CN212964854U - Physical simulation device for testing friction resistance of crack - Google Patents
Physical simulation device for testing friction resistance of crack Download PDFInfo
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- CN212964854U CN212964854U CN202021621892.4U CN202021621892U CN212964854U CN 212964854 U CN212964854 U CN 212964854U CN 202021621892 U CN202021621892 U CN 202021621892U CN 212964854 U CN212964854 U CN 212964854U
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Abstract
The utility model provides a test crack rubs physical simulation device who hinders belongs to oil gas yield increase transformation field. The device includes a housing; one end of the inner cavity of the shell is a crack inlet end, and the other end of the inner cavity of the shell is a crack outlet end; the width of the inner cavity of the shell is gradually reduced from the crack inlet end to the crack outlet end; a pump injection joint is arranged at the crack inlet end of the shell, and an outlet joint is arranged at the crack outlet end of the shell; the shell is provided with at least one communicating hole, the communicating hole communicates the inner cavity of the shell with the outside of the shell, a sensor connecting pipe is arranged in each communicating hole, and each sensor connecting pipe is connected with a pressure sensor. Utilize the utility model discloses can simulate the flow of fracturing fluid in the crack well, utilize a plurality of pressure sensor that arrange at the front bezel to measure the independent pressure that obtains the different positions of crack department.
Description
Technical Field
The utility model belongs to oil gas yield increase transformation field, concretely relates to physical simulation device that test crack rubs and hinders.
Background
At present, the volume fracturing technology has been popularized and applied in a large area, but the core of the volume fracturing technology is to improve the net pressure of a fracture to the maximum extent. Because the width of the crack is relatively small, the friction resistance of the crack is large, and the pressure in the shaft is reduced to a certain extent after being transmitted to the end part of the crack. The current pressure monitoring means can only monitor in a shaft, and the pressure at different positions of a crack is different due to different friction resistance of the crack. Therefore, the net pressure at different positions in the crack is difficult to accurately judge, and the complexity degree of the crack is difficult to accurately predict and control.
Chinese patent publication CN102661910B discloses an experimental apparatus for measuring the friction resistance of fluid in a fracturing fracture and a working method thereof, which includes a pump, a heating device, a pipeline, a pipe column and an artificial simulation fracture, and simulates the friction resistance of fracturing fluids with different viscosities, different sand contents and different flow rates during fracturing and different formation fluids under the conditions of different fracture widths, different fracture wall surface roughnesses, different in-fracture filtration amounts and the like during production. Chinese patent publication CN203849930U discloses a device for testing friction resistance of fracture, which comprises a sand adding device, a sand mixing tank, a delivery pump and a friction resistance testing box which are connected by pipelines, wherein the outlet of the friction resistance testing box is connected with the sand mixing tank by a backflow pipeline, a flow meter and a first pressure sensor are respectively arranged on a pipeline between the friction resistance test box and the delivery pump, a second pressure sensor is arranged on a return line at the outlet end of the friction resistance testing box, the flowmeter, the first pressure sensor and the second pressure sensor are respectively connected with a data acquisition system, the friction resistance test box comprises a box body, a rock core clamping module is arranged in the box body, an artificial crack with a certain width is arranged in the rock core clamping module and used for simulating a hydraulic fracturing crack of a rock stratum to be tested, and a liquid inlet and a liquid outlet are respectively arranged on the wall of the box body corresponding to the two ends of the artificial crack, and a plurality of perforation holes communicated with the artificial crack are respectively arranged on the pipeline communicated with the liquid inlet end.
However, in the past, when fracture pressure analysis is performed, a wellhead pressure sensor is generally used for calculating the pressure of a horizontal shaft (bottom hole), and the pressure from the horizontal shaft to the inside of a fracture and the change of the pressure are difficult to calculate. Therefore, there is a need to develop a device for testing the frictional resistance at different locations inside the crack to solve the above limitations.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the difficult problem that exists among the above-mentioned prior art, provide a test crack rubs physical simulation device that hinders, can test the pressure of the different positions of crack department for calculate pressure gradient and calculate the friction that rubs of the different positions of different cracks. And providing a basis for predicting the net pressure of the actual underground fracture and the complexity degree of the fracture.
The utility model discloses a realize through following technical scheme:
a physical simulation device for testing friction resistance of a crack comprises a shell;
one end of the inner cavity of the shell is a crack inlet end, and the other end of the inner cavity of the shell is a crack outlet end;
the width of the inner cavity of the shell is gradually reduced from the crack inlet end to the crack outlet end;
a pump injection joint is arranged at the crack inlet end of the shell, and an outlet joint is arranged at the crack outlet end of the shell;
the shell is provided with at least one communicating hole, the communicating hole communicates the inner cavity of the shell with the outside of the shell, a sensor connecting pipe is arranged in each communicating hole, and each sensor connecting pipe is connected with a pressure sensor.
The utility model is further improved in that the shell comprises a front plate, a rear plate, a top plate, a bottom plate, an inlet arc plate and an outlet arc plate;
the front plate is positioned on the front side, the rear plate is positioned on the rear side, the top plate is positioned on the upper side, the bottom plate is positioned on the lower side, the inlet arc-shaped plate is positioned on the left side, and the outlet arc-shaped plate is positioned on the right side;
the front plate, the rear plate, the top plate, the bottom plate, the inlet arc-shaped plate and the outlet arc-shaped plate are enclosed to form the shell.
The utility model discloses a further improvement lies in, the inside wall of front bezel, the inside wall of back plate are unevenness's coarse curved surface.
The utility model is further improved in that the top plate and the bottom plate are arranged in parallel;
the front plate, the rear plate, the inlet arc plate and the outlet arc plate are all perpendicular to the top plate and the bottom plate.
The utility model is further improved in that the front side of the top plate is connected with the upper end of the front plate, and the rear side of the top plate is connected with the upper end of the rear plate;
the front side of the bottom plate is connected with the lower end of the front plate, and the rear side of the bottom plate is connected with the lower end of the rear plate;
crack inlet ends are formed on the left side of the front plate and the left side of the rear plate, and crack outlet ends are formed on the right side of the front plate and the right side of the rear plate;
the distance between the front plate and the rear plate is gradually reduced from the crack inlet end to the crack outlet end.
The utility model has the further improvement that the lower end of the inlet arc-shaped plate is connected with the left end of the bottom plate, and the upper end of the inlet arc-shaped plate is simultaneously connected with the left end of the top plate and the pump injection joint;
the pump injection joint is positioned above the top plate;
the front end of the inlet arc-shaped plate is connected with the left end of the front plate, and the rear end of the inlet arc-shaped plate is connected with the left end of the rear plate.
The utility model is further improved in that the lower end of the outlet arc plate is connected with the right end of the bottom plate, and the upper end of the outlet arc plate is simultaneously connected with the right end of the top plate and the outlet joint;
the outlet joint is positioned above the top plate;
the front end of the outlet arc-shaped plate is connected with the right end of the front plate, and the rear end of the outlet arc-shaped plate is connected with the right end of the rear plate.
The utility model has the further improvement that the radius of the inlet arc-shaped plate is larger than that of the outlet arc-shaped plate;
the central angles of the inlet arc plate and the outlet arc plate are both larger than 180 degrees.
The utility model is further improved in that a plurality of intercommunicating pores are arranged on the front plate, and the central axes of all intercommunicating pores are vertical to the front plate;
the central axes of all the communication holes are positioned in a plane which is parallel to the bottom plate and the top plate.
Preferably, all the communication holes are uniformly arranged in the length direction of the front plate.
The utility model is further improved in that the sensor connecting pipe is of a cylindrical structure, and one end of the sensor connecting pipe is arranged in the communicating hole and communicated with the communicating hole;
the other end of the sensor connecting pipe is located outside the shell and connected with the pressure sensor.
The utility model discloses a further improvement lies in, the pump annotates the joint and the pump is annotated the headtotail, the outlet joint is connected with the liquid reserve tank.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a simulation crack reduces from the width of crack entrance point to crack exit end gradually, has the actual cracked unevenness's of simulation internal surface in seam face overall arrangement moreover, consequently utilizes the utility model discloses can simulate the flow of fracturing fluid in the crack well, utilize a plurality of pressure sensor that arrange at the front bezel moreover to measure the independent pressure that obtains the different positions of crack department to can calculate the pressure gradient in the crack, obtain the crack friction drag of different width cracks, the different degree of depth positions department.
Drawings
FIG. 1 is a front view of a physical simulation device for testing crack friction resistance according to the present invention;
FIG. 2 is a sectional view taken along line A-A in FIG. 1;
FIG. 3 is a top view of the physical simulation device for testing crack friction resistance of the present invention;
fig. 4 is a sectional view taken along line B-B in fig. 3.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the actual crack monitoring result shows that the width of the actual crack in the fracturing operation is generally less than 20mm, the height of the crack can reach dozens of meters, and due to the limitation of the discharge capacity of the indoor experimental pump, the simulated crack width and the crack height of the test device can be reduced as long as the flow rate of liquid in the crack of the test device is the same as the actual flow rate. The slot length simulated by the test apparatus is as long as the test conditions permit (as the actual slot length can be hundreds of meters). Considering that the actual slit width decreases toward the slit end, the slit width from the inlet end to the outlet end in the physical model is designed to gradually decrease. Furthermore, simulation of fractures of different widths, in particular branching fractures and microcracks, is considered.
In addition, in order to be closer to the actual situation, the surface of the crack is designed to be a rough curved surface with convex and concave, and the shape of the rough curved surface with convex and concave can refer to a three-dimensional shape scanning pattern of the surface of the crack of the core or the outcrop. Since only the fracture friction is calculated, the maximum pressure at the injection and exit ends can be designed to be 10 mpa. In order to monitor the pressure and change of the crack at different positions, a pressure sensor is arranged every 10cm in the length direction of the physical model. Considering that more time is spent in the fracture where proppant is migrating, a proppant addition system is also connected and a screw pump can be used for accurate proppant metering.
As shown in fig. 1-4, the utility model discloses a physical simulation device for testing crack friction resistance, including casing 2, the inner chamber one end of casing 2 is crack entrance end 201, and the other end is crack exit end 203. The width of the interior of the housing 2 decreases from the fracture entrance end 201 to the fracture exit end 203. The shell comprises a front plate, a rear plate, a top plate, a bottom plate, an inlet arc-shaped plate and an outlet arc-shaped plate, wherein the front plate is positioned at the front side, the rear plate is positioned at the rear side, the top plate is positioned at the upper side, the bottom plate is positioned at the lower side, the inlet arc-shaped plate is positioned at the left side, and the outlet arc-shaped plate is positioned at the right side; the shell is formed by enclosing a front plate, a rear plate, a top plate, a bottom plate, an inlet arc-shaped plate and an outlet arc-shaped plate. And a simulation crack is formed between the inner side wall of the front plate and the inner side wall of the rear plate.
A pump-in connector 1 is arranged at the crack inlet end 201 of the housing 2, and an outlet connector 3 is arranged at the crack outlet end 203 of the housing 2. Pump notes connect 1 can with pump notes headtotail, outlet joint 3 can be connected with the liquid reserve tank, pump notes connect 1, outlet joint 3 adopt with current pump notes system, the liquid reserve tank matching the joint can, pump notes system, liquid reserve tank also adopt current equipment can.
At least one communication hole is formed in the housing 2, the communication hole communicates the inner cavity of the housing with the outside of the housing, a sensor connecting pipe 4 is installed in each communication hole, the sensor connecting pipe 4 is a cylindrical structure, one end of the sensor connecting pipe is installed in the communication hole and communicates with the communication hole (for example, the sensor connecting pipe can be installed in the communication hole by welding), the other end of the sensor connecting pipe 4 is located outside the housing 2 and is connected with the pressure sensor, the structure of the end is designed according to the connection structure of the pressure sensor, for example, if the pressure sensor is a threaded connection structure, a thread connected with the pressure sensor is arranged at the end, and the pressure sensor is connected by the threaded connection structure.
The embodiment of the utility model is as follows:
[ EXAMPLES one ]
The housing 2 includes a front plate 207, a rear plate 206, a top plate 208, and a bottom plate 209, wherein a front side of the top plate 208 is connected to an upper end of the front plate 207, a rear side of the top plate 208 is connected to an upper end of the rear plate 206, a front side of the bottom plate 209 is connected to a lower end of the front plate 207, and a rear side of the bottom plate 209 is connected to a lower end of the rear plate 206. The top plate 208 and the bottom plate 209 are arranged in parallel.
The front plate 207 and the rear plate 206 are perpendicular to the top plate 208 and the bottom plate 209, a crack inlet end 201 is formed on the left side of the front plate 207 and the left side of the rear plate 206, and a crack outlet end 203 is formed on the right side of the front plate 207 and the right side of the rear plate 206. The distance between the front and rear plates 207, 206 decreases from the fracture entrance end 201 to the fracture exit end 203, and thus the width of the fracture entrance end 201 is greater than the width of the fracture exit end 203.
[ example two ]
In this embodiment the distance between the front plate 207 and the rear plate 206 at the crack entrance end 201 is 8mm and the distance between the front plate 207 and the rear plate 206 at the crack exit end 203 is 1 mm.
[ EXAMPLE III ]
At the fracture entrance end 201, a front plate 207 and a back plate 206 are connected by an inlet arc 204, the central axis of the inlet arc 204 is perpendicular to the top plate 208 and the bottom plate 209; the lower extreme of import arc 204 with the left end of bottom plate 209 is connected, the upper end of import arc 204 is connected with the left end of roof 208, pump notes joint 1 simultaneously, pump notes joint 1 is located the top of roof 208, pump notes joint 1 is through the inner chamber intercommunication of import arc 204 with casing 2, the front end of import arc 204 is connected with the left end of front bezel 207, the rear end of import arc 204 is connected with the left end of back plate 206.
At the fracture exit end 203, the front and back plates are connected by an exit arc 205, the central axis of the entry arc 204 being perpendicular to the top plate 208 and the bottom plate 209; the lower extreme of export arc 205 with the right-hand member of bottom plate 209 is connected, the upper end of export arc 205 is connected with the right-hand member of roof 209, outlet joint 3 simultaneously, outlet joint 3 is located the top of roof 208, the front end of export arc 205 is connected with the right-hand member of front bezel 207, the rear end of export arc 205 is connected with the right-hand member of back plate 206.
Because the width of the inlet end of the slit is greater than the width of the outlet end of the slit, the radius of the inlet arc 204 is greater than the radius of the outlet arc 205, and the central angles of the inlet arc and the outlet arc are both greater than 180 degrees.
[ EXAMPLE IV ]
The front plate 207 is provided with a plurality of communication holes, the central axes of all the communication holes are perpendicular to the front plate 207, and the central axes of all the communication holes are positioned in a plane which is parallel to the bottom plate and the top plate. Preferably, all the communication holes are uniformly arranged along the length direction of the front plate, i.e., the distance between two adjacent communication holes is the same.
All install sensor connecting pipe 4 in every communicating hole, the one end of sensor connecting pipe 4 is installed in the communicating hole, and the other end is located the outside of casing, through threaded connection mode connection pressure sensor.
In this embodiment, one pressure sensor is installed every 10cm along the length of the front plate 207.
[ EXAMPLE V ]
The inner side wall of the front plate 207 and the inner side wall of the back plate 206 are both rough curved surfaces 202, and the surfaces of the inner side walls can be processed into rough curved surfaces by adopting various existing methods, for example, the surfaces of the inner side walls of the front plate and the inner side walls of the back plate can be corroded into the rough curved surfaces 202 with unevenness by controlling the acid amount in a local area in an acid corrosion mode. The shape of the rough surface 202 may be designed with reference to a three-dimensional topographical scan pattern of the fracture surface of the core or outcrop.
[ EXAMPLE six ]
The measuring range of the pressure sensor (which can be realized by adopting a pressure sensor sold in the market) is 0-10mpa, the measuring range of a flowmeter connected on a pipeline connected with the pump injection joint 1 is 0-500l/min, the length of the model is 4m, the height of the model is 0.1m, the width of the crack inlet end is 8mm, and the width of the crack outlet end is 1 mm.
In practical use, the width of the crack inlet end and the width of the crack outlet end can be set to be 6mm and 1mm respectively or 4mm and 1mm respectively. The model for each slot width requires 41 pressure sensors and 1 flow meter. The liquid storage tank can be pressed to 1m3And (5) designing. Proppant storage tank can be as 0.5m3And (4) preparing. If there are multiple particle size proppants, 1 proppant storage tank should be prepared each.
In practical production, the top plate 208, the bottom plate 209, the front plate 207, the rear plate 206, the inlet arc plate 204 and the outlet arc plate 205 are processed respectively, and then are connected into an integrated shell by welding, wherein the cross section of the shell is shown by the same hatching in fig. 4, and different hatching is not used for distinguishing the plates.
The utility model provides a simulation crack reduces from the width of crack entrance point to crack exit end gradually, has the cracked unevenness's of simulation actual internal surface including the seam face overall arrangement simultaneously, arranges a plurality of pressure sensor in the side. The testing device can test the independent pressure at different positions of the fracture, thereby calculating the pressure gradient in the fracture, finally measuring the friction resistance in the fracture at different width and different depth positions, and providing a basis for the net pressure and prediction in the actual fractured fracture and the prediction of the complexity degree of the fracture.
The following experiments can be performed with the above apparatus:
the fracturing fluid is input from the pump injection port 1 and output from the outlet joint 3, and the pressure of each pressure sensor is measured. The device can be used for testing the pressure and the change condition of different fracture positions under the conditions of different discharge capacities, different liquids, different viscosities, different proppant types and different proppant particle sizes and sand-liquid ratios, so that the corresponding fracture friction resistance is determined.
Firstly testing the friction resistance without a propping agent, testing the displacement according to 50-100-150-200-250l/min and the viscosity of the fracturing fluid according to 1-5-10-15-20-30-40-50mpa.s, combining the displacement and the displacement for 40, injecting the fracturing fluid into the shell 2 through the pump injection interface 1, recording the pressure and the change of 41 pressure sensors (the pressure and the flow are recorded according to 1min of data), wherein the friction resistance at different positions is the pressure difference between the pressure sensor at the inlet and the pressure sensor at the corresponding position. The fracture friction measured at different times should be the same unless the fracturing fluid performance and displacement are changed. The fracture friction gradient may thus be calculated based on the distance of the fracture location from the injection end.
Next, in the above 40 cases, the friction gradient and variation at different positions of the fracture under different proppant types, particle sizes and sand-to-fluid ratios were tested. The sand-liquid ratio is generally 1-3-5-7-9-11-13-15-17-19-21%. The particle size is generally 3, such as 70-140 mesh, 40-70 mesh and 30-50 mesh. And injecting different fracturing fluids into the shell through the pump injection port 1, and testing the pressure of each pressure sensor.
And drawing friction resistance gradient charts at different crack positions with different viscosities, discharge capacities, sand-liquid ratios and particle sizes. The friction plate can determine the corresponding fracturing construction parameters to achieve the aim of increasing the net pressure to the expected level.
Combining actual fracturing construction data, simulating the net pressure and the fracture complexity degree of different fracture positions, providing a new scheme for fracturing construction parameters of other wells at the same layer, and finally continuously improving the fracture complexity and the fracturing transformation effect through evaluating the net pressure and the fracture complexity at different fracture positions.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Finally, it should be noted that the above-mentioned technical solution is only an implementation of the present invention, and it is easy for those skilled in the art to make various modifications or variations based on the principles disclosed in the present invention, not limited to the structure described in the above-mentioned embodiments of the present invention, so that the foregoing description is only preferred, but not limiting.
Claims (12)
1. The utility model provides a physical simulation device that test crack rubs and hinders which characterized in that: the physical simulation device for testing the friction resistance of the crack comprises a shell;
one end of the inner cavity of the shell is a crack inlet end, and the other end of the inner cavity of the shell is a crack outlet end;
the width of the inner cavity of the shell is gradually reduced from the crack inlet end to the crack outlet end;
a pump injection joint is arranged at the crack inlet end of the shell, and an outlet joint is arranged at the crack outlet end of the shell;
the shell is provided with at least one communicating hole, the communicating hole communicates the inner cavity of the shell with the outside of the shell, a sensor connecting pipe is arranged in each communicating hole, and each sensor connecting pipe is connected with a pressure sensor.
2. The physical simulation device for testing the friction of the crack according to claim 1, wherein: the shell comprises a front plate, a rear plate, a top plate, a bottom plate, an inlet arc-shaped plate and an outlet arc-shaped plate;
the front plate is positioned on the front side, the rear plate is positioned on the rear side, the top plate is positioned on the upper side, the bottom plate is positioned on the lower side, the inlet arc-shaped plate is positioned on the left side, and the outlet arc-shaped plate is positioned on the right side;
the front plate, the rear plate, the top plate, the bottom plate, the inlet arc-shaped plate and the outlet arc-shaped plate are enclosed to form the shell.
3. The physical simulation device for testing the friction of the crack according to claim 2, wherein: the inside wall of front bezel, the inside wall of back plate are unevenness's coarse curved surface.
4. The physical simulation device for testing the friction of the crack according to claim 3, wherein: the top plate and the bottom plate are arranged in parallel;
the front plate, the rear plate, the inlet arc plate and the outlet arc plate are all perpendicular to the top plate and the bottom plate.
5. The physical simulation device for testing the friction of the crack according to claim 4, wherein: the front side of the top plate is connected with the upper end of the front plate, and the rear side of the top plate is connected with the upper end of the rear plate;
the front side of the bottom plate is connected with the lower end of the front plate, and the rear side of the bottom plate is connected with the lower end of the rear plate;
crack inlet ends are formed on the left side of the front plate and the left side of the rear plate, and crack outlet ends are formed on the right side of the front plate and the right side of the rear plate;
the distance between the front plate and the rear plate is gradually reduced from the crack inlet end to the crack outlet end.
6. The physical simulation device for testing the friction of the crack according to claim 5, wherein: the lower end of the inlet arc-shaped plate is connected with the left end of the bottom plate, and the upper end of the inlet arc-shaped plate is simultaneously connected with the left end of the top plate and the pump injection joint;
the pump injection joint is positioned above the top plate;
the front end of the inlet arc-shaped plate is connected with the left end of the front plate, and the rear end of the inlet arc-shaped plate is connected with the left end of the rear plate.
7. The physical simulation device for testing the friction of the crack according to claim 6, wherein: the lower end of the outlet arc-shaped plate is connected with the right end of the bottom plate, and the upper end of the outlet arc-shaped plate is simultaneously connected with the right end of the top plate and the outlet joint;
the outlet joint is positioned above the top plate;
the front end of the outlet arc-shaped plate is connected with the right end of the front plate, and the rear end of the outlet arc-shaped plate is connected with the right end of the rear plate.
8. The physical simulation device for testing the friction of the crack according to claim 7, wherein: the radius of the inlet arc is greater than the radius of the outlet arc;
the central angles of the inlet arc plate and the outlet arc plate are both larger than 180 degrees.
9. The physical simulation device for testing the friction of the crack according to claim 8, wherein: the front plate is provided with a plurality of communicating holes, and the central axes of all the communicating holes are vertical to the front plate;
the central axes of all the communication holes are positioned in a plane which is parallel to the bottom plate and the top plate.
10. The physical simulation device for testing the friction of the crack according to claim 9, wherein: all the communication holes are uniformly arranged along the length direction of the front plate.
11. The physical simulation device for testing the friction of the crack according to claim 1, wherein: the sensor connecting pipe is of a cylindrical structure, and one end of the sensor connecting pipe is arranged in the communicating hole and communicated with the communicating hole;
the other end of the sensor connecting pipe is located outside the shell and connected with the pressure sensor.
12. A physical simulation apparatus for testing the frictional resistance of fractures according to any one of claims 1 to 11, wherein: the pump injection joint is connected with the pump injection system, and the outlet joint is connected with the liquid storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202021621892.4U CN212964854U (en) | 2020-08-06 | 2020-08-06 | Physical simulation device for testing friction resistance of crack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021621892.4U CN212964854U (en) | 2020-08-06 | 2020-08-06 | Physical simulation device for testing friction resistance of crack |
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| CN212964854U true CN212964854U (en) | 2021-04-13 |
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| CN202021621892.4U Active CN212964854U (en) | 2020-08-06 | 2020-08-06 | Physical simulation device for testing friction resistance of crack |
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