CN112324337A - Whole-process gas extraction method for through-layer top comb-shaped drilling of bottom plate of soft coal seam - Google Patents
Whole-process gas extraction method for through-layer top comb-shaped drilling of bottom plate of soft coal seam Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 95
- 238000005553 drilling Methods 0.000 title claims abstract description 70
- 238000000605 extraction Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000004080 punching Methods 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims description 27
- 239000011435 rock Substances 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 15
- 230000005641 tunneling Effects 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 5
- 239000003818 cinder Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 230000035699 permeability Effects 0.000 abstract description 7
- 230000035515 penetration Effects 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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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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Abstract
本发明属于煤矿瓦斯治理类技术领域，公开了一种松软煤层底板穿层沿顶梳状钻孔全程瓦斯抽采方法，即采用底板穿层沿顶梳状钻孔冲孔‑压裂‑冲孔增透煤层抽采瓦斯，具体步骤包括：首先在底板巷施工穿层钻孔进入煤层顶板，沿顶布置水平顺层钻孔，同时每隔25‑30m施工向下分支压裂钻孔，进入煤层底板2m；其次对分支煤孔实施水力冲孔，同时排出煤渣，逐渐增加注水压力，实现阶段封孔，启动煤层水力压裂，注水压力25MPa‑30MPa，达到目标压力和时间后停止压裂，降低注水压力再冲孔；重复以上步骤，完成全部分支钻孔增透工作；最后连接抽放管实施煤层全程瓦斯抽采。本发明适用于松软煤层，可以大幅度增加煤层透气性，降低煤层的瓦斯压力和含量，提高煤层瓦斯治理效果。
The invention belongs to the technical field of coal mine gas control, and discloses a whole-process gas drainage method for soft coal seam floor penetration along the top comb-shaped drilling, that is, punching-fracturing-punching along the top-comb-shaped drilling through floor penetration The specific steps of gas extraction from the permeability-enhancing coal seam include: firstly constructing through-layer drilling holes in the floor roadway to enter the coal seam roof, arranging horizontal bedding holes along the roof, and simultaneously constructing downward branched fracturing holes every 25-30m to enter the coal seam The bottom plate is 2m; secondly, hydraulic punching is performed on the branch coal holes, and the coal slag is discharged at the same time, and the water injection pressure is gradually increased to realize the stage sealing, and the coal seam hydraulic fracturing is started. The water injection pressure is 25MPa-30MPa. The water injection pressure is then punched; the above steps are repeated to complete the penetration enhancement of all branch holes; finally, the drainage pipe is connected to implement the whole process of coal seam gas drainage. The invention is suitable for soft coal seam, can greatly increase the permeability of coal seam, reduce the gas pressure and content of the coal seam, and improve the gas control effect of the coal seam.
Description
Technical Field
The invention belongs to the technical field of coal mine underground gas extraction permeability increase, and particularly relates to a whole-process gas extraction method for a bottom plate of a soft coal seam through-layer top comb-shaped drilling hole.
Background
Coal and gas outburst is one of major disasters of coal mines all the time, and gas extraction is a fundamental method for realizing regional gas control. However, with the increase of the coal seam mining depth, the coal seam gas content is continuously increased, the coal seam gas permeability is gradually reduced, the gas emission amount in the mining process is larger and larger, the hidden danger of gas disasters such as gas overrun, various power phenomena, coal and gas outburst accidents and the like is more and more serious, and efficient gas extraction becomes the primary task of coal mine gas control. The method aims at the problem that gas extraction of the coal seam with high pressure, softness and poor air permeability is still difficult to extract, and aims to improve the efficiency of gas treatment of the soft coal seam stope face area, increase the air permeability of the coal seam and improve the gas extraction rate. The traditional floor cross-layer drilling has the advantages of large drilling quantity, large construction work amount, long extraction period, high cost and poor effect, the drilling hole is easily blocked by coal bed coal slag and water, and the extraction problem of the soft coal bed is more serious. Therefore, a whole-course extraction method based on punching-fracturing permeability-increasing along top comb-shaped drilling holes in a bottom plate of a soft coal seam is needed to effectively solve the problems.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems of gas extraction of a high-gas soft coal seam, a whole-process gas extraction method of a bottom plate penetrating layer of the soft coal seam along a top comb-shaped drilling hole is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
a whole-course gas extraction method for a bottom plate crossing layer of a soft coal seam along a top comb-shaped drill hole comprises the following steps:
the method comprises the following steps: drilling a hole from the ground surface to a bottom plate rock stratum, arranging a drilling field at the bottom plate rock stratum, arranging drilling equipment and cement paste equipment in the drilling field, drilling an orifice pipe rock section in an inclined upward direction by using the drilling equipment, withdrawing a drill rod, then inserting an orifice pipe with the length smaller than that of the orifice pipe rock section into the orifice pipe rock section, repeatedly performing high-pressure grouting on the orifice pipe by using the cement paste equipment, filling cement paste into the orifice pipe and the orifice pipe rock section, and waiting for the cement paste to solidify;
step two: after the cement paste is solidified, drilling a coal seam hole section in an upward direction obliquely along the inside of the orifice pipe by using drilling equipment, wherein the coal seam hole section penetrates through the soft coal seam to a top rock stratum close to the top plate of the soft coal seam and then falls flat, withdrawing the drill rod, injecting high-pressure cement paste into the coal seam hole section by using the cement paste equipment, and waiting for the cement paste to be solidified;
step three: drilling holes along the coal seam hole sections by using drilling equipment, drilling a hydraulic fracturing main hole section in the roof rock stratum in the horizontal direction after the holes reach the roof rock stratum, and simultaneously constructing hydraulic fracturing in the drilling process, wherein the hydraulic fracturing penetrates through the whole hydraulic fracturing main hole section;
step four: after the hydraulic fracturing main hole section is drilled, withdrawing the drill rod, drilling a hydraulic fracturing branch hole section downwards every time the drill rod is withdrawn by a certain distance, wherein the hydraulic fracturing branch hole section penetrates through the soft coal seam to the bottom plate rock stratum, and hydraulic fracturing is simultaneously constructed in the drilling process and penetrates through the whole hydraulic fracturing branch hole section;
step five: after the hydraulic fracturing branch hole section is finished, hydraulic punching is carried out through the drill rod, after the hydraulic punching is finished, the drill rod is withdrawn to the upper end position of the hydraulic fracturing branch hole section, and the water pressure in the high-pressure drill rod is increased until the expansion hole sealing device on the drill rod is opened to seal holes;
step six: after hole sealing, continuously injecting water into the drill rod, keeping the pressure, maintaining for a certain time, closing the expansion hole sealing device after hydraulic fracturing is completed, and withdrawing the drill rod to a hydraulic fracturing main hole section;
step seven: repeating the fourth step to the sixth step to finish the drilling and hydraulic fracturing work of a plurality of hydraulic fracturing branch hole sections;
step eight: the drill rod completely exits from the hydraulic fracturing main hole section and the coal seam hole section, gas combined extraction work is implemented, after gas treatment extraction in a stope face area reaches the standard, coal roadway tunneling work is started, and working face bedding drilling pre-extraction work is implemented according to the gas treatment effect of the working face;
step nine: and (3) conveying the hydraulic fracturing main hole section to a two-plug one-injection hole packer at a leveling position, performing extraction standard-reaching evaluation by using extraction standard-reaching evaluation software in the extraction process, and starting tunneling a coal roadway after the extraction reaches the standard.
As a further preferable scheme, in the step one, an anchoring agent is used for anchoring an orifice pipe, the orifice pipe is provided with a flange cover, and the flange cover is provided with a joint for connecting the drilling equipment and the cement paste equipment.
In a further preferable scheme, in the step one, thick slurry is injected into the fixed orifice pipe firstly, then the thin slurry is injected into the fixed orifice pipe for reinforcing, after the thick slurry is solidified for 24 hours, high-pressure grouting is repeated until the pressure resistance is more than 10MPa, and the next process is carried out after the cement slurry is solidified for 48 hours.
As a further preferable scheme, in the fourth step, every time the drill pipe retreats 50-60m in the hydraulic fracturing main hole section, one hydraulic fracturing branch hole section is drilled downwards, and the bottom of the hydraulic fracturing branch hole section forms a water storage bin for containing water and coal cinder at the position of the bottom rock stratum.
As a further preferable scheme, in the sixth step, after hole sealing, water is continuously injected into the drill rod, the pressure is increased to 15MPa, and the drill rod is stabilized for 30 min.
The invention discloses a whole-course extraction method based on penetration of a bottom plate of a soft coal seam along a top comb-shaped drilling hole-fracturing permeability-increasing, which is suitable for regional gas control of a high-gas soft coal seam. The stability of a main hole is guaranteed along the top hydraulic fracturing when the bottom plate penetrates through the coal seam by solidifying the soft coal seam through drilling, then hydraulic fracturing branch holes are constructed by sequentially utilizing the main hole, hydraulic punching is firstly carried out in the branch holes, and a part of soft coal is flushed out to play a role in preliminary pressure relief and permeability increase; hydraulic fracturing is continuously carried out after the punching, which is beneficial to further fracturing the coal body, communicating the fracture and expanding the pressure relief influence range; and hydraulic punching is carried out on the basis of fracturing again, coal bodies around the holes are washed back and forth, pressure relief spaces around the holes are increased, and the migration of the coal bodies around the holes under the action of the ground stress in the extraction process is facilitated, so that the air permeability of a coal seam is increased, the drainage radius of a drill hole is increased, the single-hole extraction efficiency is improved, the extraction time is shortened, and the cost is saved.
Drawings
FIG. 1 is a cross-sectional view of a grouting securing orifice pipe of the present invention;
FIG. 2 is a cross-sectional view of a solidified coal pore section of a hydraulic pressure main drilling hole according to the present invention;
FIG. 3 is a cross-sectional view of the soft coal seam floor through the top comb borehole arrangement in accordance with the present invention;
the method comprises the following steps of 1-drilling field, 2-orifice pipe rock hole section, 3-orifice pipe, 4-coal bed hole section, 5-hydraulic fracturing main hole section and 6-hydraulic fracturing branch hole section.
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 invention relates to a whole-course gas extraction technology based on a soft coal seam floor crossing layer along a top comb-shaped drilling hole, which mainly comprises six steps, namely, fixing a hole pipe; secondly, solidifying the soft coal seam layer-penetrating holes; thirdly, constructing a horizontal main drilling hole of the top plate; fourthly, constructing a cross-layer branch drilling hole in a 'retreating mode'; fifthly, branch drilling and punching, fracturing and punching; sixthly, hole sealing and drainage.
As shown in fig. 1, a floor roadway is arranged in the middle below a treatment working surface of a planned area, the floor roadway is located at a position 10-15m away from a coal seam floor, drilling sites 1 are arranged on two sides of the floor roadway, and each device including a drilling device and a cement slurry device is arranged in each drilling site 1; the method is characterized in that a cross-layer drilling hole opening pipe rock section 2 is solidified by multiple times of high-pressure grouting, and the specific process comprises the following steps:
firstly, drilling with the depth of 10m and the diameter of 133mm, forming a hole section 2 of a hole pipe, putting a hole pipe 3 with a flange plate and the length of 10m and the diameter of 133mm, anchoring the hole pipe by adopting an anchoring agent, repeating high-pressure grouting until the pressure resistance is more than 10MPa, and after cement slurry is solidified for 48 hours, constructing a through-layer drilling hole.
As shown in fig. 2, the flange plate cover is opened, the construction of cross-layer drilling is continued, the diameter of the drilled hole is 113mm, the drilled hole is leveled after entering the coal seam roof for 2m, a coal seam hole section 4 is formed, namely, the drill rod is withdrawn, the flange plate cover is fixed, high-pressure cement slurry is injected through a grouting valve, the grouting must be performed by firstly thin slurry and then thick slurry when the soft coal is cured for drilling, the grouting pressure is 15MPa, the grouting valve is closed after the grouting is completed, the cement slurry penetrates into the coal seam hole section 4, and the subsequent construction work of fracturing holes can be performed after the cement slurry is solidified for 48 hours.
As shown in fig. 3, a directional drilling machine is used for sweeping holes, the diameter of each drilled hole is 95mm, hydraulic fracturing is conducted on the back edge of the coal seam roof to form a hydraulic fracturing main hole section 5, the hydraulic fracturing main hole section 5 penetrates through the top rock stratum on the whole coal seam roof, directional drill rods are withdrawn section by section, hydraulic fracturing is conducted downwards every 50-60m to form a hydraulic fracturing branch hole section 6, the diameter of each drilled hole is 95mm, the drilled holes penetrate through the coal seam and enter the bottom plate of the coal seam for 2m, a water storage bin with the depth of not less than 2m is formed, the problem that water and coal cinder cannot be discharged in the later period is accumulated is solved, the inhibition effect of the water and coal cinder on the gas release.
And (2) starting hydraulic punching after constructing a branch fracturing hole, namely enabling high-pressure water to pass through a high-seal drill rod, ejecting high-pressure water jet by using a punching drill bit to flush the coal body, simultaneously rotating the drill rod, discharging a coal-water mixture and gas through a drilled hole, wherein the water injection pressure is not lower than 10MPa, the punched coal quantity is about 1.2t/m, and the specific punched coal quantity is required to be adjusted according to the hardness degree of the coal body. After hydraulic punching is completed, the directional drill rod is withdrawn to a branch hole rock section, a high-pressure hole packer is installed while drilling, after hydraulic fracturing branch drilling is completed, the drill rod is withdrawn to the branch hole rock section, water pressure in the high-pressure drill rod is increased, when the pressure is increased to 10MPa, a one-way valve of the high-pressure rubber hole packer while drilling is automatically opened, the rubber hole packer expands along with the increase of the water pressure, and finally high-pressure hole packing while drilling is achieved.
When the pressure is continuously increased to 15MPa, the pressure is stabilized for 30min and the interval is 5MPa until the coal seam initiation pressure reaches 20-25MPa, the hydraulic fracturing pump pressure is 35MPa, and the water injection quantity is 100-150m3And adjusting the water injection pressure and the water injection quantity of each fracturing hole according to the actual coal bed conditions, closing the valve of the expansion hole packer after hydraulic fracturing is completed, recovering the drilling state, repeating the steps, performing hydraulic punching, and installing a gas-liquid-solid three-phase separation device for preventing the water injection holes at the orifices.
And after the punching, fracturing and punching work of all the branch drill holes is finished, the gas combined extraction work is implemented. After gas treatment extraction in a stope face region reaches the standard, coal roadway tunneling work is started, and working face bedding drilling hole pre-pumping work is implemented according to the gas treatment effect supplement of the working face.
And (3) when all the branch drilling holes are subjected to all the measures of punching, fracturing and punching, withdrawing the directional drilling machine, and sending the branch drilling holes into a two-hole one-injection hole packer, namely an FK-4/20 rubber hole packer, wherein the hole packing depth reaches the flat position of a hydraulic fracturing main hole, the cement used for grouting needs to be expansion cement, and the grouting pressure is not lower than 2 MPa.
And performing extraction standard-reaching evaluation by using extraction standard-reaching evaluation software in the extraction process, and when the extraction reaches the standard, starting tunneling a coal roadway and implementing regional and local four-in-one comprehensive measures strictly according to the requirements of prevention and control of coal and gas outburst fine rules.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A whole-course gas extraction method for a bottom plate crossing layer of a soft coal seam along a top comb-shaped drill hole is characterized by comprising the following steps:
the method comprises the following steps: drilling a hole from the ground surface to a bottom plate rock stratum, arranging a drilling field (1) at the bottom plate rock stratum, arranging drilling equipment and cement paste equipment in the drilling field (1), drilling an orifice pipe rock hole section (2) in an inclined upward direction by using the drilling equipment, withdrawing a drill rod, inserting an orifice pipe (3) with the length being smaller than that of the orifice pipe rock hole section (2) into the orifice pipe rock hole section (2), repeatedly performing high-pressure grouting on the orifice pipe (3) by using the cement paste equipment, filling cement paste in the orifice pipe (3) and the orifice pipe rock hole section (2), and waiting for solidification of the cement paste;
step two: after the cement paste is solidified, drilling a coal seam hole section (4) in an upward direction from the inside of the orifice pipe (3) by using drilling equipment, enabling the coal seam hole section (4) to penetrate through the soft coal seam to a top rock stratum close to the top plate of the soft coal seam and then fall down, withdrawing the drill rod, injecting high-pressure cement paste into the coal seam hole section (4) by using the cement paste equipment, and waiting for the cement paste to be solidified;
step three: drilling a hole along the coal seam hole section (4) by using drilling equipment, drilling a hydraulic fracturing main hole section (5) in the top plate rock stratum in the horizontal direction after the hole reaches the top plate rock stratum, and simultaneously constructing hydraulic fracturing in the drilling process, wherein the hydraulic fracturing penetrates through the whole hydraulic fracturing main hole section (5);
step four: after the hydraulic fracturing main hole section (5) is drilled, the drill rod is withdrawn, and when the drill rod is withdrawn for a certain distance, the hydraulic fracturing branch hole section (6) is drilled downwards, the hydraulic fracturing branch hole section (6) penetrates through the soft coal seam to the bottom rock stratum, hydraulic fracturing is simultaneously constructed in the drilling process, and the hydraulic fracturing penetrates through the whole hydraulic fracturing branch hole section (6);
step five: after the hydraulic fracturing branch hole section (6) is finished, hydraulic punching is carried out through the drill rod, after the hydraulic punching is finished, the drill rod is withdrawn to the upper end position of the hydraulic fracturing branch hole section (6), and the water pressure in the high-pressure drill rod is increased until the expansion hole packer on the drill rod is opened to carry out hole sealing;
step six: after hole sealing, continuously injecting water into the drill rod, keeping the pressure, maintaining for a certain time, closing the expansion hole sealing device after hydraulic fracturing is completed, and withdrawing the drill rod to a hydraulic fracturing main hole section (5);
step seven: repeating the fourth step to the sixth step to finish the drilling and hydraulic fracturing work of a plurality of hydraulic fracturing branch hole sections (6);
step eight: the drill rod completely exits from the hydraulic fracturing main hole section (5) and the coal seam hole section (4), gas combined extraction work is carried out, after gas treatment extraction in a stope face area reaches the standard, coal roadway tunneling work is started, and working face bedding drilling pre-extraction work is implemented according to the gas treatment effect of a working face;
step nine: and (3) conveying the flat position of the hydraulic fracturing main hole section (5) into an FK-4/20 rubber hole packer, performing extraction standard-reaching evaluation by using extraction standard-reaching evaluation software in the extraction process, and starting tunneling a coal roadway after the extraction reaches the standard.
2. The whole-course gas extraction method for the bottom plate of the soft coal seam through the top comb-shaped drill hole according to claim 1, characterized by comprising the following steps of: in the first step, an anchoring agent is adopted to anchor the orifice pipe (3), a flange plate cover is arranged at the pipe orifice of the orifice pipe (3), and a joint for connecting drilling equipment and cement paste equipment is arranged on the flange plate cover.
3. The whole-course gas extraction method for the bottom plate of the soft coal seam through the top comb-shaped drill hole according to claim 1, characterized by comprising the following steps of: in the first step, thick slurry is injected into the fixed orifice pipe (3) firstly during grouting, then the thin slurry is injected into the fixed orifice pipe (3) to strengthen the fixed orifice pipe, after the thick slurry is solidified for 24 hours, high-pressure grouting is repeated until the pressure resistance is more than 10MPa, and the next procedure is carried out after cement slurry is solidified for 48 hours.
4. The whole-course gas extraction method for the bottom plate of the soft coal seam through the top comb-shaped drill hole according to claim 1, characterized by comprising the following steps of: in the fourth step, when the drill rod is withdrawn by 50-60m in the hydraulic fracturing main hole section (5), one hydraulic fracturing branch hole section (6) is drilled downwards, and a water storage bin for containing water and coal cinder is formed at the bottom of the hydraulic fracturing branch hole section (6) at the position of the bottom rock stratum.
5. The whole-course gas extraction method for the bottom plate of the soft coal seam through the top comb-shaped drill hole according to claim 1, characterized by comprising the following steps of: and in the sixth step, after hole sealing, continuously injecting water into the drill rod, increasing the pressure to 15MPa, and stabilizing for 30 min.
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| CN202011224078.3A CN112324337B (en) | 2020-11-05 | 2020-11-05 | A whole-process gas drainage method for comb-shaped drilling along the top of the soft coal seam floor |
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| CN202011224078.3A CN112324337B (en) | 2020-11-05 | 2020-11-05 | A whole-process gas drainage method for comb-shaped drilling along the top of the soft coal seam floor |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113107579A (en) * | 2021-04-30 | 2021-07-13 | 中国矿业大学 | Directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method |
| CN113417636A (en) * | 2021-05-31 | 2021-09-21 | 中煤科工集团重庆研究院有限公司 | Accurate hydraulic fracturing process for comb-shaped layer-through directional long-drilling branch hole coal seam section |
| CN113565485A (en) * | 2021-09-01 | 2021-10-29 | 中煤科工集团重庆研究院有限公司 | Accurate hydraulic fracturing equipment of directional long drilling of pectination wearing layer |
| CN113775372A (en) * | 2021-09-30 | 2021-12-10 | 太原理工大学 | Method for extracting coal seam gas by coal mine fixed-point fracturing |
| CN114046149A (en) * | 2021-11-01 | 2022-02-15 | 北京天地华泰矿业管理股份有限公司 | Hydraulic coal-digging outburst-eliminating method for directional long drilling holes through layer holes |
| CN114483160A (en) * | 2021-12-28 | 2022-05-13 | 西安交通大学 | Gas extraction method for connecting roadway |
| CN114635742A (en) * | 2022-03-28 | 2022-06-17 | 韩城市枣庄实业有限公司 | A system and method for hydraulic fracturing hole protection in crushed soft coal seam |
| CN114737970A (en) * | 2022-04-02 | 2022-07-12 | 陕西长武亭南煤业有限责任公司 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method |
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| CN113107579A (en) * | 2021-04-30 | 2021-07-13 | 中国矿业大学 | Directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method |
| CN113417636A (en) * | 2021-05-31 | 2021-09-21 | 中煤科工集团重庆研究院有限公司 | Accurate hydraulic fracturing process for comb-shaped layer-through directional long-drilling branch hole coal seam section |
| CN113565485A (en) * | 2021-09-01 | 2021-10-29 | 中煤科工集团重庆研究院有限公司 | Accurate hydraulic fracturing equipment of directional long drilling of pectination wearing layer |
| CN113775372A (en) * | 2021-09-30 | 2021-12-10 | 太原理工大学 | Method for extracting coal seam gas by coal mine fixed-point fracturing |
| CN114046149A (en) * | 2021-11-01 | 2022-02-15 | 北京天地华泰矿业管理股份有限公司 | Hydraulic coal-digging outburst-eliminating method for directional long drilling holes through layer holes |
| CN114483160A (en) * | 2021-12-28 | 2022-05-13 | 西安交通大学 | Gas extraction method for connecting roadway |
| CN114635742A (en) * | 2022-03-28 | 2022-06-17 | 韩城市枣庄实业有限公司 | A system and method for hydraulic fracturing hole protection in crushed soft coal seam |
| CN114737970A (en) * | 2022-04-02 | 2022-07-12 | 陕西长武亭南煤业有限责任公司 | Pre-crack hydraulic fracturing roof cutting pressure relief construction method |
| CN114837555A (en) * | 2022-05-05 | 2022-08-02 | 陕西彬长孟村矿业有限公司 | Feather-shaped multifunctional directional drilling hole arrangement method |
| CN115163023A (en) * | 2022-08-03 | 2022-10-11 | 中煤科工集团重庆研究院有限公司 | Close-distance coal seam group gas combined efficient extraction method |
| CN115263264A (en) * | 2022-08-03 | 2022-11-01 | 中煤科工集团重庆研究院有限公司 | Method for coordinately and efficiently extracting gas of close-distance coal seam group mining layer and adjacent layer |
| CN115163023B (en) * | 2022-08-03 | 2023-11-07 | 中煤科工集团重庆研究院有限公司 | Close-range coal seam group gas combined efficient extraction method |
| CN115263264B (en) * | 2022-08-03 | 2023-11-07 | 中煤科工集团重庆研究院有限公司 | Efficient extraction method for gas coordination of close-range coal seam group mining layer and adjacent layer |
| CN115387774A (en) * | 2022-09-15 | 2022-11-25 | 中煤科工集团重庆研究院有限公司 | Multipurpose full-time-space efficient gas treatment method for one hole of outburst coal seam working face |
| CN115387774B (en) * | 2022-09-15 | 2023-08-08 | 中煤科工集团重庆研究院有限公司 | Multi-purpose full-time space efficient gas control method for working face of protruding coal seam |
| CN115522890A (en) * | 2022-10-25 | 2022-12-27 | 中国矿业大学 | Drilling and hole sealing process |
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