CN109488374A - The comprehensive management of technology of hydrogen sulfide in a kind of coal working face - Google Patents
The comprehensive management of technology of hydrogen sulfide in a kind of coal working face Download PDFInfo
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- CN109488374A CN109488374A CN201811208847.3A CN201811208847A CN109488374A CN 109488374 A CN109488374 A CN 109488374A CN 201811208847 A CN201811208847 A CN 201811208847A CN 109488374 A CN109488374 A CN 109488374A
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- hydrogen sulfide
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- 239000003245 coal Substances 0.000 title claims abstract description 68
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 53
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 238000005553 drilling Methods 0.000 claims abstract description 85
- 238000005520 cutting process Methods 0.000 claims abstract description 43
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000003518 caustics Substances 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims abstract description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 6
- 239000006096 absorbing agent Substances 0.000 claims abstract description 4
- 239000011083 cement mortar Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 16
- 238000005065 mining Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 8
- 230000033228 biological regulation Effects 0.000 claims description 7
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 230000001684 chronic effect Effects 0.000 claims description 3
- 239000002817 coal dust Substances 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000003827 upregulation Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 230000036541 health Effects 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000011953 bioanalysis Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 231100000004 severe toxicity Toxicity 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of comprehensive management of technology of hydrogen sulfide in coal working face, including drilling construction, before coal working face exploitation, concordant of constructing in advance along return airway drilling, using hydraulic jet cutting drilling machine in the drilling internal cutting coal body constructed；Advanced pre- pumping, sealing of hole will be carried out using cement mortar using the drilling after the cutting of hydraulic jet drilling machine, sealed borehole length is not less than 20m, has carried out buck injection twice altogether using the hydrogen sulfide in drainage pump pump drainage coal body, high pressure caustic waterflooding absorption, and buck is the sodium carbonate liquor that mass concentration is 3-5%；And working face spray absorber.The present invention effectively reduces the content of hydrogen sulfide in coal seam, breaches the bottleneck that hydrogen sulfide restricts the safe and efficient production of coal working face, the life security and occupational health of effective guarantee worker.
Description
Technical field
The present invention relates to a kind of comprehensive management of technology of hydrogen sulfide in coal working face, and it is comprehensive to belong to coal working face hydrogen sulfide
Close Treatment process field.
Background technique
Hydrogen sulfide is a kind of gas that is colourless, slightly sweet, having strong rotten-egg odour, and severe toxicity can burn, Air Hydrogen Sulfide
Concentration has explosion danger when being 4.3%~45.5%.Mainly it is to corrode stimulation when Air Hydrogen Sulfide concentration is lower
Main, concentration causes human body go into a coma rapidly or death compared with Gao Shineng.
In the latest 20 years, there is the biggish mine of preservation hydrogen sulfide content in coal seam, gushing out for hydrogen sulfide is raw to safety
Production has constituted a serious threat.It is domestic to its formation mechanism occurrence status since the mine of preservation hydrogen sulfide in coal seam is relatively fewer,
The researchs such as Emission Law, prediction are not yet carried out in a deep going way, are also provided a reference without more successful experience to its administering method.Original Soviet Union
Connection Ma Kai's Prokofiev safety of coal mines research institute starts to the sulphur occurred in some coal mines in the mining area Dun Basi in early 1950s
Change hydrogen to be studied, a set of measure is established in terms of prevention and treatment；The hydrogen sulfide that China started in 1958 to Xinjiang Western Hills coal mine
It is studied and is administered；The hydrogen sulfide of four mine of Hebi mineral bureau was studied and administered in 1966, is all achieved certain
Regulation effect.
Currently, mainly having to the research of hydrogen sulfide Treatment process both at home and abroad: physical method, bioanalysis, chemical method, however for
Hydrogen sulfide Controlling research in mine coal seam is considerably less, mainly by hydrogen sulfide in caustic waterflooding or limewash and coal seam and
The hydrogen sulfide gushed out is arranged by wind, or absorbs hydrogen sulfide in tunnel coal surface sprinkling buck.
Summary of the invention
The present invention coal working face high for underground coal mine hydrogen sulfide content, the present invention are suitable by implementing coal working face
What layer drilling hydraulic slotted liner technique extraction, high pressure caustic waterflooding, working face high-pressure fog absorption and working face were formed after adopting using front
The techniques such as the secondary caustic waterflooding absorption in crack, effectively reduce the preservation amount and outburst amount of coal seam hydrogen sulfide, to guarantee in distinguished and admirable
Concentration of hydrogen sulfide is up to standard.Technical scheme is as follows:
The comprehensive management of technology of hydrogen sulfide in a kind of coal working face, steps are as follows:
(1) drilling construction: before coal working face exploitation, concordant of constructing in advance along return airway drilling is penetrated using waterpower
Stream cutting drilling machine is in the drilling internal cutting coal body constructed.
(2) advanced pre- pumping: sealing of hole will be carried out using cement mortar using the drilling after the cutting of hydraulic jet drilling machine, sealing of hole is long
Degree is not less than 20m；Using the hydrogen sulfide in drainage pump pump drainage coal body, the drilling after cutting increases effectively the emission surface of hydrogen sulfide
Product, improves the sucrose extraction of hydrogen sulfide.
(3) high pressure caustic waterflooding absorbs: after concordant hole pumping and mining concentration of hydrogen sulfide reduces, using low-frequency high-voltage pulse water flooding
It pumps and injects buck into drilling, using high-tension pulse bath to the splitting effect of coal body, improve the crack degree of coal body, increase vulcanization
The contact area of hydrogen and buck neutralizes lye and hydrogen sulfide into coal seam hole, increases the desorption quantity of hydrogen sulfide, as far as possible
More hydrogen sulfide eliminated in coalmass crevasse；With the propulsion of working face extraction, mining induced fissure will form in front of working face, benefit
Preferable situation is developed with the period coalmass crevasse, secondary injection buck absorbent is then carried out, to coal body inside H2S is inhaled
It receives；The buck is the sodium carbonate liquor that mass concentration is 3-5%.
(4) working face spray absorber.When working face extraction, between frame, coal machine cylinder, return, crusher, belt transfer
Arrangement buck is spraying above point and belt, it is ensured that the hydrogen sulfide that coal breakage releases during back production is absorbed.
Further, bore diameter is 110mm in the step (1)；Drilling uses the III mining underground drill rig of A type of SGZ-,
It is equipped with 50 ㎜ drilling rod of Φ and 110 ㎜ diamond compact Noncoring drill bit of Φ drilling.
Further, when cut drilling waterpower using hydraulic jet drill bit in the step (1), pressure pump is used
3ZSB-135/17 high pressure coal seam water injecting pump, rated pressure 30Mpa, pressure duct select diameter 25, pressure-resistant 35MPA's or more
High-pressure rubber pipe；Drilling machine model uses the III mining underground drill rig of A type of SGZ-, and drill pipe diameter selects 75 drilling rods, is equipped with Φ 75mm high pressure
Jet stream rotary-cut drill bit, and Φ 75mm high-pressure jet rotary-cut drill bit is equipped with the small nozzle of high pressure of Φ 1.8mm；Cutting technique is from drilling
In gradually carry out outward, fixed point cutting mode is taken in cutting, forms the disk of 0.2m thickness, and the distance between each disk is 1m,
Stop cutting at the 5m of aperture.Further, the detailed process to drilling waterpower cutting is carried out using hydraulic jet drill bit
It is as follows:
S1. when executing waterpower cutting measures, using into bore cutting mode；Each drilling rod clipping time is 3-5min,
Pressure is not more than 6MPa when preceding 2min is cut, and 3min pressure is adjusted to 10MPa, and pressure after 1min is maintained to increase to 18-
20MPa, when row's coal dust is more smooth, pressure chronic up-regulation to 25-28MPa, when there is plug-hole, pressure should be reduced to
10MPa；
Before increasing pressure to incising coal seam, it should ensure that drilling machine rotates, with a large amount of coal dusts blocking for preventing cutting from generating
It drills and causes to embrace brill.
S2. after a drilling rod is completed in every cutting, answer first regulation relief valve that loine pressure is dropped to 0MPa, and close water inlet pigtail
Ball valve on pipeline, it is ensured that do not have water flow process in pipeline；A drilling rod is removed, after connecting water pigtail, opens ball valve in pipeline
It boosts with regulation relief valve to pipeline, carries out the high-pressure hydraulic cutting operation of second drilling rod.When forbidding to have high pressure water in pipeline
It carries out drilling rod and dismantles operation, boost before forbidding pipeline not connect to pipeline.
S3. every meter of drilling is selected to produce coal control in 200-250kg；After coal output reaches the requirement, next should be carried out
The waterpower of drilling rod is cut.
S4. when each waterpower is cut, when creeping into drilling rod, drilling rod is cleaned one time, to guarantee inside drilling rod without graininess
Coal body.
Further, when in the step (2) using the hydrogen sulfide in drainage pump pump drainage coal body, H2S drainage pump uses
SP200 screw vacuum pump.
Compared with the prior art, the present invention has the following advantages:
Coal working face hydrogen sulfide comprehensive management of technology through the invention effectively reduces the content of hydrogen sulfide in coal seam,
So that the concentration of distinguished and admirable middle hydrogen sulfide gas during working face mining is down to 3-5ppm by 100ppm or more, meets " safety of coal mines
Regulation " 6.6ppm requirement.Implementation of the invention breaches the bottleneck that hydrogen sulfide restricts the safe and efficient production of coal working face,
The life security and occupational health of effective guarantee worker.
Specific embodiment
The invention will now be further described with reference to specific embodiments, the advantages and features of the present invention will be with description and
It is apparent.But examples are merely exemplary, and it is not intended to limit the scope of the present invention in any way.Those skilled in the art answer
It should be appreciated that without departing from the spirit and scope of the invention can details to technical solution of the present invention and form repair
Change or replace, but these modifications and replacement are fallen within the protection scope of the present invention.
The comprehensive management of technology of hydrogen sulfide in a kind of coal working face of embodiment 1
Specific step is as follows:
(1) drilling construction:
It is inclined to construction drill, bore diameter 110mm along coal seam in coal working face crossheading, extraction drilling must cover H2S
Preservation range.Using the III mining underground drill rig of A type of SGZ-, it is equipped with 50 ㎜ drilling rod of Φ and 110 ㎜ diamond compact centreless of Φ bores
Head drilling.
After the completion of drilling construction, cut drilling waterpower using hydraulic jet drill bit.Pressure pump uses 3ZSB-
135/17 high pressure coal seam water injecting pump, rated pressure 30Mpa, pressure duct select diameter 25, the high-pressure glue of pressure-resistant 35MPA or more
Pipe, drilling machine model use the III mining underground drill rig of A type of SGZ-, and drill pipe diameter selects 75 drilling rods, are equipped with the rotation of Φ 75mm high-pressure jet
Drill bit is cut, and Φ 75mm high-pressure jet rotary-cut drill bit is equipped with the small nozzle of high pressure of Φ 1.8mm, water route pressure is adjusted by relief valve
Power.Cutting technique gradually carries out outward in drilling, and fixed point cutting mode is taken in cutting, forms the disk of 0.2m thickness.Each circle
The distance between disk is 1m.Stop cutting at the 5m of aperture.Specific on-link mode (OLM) are as follows: water injecting pump ----relief valve (adjusts pressure
Power) ----sebific duct pipeline extends ----high-pressure spray device that-high pressure water is distinguished ----high pressure sealing drilling rod ---.In specific cutting process
Steps are as follows:
S1. when executing waterpower cutting measures, using into bore cutting mode；Each drilling rod clipping time is 3-5min,
Pressure is not more than 6MPa when preceding 2min is cut, and 3min pressure is adjusted to 10MPa, and pressure after 1min is maintained to increase to 18-
20MPa, when row's coal dust is more smooth, pressure chronic up-regulation to 25-28MPa, when there is plug-hole, pressure should be reduced to
10MPa；
Before increasing pressure to incising coal seam, it should ensure that drilling machine rotates, with a large amount of coal dusts blocking for preventing cutting from generating
It drills and causes to embrace brill.
S2. after a drilling rod is completed in every cutting, answer first regulation relief valve that loine pressure is dropped to 0MPa, and close water inlet pigtail
Ball valve on pipeline, it is ensured that do not have water flow process in pipeline；A drilling rod is removed, after connecting water pigtail, opens ball valve in pipeline
It boosts with regulation relief valve to pipeline, carries out the high-pressure hydraulic cutting operation of second drilling rod.When forbidding to have high pressure water in pipeline
It carries out drilling rod and dismantles operation, boost before forbidding pipeline not connect to pipeline.
S3. every meter of drilling is selected to produce coal control in 200-250kg；After coal output reaches the requirement, next should be carried out
The waterpower of drilling rod is cut.
S4. when each waterpower is cut, when creeping into drilling rod, drilling rod is cleaned one time, to guarantee inside drilling rod without graininess
Coal body.
(2) advanced pre- pumping.Sealing of hole will be carried out using cement mortar using the drilling after the cutting of hydraulic jet drilling machine, sealing of hole is long
Degree is not less than 20m.
H2S drainage pump uses SP200 screw vacuum pump, and discharge outlet sets a water tank in pumping plant, and built-in sodium carbonate liquor is simultaneously fixed
Phase replacement, discharge outlet are inserted into water tank, and the hydrogen sulfide gas of extraction reacts heel row through water tank in distinguished and admirable with sodium carbonate liquor, and
Normally opened purification water curtain is installed in 10 meters of discharge outlet downwind side.
(3) high pressure caustic waterflooding absorbs.After the completion of drilling-draining, high pressure caustic waterflooding is carried out using water injecting pump to the above drilling；
In the injecting process, water injection hole two sides drilling not extraction, by the way of water injection pressure is high after first low；When low pressure water injection, alkali is allowed
Water absorbent slowly infiltrates through cracks in coal seam, takes rapid pressure, when surrounding drilling there are flowing out stopping water filling.With working face
The propulsion of back production will form mining induced fissure in front of working face, then carry out secondary injection buck, to coal body inside H2S is carried out
It reabsorbs；
The buck is the sodium carbonate liquor that mass concentration is 4%；
Water injecting pump: 3ZSB-135/17 high pressure coal seam water injecting pump, normal discharge pressure 30Mpa, operating pressure 8- are used
16Mpa。
(4) spray absorber when working face extraction.When working face extraction, between frame, coal machine cylinder, return, crusher, skin
Arrangement buck is spraying above band transfer point and belt, sprays buck mist by high-pressure spray pump, releases to coal breakage during back production
H2S is absorbed.
Claims (8)
1. the comprehensive management of technology of hydrogen sulfide in a kind of coal working face, which is characterized in that the step of comprehensive management of technology is as follows:
(1) drilling construction: before coal working face exploitation, concordant of constructing in advance along return airway drilling is cut using hydraulic jet
Drilling machine is cut in the drilling internal cutting coal body constructed；
(2) advanced pre- pumping: sealing of hole will be carried out using cement mortar using the drilling after the cutting of hydraulic jet drilling machine, sealed borehole length is not
Less than 20m, the hydrogen sulfide in drainage pump pump drainage coal body is utilized；
(3) high pressure caustic waterflooding absorb: when concordant hole pumping and mining concentration of hydrogen sulfide reduce after, using low-frequency high-voltage pulse water flooding pump to
Buck is injected in drilling；With the propulsion of working face extraction, mining induced fissure will form in front of working face, then carry out secondary injection
Enter buck absorbent, to coal body inside H2S is absorbed；The buck is the sodium carbonate liquor that mass concentration is 3-5%；
(4) working face spray absorber: when working face extraction, between frame, coal machine cylinder, return, crusher, belt transfer point and
Arrangement buck is spraying above belt, it is ensured that the hydrogen sulfide that coal breakage releases during back production is absorbed.
2. comprehensive management of technology according to claim 1, which is characterized in that bore diameter is in the step (1)
110mm。
3. comprehensive management of technology according to claim 1, which is characterized in that drilling uses SGZ-III in the step (1)
A type is mining underground drill rig is equipped with 50 ㎜ drilling rod of Φ and 110 ㎜ diamond compact Noncoring drill bit of Φ drilling.
4. comprehensive management of technology according to claim 1, which is characterized in that bored in the step (1) using hydraulic jet
When head is carried out to drilling waterpower cutting, pressure pump uses 3ZSB-135/17 high pressure coal seam water injecting pump, and rated pressure 30Mpa is high
Pressure pipe road selects diameter 25, the high-pressure rubber pipe of pressure-resistant 35MPA or more.
5. comprehensive management of technology according to claim 1, which is characterized in that bored in the step (1) using hydraulic jet
When head is carried out to drilling waterpower cutting, drilling machine model uses the III mining underground drill rig of A type of SGZ-, and drill pipe diameter selects 75 drilling rods,
It is equipped with Φ 75mm high-pressure jet rotary-cut drill bit, and Φ 75mm high-pressure jet rotary-cut drill bit is equipped with the small nozzle of high pressure of Φ 1.8mm.
6. comprehensive management of technology according to claim 1, which is characterized in that bored in the step (1) using hydraulic jet
When head is carried out to drilling waterpower cutting, cutting technique gradually carries out outward in drilling, and fixed point cutting mode is taken in cutting, is formed
The disk of 0.2m thickness, the distance between each disk are 1m, stop cutting at the 5m of aperture.
7. comprehensive management of technology according to claim 1, which is characterized in that bored in the step (1) using hydraulic jet
Head carry out to drilling waterpower cutting detailed process is as follows:
S1. when executing waterpower cutting measures, using into bore cutting mode；Each drilling rod clipping time is 3-5min, preceding
Pressure is not more than 6MPa when 2min is cut, and 3min pressure is adjusted to 10MPa, and pressure after 1min is maintained to increase to 18-20MPa,
When row's coal dust is more smooth, pressure chronic up-regulation to 25-28MPa, when there is plug-hole, pressure should carry out being reduced to 10MPa；
S2. it after a drilling rod is completed in every cutting, answers first regulation relief valve that loine pressure is dropped to 0MPa, and closes water inlet pigtail pipeline
On ball valve, it is ensured that there is no water flow process in pipeline；A drilling rod is removed, after connecting water pigtail, opens ball valve and tune in pipeline
It saves overflow valve to boost to pipeline, carries out the high-pressure hydraulic cutting operation of second drilling rod；
S3. every meter of drilling is selected to produce coal control in 200-250kg；After coal output reaches the requirement, next drilling rod is carried out
Waterpower cutting；
S4. when each waterpower is cut, when creeping into drilling rod, drilling rod is cleaned one time.
8. comprehensive management of technology according to claim 1, which is characterized in that utilize drainage pump pump drainage in the step (2)
When hydrogen sulfide in coal body, H2S drainage pump uses SP200 screw vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811208847.3A CN109488374A (en) | 2018-10-17 | 2018-10-17 | The comprehensive management of technology of hydrogen sulfide in a kind of coal working face |
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| CN201811208847.3A CN109488374A (en) | 2018-10-17 | 2018-10-17 | The comprehensive management of technology of hydrogen sulfide in a kind of coal working face |
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Family
ID=65691363
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Cited By (2)
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|---|---|---|---|---|
| CN111594265A (en) * | 2020-05-20 | 2020-08-28 | 陕西正通煤业有限责任公司 | One-hole dual-purpose technology capable of meeting underground pressure relief and hydrogen sulfide treatment requirements |
| CN112983535A (en) * | 2021-03-16 | 2021-06-18 | 重庆大学 | Soft, low-permeability and high-hydrogen sulfide coal seam zoning drilling, cutting and alkali injection treatment construction method |
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| CN112983535B (en) * | 2021-03-16 | 2022-06-03 | 重庆大学 | Soft, low-permeability and high-hydrogen sulfide coal seam zoning drilling, cutting and alkali injection treatment construction method |
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Application publication date: 20190319 |