CN112983535B - Soft, low-permeability and high-hydrogen sulfide coal seam zoning drilling, cutting and alkali injection treatment construction method - Google Patents
Soft, low-permeability and high-hydrogen sulfide coal seam zoning drilling, cutting and alkali injection treatment construction method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 95
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 94
- 239000003513 alkali Substances 0.000 title claims abstract description 78
- 238000005553 drilling Methods 0.000 title claims abstract description 70
- 238000002347 injection Methods 0.000 title claims abstract description 54
- 239000007924 injection Substances 0.000 title claims abstract description 54
- 238000010276 construction Methods 0.000 title claims abstract description 22
- 238000013316 zoning Methods 0.000 title description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000005065 mining Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000011835 investigation Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 28
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 230000005641 tunneling Effects 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 239000002585 base Substances 0.000 claims description 3
- 239000011405 expansive cement Substances 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 208000005374 Poisoning Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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Abstract
The invention discloses a construction method for treating soft, low-permeability and high-hydrogen sulfide coal seam by drilling, cutting and alkali injection in a subarea manner, which comprises the following steps of 1) detecting and dividing areas; 2) designing alkali injection parameters; 3) hydraulic slotting and drilling; 4) sealing holes; 5) drilling and alkali injection; 6) alkali injection effect investigation and hydraulic slotting and drilling parameter adjustment; 7) detecting the hydrogen sulfide emission amount in real time in the coal mining process, determining the hydrogen sulfide concentration according to a hydrogen sulfide concentration detector, modifying the hydraulic cutting seam interval in the step 3) according to the monitoring result, and simultaneously adjusting the alkali injection amount and the number of drilled holes to ensure that the hydrogen sulfide concentration is lower than the safety value of 6.6ppm when the coal seams of other areas are stoped. The invention adopts the hydraulic slotting and drilling integrated technology to enlarge the alkali injection amount and the treatment range of the coal bed, and adopts different hydraulic slotting arrangement modes according to different hydrogen sulfide content areas, thereby greatly improving the efficiency of treating the hydrogen sulfide of the coal bed and simultaneously ensuring that underground operators and related equipment are prevented from being harmed by the hydrogen sulfide.
Description
Technical Field
The invention belongs to the technical field of exploitation of hydrogen sulfide coal seams, and particularly relates to a regional drilling and cutting alkali injection treatment construction method for a soft, low-permeability and high-hydrogen sulfide coal seam.
Background
With the continuous exploitation of coal resources in China, the cases of hydrogen sulfide gushing out from coal seams are increased gradually, and the safe production of mines is seriously threatened by the abnormal gushing of hydrogen sulfide in the coal seams. The harm is mainly shown in that: 1) the adsorption capacity of hydrogen sulfide gas molecules in coal is huge and is about 90 times of that of methane, so hydrogen sulfide gushes out in a drill hole more easily; 2) hydrogen sulfide is a toxic gas, and when the concentration of the hydrogen sulfide reaches 100ppm, a human body can have serious poisoning symptoms, and when the concentration of the hydrogen sulfide reaches 700ppm, the human body can die in a short time; 3) because the underground air is moist and spray dust removal is used in the coal seam mining process, water exists on the surfaces of a plurality of devices, and hydrogen sulfide gas is easily dissolved in water, so that the hydrogen sulfide in the coal seam is dissolved in the water on the surfaces of the devices, and the hydrogen sulfide is acidic and corrodes the devices.
At present, the related theories and engineering practices for treating the hydrogen sulfide in the coal mine are not comprehensive enough, so the treatment measures are limited, and the following measures are mainly adopted: 1) increasing ventilation, and diluting hydrogen sulfide gas in the tunnel; 2) spraying alkali liquor on the roadway and the working face; 3) pre-pumping hydrogen sulfide gas in the coal seam; 4) pre-injecting alkali liquor into the coal bed. The first two methods are simple to operate and have quick response, but have little response to the high-concentration hydrogen sulfide gas enriched in the coal bed. The effect of the latter two methods in a high-permeability coal bed can relatively reach the standard, but for a soft and low-permeability coal bed, the third method is difficult to extract hydrogen sulfide gas in the coal bed, and the fourth method is difficult to inject alkali liquor into the coal bed, so that the influence range is small, and the treatment effect is poor. 5) The traditional hydraulic jet flow construction method is that firstly, a drill hole is constructed and then hydraulic jet flow is carried out, because the coal around the pre-constructed drill hole is soft and collapses in the hole, the next hydraulic jet flow is difficult to carry out, and the method is only suitable for areas with complete and hard coal beds. Therefore, an efficient alkali injection process is urgently needed for soft and low-permeability coal seams, so that the coal seams can be efficiently treated in a short time.
Disclosure of Invention
The invention aims to provide a quick and efficient alkali control treatment method special for high content of hydrogen sulfide in a soft and low permeability coal bed, so that the coal mining efficiency is ensured, the treatment cost of the hydrogen sulfide in the coal bed is greatly reduced, and the safe production is ensured.
Therefore, the technical scheme adopted by the invention is as follows: a soft, low-permeability and high-hydrogen sulfide coal seam zonal drilling and cutting alkali injection treatment construction method comprises the following steps:
1) detection and region division: constructing a plurality of hydrogen sulfide detection drill holes in the coal seam, detecting whether the concentration of hydrogen sulfide in each detection drill hole exceeds the standard or not, performing region division on an exceeding target coal seam according to the detected concentration of hydrogen sulfide to obtain three coal seam regions, namely a high coal seam region, a middle coal seam region and a low coal seam region, and then sealing the detection drill holes;
2) designing alkali injection parameters: calculating alkali mass required by each ton of coal in different coal seam regions according to the hydrogen sulfide concentration and the acid-base neutralization principle detected in the step 1), and then calculating alkali liquor amount required by different coal seam regions according to the mass concentration of alkali liquor;
3) hydraulic slotting and drilling: drilling and cutting integrated construction is carried out on different coal seam areas divided in the step 1) by adopting a drilling and cutting integrated hydraulic slotting drill, the slotting distance is determined according to the different coal seam areas divided in the step 1), and the higher the hydrogen sulfide concentration is, the smaller the slotting distance is;
4) hole sealing: selecting expansive cement, and sealing the hydraulic slotted drill hole by adopting a construction method of two plugging and one pouring;
5) drilling and alkali injection: injecting alkali liquor into the hydraulic slotted drill holes by using a grouting pump until the required amount of alkali liquor is injected into each coal seam area;
6) alkali injection effect investigation and hydraulic slotting drilling parameter adjustment: re-drilling the detection drill holes after finishing the alkali injection, detecting the concentration of hydrogen sulfide in each detection drill hole, and performing coal roadway tunneling and mining when the safety value required by the coal mine is below 6.6 ppm; if the concentration of the hydrogen sulfide is higher than the safety value, repeating the step 3) -the step 5) to perform hole sealing and hole drilling and alkali injection after increasing the hydraulic cutting and hole drilling, or repeating the step 5) to perform hole drilling and alkali injection again;
7) detecting the hydrogen sulfide emission amount in real time in the coal mining process, determining the hydrogen sulfide concentration according to a hydrogen sulfide concentration detector, modifying the hydraulic cutting seam interval in the step 3) according to the monitoring result, and simultaneously adjusting the alkali injection amount and the number of drilled holes to ensure that the hydrogen sulfide concentration is lower than the safety value of 6.6ppm when the coal seams of other areas are stoped.
Preferably, the detection drilling in the step 1) is horizontally and transversely drilled from an air inlet roadway to an air return roadway, and the detection drilling is performed at equal intervals in sequence from a working face along the tunneling direction; the hydraulic slotting drill holes in the step 3) are divided into horizontal transverse drill holes from the air inlet lane to the air return lane and from the air return lane to the air inlet lane, the depth of the hydraulic slotting drill holes is 1/2 of the width of the working face, the hydraulic slotting drill holes of the air inlet lane and the air return lane are sequentially arranged at equal intervals along the tunneling direction from the free working faces, and the hydraulic slotting drill holes of the air inlet lane and the air return lane are staggered at equal intervals from front to back. The arrangement positions and the arrangement modes of the detection drill holes and the hydraulic slotting drill holes are optimized, the number of the drill holes is reduced, and efficient alkali injection treatment is ensured.
Further preferably, in the step 3), hydraulic slotting is performed when the drilled hole reaches the slotting position, and the drilled hole is continued after the required slotting radius is reached until the next slotting position is reached, so that the whole drilling construction is finally completed. By adopting the mode of drilling and slotting, the coal around the drill hole can be prevented from being soft and influencing slotting.
More preferably, in the step 5), the alkali liquor adopts a sodium carbonate solution with the mass concentration of 1%, and the alkali injection pressure is 4-5 MPa. The sodium carbonate solution used for alkali injection has low cost, and the treatment cost of hydrogen sulfide in the coal bed is greatly reduced.
Further preferably, in the step 6), if the concentration of the hydrogen sulfide is more than twice of the safety value, repeating the steps 3) -5) and then sealing holes and injecting alkali into the drilled holes after hydraulic cutting and drilling are added; and if the concentration of the hydrogen sulfide is below two times of the safe value, repeating the step 5) and performing alkali injection again. The key for determining whether to perform hydraulic slotting drilling again is the ratio of the concentration of hydrogen sulfide to the safety value, and the method has important significance for improving the work efficiency and reducing the cost.
The invention has the beneficial effects that:
(1) firstly, constructing a plurality of hydrogen sulfide detection drill holes in a coal seam, detecting whether the concentration of hydrogen sulfide in each detection drill hole exceeds the standard or not, carrying out regional division on an exceeding standard target coal seam according to the detected concentration of hydrogen sulfide to obtain high, medium and low coal seam regions, carrying out regional treatment on the concentration of hydrogen sulfide in the coal seam, and avoiding time waste in the blind condition to carry out slot drilling on the coal seam of which the concentration of hydrogen sulfide does not exceed the standard; meanwhile, the overproof target coal seam is divided into areas according to different hydrogen sulfide concentrations, so that different slot pitches can be conveniently selected during subsequent slot drilling, and the treatment cost is saved;
(2) the drilling and cutting integrated construction is transferred to the drilling and alkali injection of the soft coal seam, so that the defect that the water jet slotting cannot be finished due to the collapse of the drilled hole due to the fact that the drilling and cutting are preformed in the traditional water jet construction process is overcome;
(3) aiming at the characteristic of low permeability of the coal bed, the alkali injection amount of the drilled holes can be greatly improved by adopting slotted drilling, so that the treatment range of the hydrogen sulfide alkali injection of the coal bed is enlarged, the treatment efficiency is improved, the exploitation of the soft, low permeability and hydrogen sulfide-containing coal bed is effectively liberated, and the utilization efficiency of coal resources is greatly improved;
(4) the hydrogen sulfide in the coal bed can be treated from the source, the contact of the hydrogen sulfide with a human body and mechanical equipment is reduced, and the safety of the human body and the good operation of the equipment are ensured;
(5) the detection drill holes are opened again after the alkali injection is finished, the hydrogen sulfide concentration in each detection drill hole is detected, the detection drill holes are recycled, and when the hydrogen sulfide concentration is higher than a safety value, hydraulic cutting and drilling are added, then hole sealing and alkali injection are carried out, or the drilling and alkali injection are carried out again, so that the follow-up safe exploitation is ensured;
(6) detecting the hydrogen sulfide emission amount in real time in the coal mining process, determining the hydrogen sulfide concentration according to a hydrogen sulfide concentration detector, modifying the hydraulic cutting seam interval according to the monitoring result, adjusting the alkali injection amount and the number of drilled holes simultaneously, ensuring that the hydrogen sulfide concentration is lower than the safety value of 6.6ppm when the coal seams of other areas are stoped, and using the hydrogen sulfide concentration as reference and reference for the stoping of the coal seams of subsequent areas.
Drawings
FIG. 1 is a schematic diagram of the construction of a exploration borehole and hydrogen sulfide zone division for a certain working surface in the present invention.
FIG. 2 shows different hydraulic cuts performed in different zones.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
with reference to fig. 1-2, a construction method for zonal drilling, cutting and alkali injection treatment of soft, low permeability and high hydrogen sulfide coal seams comprises the following steps:
1) detection and region division: constructing a plurality of hydrogen sulfide detection drill holes 3 in the coal seam, detecting whether the concentration of hydrogen sulfide in each detection drill hole 3 exceeds the standard or not, carrying out region division on the exceeding standard target coal seam according to the detected concentration of hydrogen sulfide to obtain three coal seam regions of high (region III), medium (region II) and low (region I), and then sealing the detection drill holes 3. And (4) performing subsequent alkali injection treatment on the coal bed with the hydrogen sulfide concentration not exceeding the standard.
Preferably, the detection drill holes 3 in the step 1) are horizontally and transversely drilled from the air inlet lane 1 to the air return lane 2, and are sequentially and equidistantly constructed along the tunneling direction from the working face 4.
2) Designing alkali injection parameters: calculating the alkali mass required by each ton of coal in different coal seam regions according to the hydrogen sulfide concentration and the acid-base neutralization principle detected in the step 1), and then calculating the alkali liquor amount required by different coal seam regions according to the mass concentration of the alkali liquor.
3) Hydraulic slotting and drilling: drilling and cutting integrated construction is carried out on different coal seam areas divided in the step 1) by adopting a drilling and cutting integrated hydraulic slotting drill, and the slotting distance is determined according to the different coal seam areas divided in the step 1), so that the higher the hydrogen sulfide concentration is, the smaller the slotting distance is.
Preferably, in the step 3), hydraulic slotting is carried out when the drilled hole reaches the slotting position, and the drilled hole is continued after the required slotting radius is reached until the next slotting position, and finally the whole drilling construction is finished.
In addition, the hydraulic slotted drilling in the step 3) is divided into horizontal transverse drilling from the air inlet lane 1 to the air return lane 2 and from the air return lane 2 to the air inlet lane 1, the depth of the hydraulic slotted drilling 5 is 1/2 of the width of the working face, the hydraulic slotted drilling 5 of the air inlet lane and the air return lane are sequentially arranged at equal intervals along the tunneling direction from the working face 4, and the hydraulic slotted drilling 5 of the air inlet lane 1 and the hydraulic slotted drilling 5 of the air return lane 2 are staggered at equal intervals from front to back.
4) Hole sealing: and selecting expansive cement, and sealing the hydraulic slotted drill hole by adopting a construction method of two plugging and one pouring.
5) Drilling and alkali injection: and (4) injecting alkali liquor into the hydraulic slotted drill hole by using an injection pump until the required amount of alkali liquor is injected into each coal seam area.
Preferably, in the step 5), the alkali liquor is sodium carbonate solution with the mass concentration of 1%, and the alkali injection pressure is 4-5 MPa.
6) Alkali injection effect investigation and hydraulic slotting drilling parameter adjustment: and (4) re-drilling the detection drill holes after the alkali injection is finished, and detecting the concentration of hydrogen sulfide in each detection drill hole. When the safety value required by the coal mine is less than 6.6ppm, the coal roadway can be tunneled and mined; if the concentration of the hydrogen sulfide is higher than the safety value, repeating the steps 3) -5) to increase the hydraulic cutting, hole sealing, hole drilling and alkali injection after hole drilling, or repeating the step 5) to increase the alkali injection amount and then hole drilling and alkali injection.
In the step 6), if the concentration of the hydrogen sulfide is more than twice of the safety value, repeating the step 3) -the step 5) and then sealing holes and injecting alkali into the drilled holes after hydraulic cutting and drilling are added; and if the concentration of the hydrogen sulfide is below two times of the safe value, repeating the step 5) and performing alkali injection again.
7) Detecting the hydrogen sulfide emission amount in real time in the coal mining process, determining the hydrogen sulfide concentration according to a hydrogen sulfide concentration detector, modifying the hydraulic cutting seam interval in the step 3) according to the monitoring result, and simultaneously adjusting the alkali injection amount and the number of drilled holes to ensure that the hydrogen sulfide concentration is lower than the safety value of 6.6ppm when the coal seams of other areas are stoped.
Claims (3)
1. A soft, low-permeability and high-hydrogen sulfide coal seam zonal drilling and cutting alkali injection treatment construction method is characterized by comprising the following steps:
1) detection and region division: constructing a plurality of hydrogen sulfide detection drill holes in the coal seam, detecting whether the concentration of hydrogen sulfide in each detection drill hole exceeds the standard or not, carrying out region division on the exceeding standard target coal seam according to the detected concentration of hydrogen sulfide to obtain three coal seam regions of high, middle and low, and then sealing the detection drill holes;
2) designing alkali injection parameters: calculating alkali mass required by each ton of coal in different coal seam regions according to the hydrogen sulfide concentration and the acid-base neutralization principle detected in the step 1), and then calculating alkali liquor amount required by different coal seam regions according to the mass concentration of alkali liquor;
3) hydraulic slotting and drilling: drilling and cutting integrated construction is carried out on different coal seam areas divided in the step 1) by adopting a drilling and cutting integrated hydraulic slotting drill, the slotting distance is determined according to the different coal seam areas divided in the step 1), and the higher the hydrogen sulfide concentration is, the smaller the slotting distance is;
4) hole sealing: selecting expansive cement, and sealing the hydraulic slotted drill hole by adopting a construction method of two plugging and one pouring;
5) drilling and alkali injection: injecting alkali liquor into the hydraulic slotted drill holes by using a grouting pump until the required amount of alkali liquor is injected into each coal seam area;
6) alkali injection effect investigation and hydraulic slotting and drilling parameter adjustment: re-drilling the detection drill holes after finishing the alkali injection, detecting the concentration of hydrogen sulfide in each detection drill hole, and performing coal roadway tunneling and mining when the safety value required by the coal mine is below 6.6 ppm; if the concentration of the hydrogen sulfide is higher than the safety value, repeating the step 3) -the step 5) to perform hole sealing and hole drilling and alkali injection after increasing the hydraulic cutting and hole drilling, or repeating the step 5) to perform hole drilling and alkali injection again;
7) detecting the hydrogen sulfide emission amount in real time in the coal mining process, determining the hydrogen sulfide concentration according to a hydrogen sulfide concentration detector, modifying the hydraulic slotting distance in the step 3) according to the monitoring result, and simultaneously adjusting the alkali injection amount and the number of drilled holes to ensure that the hydrogen sulfide concentration is lower than the safety value of 6.6ppm when the coal seams of other areas are stoped;
the detection drilling in the step 1) is horizontally and transversely drilled from an air inlet roadway to an air return roadway, and is sequentially and equidistantly performed from a working face along the tunneling direction; the hydraulic slotted drilling in the step 3) is divided into horizontal transverse drilling from the air inlet lane to the air return lane and from the air return lane to the air inlet lane, the depth of the hydraulic slotted drilling is 1/2 of the width of the working face, the hydraulic slotted drilling of the air inlet lane and the air return lane are sequentially arranged at equal intervals along the tunneling direction from the free working faces, and the hydraulic slotted drilling of the air inlet lane and the air return lane are staggered at equal intervals from front to back;
and 3) performing hydraulic slotting when the drilled hole reaches a slotting position, and continuing drilling until the required slotting radius is reached to the next slotting position, thereby finally completing the construction of the whole drilled hole.
2. The soft, low permeability and high hydrogen sulfide coal seam zonal drilling and cutting alkali injection treatment construction method according to claim 1, characterized in that: in the step 5), the alkali liquor adopts a sodium carbonate solution with the mass concentration of 1%, and the alkali injection pressure is 4-5 MPa.
3. The soft, low permeability and high hydrogen sulfide coal seam zonal drilling and cutting alkali injection treatment construction method according to claim 1, characterized in that: in the step 6), if the concentration of the hydrogen sulfide is more than twice of the safety value, repeating the step 3) -the step 5) and then sealing holes and injecting alkali into the drilled holes after hydraulic cutting and drilling are added; and if the concentration of the hydrogen sulfide is below two times of the safety value, repeating the step 5) and performing alkali injection again.
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| GB1402001A (en) * | 1971-10-12 | 1975-08-06 | Exxon Production Research Co | Method of withdrawing hazardous gases from subterranean formations |
| CN103615248A (en) * | 2013-11-23 | 2014-03-05 | 西南科技大学 | Top and bottom plate treatment mining technology for hydrogen sulfide-containing coal bed |
| CN104110270A (en) * | 2014-07-07 | 2014-10-22 | 辽宁工程技术大学 | Method for controlling coal bed sulfuretted hydrogen in dynamic alkali injection mode |
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