting ring 17 are stably connected, the check valve loading vehicle 10 is pulled back from the detection station to the loading station, finally the detection check valve 20 is lifted away from the loading station by the lifting tool for further structural performance analysis, thus the detection test of the detection check valve 20 is completed.

[0033] The preferred embodiments of the present application have been described above with the aid of drawings, but the present application is not limited to these embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A kind of simulation test bench of erosion resistance performance of reduced-diameter speed-increasing drill tool check valve, it is characterized in that, Including mortar box (1), variable diameter circulating pipeline (2), mortar delivery assembly, mixer (5) and drainage sleeve (6); The mortar box (1) contains liquid mortar, the mixer (5) is located on the mortar box (1) and is used for stirring the liquid mortar, the upper end surface of the mortar box (1) is configured as a detection workbench, the detection workbench is provided with a backflow window, the bottom of the mortar box (1) is provided with a flow guide hole, the flow guide hole is arranged on the side away from the backflow window, the flow guide end of the variable diameter circulating pipeline (2) is connected to the flow guide hole, the erosion end of the variable diameter circulating pipeline (2) is connected to the upper end of the detection check valve (20), the drainage sleeve (6) is connected to the lower end of the detection check valve (20), and the drainage sleeve (6) extends into the mortar box (1) through the backflow window. The variable diameter circulating pipeline (2), the detection check valve (20) and the drainage sleeve (6) are combined to form a closed loop for circulating the liquid mortar and separated from the external environment, and the mortar delivery assembly is used for pumping the liquid mortar from the mortar box (1) into the variable diameter circulating pipeline (2) and forming a circulating erosion flow outside the mortar box (1).

2. The erosion performance simulation test bench for the reduced-diameter and increased-speed drill string check valve according to claim 1, characterized in that, The variable diameter circulating pipeline (2) comprises first, second and third pipe sections connected in sequence, the first, second and third pipe sections are arranged in sequence from the flow guide end to the erosion end, and the diameters are sequentially reduced.

3. The erosion performance simulation test bench for the reduced-diameter and increased-speed drill string check valve according to claim 1, characterized in that, The mortar delivery assembly comprises a mortar pump (3) and a motor (4) for driving the mortar pump (3) to operate, and the first pipe section of the variable diameter circulating pipeline (2) is connected to the mortar pump (3).

4. The erosion performance simulation test bench for the reduced-diameter and increased-speed drill string check valve according to claim 1, characterized in that, A threaded joint (7) is mounted on the end of the erosion end of the variable diameter circulating pipeline (2), the threaded joint (7) is connected to the upper end of the detection check valve (20) in communication, and the detection check valve (20) is kept vertically arranged.

5. The erosion performance simulation test bench for the reduced-diameter and increased-speed drill string check valve according to claim 1, characterized in that, It also includes a check valve loading vehicle (10), the check valve loading vehicle (10) includes a vehicle body (11), a wheel (12), a bearing seat (13), a lead screw lever (14), a nut sleeve (15) and a thrust bearing (16); The wheel (12) is arranged on the vehicle body (11), the bearing seat (13) is mounted on the vehicle body (11), the nut sleeve (15) is coaxially stacked on the bearing seat (13) through the thrust bearing (16), so that the nut sleeve (15) can rotate axially relative to the bearing seat (13), and the lead screw lever (14) is respectively inserted into the central shaft hole of the nut sleeve (15) and the bearing seat (13).

6. The erosion performance simulation test bench for the reduced-diameter and increased-speed drill string check valve according to claim 5, characterized in that, The detection workbench is respectively provided with a guide rail (8) and a limiting column (9), the guide rail (8) limits the movement track of the check valve loading vehicle (10) moving from the loading station of the detection check valve (20) to the detection station, and the limiting column (9) is arranged correspondingly with the guide rail (8), so that the check valve loading vehicle (10) moved to the detection station can be positioned on the detection station.

7. The erosion performance simulation test bench for the reduced-diameter and increased-speed drill string check valve according to claim 6, characterized in that, The upper end of the screw lever (14) is detachably connected with a supporting ring (17), the outer circumference of the supporting ring (17) is insertedly matched with the central axial hole of the lower end of the detection check valve (20), and the supporting ring (17) is correspondingly matched with the structure of the lower end of the detection check valve (20), so that the screw lever (14) can stably and reliably vertically support the detection check valve (20).

8. The erosion performance simulation test bench for the reduced-diameter and speed-increasing drill string check valve according to claim 1, characterized in that, The mortar box (1) is provided with a filter screen box (21), and the filter screen box (21) surrounds the flow guide hole to filter the liquid mortar pumped into the variable-diameter circulating pipeline (2).

9. The erosion performance simulation test bench for reduced-diameter, speed-increasing drill string check valve according to claim 1, characterized in that, An image monitoring head (22) is installed on the detection check valve (20).

10. The erosion performance simulation test bench for reduced-diameter, speed-increasing drill string check valve according to claim 1, characterized in that, A flow rate sensor (23) is arranged at the erosion end port of the variable-diameter circulating pipeline (2).

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