CN115949451A - Coal face triangular area multi-disaster cooperative management method based on directional drilling - Google Patents
Coal face triangular area multi-disaster cooperative management method based on directional drilling Download PDFInfo
- Publication number
- CN115949451A CN115949451A CN202310033149.9A CN202310033149A CN115949451A CN 115949451 A CN115949451 A CN 115949451A CN 202310033149 A CN202310033149 A CN 202310033149A CN 115949451 A CN115949451 A CN 115949451A
- Authority
- CN
- China
- Prior art keywords
- directional drilling
- comb
- hole
- drilling
- fracturing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 201
- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000007726 management method Methods 0.000 title claims description 5
- 239000011435 rock Substances 0.000 claims abstract description 86
- 238000000605 extraction Methods 0.000 claims abstract description 84
- 238000000034 method Methods 0.000 claims abstract description 51
- 238000009826 distribution Methods 0.000 claims abstract description 30
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 230000004048 modification Effects 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 21
- 238000003062 neural network model Methods 0.000 claims description 3
- 206010017076 Fracture Diseases 0.000 description 35
- 208000010392 Bone Fractures Diseases 0.000 description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 238000005065 mining Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 239000012530 fluid Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000009466 transformation Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 206010010214 Compression fracture Diseases 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 208000008918 voyeurism Diseases 0.000 description 2
- IYLGZMTXKJYONK-ACLXAEORSA-N (12s,15r)-15-hydroxy-11,16-dioxo-15,20-dihydrosenecionan-12-yl acetate Chemical compound O1C(=O)[C@](CC)(O)C[C@@H](C)[C@](C)(OC(C)=O)C(=O)OCC2=CCN3[C@H]2[C@H]1CC3 IYLGZMTXKJYONK-ACLXAEORSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- -1 drilling sleeve Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- IYLGZMTXKJYONK-UHFFFAOYSA-N ruwenine Natural products O1C(=O)C(CC)(O)CC(C)C(C)(OC(C)=O)C(=O)OCC2=CCN3C2C1CC3 IYLGZMTXKJYONK-UHFFFAOYSA-N 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a directional drilling based multi-disaster cooperative treatment method for a coal face triangular area, which comprises the following steps of: s1, determining a stress concentration zone of a triangular area of a coal face; s2, designing the distribution control layer positions of the main holes and the branch holes of the comb-shaped directional drilling and the distribution control interval of the comb-shaped directional drilling according to the step S1; s3, dynamically analyzing geological conditions, and continuously correcting the exploration of the branch holes; s4, designing the number and the length of branch holes of the comb-shaped directional drilling staged fracturing, drilling the main hole of the comb-shaped directional drilling of the top plate, and performing fracturing modification on the branch holes; s5, determining hole sealing extraction and gas extraction parameters after the comb-shaped directional drilling and fracturing; and S6, dynamically controlling gas extraction and monitoring ore pressure in real time. The cooperative management of the rock burst disaster in the working face end triangular area and the gas extraction in the goaf is realized, and the problems of small control area, high cost and the like of rock burst drilling and gas extraction drilling in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of coal mine disaster treatment, in particular to a multi-disaster cooperative treatment method for a coal face goaf, corner gas and an end triangular area based on directional drilling.
Background
Coal bed geological conditions in China are complex, most of mine gas disasters are serious, coal and gas outburst risks are increased day by day along with year extension of mining depth, rock burst accidents are caused frequently, and the coal mine gas outburst disasters cause great threats to coal mine safety production.
Aiming at the problems of increased risk of composite dynamic disasters, increased difficulty in prevention and treatment technology and high treatment cost under the coupling action of rock burst and coal and gas outburst. The rock burst can not only cause local roof fall, but also can induce abnormal gas emission in the goaf, even cause coal and gas outburst, and the coupling disaster phenomenon appears in partial mining areas in China.
The coal body and the top plate at the end triangular area at the connection part of the return airway and the working face undercut are always in an elastic-plastic deformation state, and when the lithology of the top plate is hard, the overhang area of the top plate of the goaf at one side of the return airway is difficult to effectively control along with the propulsion of the working face. Particularly, in a mine with a rock burst tendency, a return corner top plate is easy to form a cantilever beam structure, an end suspended roof is difficult to orderly collapse, a triangular area top beam deforms, breaks and bursts in the process of recovery, and the risk of local roof collapse is higher. Meanwhile, the upper corner of the return airway is also an area where gas on the working face is easy to accumulate and the concentration is easy to exceed the limit, and the gas in the goaf is frequently dissipated out of the working face along with the rock burst, so that the mine production is influenced.
A great deal of research is carried out on rock burst control and gas disaster control at home and abroad, but a comprehensive control method aiming at abnormal burst and accumulation of rock burst and gas in a working face end triangular area is less, the existing measure for simultaneously controlling the rock burst and the gas disaster of a coal bed is a method of determining the distance between drill holes, releasing the pressure, arranging a great number of short drill holes, respectively carrying out water injection and plasticizing the coal bed for many times and carrying out water injection and gas extraction alternation, but the method has the defects of complex working procedures, dense drill holes, inconvenient construction, inapplicability to the end triangular area and incapability of controlling upper corner gas and mined-out area gas on the basis of air return corner top plate control.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a directional drilling-based coal face triangular area multi-disaster cooperative treatment method, comb-shaped directional long drill holes are designed and arranged in a working face end triangular area, so that a main hole and a branch hole are respectively positioned at a specific layer, a high-power fracturing pump unit is used for fracturing the whole section of the branch hole, the pressure relief of a hard roof covering a return air corner is realized, the crack development of a gas enrichment area is expanded, the gas extraction effect is enhanced, the problems of high rock burst disaster of the roof covering the end triangular area, high upper corner and goaf gas cooperative treatment cost and limited influence range of conventional extraction or pressure relief drill holes are solved, the mine pressure and gas source treatment is realized, the cost is reduced, the effect is increased, and the safe production of a coal mine is ensured.
A coal face triangular area multi-disaster cooperative management method based on directional drilling comprises the following steps:
s1, determining a stress concentration zone of a coal face triangular area;
and analyzing the lithologic character of the overlying strata at the end of the working face, acquiring the stress data and the gas emission data of the surrounding rocks of the working face in the stoping process, evaluating the disaster degree of the gas and rock burst in the triangular area, and determining the stress concentrated zone.
Specifically, S11, geological data, mine pressure monitoring data and gas data are correspondingly acquired through a drilling column, a mine pressure stress monitoring system and a roadway gas monitoring system respectively.
The mine pressure stress monitoring system comprises a stress detector, a gas detector and a signal acquisition station; stress detector, gas detector respectively with the signal acquisition station is connected, stress detector is used for detecting overlying strata stress change, gas detector is used for surveying the gas concentration change, the signal acquisition station is used for gathering information and gas concentration real-time supervision when stress detector senses stress change signal.
And S12, inputting the data in the S11 into a pre-trained mine pressure disaster and gas emission early warning neural network model to obtain the disaster degree characteristics of the gas and rock burst in the triangular area, and determining a stress concentrated zone so as to provide a basis for distribution and control of main holes and branch holes of comb-shaped directional drilling.
S2, designing the distribution control layer positions of the main holes and the branch holes of the comb-shaped directional drilling and the distribution control interval of the comb-shaped directional drilling according to the step S1;
specifically, S21, according to a drilling actual measurement method, the positions of the three zones of the overlying strata are observed through a geological drilling and drilling peeping instrument, or the height horizons of the caving zone and the fractured zone are calculated through mining the height empirical formula or numerical simulation of the three zones of the overlying strata. The height horizon is a range, and the height range of the falling zone is defined as h 1-h 2, and the height range of the fractured zone is defined as h 3-h 4.
S22, designing the distribution control layer position of the main hole and the branch hole of the comb-shaped directional drilling according to the step S21; and determining the distribution control interval of the branch holes.
After the coal seam is recovered, the overlying rock stratum in the goaf is gradually crushed, transported and settled to form a caving zone, a fissure zone and a bending subsidence zone. The caving zone is affected by mining, the fracture fully develops, and the gas in the zone is locally enriched and is a core zone for extraction and treatment. The overlying strata in the fractured zone are generally hard in texture, large in thickness and not easy to collapse, and are target layers for treating rock burst and solving disasters such as end suspended roofs.
The main hole position of the comb-shaped directional drilling is designed in the fracture zone, and the distribution control position height is
The level of the comb-shaped directional drilling branch hole is designed between the caving zone and the level of the main hole, and the level height range of the branch hole is
Designing a distribution control interval L1 of the comb-shaped directional drilling branch hole: determining the distribution control interval L1 of the branch holes to be 2 times of the smaller value of the R1 and the R2 according to the calculated values of the effective radius R1 of gas extraction and the effective influence radius R2 of hydraulic fracturing after the drill fracturing, and avoiding the influence on the blank area;
wherein, the effective radius R1 of gas extraction after drilling and fracturing is as follows:
in the formula, fr is the friction factor of the rock body;
internal angle of friction, (°) of coal; sigma 0 Is the stress of rock mass, MPa, sigma c The uniaxial compressive strength of the rock mass is MPa, and r0 is the radius of a drilled hole, m.
The effective influence radius R2 of the hydraulic fracturing is obtained by comparing and referring empirical values of the influence radius under the same pump injection pressure and the fracturing water injection time under the large-scale practice of the hydraulic fracturing by a testing method of a stress reduction method or an electromagnetic radiation method.
S23, drilling construction: and constructing the comb-shaped directional drilling holes on one side of the working face air return roadway at the construction site in the direction perpendicular to the roadway according to the distribution and control distance L1, wherein the total length of the comb-shaped directional drilling holes is determined according to the trend length of the working face.
S3, dynamically analyzing geological conditions, and continuously correcting exploration of the branch holes;
and comprehensively analyzing and predicting the data according to the characteristics of three-dimensional earthquakes, drilling columnar shapes and geological structures revealed by existing roadways. Firstly, obtaining geological structure characteristics of a fractured region according to a mining plane graph and geological profile prediction graph data drawn by geological exploration drilling; secondly, collecting a rock stratum boundary contour map and a seismic time section map of the three-dimensional seismic interpretation of the area, and correcting the rock stratum structural form; and finally, collecting underground measurement data, superposing the underground measurement data with a three-dimensional seismic interpretation result, ensuring the accuracy of the layer position form of the target rock stratum, adjusting the angle of a drilling machine according to the result of 'constantly correcting by probing the branch hole' in the drilling construction process, controlling the accuracy of a drilling track, and ensuring that the construction accuracy can be controlled to be about 5m away from a fracturing target position.
S4, designing the number and the length of branch holes of the comb-shaped directional drilling staged fracturing, carrying out drilling construction on a main hole of the comb-shaped directional drilling of the top plate, and carrying out fracturing modification on the branch holes.
Specifically, S41, according to the lithology and the thickness of a fractured target rock stratum, the length of branch holes of comb-shaped directional drilling branch holes extending downwards from a main hole of the comb-shaped directional drilling hole is designed, according to the effective influence radius R2 of hydraulic fracturing, the distance between the branch points is determined to be 2R2, and according to the length P of the main hole of the comb-shaped directional drilling hole of the fractured section, the number of the branch holes is determined to be P/2R2.
S42, according to the step S3, drilling of the main hole and the branch hole of the comb-shaped directional drilling is completed through a directional drilling construction equipment measurement while drilling and a hole bottom motor drilling construction parameter adjusting system; the side-drilling branch method is adopted in the construction drilling method of the drilling tail end branch hole 28, and the construction precision of the branch hole is strictly controlled through measurement while drilling and a hole bottom motor adjusting system according to branch design parameters.
Finally, the vertical error of the main hole of the comb-shaped directional drilling is controlled to be +/-0.5 m, the horizontal error of the main hole of the comb-shaped directional drilling is controlled to be +/-2 m, and the vertical error of the branch hole of the comb-shaped directional drilling is controlled to be +/-5 m.
And (3) finishing the construction of the branch hole at the tail end of the hole, adopting a 'retreating type' process, and reserving the branch point at a design point by adjusting the facing angle of the hole bottom motor.
And S42, repeating the step until the branch hole at the head end of the construction drilling hole is drilled, and completing the drilling process of the main hole and the branch hole of the comb-shaped directional drilling hole.
S43, performing fracturing transformation on the branch section, and conveying a fracturing tool string to a position between a junction of a branch hole at the tail end of a main hole of the comb-shaped directional drilling hole and the main hole through a directional drilling machine to serve as a design position of the first section of fracturing.
As shown in fig. 5, the fracturing tool string comprises a release, a packer 1, a flow restrictor, a packer 2 and a guide shoe. And (3) adopting a double-sealing single-clamping process of setting two packers, carrying out setting on the front side and the rear side of the intersection point of the main hole and the branch hole of the comb-shaped directional drilling, and after fracturing construction is finished, releasing pressure and draining water to finish fracturing transformation of the branch hole.
Preferably, the fracturing fluid for staged fracturing in S4 is clear water, and the pumping pressure is maintained at 13MPa to 25MPa.
S44, adopting a retreating type dragging fracturing tool string, continuously repeating the process of S43, completing fracturing of all the branch holes, further forming a plurality of fracturing sections, and when the high-pressure fracturing fluid reaches 3MPa, completely setting the packer, and when the continuous pressurizing pressure reaches 5MPa, opening the flow restrictor to realize fracturing construction of the fracturing sections; in the fracturing construction process, high-pressure fracturing fluid is continuously injected into a roof rock stratum to promote the water pressure acting on the rock stratum to be gradually increased, and when the pressure is greater than the rock stratum fracture pressure, the elastic residual energy of the rock stratum is released in a kinetic energy mode and is expressed as dynamic phenomena such as rock mass compression fracture, vibration and the like, so that a new fracture system is generated in the rock stratum, the integral integrity of the rock stratum is damaged, and the strength of the rock stratum is reduced; and a three-dimensional fracture network is generated in a hard rock stratum, the treatment and optimization of the rock covering of the rock burst roof are realized, and a gas migration channel is added in a mining fracture zone for reconstruction.
And S5, hole sealing extraction and gas extraction parameter determination after comb-shaped directional drilling and fracturing.
S51, determining the hole diameter of the drilled hole according to the drilling capacity of the drilling machine and the diameter of the fracturing tool string and determining the parameters of comb-shaped directional drilling gas extraction negative pressure and hole sealing modeAnd (4) determining. The concentration and the pressure of gas to be extracted in the comb-shaped directional drilling fractured zone of the top plate are relatively small, and after the extraction negative pressure of the directional long drill hole at the top overcomes the friction resistance and the local resistance of the drill hole, the residual negative pressure needs to be far lower than the negative pressure of a stope, so that the target of large-flow extraction can be realized; according to the design of the single-hole extraction gas mixing amount, the diameter of a drill hole, the length of the drill hole and the deformation condition of the drill hole, the extraction negative pressure required by gas extraction in the directional long drill hole fractured zone can be estimated, the initial section of the drill hole is regarded as a circle, and the resistance value to be overcome by gas extraction can be corrected by referring to a calculation formula of the resistance of a drainage pipeline, so that part of parameters are corrected; the local resistance was estimated from 15% of the straight tube resistance loss. The calculation formula of the resistance of the drainage pipeline is as follows: hm =9.81gQ 2 gγgL/(KgD 5 )
In the formula: hm is pipeline friction resistance, pa;
l is the length of the pipeline of the negative pressure section, m;
q is the flow of the mixed gas in the drainage pipe, and the flow is m3/h;
gamma-density ratio of mixed gas to air;
k-coefficient related to pipe diameter;
d, drawing and discharging the inner diameter of the pipe, namely cm;
the negative pressure of extraction of the normal coal seam penetrating coal seam extraction borehole is 13kPa, and gas extraction of a goaf belongs to open extraction according to the empirical value of field practice.
Preferably, the extraction underpressure is generally less than 13kPa.
S52, top plate comb-shaped directional drilling: placing a seamed steel pipe with the total length not less than 30m at the position of the opening of the drilled hole as a hole sealing pipe, wherein the length of the hole sealing section is slightly less than the total length of the hole sealing pipe; the hole sealing length required according to field experience is 15m to 30m; preferably, the sealant is polyurethane or Marilyn, and the sealant is cement mortar or yellow mud.
S53, connecting the comb-shaped directional drilling hole of the top plate with an extraction pipeline system, installing a gas pressure gauge and an electronic flow monitor on an orifice pipeline, adjusting the negative pressure of the extraction system, observing the indication number of the pressure gauge, and when the indication number of the pressure gauge and the negative pressure adjusted by the extraction system tend to be stable and consistent, proving that hole sealing is good, otherwise, returning to repeat S52, and increasing the hole sealing depth and quality until the hole sealing result is good.
S6, dynamically controlling gas extraction and monitoring ore pressure in real time;
and continuously exploring the hydraulic fracturing influence range of the comb-shaped directional drilling hole of the top plate by an in-hole transient electromagnetic method after fracturing to determine the fracturing effect. In the working face stoping process, the comb-shaped directional drilling holes gradually penetrate into the goaf, the drilling holes in the rock stratum section at the tail end deform and collapse, the effective extraction length of the drilling holes is reduced, then the extraction system is adjusted, the negative pressure is dynamically changed, and the extraction energy loss is reduced.
And in the process of stoping, monitoring mine pressure monitoring data such as roadway roof displacement, roof stress gauges and the like in real time, and the gas concentration of an extraction pipeline and a working face, and recording and comparing rock burst and gas extraction treatment effects before and after fracturing treatment.
Preferably, the length range of the main hole of the comb-shaped directional drilling is 200m to 2000m, the length range of the branch hole of the comb-shaped directional drilling is 40m to 150m, and the number of the branch holes of the comb-shaped directional drilling is 3 to 10.
Preferably, the comb-shaped directional drilling and staged hydraulic fracturing technology in S4 is used for guiding by directional drilling of branch holes and sealing of two packers, directional control of the extension direction of a fracture is realized by a naked eye integral setting and step-by-step deblocking staged fracturing technology, sufficient pressure relief is performed on a target rock stratum, a three-dimensional fracture network is formed, and roof collapse is effectively controlled.
Preferably, the fracturing fluid for staged hydraulic fracturing in S4 is clear water, and the pumping pressure is maintained at 13MPa to 25MPa.
Preferably, the gas extraction parameters of the comb-shaped directional drilling hole in the step S5 comprise drilling hole length, drilling hole diameter, extraction negative pressure, extraction time, extraction flow and extraction concentration. The hole sealing material and parameters comprise hole sealing agent, drilling sleeve, hole sealing length and hole sealing strength.
Preferably, the hydraulic fracturing influence range is explored and determined by measuring the change of the total moisture of the coal bed through sampling, but the conventional sampling workload is large, and the sampling of the broken and soft coal bed is difficult and frequent, on the basis, the change condition of the water content in the radial range of the drill hole before and after the fracturing of the drill hole is explored and explored through the transient electromagnetic profile, the water-rich property is uniform, and the resistivity isoline is in a layer shape; the resistivity value of the water-rich area is reduced, the contour line is distorted, deformed and the like, and the influence radius of the hydraulic fracturing is determined according to the change of the water content in a certain radial range continuously detected along the axial direction of the drill hole.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the working face triangular region multi-disaster cooperative treatment method based on the orientation Kong Yikong multi-purpose realizes cooperative treatment of rock burst disasters and goaf gas extraction in the working face end triangular region, and solves the problems of small treatment area, large engineering quantity, high cost, mutual interference and the like of rock burst prevention drilling and gas extraction drilling in the prior art.
(1) The fracture channel between the caving zone and the fracture zone develops and gas is enriched, but the upper fracture of the caving zone mainly develops the separation fracture, the middle-lower fractures are mostly broken fractures, the caving zone is more easily compacted by the top fracture zone, a drill hole is not easy to maintain, the gas extraction period is short, and the gas extraction efficiency is low. Therefore, gas extraction is carried out through the comb-shaped branch holes of the directional holes.
(2) The overburden rock of the fractured zone is hard, thick, few in primary fractures and difficult to collapse, an end is prone to be suspended, an extraction drill hole is arranged at the position, although the gas extraction effect is limited, the hole forming quality is high, the stability of the drill hole is high, the position is also the best control area of the pressure relief drill hole, pressure relief of a hard top plate is weakened through the comb-shaped main hole of the directional hole, and gas extraction is conducted through the branch hole.
(3) According to the top plate comb-shaped directional drilling hole based on directional drilling, a main hole and branch holes respectively play different roles at a specific layer, the gas extraction effect of a drilling body formed by the branch holes and the main hole is better, and after stoping is finished, the branch holes deep into a goaf lose effectiveness due to top plate migration collapse holes, and the main hole and the rest comb-shaped branch holes can be reserved for a longer time for effective extraction.
(4) The high-power fracturing pump unit is used for staged hydraulic fracturing of the comb-shaped directional drilling hole of the top plate, multi-effect coupling of drilling pressure relief and fracturing pressure relief of a three-dimensional fracture can be achieved under the guidance of the branch hole, the fracture of a target rock body is effectively increased, overlying strata accumulation pressure is released, and the impact tendency is weakened.
(5) Meanwhile, hydraulic fracturing of the comb-shaped directional drilling hole on the top plate is realized by injecting clear water for pressure relief, is green and environment-friendly, is convenient and quick for management and maintenance of the drilling hole during extraction, and can realize regional management according to the length of the drilling hole.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a flow chart of the operational steps of the present invention;
FIG. 2 is a longitudinal perspective view of a single top plate comb-shaped directional drilling staged hydraulic fracturing cloth hole before recovery in the invention;
FIG. 3 is a longitudinal perspective view of staged hydraulic fracturing cloth holes of a single top plate comb-like directional drilling during the recovery process of the present invention;
FIG. 4 is a top view of the multi-top plate comb-shaped directional drilling staged fracturing hole distribution.
Fig. 5 is a schematic diagram of the first branch section fracturing of a single roof comb-shaped directional drilling in the present invention.
Reference numerals:
1-sealing a hole pipe; 2-directional drilling a main hole in a comb shape; 3-comb-shaped directional drilling branch holes; 4-branch hole fracturing setting position; 5-a target rock formation; 6-old top; 7-immediate ejection; 8-coal bed; 9-fissure zone; 10-crack; 11-falling band; 12-haulage lane; 13-a corner; 14-a goaf; 15-top plate comb-shaped directional drilling 1; 16-top plate comb-like directional drilling 2; 17-drill site 1; 18-drill site 2; 19-return airway; 20, drilling holes left after the directional drilling machine drills; 21-pushing an oil pipe; 22-drilling a head end branch hole; 23-releasing; 24-a packer 1; 25-a current limiter; 26-a packer 2; 27-a guide shoe; 28-drilling a tail branch hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, a directional drilling based coal face triangular area multi-disaster cooperative treatment method includes the following steps:
s1, determining a stress concentration zone of a triangular area of a coal face;
and analyzing the lithologic character of the overlying strata at the end of the working face, acquiring the stress data and the gas emission data of the surrounding rocks of the working face in the stoping process, evaluating the disaster degree of the gas and rock burst in the triangular area, and determining the stress concentrated zone.
Specifically, S11, geological data, mine pressure monitoring data and gas data are correspondingly acquired through a drilling column, a mine pressure stress monitoring system and a roadway gas monitoring system respectively.
The mine pressure stress monitoring system comprises a stress detector, a gas detector and a signal acquisition station; stress detector, gas detector respectively with the signal acquisition station is connected, stress detector is used for detecting overlying strata stress change, gas detector is used for surveying the gas concentration change, the signal acquisition station is used for gathering information and gas concentration real-time supervision when stress detector senses stress change signal.
And S12, inputting the data in the S11 into a pre-trained mine pressure disaster and gas emission early warning neural network model to obtain the disaster degree characteristics of the gas and rock burst in the triangular area, and determining a stress concentrated zone so as to provide a basis for distribution and control of the main hole 2 and the branch holes of the comb-shaped directional drilling.
S2, designing a distribution control layer position of the comb-shaped directional drilling main hole 2, a branch hole and a distribution control interval of the comb-shaped directional drilling according to the step S1;
specifically, S21, according to a drilling actual measurement method, observing the positions of three zones of the overlying strata through a geological drilling and drilling peeping instrument, or simulating the height levels of the caving zone 11 and the fractured zone 9 through adopting a height empirical formula of the three zones of the overlying strata or a flac3d or UDEC software numerical value, wherein the measured height level is a range, the height range of the caving zone 11 is defined as h 1-h 2, and the height range of the fractured zone 9 is defined as h 3-h 4.
As shown in fig. 2 and 3, according to the formation information and the lithology and thickness of the rock stratum displayed in the drilling histogram, the height of the collapse zone (i.e., the caving zone) and the height of the fracture zone (i.e., the fracture zone) are calculated as shown in table 1 by combining the recommended formula of building, water body, railway and main roadway coal pillar reservation and coal pressing mining guideline with the practical experience.
TABLE 1 empirical formula for calculating height of collapse zone and height of fracture zone
Note: m-mining height, M; n-number of coal layering layers; h a -maximum height of the caving zone, m; h c Maximum height of the fracture zone, m.
S22, designing the distribution control layer position positions of the main hole 2 and the branch holes of the comb-shaped directional drilling according to the step S21; and determining the distribution control interval of the branch holes.
After the coal seam is recovered, the overlying rock stratum of the goaf 14 is gradually crushed, transported and settled to form an caving zone, a fracture zone and a bent sinking zone. The caving zone 11 to the fracture zone 9 are affected by mining, the fracture 10 is fully developed, and gas in the zone is locally enriched and is a core zone for extraction and treatment. The overlying strata of the fractured zone 9 are generally hard in texture, large in thickness and not easy to collapse, and are target layers for treating rock burst and solving disasters such as end overhanging and the like.
Wherein the weak rock stratum refers to mudstone, argillaceous sandstone and the like with the uniaxial compressive strength of 10-20 MPa; the medium hard rock layer refers to sandstone, argillaceous limestone, sandy mudstone, sandy shale, shale and the like with uniaxial compressive strength of 20-40 MPa; the hard rock stratum refers to quartz sandstone, limestone, sandy mudstone, conglomerate and the like with uniaxial compressive strength of 40-80 MPa; thick rock formations refer to rock formations with a thickness of more than 3 m.
The level of the main hole 2 of the comb-shaped directional drilling is designed in the fractured zone 9, and the height of the distribution and control level is
The branch hole level is arranged between the caving zone 11 and the main hole level, and the level height range of the branch hole is->
The level of a main hole 2 of the comb-shaped directional drilling is designed in a fracture zone 9, the level of a branch hole is designed between an caving zone 11 and the level of the main hole, and the level design is further optimized based on the fracturing effect of a high-power fracturing pump set, so that one hole is multipurpose and the multiple disasters are cooperatively treated.
Designing a distribution control interval L1 of the comb-shaped directional drilling branch hole 3: determining the distribution control interval L1 of the branch holes to be 2 times of the smaller value of the R1 and the R2 according to the calculated values of the effective radius R1 of gas extraction and the effective influence radius R2 of hydraulic fracturing after the drilling fracturing, and avoiding the influence on the blank area;
wherein, the effective radius R1 of gas extraction after drilling and fracturing is as follows:
in the formula, fr is the friction factor of the rock body;
internal angle of friction, (°) of coal; sigma 0 Stress of rock mass, MPa, sigma c The uniaxial compressive strength of the rock mass is MPa, and r0 is the radius of a drilled hole, m.
The effective influence radius R2 of the hydraulic fracturing is obtained by comparing and referring empirical values of the influence radius under the same pump injection pressure and the fracturing water injection time under the large-scale practice of the hydraulic fracturing by a testing method of a stress reduction method or an electromagnetic radiation method.
S23, drilling construction: and constructing the comb-shaped directional drilling holes on one side of the return airway 19 of the working face in the direction perpendicular to the airway according to the distribution control interval L1 at the construction site, wherein the total length of the comb-shaped directional drilling holes is determined according to the trend length of the working face.
S3, dynamically analyzing geological conditions, and continuously correcting the branch hole in the process of construction;
and dynamically analyzing geological conditions according to three-dimensional earthquake, drilling columnar and existing roadway disclosure geological structure characteristics. Firstly, obtaining the geological structure characteristics of a fracturing area according to a mining plane graph and geological profile prediction graph data drawn by geological exploration drilling; secondly, collecting a rock stratum boundary contour map and a seismic time section map of the three-dimensional seismic interpretation of the area, and correcting the rock stratum structural form; and finally, collecting underground measurement data, superposing the underground measurement data with a three-dimensional seismic interpretation result, ensuring the accuracy of the layer position form of the target rock stratum, adjusting the angle of a drilling machine according to the result of 'constantly correcting by probing the branch hole' in the drilling construction process, controlling the accuracy of a drilling track, and ensuring that the construction accuracy can be controlled to be about 5m away from a fracturing target position.
S4, designing the number and the length of branch holes of the comb-shaped directional drilling staged fracturing, drilling the main hole 2 of the comb-shaped directional drilling of the top plate, and performing fracturing transformation on the branch holes.
Specifically, S41, according to the lithology and the thickness of a fractured target rock stratum, the length of branch holes extending downwards from a comb-shaped directional drilling main hole 2 of a comb-shaped directional drilling branch hole 3 is designed, according to the effective influence radius R2 of hydraulic fracturing, the distance between branch points is determined to be 2R2, and according to the length P of the comb-shaped directional drilling main hole of a fracturing section, the number of the branch holes is determined to be P/2R2.
As shown in fig. 2 and 3, one side of a target rock stratum 5 is provided with a branch hole fracturing setting position 4, an old top 6, a direct top 7 and a coal seam 8 are sequentially arranged, a comb-shaped directional drilling main hole 2 is designed to be 500m to 600m long, a horizontal section is branched every 60m, and 5 comb-shaped directional drilling branch holes are constructed; the length of the comb-shaped directional drilling branch hole 3 is designed to be 40m to 60m.
S42, according to the step S3, drilling of the main hole 2 and the branch holes of the comb-shaped directional drilling is completed through directional drilling construction equipment measurement while drilling and a hole bottom motor drilling construction parameter adjusting system; the side-drilling branch method is adopted in the construction drilling method of the drilling tail end branch hole 28, and the construction precision of the branch hole is strictly controlled through measurement while drilling and a hole bottom motor adjusting system according to branch design parameters.
Finally, the vertical error of the main hole 2 of the comb-shaped directional drilling is controlled to be +/-0.5 m, the horizontal error of the main hole is controlled to be +/-2 m, and the vertical error of the branch hole 3 of the comb-shaped directional drilling is controlled to be +/-5 m.
And (3) finishing the construction of the branch hole at the tail end of the hole, adopting a 'retreating type' process, and reserving the branch point at a design point by adjusting the facing angle of the hole bottom motor.
And S42, repeating the step until the branch hole 22 at the head end of the construction drilling hole is formed, and completing the drilling process of the comb-shaped directional drilling main hole 2 and the branch hole.
S43, performing fracturing transformation on the branch section, and conveying a fracturing tool string to a position between a junction of the branch hole at the tail end of the main hole 2 of the comb-shaped directional drilling hole and the main hole through a directional drilling machine to serve as a design position of the first section of fracturing.
The distribution holes for the staged fracturing of the plurality of comb-shaped directional drilling holes on the top plate are shown in fig. 4 and comprise a transportation lane 12, a corner 13, a goaf 14, a comb-shaped directional drilling hole on the top plate 15, a comb-shaped directional drilling hole on the top plate 2 16, a drilling site 1 17, a drilling site 2 18 and a return airway 19.
As shown in fig. 5, the directional drilling machine is used for drilling a borehole 20, and the fracturing tool string comprises a push tubing 21, a borehole head branch hole 22, a release 23, a packer 124, a flow restrictor 25, a packer 2, a guide shoe 27 and a borehole tail branch hole 28. And (3) adopting a double-sealing single-clamping process of setting two packers to perform setting on the front side and the rear side of the intersection point of the main hole 2 of the comb-shaped directional drilling hole and the branch hole, and after fracturing construction is completed, releasing pressure and draining water to complete fracturing transformation of the branch hole.
Preferably, the fracturing fluid for staged fracturing in S4 is clear water, and the pumping pressure is maintained at 13MPa to 25MPa.
S44, adopting a retreating type dragging fracturing tool string, continuously repeating the process of S43, completing fracturing of all the branch holes, further forming a plurality of fracturing sections, when the high-pressure fracturing fluid reaches 3MPa, completely setting the packer, and when the continuous pressurizing pressure reaches 5MPa, opening the flow restrictor to realize fracturing construction of the fracturing sections; in the fracturing construction process, high-pressure fracturing fluid is continuously injected into a roof rock stratum to promote the water pressure acting on the rock stratum to be gradually increased, and when the pressure is greater than the rock stratum fracture pressure, the elastic residual energy of the rock stratum is released in a kinetic energy mode and is expressed as dynamic phenomena such as rock mass compression fracture, vibration and the like, so that a new fracture system is generated in the rock stratum, the integral integrity of the rock stratum is damaged, and the strength of the rock stratum is reduced; and then generating a three-dimensional fracture 10 network in a hard rock stratum, optimizing the treatment of the impact ground pressure roof overlying strata, and increasing the reconstruction of a gas migration channel in a mining fracture zone 9.
And S5, determining hole sealing extraction and gas extraction parameters after the comb-shaped directional drilling and fracturing.
And S51, determining the hole diameter of the drilled hole according to the drilling capability of the drilling machine and the diameter of the fracturing tool string and determining parameters of comb-shaped directional drilling gas extraction negative pressure and hole sealing mode. The concentration and the pressure of gas to be extracted in the top plate comb-shaped directional drilling fractured zone 9 are relatively low, and after the extraction negative pressure of the top directional long drill hole overcomes the drill hole friction resistance and the local resistance, the residual negative pressure needs to be far lower than the stope negative pressure, so that the target of large-flow extraction can be realized; according to the design of the single-hole extraction gas mixing amount, the diameter of a drill hole, the length of the drill hole and the deformation condition of the drill hole, the extraction negative pressure required by gas extraction of the directional long drill hole fractured zone 9 can be estimated, the initial section of the drill hole is regarded as a circle, and the resistance value to be overcome by gas extraction can be corrected by referring to a calculation formula of the resistance of a drainage pipeline, so that part of parameters are corrected; the local resistance was estimated from 15% of the straight tube resistance loss. The calculation formula of the resistance of the drainage pipeline is as follows: hm＝9.81gQ 2 gγgL/(KgD 5 )
In the formula: hm-pipeline frictional resistance, pa;
l is the length of the pipeline of the negative pressure section, m;
q is the flow of the mixed gas in the drainage pipe, and m3/h;
gamma-density ratio of mixed gas to air;
k-coefficient related to pipe diameter;
d, drawing and discharging the inner diameter of the pipe, namely cm;
the extraction negative pressure of the normal coal seam crossing coal seam extraction borehole is 13kPa, the 14 gas extraction of the goaf belongs to open extraction according to the experience value of field practice, and preferably, the extraction negative pressure is generally less than 13kPa.
S52, the extraction negative pressure of the comb-shaped directional drilling hole of the top plate is high, and higher hole sealing quality is required. Placing a seamed steel pipe with the total length not less than 30m at the position of the opening of the drilled hole as a hole sealing pipe 1, wherein the length of the hole sealing section is slightly less than the total length of the hole sealing pipe 1; the sealing length required according to field experience should be 15m to 30m, and preferably, the sealing agent is polyurethane or Marilyn, and the sealing agent is cement mortar or yellow mud.
S53, connecting the comb-shaped directional drill hole with an extraction pipeline system, installing a gas pressure gauge and an electronic flow monitor on an orifice pipeline, adjusting the negative pressure of the extraction system, observing the indication number of the pressure gauge, and when the indication number of the pressure gauge and the negative pressure adjusted by the extraction system tend to be stable and consistent, proving that hole sealing is good, otherwise, returning to repeat S52, and increasing the hole sealing depth and quality until the hole sealing result is good.
And S6, dynamically controlling gas extraction and monitoring ore pressure in real time.
And continuously exploring the hydraulic fracturing influence range of the comb-shaped directional drilling hole by an in-hole transient electromagnetic method after fracturing to determine the fracturing effect. In the working face stoping process, the comb-shaped directional drilling holes gradually penetrate into the goaf 14, the drilling holes in the rock layer sections at the tail ends deform and collapse, the effective extraction length of the drilling holes is reduced, then an extraction system is adjusted, the negative pressure is dynamically changed, and the extraction energy loss is reduced.
And in the stoping process, monitoring mine pressure monitoring data such as roadway roof displacement, roof stress gauges and the like in real time, and the gas concentration of an extraction pipeline and a working face, and recording and comparing rock burst before and after fracturing treatment and the gas extraction treatment effect.
The principle of the invention is that comb-shaped directional drilling holes are designed and arranged in a triangular area at the end head of a working face, so that a main hole 2 and branch holes of the comb-shaped directional drilling holes are respectively positioned at a specific layer, namely the main hole is arranged in a hard rock stratum of a fracture zone 9, the drilling hole forming quality is ensured, the service life is prolonged, the comb-shaped branch holes extending from the main hole communicate with a gas enrichment area between the fracture zone 9 and an caving zone 11, and the gas extraction range is enhanced; the high-power fracturing pump is utilized to fracture the whole section of the branch hole, the overlying hard rock layer crack 10 and the weak surface are increased by hydraulic fracturing of the comb-shaped directional drilling hole, the cohesive force between rock layers can be reduced by fracturing water injection, a water wedge is formed after high-pressure water, the weak surface of the crack 10 in the rock can be increased, the strength of the fractured rock is remarkably reduced, the top plate of the corner 13 is collapsed in time, and therefore the top plate suspension and collapse area is reduced. When the overlying strata stress transfer and release are realized, the generated fracture 10 channel is fractured, the rock stratum fracture 10 between the main hole and the branch hole is increased, the air permeability of the rock stratum and the gas extraction efficiency of the mining area A are improved, and the risk of the upper corner 13 exceeding the gas limit is reduced. The aims of one hole with multiple purposes, cost reduction and efficiency improvement are fulfilled. The method is simple and easy to operate, can fully utilize various effects of drilling, and avoids the repeatability and the waste of drilling construction in the prior art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A coal face triangular area multi-disaster cooperative management method based on directional drilling comprises the following steps:
s1, determining a stress concentration zone of a coal face triangular area;
s2, designing the distribution control layer positions of the main holes and the branch holes of the comb-shaped directional drilling and the distribution control interval of the comb-shaped directional drilling according to the step S1;
s3, dynamically analyzing geological conditions, and continuously correcting exploration of the branch holes;
s4, designing the number and the length of branch holes of the comb-shaped directional drilling staged fracturing, carrying out drilling construction on a main hole of the comb-shaped directional drilling of the top plate, and carrying out fracturing modification on the branch holes;
s5, hole sealing extraction and gas extraction parameter determination after comb-shaped directional drilling and fracturing;
and S6, dynamically controlling gas extraction and monitoring ore pressure in real time.
2. The directional drilling based coal face triangular area multi-disaster cooperative treatment method according to claim 1, characterized in that: in the step S1, the overburden lithology of the end of the working face is analyzed, surrounding rock stress data and gas emission data of the roadway of the working face in stoping are collected, the disaster degree of the gas and rock burst in the triangular area is evaluated, and a stress zone is determined.
3. The directional drilling based coal face triangular area multi-disaster cooperative treatment method is characterized in that: in the step S1, S11, geological data, mine pressure monitoring data and gas data are correspondingly acquired through a drilling column and a mine pressure stress monitoring system and a roadway gas monitoring system;
and S12, inputting the data in the S11 into a pre-trained mine pressure disaster and gas emission early warning neural network model to obtain the disaster degree characteristics of the gas and rock burst in the triangular area, and determining a stress concentrated zone so as to provide a basis for distribution and control of main holes and branch holes of comb-shaped directional drilling.
4. The directional drilling based coal face triangular area multi-disaster cooperative treatment method according to claim 1, characterized in that: in the step S2, S21, height levels of the caving zone and the fissure zone are measured and calculated; s22, designing the distribution control layer position of the main hole and the branch hole of the comb-shaped directional drilling according to the step S21; and determining the distribution control interval of the branch holes.
5. The directional drilling based coal face triangular area multi-disaster cooperative treatment method is characterized in that: the main hole level of the comb-shaped directional drilling is designed in the fracture zone, and the distribution control level has the height of
The branch hole level is arranged between the landing zone and the main hole level, and the branch hole has a level height range of->
6. The directional drilling based coal face triangular area multi-disaster cooperative treatment method is characterized in that: and determining the distribution control interval L1 of the branch holes according to the calculated values of the effective radius R1 of gas extraction and the effective influence radius R2 of hydraulic fracturing after the drill hole is fractured.
7. The directional drilling based coal face triangular area multi-disaster cooperative treatment method is characterized in that: and (3) after drilling and fracturing, gas extraction effective radius R1:
in the formula, fr is the friction factor of the rock body;
internal angle of friction, (°) of coal; sigma 0 Is the stress of rock mass, MPa, sigma c The uniaxial compressive strength of the rock mass is MPa, and r0 is the radius of a drilled hole, m.
8. The directional drilling based coal face triangular area multi-disaster cooperative treatment method according to claim 7, characterized in that: further comprises the step S23 of drilling construction: and constructing the comb-shaped directional drilling holes on one side of the working face air return roadway at the construction site in the direction perpendicular to the roadway according to the distribution and control distance L1, wherein the total length of the comb-shaped directional drilling holes is determined according to the trend length of the working face.
9. The directional drilling based coal face triangular area multi-disaster cooperative treatment method according to claim 1, characterized in that: and step S3, dynamically analyzing geological conditions according to three-dimensional earthquakes, drilling columnar shapes and the characteristics of geological structures revealed by the existing roadways.
10. The directional drilling based multi-disaster cooperative treatment method for the coal face triangular area is characterized by comprising the following steps of: in the step S4, according to the lithology and the thickness of the fractured target rock stratum, the length of a branch hole of the comb-shaped directional drilling hole extending downwards from the main hole of the comb-shaped directional drilling hole is designed; s42, drilling the main hole and the branch hole of the comb-shaped directional drilling according to the step S3; s43, fracturing and modifying the branch section; and S44, dragging the fracturing tool string in a retreating mode, and continuously repeating the S43 process to complete the fracturing of all the branch holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310033149.9A CN115949451A (en) | 2023-01-10 | 2023-01-10 | Coal face triangular area multi-disaster cooperative management method based on directional drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310033149.9A CN115949451A (en) | 2023-01-10 | 2023-01-10 | Coal face triangular area multi-disaster cooperative management method based on directional drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115949451A true CN115949451A (en) | 2023-04-11 |
Family
ID=87287694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310033149.9A Pending CN115949451A (en) | 2023-01-10 | 2023-01-10 | Coal face triangular area multi-disaster cooperative management method based on directional drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115949451A (en) |
-
2023
- 2023-01-10 CN CN202310033149.9A patent/CN115949451A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110939442B (en) | Method for treating rock burst by pressure relief source in ground fracturing area | |
| Jeffrey et al. | Hydraulic fracturing applied to inducing longwall coal mine goaf falls | |
| CN113464121B (en) | Method for determining gamma geosteering drilling track of azimuth while drilling | |
| Zhang et al. | Prediction of the height of the water-conducting zone above the mined panel in solid backfill mining | |
| Yu et al. | Engineering study on fracturing high-level hard rock strata by ground hydraulic action | |
| CN111691872B (en) | Dynamic and accurate detection method for development range and degree of coal seam overlying strata fracture | |
| CN113404535B (en) | Method for preventing rock burst by hydraulic fracturing of coal mine underground | |
| CN109162731B (en) | Water inrush grouting treatment method for deep mining of iron mine area | |
| CN113622913B (en) | Deformation control method for mining tunnel surrounding rock integrated with underground and up-down tunnel by full-caving method | |
| Huang et al. | Field investigation into directional hydraulic fracturing for hard roof in Tashan Coal Mine | |
| CN112253113A (en) | Method for weakening hard gangue layer by coal mine underground directional long drilling and staged hydraulic fracturing | |
| CN110645039A (en) | Comprehensive control method for rock burst and gas composite disaster of thick and hard roof | |
| CN102852524B (en) | Method for utilizing hydraulic support to improve bauxite recovery rate | |
| CN114991770B (en) | Island working face grouting anti-flushing stoping method based on multistage divergent directional well | |
| Bai et al. | Some aspects of mining under aquifers in China | |
| CN112253114A (en) | Method for weakening hard gangue layer in coal seam by underground coal mine deep hole hydraulic presplitting | |
| Meng et al. | In situ investigation and numerical simulation of the failure depth of an inclined coal seam floor: a case study | |
| CN109611146A (en) | A kind of unrestrained grouting method of absciss layer water | |
| CN115788435A (en) | System and method for preventing rock burst in coal mine from up and down in three-dimensional manner | |
| CN116771348A (en) | Method for reducing dynamic pressure influence of main roadway in last mining and optimizing stoping line coal pillar | |
| Holla et al. | The ground movement, strata fracturing and changes in permeability due to deep longwall mining | |
| Tan et al. | Researches on floor stratum fracturing induced by antiprocedure mining underneath close-distance goaf | |
| Xie et al. | Reasonable stopping method and retracement channel support at fully mechanized top coal caving working face of 15 m extra‐thick coal seam: A case study | |
| CN113323715A (en) | Hard roof strong mine pressure and goaf gas disaster cooperative treatment method | |
| CN116971778A (en) | Method for preventing and controlling hard roof rock burst of coal mine by ground composite fracturing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |