CN113216912A - Perforating gun for reducing mine earthquake grade and method for reducing mine earthquake grade through hydraulic fracturing - Google Patents
Perforating gun for reducing mine earthquake grade and method for reducing mine earthquake grade through hydraulic fracturing Download PDFInfo
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- CN113216912A CN113216912A CN202110309742.2A CN202110309742A CN113216912A CN 113216912 A CN113216912 A CN 113216912A CN 202110309742 A CN202110309742 A CN 202110309742A CN 113216912 A CN113216912 A CN 113216912A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 27
- 239000011707 mineral Substances 0.000 claims abstract description 27
- 238000005553 drilling Methods 0.000 claims description 44
- 230000001360 synchronised effect Effects 0.000 claims description 19
- 230000035939 shock Effects 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 2
- 230000007547 defect Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000005065 mining Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000002635 electroconvulsive therapy Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a perforating gun for reducing mineral earthquake grade and a method for reducing mineral earthquake grade through hydraulic fracturing. In order to overcome the defects of the prior art, the perforating gun for reducing the mine earthquake level comprises a gun barrel and perforating bullet fixing seats, wherein the launching holes and the corresponding perforating bullets are arranged in pairs in a back-to-back mode, the axial leads of the opposite perforating bullets are overlapped and vertically intersected with the axial lead of the gun barrel, and the axial leads of all the launching holes and the perforating bullets are distributed on a vertical plane in parallel. The invention also relates to a method for reducing the mine earthquake grade by hydraulic fracturing. The perforating gun for reducing the mine earthquake level has the advantages of simple structure and convenience in use, and the method for reducing the mine earthquake level by hydraulic fracturing can effectively split a plurality of hydraulic fracturing surfaces parallel to the working surface on the top plate of the key layer, so that the top plate can be orderly collapsed when the working surface passes by, and the mine earthquake level is effectively reduced.
Description
Technical Field
The invention relates to a perforating gun for reducing mineral earthquake grade and a method for reducing mineral earthquake grade through hydraulic fracturing.
Background
With the increasing of the mining intensity and depth of coal mines, the extremely thick stratum on the upper part of the goaf frequently generates ore shock, which brings great challenges to coal mine mining, so that the ore shock treatment is widely concerned by governments, society and enterprises. Therefore, a process for reducing the mine earthquake grade by a ground pore-forming hydraulic fracturing method is provided.
According to data research, the existing mine earthquake management technology is mainly used for prevention and control management by adjusting coal mining process parameters, directional tunnel fracturing, directional tunnel blasting and other methods.
In the research of the test for treating the hard roof by the directional hydraulic fracturing technology, the construction process of the roadway directional hydraulic fracturing technology and the control effect on the collapse of the hard roof are researched. The roadway directional hydraulic fracturing technology is limited by roadway space, small in equipment and limited in fracturing scale, and is only effective on hard strata within dozens of meters above a roof.
The patent CN 106437711A discloses a method for preventing and controlling impact type mine earthquake by digging a pressure relief tunnel in a mining stop line area of a mine earthquake protection area and carrying out drilling blasting on the coal wall of a working face. CN 106150503a, CN 111058819 a, CN 109339786B, CN 108999636 a.
The mine earthquake control technology has limitations and cannot solve the problem of broken mine earthquake with a huge thick hard stratum which is several hundred meters away from the immediate roof.
The Chinese patent with the granted publication number of CN 106150503B discloses a method for treating a hard roof by hydraulic fracturing. The invention discloses a method for treating a hard roof by hydraulic fracturing, which comprises the following steps: 1) defining the stress state of the hard top plate to be fractured; 2) selecting two corresponding different fracturing schemes according to the obtained stress state; 3) selecting a drilling position and drilling parameters and constructing a fracturing drill hole; 4) hydraulic fracturing of the hard roof is performed.
The invention has the advantage that two corresponding different fracturing schemes can be adopted according to the specific situation of different ground stress. Compared with the traditional fracturing method, the method is considered more comprehensively, the fracturing method is more flexible to select, the fracturing operation is more targeted, the formation of the fracturing crack which is beneficial to weakening the hard top plate covered on the coal bed is more convenient, the hard top plate is weakened, the hard top plate is broken timely, the pressure step of the top plate is shortened, the strong mine pressure display of the working face is reduced, and the underground safe production of the coal mine is facilitated.
The invention selects two corresponding different fracturing schemes according to the obtained stress state: if the stress state of the hard top plate to be fractured is that the horizontal stress is larger than the vertical stress, a fracturing target layer is divided into multiple layers for fracturing by adopting a vertical drilling hydraulic jet layered fracturing method, as shown in the attached figure 1-2 of the specification;
and if the stress state of the hard top plate to be fractured is that the horizontal stress is smaller than the vertical stress, fracturing the target layer by adopting an L-shaped drilling hydraulic jet staged fracturing method, as shown in the attached figures 3-5 of the specification.
Although two schemes of vertical drilling fracturing and L-shaped drilling fracturing are provided according to the difference between the horizontal stress and the vertical stress, the perforation points to all directions, the same concentrated vertical split joint cannot be generated, and the fracturing effect needs to be further improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a perforating gun for reducing the mineral earthquake grade and a method for reducing the mineral earthquake grade by hydraulic fracturing.
In order to solve the technical problem, the perforating gun for reducing the mine earthquake grade comprises a gun barrel and perforating bullet fixing seats, wherein a plurality of launching holes are formed in the gun barrel, the perforating bullet fixing seats are arranged in the gun barrel, a perforating bullet is arranged on the perforating bullet fixing seat opposite to each launching hole, and the axis of each perforating bullet is superposed with the axis of the corresponding launching hole, and the perforating gun is characterized in that: the launching holes and the corresponding perforating bullets are back to each other, the axial lines of the back perforating bullets are overlapped and vertically intersected with the axial line of the gun barrel, and the axial lines of all the launching holes and the perforating bullets are distributed on a vertical surface in parallel.
When the perforating bullet gun is used, all the axes of the launching holes are arranged on the same vertical surface as much as possible and are triggered simultaneously, so that perforating bullets are shot in a centralized mode on one vertical surface, and the generated trajectories are also distributed on one vertical surface. So design, when helping hydraulic fracturing, the fracture mainly extends along the vertical face of predesigned.
As optimization, the distance between the axial leads of the transmitting holes adjacent to the upper part and the lower part of the key is controlled within the range of 0.4-0.6 m, and 0.5 m is preferred. By adopting the design, the practice proves that the distance range has good effect, and the optimal distance range is 0.5 m.
The method for reducing the mine earthquake grade by hydraulic fracturing comprises the following steps:
determining the positions of each key layer: determining the positions of the key layers and the isolation layers with frequent occurrence of the mineral earthquake in the stratum through the measurement data of the mineral layers and the geological drilling information,
planning the vertical drilling position: the vertical drilling holes are arranged on the ground vertically and horizontally, wherein the distance between the vertical drilling holes which are adjacent horizontally is controlled within the range of 100-120 m, the distance between the vertical drilling holes which are adjacent vertically is controlled within the range of 120-150 m,
drilling, casing running and cement slurry injection: drilling according to the vertical drilling position obtained in the second step, wherein each drilling hole is internally provided with a sleeve, and then, injecting slurry between each sleeve and the wall of the drilling hole where the sleeve is located until all the vertical drilling, casing running and slurry injection work are completed;
sequentially carrying out perforation and hydraulic fracturing on each key layer from bottom to top, wherein the method comprises the following steps: after the cement paste is solidified, dividing each casing into a plurality of transverse rows,
selecting two or more transversely adjacent casings as synchronous perforation fracturing groups from one end of each row of casings, sequentially and respectively installing a lower sealer and the perforation guns for reducing the mineral shock grade into each casing of the same synchronous perforation fracturing group, enabling the perforation guns for reducing the mineral shock grade to be just positioned in the key layer of the lowest layer, enabling the axial lead of each emission hole on at least one side of the perforation guns for reducing the mineral shock grade and the axial lead of the transversely adjacent casing to be on the same vertical plane, simultaneously triggering the perforation guns for reducing the mineral shock grade to carry out perforation, then installing sealers into corresponding casings, then connecting and using hydraulic fracturing equipment for each casing of the synchronous perforation fracturing groups to carry out hydraulic fracturing,
and then, according to the method, installing a sealer and the perforating gun for reducing the mineral shock level in the key layer of the upper layer where the synchronous perforation fracturing group is located, perforating, installing the sealer, and then performing hydraulic fracturing operation until the perforation and hydraulic fracturing operation of each sleeve of the same synchronous perforation fracturing group in each key layer is completed.
Then selecting two or more transversely adjacent casings as the next synchronous perforation and fracturing group in the same row of casings, repeating the method until the perforation and hydraulic fracturing operations of all the casings in the same row are completed,
fifthly, selecting the next row of casings, repeating the step IV, and performing perforation and hydraulic fracturing operation until the perforation and hydraulic fracturing operation of all the casings is completed.
The invention can simultaneously carry out perforation on the same key layer of the same synchronous perforation fracturing group, and the generated trajectory is correspondingly distributed on the vertical surface. The above ballistic and vertical drilling already performed a preliminary directional destruction of the rock within the respective key layer. Then hydraulic fracturing is carried out simultaneously, and the produced hydraulic fracture mainly extends along the corresponding vertical surface and produces large vertical fractures on two sides of the corresponding sleeve like cutter axe fracture. By the design, the generated cracks can be distributed along the required direction as far as possible, so that the hydraulic working capacity is reduced as little as possible, and the mine earthquake grade is reduced to the maximum extent.
And (4) as optimization, measuring the stress of the rock of each key layer in the horizontal direction during the first step, and selecting the direction with high stress as the transverse direction in the second step. By the design, a vertical and transverse fracturing surface is generated when hydraulic fracturing is facilitated.
Preferably, in the second step, the transverse direction of the vertical drilling hole is parallel to the direction of the underground working face. Due to the design, the top plate above the goaf can be orderly collapsed in the process of pushing the working face conveniently.
As optimization, the method also comprises the following steps: and in the working face advancing process, the mine earthquake is monitored in real time, and if a high-grade mine earthquake event occurs, the number and the density of vertical drilling holes need to be supplemented and encrypted, and then the operations of perforating and hydraulic fracturing are carried out. The design is suitable for being used in complicated and changeable geological conditions.
The perforating gun for reducing the mine earthquake level has the advantages of simple structure and convenience in use, and the method for reducing the mine earthquake level by hydraulic fracturing can effectively split a plurality of hydraulic fracturing surfaces parallel to the working surface on the top plate of the key layer, so that the top plate can be orderly collapsed when the working surface passes by, and the mine earthquake level is effectively reduced.
Drawings
The perforating gun for reducing the mine earthquake grade and the method for reducing the mine earthquake grade by hydraulic fracturing are further described by combining the attached drawings as follows:
FIG. 1 is a schematic diagram of the configuration of the perforating gun for reducing the level of mine earthquakes of the present invention;
FIG. 2 is a schematic sectional structure (I) of the fourth step of the method for reducing the level of mine earthquake by hydraulic fracturing (i.e. cutting along the vertical surface of the axis passing through the sleeve and the axis of the emission hole);
FIG. 3 is a schematic sectional structure (II) of the fourth step of the method for reducing the level of mine earthquake by hydraulic fracturing (the second step is a cutting along the vertical surface of the shaft axis passing through the sleeve and the shaft axis of the emission hole);
FIG. 4 is a schematic structural diagram of the fifth step of the method for reducing the mine earthquake grade by hydraulic fracturing.
In the figure: the gun barrel is 1, the perforating bullet fixing seat is 2, the firing hole is 3, the perforating bullet is 4, the key layer is 5, the isolation layer is 6, the goaf is 7, the vertical drilling hole is 8, the casing is 9, the lower sealer is 10, the upper sealer is 11, the working face is 12, the trajectory generated after the perforating bullet is fired is 13, and the crack is 14.
Detailed Description
The first implementation mode comprises the following steps: as shown in fig. 1, this reduce perforating gun for ore deposit shake grade includes barrel 1 and perforating bullet fixing base 2, be equipped with a plurality of firing holes 3 on the barrel 1, the perforating bullet fixing base sets up in barrel 1, is equipped with a perforating bullet 4 on every 3 dead perforating bullet fixing base 2 of firing hole, and the coincidence of this 4 axial leads of perforating bullet and the axial lead of the firing hole 3 that corresponds, its characterized in that: the launching holes 3 and the corresponding perforating bullets 4 are back to back in pairs, the axial leads of the back perforating bullets 4 are overlapped and vertically intersected with the axial lead of the gun barrel 1, and the axial leads of all the launching holes 3 and the perforating bullets 4 are distributed on a vertical surface in parallel. The distance between the axes of the upper and lower adjacent transmitting holes 3 is controlled within the range of 0.4-0.6 m, preferably 0.5 m.
The method for reducing the mine earthquake grade by hydraulic fracturing comprises the following steps:
determining the positions of each key layer 5: the positions of a key layer 5 and an isolation layer 6 with frequent mineral shock occurrence in the stratum are determined according to the measurement data of the mineral layer and geological drilling information, and the key layer 5 is a large-section sandstone layer on the upper part of an optimal goaf 7.
Planning the position of the vertical drilling hole 8: the vertical drill holes 8 are arranged on the ground vertically and horizontally, wherein the distance between the vertical drill holes 8 adjacent in the horizontal direction is controlled within the range of 100-120 m, the distance between the vertical drill holes 8 adjacent in the vertical direction is controlled within the range of 120-150 m,
drilling, casing 9 setting and cement slurry injection: drilling according to the vertical drilling position obtained in the second step, wherein each drilling hole is internally provided with a sleeve 9, and then, injecting slurry between each sleeve and the wall of the drilling hole where the sleeve is located until all the vertical drilling holes 8, the lower sleeve 9 and the slurry injection work are completed;
and fourthly, sequentially carrying out perforation and hydraulic fracturing on each key layer 5 from bottom to top, wherein the method comprises the following steps: after the cement paste is solidified, dividing each casing 9 into a plurality of horizontal rows,
selecting two or more transversely adjacent casings as synchronous perforation and fracturing groups from one end of each row of casings 9, sequentially and respectively installing a lower sealer 10 and the perforating gun for reducing the mineral shock level into each casing 9 of the same synchronous perforation and fracturing group, enabling the perforating gun for reducing the mineral shock level to be just positioned in the key layer 5 of the lowest layer, enabling the axial line of each emission hole 3 on at least one side of the perforating gun for reducing the mineral shock level and the axial line of the transversely adjacent casing 9 to be on the same vertical plane, simultaneously triggering each perforating gun for reducing the mineral shock level to carry out perforation, then installing a sealer 11 into the corresponding casing 9, and then connecting each casing 9 of the synchronous perforation and fracturing group with a hydraulic fracturing device (not shown) to carry out hydraulic fracturing, as shown in figure 2.
Then, according to the method, the key layer 5 of the upper layer where the synchronous perforation fracturing group is located is subjected to perforating by installing the sealer 10 and the perforating gun for reducing the mineral earthquake level, perforating and installing the sealer 11, and then the hydraulic fracturing operation is carried out until the perforating and hydraulic fracturing operation of each sleeve 9 of the same synchronous perforation fracturing group in each key layer 5 is completed.
And then selecting two or more transversely adjacent casings 9 in the same row of casings 9 as the next synchronous perforation fracturing group, and repeating the method until the perforation and hydraulic fracturing operations of all the casings 9 in the same row are completed, as shown in fig. 3.
Fifthly, selecting the next row of sleeves 9, repeating the step IV, and performing perforation and hydraulic fracturing operation until all the sleeves 9 are perforated and subjected to hydraulic fracturing operation.
Secondly, the transverse direction of the vertical bore 8 is preferably parallel to the direction of the downhole working surface 12, as shown in fig. 4.
The second embodiment: and in the first step, measuring the stress of the rocks of each key layer 5 in the horizontal direction, and selecting the direction with large stress as the transverse direction in the second step.
The method for reducing the mine earthquake grade by hydraulic fracturing further comprises the following steps: during the advancing process of the working face 12, the mine earthquake is monitored in real time, if a high-grade mine earthquake event occurs, the number and the density of vertical drilling holes need to be supplemented and encrypted, then perforation and hydraulic fracturing operations are carried out, and the rest steps are omitted as described in the first embodiment.
Claims (6)
1. The utility model provides a reduce ore deposit and shake perforating gun for grade, includes barrel and perforating bullet fixing base, be equipped with a plurality of firing holes on the barrel, the perforating bullet fixing base sets up in the barrel, is equipped with a perforating bullet on every firing hole just right perforating bullet fixing base, and this perforating bullet axial lead coincides its characterized in that with the axial lead of the firing hole that corresponds: the launching holes and the corresponding perforating bullets are back to each other, the axial lines of the back perforating bullets are overlapped and vertically intersected with the axial line of the gun barrel, and the axial lines of all the launching holes and the perforating bullets are distributed on a vertical surface in parallel.
2. The perforating gun for reducing the mineral shock rating of claim 1 wherein: the distance between the axial leads of the upper and lower adjacent emission holes is controlled within the range of 0.4-0.6 m, and 0.5 m is preferred.
3. A method for reducing mine earthquake grade by hydraulic fracturing comprises the following steps:
determining the positions of each key layer: determining the positions of the key layers and the isolation layers with frequent occurrence of the mineral earthquake in the stratum through the measurement data of the mineral layers and the geological drilling information,
planning the vertical drilling position: the vertical drilling holes are arranged on the ground vertically and horizontally, wherein the distance between the vertical drilling holes which are adjacent horizontally is controlled within the range of 100-120 m, the distance between the vertical drilling holes which are adjacent vertically is controlled within the range of 120-150 m,
drilling, casing running and cement slurry injection: drilling according to the vertical drilling position obtained in the second step, wherein each drilling hole is internally provided with a sleeve, and then, injecting slurry between each sleeve and the wall of the drilling hole where the sleeve is located until all the vertical drilling, casing running and slurry injection work are completed;
sequentially carrying out perforation and hydraulic fracturing on each key layer from bottom to top, wherein the method comprises the following steps: after the cement paste is solidified, dividing each casing into a plurality of transverse rows,
selecting two or more transversely adjacent casings as synchronous perforation fracturing groups from one end of each row of casings, sequentially and respectively installing a lower sealer and the perforating gun for reducing the mineral shock grade as claimed in claim 1 into each casing of the same synchronous perforation fracturing group, enabling the perforating gun for reducing the mineral shock grade to be just positioned in the key layer of the lowest layer, enabling the axial lead of each emission hole on at least one side of the perforating gun for reducing the mineral shock grade and the axial lead of the transversely adjacent casing to be on the same vertical surface, simultaneously triggering each perforating gun for reducing the mineral shock grade to carry out perforation, then installing a sealer into the corresponding casing, then connecting each casing of the synchronous perforation fracturing groups with a hydraulic fracturing device to carry out hydraulic fracturing,
then, according to the method, the key layer of the upper layer where the synchronous perforation fracturing group is located is subjected to perforating gun for lowering the mine earthquake level as claimed in claim 1, a sealer is installed, perforating is carried out, the sealer is installed, then the hydraulic fracturing operation is carried out until the perforating and hydraulic fracturing operation of each sleeve of the same synchronous perforation fracturing group in each key layer is completed,
then selecting two or more transversely adjacent casings as the next synchronous perforation and fracturing group in the same row of casings, repeating the method until the perforation and hydraulic fracturing operations of all the casings in the same row are completed,
fifthly, selecting the next row of casings, repeating the step IV, and performing perforation and hydraulic fracturing operation until the perforation and hydraulic fracturing operation of all the casings is completed.
4. The hydraulic fracturing method of claim 3, wherein the hydraulic fracturing is carried out in the presence of a hydraulic fluid, wherein the hydraulic fracturing method comprises the steps of: and in the first step, measuring the stress of the rocks of each key layer in the horizontal direction, and selecting the direction with high stress as the transverse direction in the second step.
5. The hydraulic fracturing method of claim 3, wherein the hydraulic fracturing is carried out in the presence of a hydraulic fluid, wherein the hydraulic fracturing method comprises the steps of: and secondly, the transverse direction of the vertical drilling hole is preferably parallel to the direction of a working face in the underground.
6. The method for reducing the mine earthquake rating of hydraulic fracturing according to any one of claims 3 to 5, wherein: it also comprises the following steps: and in the working face advancing process, the mine earthquake is monitored in real time, and if a high-grade mine earthquake event occurs, the number and the density of vertical drilling holes need to be supplemented and encrypted, and then the operations of perforating and hydraulic fracturing are carried out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110309742.2A CN113216912A (en) | 2021-03-23 | 2021-03-23 | Perforating gun for reducing mine earthquake grade and method for reducing mine earthquake grade through hydraulic fracturing |
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| CN202110309742.2A CN113216912A (en) | 2021-03-23 | 2021-03-23 | Perforating gun for reducing mine earthquake grade and method for reducing mine earthquake grade through hydraulic fracturing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982680A (en) * | 2021-10-11 | 2022-01-28 | 北京科技大学 | Coal mine multilayer key layer fracture type mine earthquake energy calculation and maximum mine earthquake prediction method |
| CN114370251A (en) * | 2022-01-14 | 2022-04-19 | 安徽理工大学 | Directional grading and zoning grouting method for overburden bed separation during downward mining of coal seam group |
-
2021
- 2021-03-23 CN CN202110309742.2A patent/CN113216912A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982680A (en) * | 2021-10-11 | 2022-01-28 | 北京科技大学 | Coal mine multilayer key layer fracture type mine earthquake energy calculation and maximum mine earthquake prediction method |
| CN114370251A (en) * | 2022-01-14 | 2022-04-19 | 安徽理工大学 | Directional grading and zoning grouting method for overburden bed separation during downward mining of coal seam group |
| CN114370251B (en) * | 2022-01-14 | 2023-08-18 | 安徽理工大学 | Coal seam group downstream mining overlying strata separation layer directional grading zonal grouting method |
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