CN113187471B - Active measurement device and method for Newton force crossing fault interface in shale gas exploitation process - Google Patents
Active measurement device and method for Newton force crossing fault interface in shale gas exploitation process Download PDFInfo
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- CN113187471B CN113187471B CN202110456147.1A CN202110456147A CN113187471B CN 113187471 B CN113187471 B CN 113187471B CN 202110456147 A CN202110456147 A CN 202110456147A CN 113187471 B CN113187471 B CN 113187471B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/007—Measuring stresses in a pipe string or casing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/006—Measuring wall stresses in the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
Abstract
The invention provides a device and a method for actively measuring Newton force across a fault interface in a shale gas exploitation process, wherein the measuring device comprises an NPR anchor cable and at least one measuring component which is symmetrically sleeved on the NPR anchor cable; the measuring assembly comprises a platform mechanism, an extrusion mechanism, a constant resistance mechanism and a sensing mechanism. The measuring method of the invention comprises the following steps: and (3) taking at least one pair of symmetrically arranged measuring assemblies, inserting the measuring assemblies into the rock holes, and enabling each pair of symmetrically arranged measuring assemblies to be respectively positioned at two sides of a rock fault, so as to detect key parameters affecting the fault stability in real time. The measuring device and the measuring method can accurately collect key parameters affecting fault stability on a cross-fault interface in the fracturing process of the identified dangerous faults in real time without interruption, and provide data support for disaster prediction.
Description
Technical Field
The invention belongs to the field of shale gas exploitation and Newton force monitoring across fault interfaces, and particularly relates to an active measurement device and method for Newton force across fault interfaces in the shale gas exploitation process.
Background
Along with the increase of the dependence on external energy sources, the contradiction between environmental protection and social development is prominent, and the shale gas is increasingly prominent as a novel high-quality clean energy source. The recoverable resource amount of the shale gas in China is 25.08 trillion cubes, the world is first, and the shale gas is developed and utilized to obtain high importance of the country and is used as a national energy strategy.
Hydraulic fracturing is an important means for efficient development of shale gas with wide application prospect, and is characterized in that a high-pressure ground pump is utilized and a fracturing fluid with higher viscosity is extruded into an oil layer through a shaft, when the speed of injecting the fracturing fluid exceeds the absorption capacity of the oil layer, high pressure is formed on the oil layer at the bottom of a well, and when the pressure exceeds the fracture pressure of rock of the oil layer nearby the bottom of the well, the oil layer is pressed open and cracks are generated. In the actual hydraulic fracturing process, microseismic monitoring of the rock stratum is very important, and the fracturing effect of hydraulic fracturing is directly related. Meanwhile, in recent years, earthquake disasters associated with hydraulic fracturing have become more frequent. Unlike large plate shale gas with stable North America structure, the shale gas reserves of China are mainly concentrated in southern complicated mountain areas such as Sichuan basin, yu Hu Gui area and the like, and the mountain shale gas geological features of obvious 'strong transformation, overmaturation and high stress' are shown due to the strong transformation of mountain-making basin structure movement caused by late printing support period Liu Na. Under the geological environment of mountain shale gas, the construction pressure of hydraulic fracturing is higher, and geological disasters such as earthquakes are more frequent and strong.
Therefore, accurate monitoring and early warning of mountain shale gas hydraulic fracturing induced earthquake disasters is a key difficult problem of the national shale gas energy strategy.
At present, a microseism monitoring technology is mostly adopted for monitoring shale gas hydraulic fracturing induced earthquake disasters. The microseismic monitoring technology is a high-tech informationized underground engineering power monitoring technology, and is characterized in that a sensor is used for collecting and acquiring seismic wave signals emitted by rock mass damage or rock fracture, and meanwhile, the seismic wave signals are processed and analyzed, so that information such as the position, the magnitude, the energy and the seismic moment of vibration is obtained, and the microseismic monitoring technology is the preferred monitoring technology means for detecting the underground geological structure.
However, since the microseismic monitoring sensors adopted by the existing microseismic monitoring system are all installed underground, the following problems exist in the actual use process:
1) The microseismic monitoring sensor is high in mounting difficulty, complex in mounting mode, time-consuming, labor-consuming and high in mounting cost;
2) The installation quality is difficult to ensure, and the installed sensor is easy to fall off, so that the normal monitoring process of the microseismic monitoring system is affected;
3) The microseismic monitoring sensor is positioned below the ground, and the long-distance transmission of signals of the microseismic monitoring sensor causes large signal attenuation, so that the monitoring precision is influenced;
4) The microseismic monitoring lacks monitoring on key factors such as stress, strain and the like of an intrinsic mechanism of fault activation pregnancy and disaster, and the disaster prediction accuracy is limited.
Therefore, how to actively measure Newton force across a fault interface in shale gas exploitation has the advantages of low cost, high precision, good quality and high detection accuracy on fault activation pregnancy and disaster, and becomes an important problem to be solved currently.
Disclosure of Invention
The invention aims to provide a device for actively measuring Newton force across a fault interface in a shale gas exploitation process and a method for measuring Newton force across the fault interface in the shale gas exploitation process by using the device, so as to solve the technical problems that in the shale gas exploitation prior art, newton force across the fault interface is actively measured with high cost, low precision, no guarantee of quality and limited detection accuracy for fault activation and pregnancy.
In order to achieve the above object, the present invention provides the following technical solutions: the device comprises an NPR anchor cable and at least one measuring component which is symmetrically sleeved on the NPR anchor cable;
the measuring assembly comprises a platform mechanism, an extrusion mechanism, a constant resistance mechanism and a sensing mechanism;
the vertical direction of the platform mechanism is provided with a through hole, and the side wall of the platform mechanism is provided with a hole;
one side of the extrusion mechanism is fixedly connected with an elastic unit, the extrusion mechanism and the platform mechanism can be detachably connected through the elastic unit and the holes, and the other side of the extrusion mechanism is provided with a friction part with uneven surface;
the constant resistance mechanism comprises an NPR constant resistance body and a sleeve; the middle part of the sleeve is fixedly provided with a chuck with a through hole, and the NPR constant resistance body is movably connected in the sleeve above the chuck; the NPR anchor cable penetrates through the NPR constant-resistance body and is anchored with the NPR constant-resistance body, and the constant-resistance mechanism is fixedly connected inside the through hole of the platform mechanism through the sleeve;
the sensing mechanism is fixedly sleeved outside the sleeve below the chuck; the platform mechanism is fixedly sleeved outside the sleeve through the through hole; the platform mechanism is positioned below the sensing mechanism, and the sensing mechanism is positioned between the chuck and the platform mechanism.
As mentioned above, in the shale gas exploitation process, the Newton force active measurement device crossing the fault interface is preferably provided with a protrusion on one side of the extrusion mechanism, and an elastic unit is fixedly connected on the protrusion.
As mentioned above, in the shale gas exploitation process, the Newton force active measurement device crossing the fault interface preferably has a first hole on the left side wall of the platform mechanism, a second hole on the right side wall of the platform mechanism, and the extrusion mechanism is symmetrically and detachably connected to two sides of the platform mechanism through the first hole and the second hole.
As mentioned above, in the shale gas exploitation process, the Newton force active measurement device crossing the fault interface preferably has the protrusion matched with the inner diameter of the first hole or the second hole, and the length of the protrusion is smaller than the inner length of the first hole or the second hole, so that the protrusion can be inserted into the first hole or the second hole, and the basic condition of the detachable connection can be satisfied.
As mentioned above, the Newton force active measuring device crossing the fault interface in the shale gas exploitation process is preferably inserted into the first hole or the second hole by the protrusion; the free end of the elastic unit is positioned at the tail of the first hole or the second hole.
As described above, in the shale gas exploitation process, the Newton force active measurement device crossing the fault interface preferably has the friction part in the shape of burrs, so that the friction force of the friction part is increased, and the basic performance of the friction part is improved.
As described above, the Newton force active measurement device crossing the fault interface in the shale gas exploitation process, preferably, the elastic unit is a spring or rubber.
As described above, the Newton force active measurement method crossing the fault interface in the shale gas exploitation process comprises the following steps:
s1, drilling holes in rock, wherein the drilling holes penetrate through two sides of a cross-fault interface;
s2, inserting the measuring device into the drill hole, and enabling the measuring assemblies symmetrically sleeved on the NPR anchor cable to be respectively arranged on two sides of a rock cross-fault interface, wherein key parameters affecting fault stability, which are generated by sliding of a movable fault, are detected in real time by a sensing mechanism in the measuring device.
As mentioned above, the measuring device is preferably the active measuring device for Newton force across the fault interface in the shale gas exploitation process.
As described above, the Newton force active measurement method crossing the fault interface in the shale gas exploitation process is preferable, and the key parameter is Newton force.
The beneficial effects are that:
1. the friction component is arranged in the active measuring device for Newton force across the fault interface, and the protrusions are matched with the inner diameters of the first holes or the second holes, so that the extruding mechanism, the platform mechanism and the wall of the rock holes do not slide relatively, and a foundation is laid for accurately and precisely measuring Newton force across the fault interface in shale gas exploitation.
2. The measuring method can accurately collect key parameters (namely Newton force) influencing fault stability on a cross fault interface in the fracturing process of the identified dangerous faults in real time without interruption, and provides data support for disaster prediction.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Wherein:
FIG. 1 is a schematic structural diagram of an active measurement device for Newton force across a fault interface in shale gas exploitation in embodiment 1 of the invention;
FIG. 2 is a schematic view showing the structure of a measuring assembly according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a platform mechanism according to embodiment 1 of the present invention;
FIG. 4 is a schematic view showing the structure of an extrusion mechanism according to embodiment 1 of the present invention
FIG. 5 is a schematic structural diagram of a constant resistance mechanism in embodiment 1 of the present invention;
FIG. 6 is a schematic cross-sectional view of a constant resistance mechanism in embodiment 1 of the present invention;
FIG. 7 is a schematic view of the construction of NPR cable bolt and one of the measurement assemblies of example 1 of this invention;
FIG. 8 is a schematic diagram showing the position of the measuring assembly in example 2 of the present invention when actively measuring Newtonian forces across a fault interface in the exploitation of shale gas;
fig. 9 is a schematic diagram of a position structure without relative sliding when actively measuring newtonian force across a fault interface in shale gas exploitation in embodiment 2 of the present invention.
In the figure: 1. NPR anchor cable, 2, measurement assembly, 21, platform mechanism, 22, extrusion mechanism, 23, constant resistance mechanism, 24, sensing mechanism, 211, through hole, 212, first hole, 213, second hole, 221, protrusion, 222, friction component, 2221, elastic unit, 231, NPR constant resistance body, 232, sleeve, 2321, chuck, 3, fault, 4, rock, 5, pore wall.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
Example 1:
as shown in fig. 1 to 9, the newton force active measurement device crossing the fault interface in the shale gas exploitation process is as shown in fig. 1:
the measuring device comprises an NPR anchor cable 1 and a measuring assembly 2 which is symmetrically sleeved on the NPR anchor cable 1;
as shown in fig. 2, the measuring assembly 2 includes a platform mechanism 21, a pressing mechanism 22, a constant resistance mechanism 23, and a sensing mechanism 24;
as shown in fig. 3, a through hole 211 is formed in the vertical direction of the platform mechanism 21, a first hole 212 is formed in the left part of the platform mechanism 21, and a second hole 213 is formed in the right part of the platform mechanism 21; specifically, the first hole 212 and the second hole 213 are cylindrical holes, and have equal size and length.
As shown in fig. 4, a protrusion 221 is fixedly arranged on one side of the extrusion mechanism 22, a burr-shaped friction part 222 is fixedly arranged on the other side of the extrusion mechanism, and the friction part 222 is made of rubber or metal (such as iron or steel), so that the friction part 222 has a certain friction force and ensures that the friction part 222 has a certain wear resistance, and the contact surface of the friction part 222 and the hole wall 5 adopts a super-strong friction material, so that the extrusion mechanism 22 and the hole wall do not generate relative displacement; the elastic unit 2221 is fixedly connected to the protrusion 221; the elastic unit 2221 is a spring; the two pressing mechanisms 22 are symmetrically arranged on two sides of the platform mechanism 21, specifically, two springs are respectively located in the first hole 212 and the second hole 213, the springs are in a precompressed state, and the precompressed springs are arranged so as to be convenient for placing the Newton force measuring device into the holes and to be in close connection with the surrounding rock under the cooperation of the pressing mechanisms 22.
The protrusion 221 is matched with the inner diameter of the first hole 212 or the second hole 213, and the length of the protrusion 221 is smaller than the inner length of the first hole 212 or the second hole 213 so that the spring fixed to the protrusion 221 is in a pre-compressed state.
The two sides of the platform mechanism 21 are symmetrically connected with the extrusion mechanism 22 in a detachable way, and the protrusions 221 are inserted into the first holes 212 or the second holes 213; the free end of the elastic unit 2221 is located at the tail of the first hole 212 or the second hole 213 (i.e. the end far away from the hole orifice); the extrusion mechanism 22 and the platform mechanism 21 do not slide up and down; specifically, an elastic unit 2221 (e.g., a spring) having high strength is mounted on the protrusion 221 at one end, and is compressed against the tail of the first hole 212 or the second hole 213 at one end, so as to ensure that the pressing mechanism 22 and the platform mechanism 21 do not slide up and down.
As shown in fig. 5 and fig. 6, the constant resistance mechanism 23 includes an NPR constant resistance body 231 and a sleeve 232, specifically, the NPR constant resistance body 231 is a frustum-shaped constant resistance body with a through hole, the size of the through hole is matched with the thickness of the NPR anchor cable 1, so that the NPR anchor cable 1 is prevented from shaking in the through hole; a chuck 2321 with a through hole is fixedly arranged on the sleeve 232, and the npr constant resistor 231 is detachably connected above the chuck 2321 in the sleeve 232.
As shown in fig. 7, the NPR anchor cable 1 passes through the through hole of the NPR constant resistor 231 and is anchored with the NPR constant resistor 231, so that the NPR anchor cable 1 and the through hole of the NPR constant resistor 231 are always fixedly connected, and the sounding relative displacement is prevented; the sensing mechanism 24 is fixedly sleeved below the chuck 2321 outside the sleeve 232, specifically, the sensing mechanism 24 is a static force sensor group, and newton force generated after the chuck 2321 is stressed can be remotely transmitted by the static force sensor group; the platform mechanism 21 is fixedly sleeved outside the sleeve 232 through the through hole 211; the platform mechanism 21 is located below the sensing mechanism 24.
Example 2:
the Newton force active measuring device of the embodiment 1 is adopted to measure the Newton force of the cross-fault interface in shale gas exploitation, and the specific steps are as follows:
s1, drilling holes in rock, wherein the drilling holes penetrate through two sides of a cross-fault interface;
s2, inserting the measuring device into the drill hole, and enabling the measuring assemblies symmetrically sleeved on the NPR anchor cable to be respectively arranged on two sides of a rock cross-fault interface, wherein Newton forces affecting fault stability and generated by sliding of the movable faults are detected in real time through a sensing mechanism in the measuring device.
Specifically, in shale gas exploitation, holes are formed in advance for the identified dangerous faults, a plurality of pairs of symmetrically arranged measuring assemblies 2 of the embodiment 1 are connected in series on one NPR anchor cable 1, and the symmetrically arranged measuring assemblies 2 enable the orientations of the measuring assemblies 2 to be different, so that constant resistance mechanisms 23 are prevented from acting on the measuring assemblies 2 with the same orientation, and measurement accuracy is improved; inserting into the pre-opened holes of the rock, as shown in fig. 8, so that each pair of symmetrically arranged measuring assemblies 2 are respectively positioned at two sides of the fault 3; newton force can be collected continuously in real time, and the series connection method has the advantage of point domain monitoring.
As shown in fig. 9, the friction part 222 of the extrusion mechanism 22 is contacted with the wall surface of the hole wall 5 of the hole on the rock 4, and the contact surface of the friction part 222 and the hole wall 5 adopts super strong friction material, and the inner diameter of the protrusion 221 is matched with that of the first hole 212 or the second hole 213, so that the extrusion mechanism 22, the platform mechanism 21 and the hole wall 5 of the hole do not slide relatively.
When a disaster occurs, the movable layer 3 slides, so that the NPR constant resistance body 231 anchoring the NPR anchor cable 1 is driven to displace in the sleeve 232, and when Newton force (pulling force) generated by the sliding of the movable layer 3 received by the NPR constant resistance body 231 is larger than friction force between the NPR constant resistance body 231 and the sleeve 232, the NPR anchor cable 1 slides along the sleeve 232 or displaces in the sleeve 232 along the NPR constant resistance body 231; further, the NPR constant resistor 231 presses the chuck 2321 to bear force, and the force is remotely transmitted by the sensing mechanism 24, so that measurement is completed.
In summary, the active newton force measuring device of the present invention is provided with the friction member 222, and the protrusion 221 is matched with the inner diameter of the first hole 212 or the second hole 213, so that there is no relative sliding among the extrusion mechanism 22, the platform mechanism 21 and the hole wall 5 of the rock hole, which lays a foundation for accurately and precisely measuring newton force across a fault interface in shale gas exploitation; the Newton force active measuring device can collect Newton force generated by displacement of the movable fault 3 continuously in real time, and the method of connecting a plurality of pairs of symmetrically arranged measuring assemblies 2 in series on one NPR anchor cable 1 has the advantage of point domain monitoring.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The Newton force active measuring device is inserted into a drill hole in the shale gas exploitation process, and comprises an NPR anchor cable and at least one pair of measuring assemblies symmetrically sleeved on the NPR anchor cable, wherein the measuring assemblies symmetrically sleeved on the NPR anchor cable and the NPR anchor cable are respectively arranged on two sides of a rock cross-fault interface;
the measurement assembly includes:
the platform mechanism is provided with a through hole in the vertical direction, and the side wall of the platform mechanism is provided with a hole;
the extrusion mechanism is fixedly connected with an elastic unit on one side of the extrusion mechanism, the extrusion mechanism is detachably connected to two sides of the platform mechanism through the elastic unit and the holes, and a friction part with uneven surface is arranged on the other side of the extrusion mechanism;
the constant-resistance mechanism comprises an NPR constant-resistance body and a sleeve; the NPR constant resistance body is movably connected in the sleeve above the chuck, a through hole is formed in the interior of the NPR constant resistance body, the size of the through hole is matched with the thickness of an NPR anchor cable, the NPR anchor cable passes through the through hole of the NPR constant resistance body and is anchored with the NPR constant resistance body, and the constant resistance mechanism is fixedly connected in the interior of the through hole of the platform mechanism through the sleeve;
the sensing mechanism is a static force extrusion power sensor group and is fixedly sleeved outside the sleeve below the chuck; the platform mechanism is fixedly sleeved outside the sleeve through the through hole, the platform mechanism is positioned below the sensing mechanism, and the sensing mechanism is positioned between the chuck and the platform mechanism.
2. The active measurement device for Newton force crossing fault interfaces in shale gas exploitation according to claim 1, wherein a protrusion is arranged on one side of the extrusion mechanism, and an elastic unit is fixedly connected to the protrusion.
3. The active measurement device for Newton force across a fault interface in shale gas exploitation process according to claim 2, wherein two extrusion mechanisms are arranged, a first hole is formed in the left side wall of the platform mechanism, a second hole is formed in the right side wall of the platform mechanism, and the two extrusion mechanisms are detachably connected with the first hole and the second hole through the elastic units respectively.
4. The active measurement device of Newton force across a fault interface in a shale gas extraction process according to claim 3, wherein the protrusion is matched with an inner diameter of the first hole or the second hole, and a length of the protrusion is smaller than an inner length of the first hole or the second hole.
5. A device for actively measuring newton force across a fault interface during shale gas extraction as claimed in claim 3, wherein said protrusion is inserted into said first or second hole, and the free end of said elastic element is located at the tail of said first or second hole.
6. The active measurement device of newton force across a fault interface during shale gas extraction as claimed in claim 1, wherein the friction member is burr-like.
7. The active measurement device for newtonian force across a fault interface in shale gas mining process according to claim 1, wherein the elastic unit is a spring or rubber.
8. The Newton force active measurement method across the fault interface in the shale gas exploitation process comprises the following steps:
s1, drilling holes in rock, wherein the holes penetrate through two sides of a cross-fault interface;
s2, inserting a measuring device into the borehole, and enabling measuring assemblies symmetrically sleeved on the NPR anchor cable to be respectively arranged on two sides of a rock cross-fault interface, wherein a sensing mechanism in the measuring device detects key parameters affecting fault stability, which are generated by sliding of a movable fault, in real time;
the measuring device is an active measuring device for Newton force crossing a fault interface in the shale gas exploitation process according to any one of claims 1-7.
9. The method for actively measuring newton force across a fault interface during shale gas extraction of claim 8, wherein the key parameter is newton force.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110456147.1A CN113187471B (en) | 2021-04-26 | 2021-04-26 | Active measurement device and method for Newton force crossing fault interface in shale gas exploitation process |
| LU501939A LU501939B1 (en) | 2021-04-26 | 2021-09-30 | Device and method for active measurement of cross-fault interface newton force in shale gas mining process |
| PCT/CN2021/122372 WO2022057947A1 (en) | 2021-04-26 | 2021-09-30 | Device and method for active measurement of cross-fault interface newton force in shale gas mining process |
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| CN202110456147.1A CN113187471B (en) | 2021-04-26 | 2021-04-26 | Active measurement device and method for Newton force crossing fault interface in shale gas exploitation process |
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| CN113187471A CN113187471A (en) | 2021-07-30 |
| CN113187471B true CN113187471B (en) | 2023-06-06 |
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| CN (1) | CN113187471B (en) |
| LU (1) | LU501939B1 (en) |
| WO (1) | WO2022057947A1 (en) |
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| CN113187471B (en) * | 2021-04-26 | 2023-06-06 | 中国矿业大学(北京) | Active measurement device and method for Newton force crossing fault interface in shale gas exploitation process |
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- 2021-04-26 CN CN202110456147.1A patent/CN113187471B/en active Active
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| CN112228132A (en) * | 2020-09-17 | 2021-01-15 | 中国矿业大学(北京) | Flexible isolation structure of cross-section tunnel and rock mass large deformation control method |
| CN112228131A (en) * | 2020-09-17 | 2021-01-15 | 中国矿业大学(北京) | Cross-section tunnel flexible isolation structure and engineering rock mass large deformation disaster control method |
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| WO2022057947A1 (en) | 2022-03-24 |
| CN113187471A (en) | 2021-07-30 |
| LU501939B1 (en) | 2022-11-02 |
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