CN113187471A - Active measurement device and method for cross-fault interface Newtonian force in shale gas exploitation process - Google Patents
Active measurement device and method for cross-fault interface Newtonian force in shale gas exploitation process Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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 OR ROCK 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
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Abstract
The invention provides a device and a method for actively measuring Newtonian force across a fault interface in the shale gas exploitation process, wherein the device comprises an NPR (N-type nitrogen gas) anchor cable and at least one pair of measuring components 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 comprises the following steps: at least one pair of symmetrically arranged measuring assemblies is taken and inserted into the rock hole, so that each pair of symmetrically arranged measuring assemblies are respectively positioned at two sides of the rock fault, and key parameters influencing the fault stability are detected in real time. The measuring device and the measuring method can be used for accurately acquiring key parameters influencing fault stability on a cross-fault interface in a fracturing process of the identified dangerous fault in real time and uninterruptedly, and provide data support for disaster prediction.
Description
Technical Field
The invention belongs to the field of shale gas exploitation and cross-fault interface Newtonian force monitoring, and particularly relates to a cross-fault interface Newtonian force active measurement device and method in a shale gas exploitation process.
Background
With the increasing dependence of external energy resources and the obvious contradiction between environmental protection and social development in China, the shale gas has increasingly prominent position as a novel high-quality clean energy resource. The recoverable resource amount of shale gas in China is 25.08 trillion cubic, the shale gas is the first place in the world, and the development and utilization of the shale gas are highly regarded by the nation and serve as a national energy strategy.
The hydraulic fracturing is an important means for efficient development of shale gas with wide application prospect, the hydraulic fracturing is to squeeze and inject fracturing fluid with higher viscosity into an oil layer by utilizing a ground high-pressure pump through a shaft, when the speed of injecting the fracturing fluid exceeds the absorption capacity of the oil layer, very 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 near the bottom of the well, the oil layer is pressed open and cracks are generated. In the actual hydraulic fracturing process, the microseismic monitoring of the rock stratum is very important and is directly related to the fracturing effect of the hydraulic fracturing. Meanwhile, earthquake disasters related to hydraulic fracturing have become more frequent in recent years. Different from big plate shale gas with stable North America structure, the shale gas reserves in China are mainly concentrated in complex mountainous areas in south such as Sichuan basins, Yu Huo Xiang Qian Gui areas and the like, and the shale gas reserves are strongly transformed into basin structure movement in the land of late ink-finishing period, so that the shale gas geological characteristics of the mountainous areas with obvious 'strong transformation, over-maturity and high stress' are shown. In the mountain shale gas geological environment, the construction pressure of hydraulic fracturing is higher, so that geological disasters such as earthquakes are more frequent and intense.
Therefore, accurate monitoring and early warning of earthquake disasters induced by mountain shale gas hydraulic fracturing are key problems of the national shale gas energy strategy.
At present, the monitoring of earthquake disasters induced by shale gas hydraulic fracturing mostly adopts a microseismic monitoring technology. The microseism monitoring technology is a high-tech informatization underground engineering dynamic monitoring technology, and collects seismic wave signals emitted by rock destruction or rock breakage through a sensor, and simultaneously processes and analyzes the seismic wave signals to obtain information such as the position, magnitude of vibration, energy, seismic moment and the like of vibration, so that the microseism monitoring technology becomes a preferred monitoring technical means for underground geological structure detection.
However, the microseismic monitoring sensors adopted by the existing microseismic monitoring system are all installed underground, so that the following problems exist in the actual use process:
1) the microseismic monitoring sensor has the advantages of high installation difficulty, complex installation mode, time and labor waste and high installation 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 micro-seismic monitoring system is influenced;
3) the microseism monitoring sensor is positioned below the ground, and the long-distance transmission of signals causes large signal attenuation, so that the monitoring precision is influenced;
4) the microseism monitoring lacks the monitoring of key factors such as stress, strain and the like of the internal mechanism of fault activation pregnancy disaster, and the disaster prediction accuracy degree is limited.
Therefore, how to actively measure the cross-fault interface Newtonian force in shale gas exploitation has low cost, high precision, good quality and high fault activation pregnancy disaster detection accuracy, and becomes an important problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a device for actively measuring the cross-fault interface Newtonian force in the shale gas exploitation process and a method for measuring the cross-fault interface Newtonian force by using the device, so as to solve the technical problems that in the prior art of shale gas exploitation, the cross-fault interface Newtonian force is high in active measurement cost, low in precision, incapable of guaranteeing quality and limited in fault activation pregnant disaster detection accuracy.
In order to achieve the above purpose, the invention provides the following technical scheme: the measuring device comprises an NPR (N-type nitrogen gas) anchor cable and at least one pair of measuring components 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;
a through hole is arranged in the vertical direction of the platform mechanism, and a hole is arranged on the side wall of the platform mechanism;
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 hole, and the other side of the extrusion mechanism is provided with a friction part with an 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 a through hole of the platform mechanism through a 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.
In the active measuring device for the cross-fault interface Newtonian force in the shale gas exploitation process, preferably, a protrusion is arranged on one side of the extrusion mechanism, and an elastic unit is fixedly connected to the protrusion.
As mentioned above, in the active measuring device for the cross-fault interface Newtonian force in the shale gas exploitation process, preferably, the left side wall of the platform mechanism is provided with the first hole, the right side wall of the platform mechanism is provided with the second hole, and the extruding mechanism is symmetrically detachably connected to two sides of the platform mechanism through the first hole and the second hole.
In the active measuring device for the cross-fault interface Newtonian force in the shale gas exploitation process, preferably, the protrusion is 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 detachable connection can be met.
As mentioned above, in the shale gas exploitation process, the cross-fault interface newton force active measurement device is preferably configured such that the protrusion is inserted into the first hole or the second hole; the free end of the elastic unit is positioned at the tail of the first hole or the second hole.
As mentioned above, the active measuring device for the cross-fault interface Newtonian force in the shale gas exploitation process preferably has the burr-shaped friction part, so that the friction force of the friction part is increased, and the basic performance of the friction part is improved.
As mentioned above, the active measuring device for the cross-fault interface Newtonian force in the shale gas exploitation process is preferably a spring or rubber.
The method for actively measuring the cross-fault interface Newtonian force in the shale gas exploitation process comprises the following steps:
s1, drilling holes in the rock, wherein the holes penetrate through two sides of the cross-fault interface;
s2, inserting the measuring device into the borehole, and respectively arranging the measuring components symmetrically sleeved on the NPR anchor cables on two sides of a cross-fault interface of the rock, and detecting key parameters influencing fault stability caused by the sliding of the active fault by a sensing mechanism in the measuring device in real time.
Preferably, the measuring device is the active measuring device for the cross-fault interface newton force in the shale gas exploitation process.
In the method for actively measuring the cross-fault interface Newtonian force in the shale gas exploitation process, preferably, the key parameter is Newtonian force.
Has the advantages that:
1. the cross-fault interface Newton force active measurement device is provided with the friction part, and the protrusion is matched with the inner diameter of the first hole or the second hole, so that the extrusion mechanism, the platform mechanism and the hole wall of the rock hole do not slide relatively, and a foundation is laid for accurately and precisely measuring the cross-fault interface Newton force in shale gas exploitation.
2. The measuring method can be used for accurately acquiring key parameters (namely Newton force) influencing fault stability on a cross-fault interface in the fracturing process of the identified dangerous fault in real time continuously, and providing data support for disaster prediction.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic structural diagram of a mid-fault interface Newtonian force active measurement device in shale gas extraction in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a measurement component in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a stage mechanism in embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of an extruding mechanism in embodiment 1 of the present invention
Fig. 5 is a schematic structural view 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 structural diagram of an NPR anchor cable and one of the measurement assemblies according to embodiment 1 of the present invention;
FIG. 8 is a schematic diagram of the position of the measurement assembly in the active measurement of Newtonian force across the fault interface in shale gas exploitation in example 2 of the present invention;
fig. 9 is a schematic structural diagram of a position without relative sliding when newton force is applied to a mid-fault interface in shale gas exploitation actively in embodiment 2 of the present invention.
In the figure: 1. NPR anchor rope, 2, measuring component, 21, platform mechanism, 22, extrusion mechanism, 23, constant resistance mechanism, 24, sensing mechanism, 211, through-hole, 212, first hole, 213, second hole, 221, arch, 222, friction part, 2221, elastic unit, 231, NPR constant resistance body, 232, sleeve, 2321, chuck, 3, fault, 4, rock, 5, pore wall.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only 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 "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
Example 1:
as shown in fig. 1 to fig. 9, the active measurement device for newtonian force across fault interface in shale gas extraction process is shown in fig. 1:
the measuring device comprises an NPR anchor cable 1 and a pair of measuring components 2 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, the platform mechanism 21 has a through hole 211 in the vertical direction, the left portion of the platform mechanism 21 has a first hole 212, and the right portion of the platform mechanism 21 has a second hole 213; specifically, the first hole 212 and the second hole 213 are cylindrical holes and have the same size and length.
As shown in fig. 4, a protrusion 221 is fixedly disposed on one side of the extrusion mechanism 22, a burred friction member 222 is fixedly disposed on the other side of the extrusion mechanism 22, and the friction member 222 is made of rubber or metal (such as iron or steel), so that the friction member 222 has a certain friction force and ensures that the friction member 222 has a certain wear resistance degree, and the contact surface between the friction member 222 and the hole wall 5 is made of super-strong friction material, so that the extrusion mechanism 22 and the hole wall are not relatively displaced; the elastic unit 2221 is fixedly connected to the protrusion 221; the elastic unit 2221 is a spring; the two extrusion mechanisms 22 are symmetrically arranged on two sides of the platform mechanism 21, specifically, two springs are respectively arranged in the first hole 212 and the second hole 213, and the springs are in a pre-compression state, the arrangement of the pre-compression springs facilitates the placement of the newton force measuring device into the holes, and the newton force measuring device is tightly connected with the surrounding rock by cooperating with the extrusion 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 on the protrusion 221 is in a pre-compressed state.
The two sides of the platform mechanism 21 are symmetrically and detachably connected with the extrusion mechanism 22, and the protrusion 221 is inserted into the first hole 212 or the second hole 213; the free end of the elastic unit 2221 is located at the tail (i.e. the end far away from the aperture of the hole) of the first hole 212 or the second hole 213; so that the extrusion mechanism 22 and the platform mechanism 21 do not slide up and down; specifically, the elastic unit 2221 (e.g., a spring) with high strength has one end mounted on the protrusion 221 and the other end compressed against the tail of the first hole 212 or the second hole 213, 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 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 provided with a through hole, and the size of the through hole matches with the thickness of the NPR anchor cable 1, so as to prevent the NPR anchor cable 1 from shaking in the through hole; the sleeve 232 is fixedly provided with a chuck 2321 with a through hole, and the NPR constant resistance body 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 resistance body 231 and is anchored with the NPR constant resistance body 231, so that the NPR anchor cable 1 and the through hole of the NPR constant resistance body 231 are always fixedly connected to prevent the relative displacement of sound; the sensing mechanism 24 is fixedly sleeved below the chuck 2321 outside the sleeve 232, specifically, the sensing mechanism 24 is an extrusion static force dynamic sensor group, and newton force generated after the chuck 2321 is stressed can be remotely transmitted by the static force dynamic sensor group; the platform mechanism 21 is fixedly sleeved outside the sleeve 232 through the through hole 211; the stage mechanism 21 is located below the sensing mechanism 24.
Example 2:
the Newtonian force active measurement device in the embodiment 1 is adopted to measure the Newtonian force of the mid-fault interface in shale gas exploitation, and the specific steps are as follows:
s1, drilling holes in the rock, wherein the holes penetrate through two sides of the cross-fault interface;
s2, inserting the measuring device into the borehole, and respectively arranging the measuring components symmetrically sleeved on the NPR anchor cables on two sides of the cross-fault interface of the rock, and detecting the Newton force affecting the fault stability generated by the sliding of the active fault by a sensing mechanism in the measuring device in real time.
Specifically, in shale gas exploitation, holes are pre-drilled for identified dangerous faults, a plurality of pairs of symmetrically-arranged measuring assemblies 2 of embodiment 1 are connected in series on one NPR anchor cable 1, and the orientations of the measuring assemblies 2 are different due to the symmetrically-arranged measuring assemblies 2, so that the constant-resistance mechanisms 23 are prevented from acting on the measuring assemblies 2 in the same orientation, and the measuring accuracy is improved; inserted into a pre-opened hole 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 in real time continuously, and the series connection method has the advantage of point-domain monitoring.
As shown in fig. 9, the friction member 222 of the pressing mechanism 22 is in contact with the wall surface of the hole wall 5 of the hole in the rock 4, and since the contact surface between the friction member 222 and the hole wall 5 is made of super strong friction material and the protrusion 221 is matched with the inner diameter of the first hole 212 or the second hole 213, no relative sliding occurs among the pressing mechanism 22, the platform mechanism 21 and the hole wall 5 of the hole.
When a disaster occurs, the active fault 3 slides to drive the NPR constant resistance body 231 anchoring the NPR anchor cable 1 to displace in the sleeve 232, and when newton force (pulling force) generated by the sliding of the active fault 3 on the NPR constant resistance body 231 is greater than friction force between the NPR constant resistance body and the sleeve 232, the NPR anchor cable 1 drives the NPR constant resistance body 231 to slide along the sleeve 232 or displace in the sleeve 232; then the NPR constant resistor 231 presses the chuck 2321 to apply a force, and the variable force is remotely transmitted by the sensing mechanism 24, so that the measurement is completed.
In conclusion, the Newton force active measurement device is provided with the friction part 222, and the protrusion 221 is matched with the inner diameter 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 rock hole do not slide relatively, and a foundation is laid for accurately and precisely measuring the Newton force at the mid-fault interface in shale gas exploitation; the Newton force active measurement device can continuously acquire the Newton force generated by the displacement of the active fault 3 in real time, and the point-domain monitoring method is characterized in that a plurality of pairs of symmetrically arranged measurement assemblies 2 are connected in series on one NPR anchor cable 1.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The cross-fault interface Newtonian force active device in the shale gas exploitation process is characterized in that the measuring device comprises an NPR anchor cable and at least one pair of measuring components symmetrically sleeved on the NPR anchor cable;
the measurement assembly includes:
the platform mechanism is provided with a through hole in the vertical direction, and a hole is formed in the side wall of the platform mechanism;
one side of the extrusion mechanism is fixedly connected with an elastic unit, the extrusion mechanism is detachably connected to two sides of the platform mechanism through the elastic unit and the hole, and the other side of the extrusion mechanism is provided with a friction part with an uneven surface;
a constant resistance mechanism comprising an NPR constant resistance body and a sleeve; a chuck with a through hole is fixedly arranged in the middle of the sleeve, 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 passes through the fixed cover of through-hole is located outside the sleeve, platform mechanism is located sensing mechanism's below, sensing mechanism is located the chuck with between the platform mechanism.
2. The cross-fault interface Newtonian force actuating device in the shale gas exploitation process of 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 Newtonian force actuating device across fault interface in shale gas exploitation process as claimed in claim 2, wherein there are two said extrusion mechanisms, there is a first hole on the left side wall of said platform mechanism, there is a second hole on the right side wall of said platform mechanism, and both said extrusion mechanisms are detachably connected with the first hole and the second hole respectively through said elastic unit.
4. A cross-fault interface newtonian force actuator during shale gas recovery as claimed in claim 2, wherein the protrusion matches an inner diameter of the first or second hole and a length of the protrusion is less than an inner length of the first or second hole.
5. A cross-fault interface newtonian force actuation device during shale gas exploitation according to claim 2, wherein the protrusion is inserted into the first hole or the second hole, and a free end of the elastic unit is located at a tail of the first hole or the second hole.
6. The mid-fault interface newtonian force actuator of claim 1, wherein the friction member is burred.
7. The cross-fault interface Newtonian force actuator in shale gas extraction process of claim 1, wherein said elastic unit is spring or rubber.
8. The method for actively measuring the cross-fault interface Newtonian force in shale gas exploitation comprises the following steps:
s1, drilling a hole in the rock, wherein the hole penetrates through two sides of the cross-fault interface;
s2, inserting a measuring device into the drill hole, enabling the measuring components symmetrically sleeved on the NPR anchor cables to be respectively arranged on two sides of a cross-fault interface of the rock, and detecting key parameters influencing fault stability caused by sliding of the active fault in real time by a sensing mechanism in the measuring device.
9. The active measurement method for Newtonian force across fault interface in shale gas exploitation according to claim 8, wherein the measurement device is an active measurement device for Newtonian force across fault interface in shale gas exploitation according to any one of claims 1 to 7.
10. The active measurement method of Newtonian forces across fault interfaces during shale gas production according to claim 8, wherein the key parameter is Newtonian 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 |
Applications Claiming Priority (1)
| 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 |
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| CN113187471A true CN113187471A (en) | 2021-07-30 |
| CN113187471B CN113187471B (en) | 2023-06-06 |
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| CN202110456147.1A Active 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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| Country | Link |
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| CN (1) | CN113187471B (en) |
| LU (1) | LU501939B1 (en) |
| WO (1) | WO2022057947A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022057947A1 (en) * | 2021-04-26 | 2022-03-24 | 中国矿业大学(北京) | Device and method for active measurement of cross-fault interface newton force in shale gas mining process |
| CN117889791A (en) * | 2024-03-13 | 2024-04-16 | 中国矿业大学(北京) | Underground engineering fault slip monitoring system and control method |
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| CN113187471B (en) | 2023-06-06 |
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