CN113107579B - Directional long drilling combined bottom plate cross drilling stereoscopic gas extraction method - Google Patents
Directional long drilling combined bottom plate cross drilling stereoscopic gas extraction method Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 167
- 238000000605 extraction Methods 0.000 title claims abstract description 74
- 239000003245 coal Substances 0.000 claims abstract description 113
- 239000011435 rock Substances 0.000 claims abstract description 35
- 238000004080 punching Methods 0.000 claims abstract description 31
- 238000005065 mining Methods 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 20
- 230000005641 tunneling Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 claims abstract description 10
- 230000000149 penetrating effect Effects 0.000 claims description 53
- 238000007789 sealing Methods 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000003795 desorption Methods 0.000 abstract description 2
- 239000004047 hole gas Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 230000035699 permeability Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011405 expansive cement Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007711 solidification Methods 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
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- E21B7/04—Directional drilling
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Abstract
The invention discloses a directional long drill hole and bottom plate cross-layer drill hole combined stereoscopic gas extraction method, which comprises the steps of constructing directional cross-layer main drill holes to a top bottom plate of a coal bed through a rock roadway of the bottom plate of the coal bed, constructing cross-layer branch drill holes at intervals of 20-30m, performing hydraulic punching operation on each branch hole, enabling the punching pressure to be not lower than 10MPa, connecting a drainage pipe to perform pre-mining coal bed gas extraction, mining pressure relief gas extraction during working face tunneling and stoping and post-mining old goaf gas extraction after all drilling construction and punching processes are completed, and serving the whole process. The invention utilizes the crossing directional drilling holes of the coal seam top and bottom plates to cross the coal seam, adopts a hydraulic permeability-increasing measure to realize the pre-pumping of the coal seam gas, simultaneously, the mining operation further loosens the coal rock layer, promotes the gas desorption, improves the directional long drilling hole gas pumping effect, simultaneously, one bottom plate roadway can serve 1-2 stoping faces, greatly reduces the rock roadway tunneling engineering quantity, effectively relieves the shortage of 'pumping, digging and mining' succession of a mine, and promotes the efficient and intensive development of the mine.
Description
Technical Field
The invention belongs to the technical field of coal mine underground coal seam gas extraction, and particularly relates to a directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method.
Background
At present, coal is still in a vital position in the energy structure of China. In 2019, the proportion of coal consumption in China accounts for 57.7% of the total energy consumption, and the proportion of coal consumption is estimated to be about 57.5% in 2020. Along with the continuous deepening of the coal mining depth in China, the gas content and the pressure of the coal bed are increased. Meanwhile, most coal seams in China are low-permeability coal seams, so that gas pre-drainage is difficult, but gas emission amount in the mining process is increased, which is also the reason why many mine coal and gas outburst accidents occur frequently in China. The situation that mines face high ground stress and high gas stress in China is increasingly common, and the poor coal seam gas permeability seriously restricts the efficient intensive safe mining of the mines, so that research on a high-efficiency gas extraction method of the high-pressure low-gas-permeability coal seam is urgently needed.
With the development of the directional drilling technology in China, the occupation ratio of the directional long drill hole in the gas extraction of the underground coal mine is continuously improved, and various possibilities are provided for the gas extraction scheme of the underground coal mine. Meanwhile, the mechanization degree of the coal mine in China develops rapidly, the mining intensity is high, the propelling speed is high, the mining and replacing are compact, the time for extracting the coal seam gas is usually reserved and is relatively short, and the efficient intensive mining and safe production of the coal mine are severely restricted. The high-efficiency extraction of the coal bed gas with high pressure and poor air permeability is still the key and difficult point of gas control. In order to improve the gas treatment efficiency of a stope face region, increase the gas permeability of a coal seam and improve the gas extraction rate, a plurality of bottom plate rock roadways are required to be arranged on one working face for the traditional bottom plate cross-layer drilling, and in addition, the construction drilling quantity is large, the engineering quantity is large, the extraction period is long, the cost is high, the effect is poor, so that the 'extraction, excavation and mining' connection of a mine is easy to unbalance. In recent years, along with the wide application and popularization of directional drilling in underground coal mines, basic conditions are provided for the improvement of a mine gas extraction process. Therefore, how to improve the gas treatment efficiency of the stope face area, shorten the gas extraction standard reaching time, reduce the construction workload of a roadway and a drill hole, increase the air permeability of a coal seam, improve the utilization rate of the extraction drill hole and have very important significance for the safe production and the efficient intensive development of a coal mine.
Disclosure of Invention
The invention provides a directional long-drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method, aiming at solving the problems of large construction work amount, long extraction standard reaching time, poor extraction effect and high cost in the traditional bottom plate roadway cross-layer drilling technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
a directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method comprises the following steps:
the method comprises the following steps: arranging a drill site in a rock roadway where a coal seam bottom plate is located, arranging a slurry pump in the drill site, constructing and drilling a section of straight hole towards the direction of a coal seam top plate, inserting an orifice pipe into the straight hole, exposing the orifice section of the orifice pipe out of the straight hole, fixing the orifice pipe in the straight hole, installing a flange plate cover on the orifice of the orifice pipe, sealing a gap between the orifice pipe and the straight hole, and finally starting the slurry pump to pressurize and inject slurry into the orifice pipe and the straight hole through a slurry injection pipe;
step two: after the slurry in the orifice pipe and the straight hole is solidified, opening a flange plate cover, drilling a top plate through layer directional drilling main hole coal-rock layer section in the direction of the coal seam roof along the central construction of the orifice pipe, turning to be horizontal and flat after penetrating the coal seam roof, enabling the flat position to be located in a stable extraction layer, withdrawing a drill rod, tightening the flange plate cover, and performing pressurized grouting and sealing on the top plate through layer directional drilling main hole coal-rock layer section through a grouting pipe;
step three: and after cement slurry in the main hole coal-rock layer section of the roof cross-layer directional drilling is solidified, drilling the main hole coal-rock layer section of the roof cross-layer directional drilling by using a directional drilling machine, and drilling the main hole of the roof cross-layer directional drilling in the horizontal direction after reaching the stable pumping layer.
Step four: retreating to construct a roof penetrating directional drilling branch hole, withdrawing the drill rod section by section from a roof penetrating directional drilling main hole, intermittently constructing the roof penetrating directional drilling branch hole towards the coal bed direction, and penetrating the roof penetrating directional drilling branch hole through the coal bed area of the working face;
step five: after the top plate layer-penetrating directional drilling branch hole is punched, performing hydraulic pressurization punching measures on the top plate layer-penetrating directional drilling branch hole during the period of drilling and withdrawing the rod, and withdrawing the rod to the top plate layer-penetrating directional drilling main hole after the punching of the top plate layer-penetrating directional drilling branch hole is completed;
step six: repeating the fourth step and the fifth step, after the punching work of all the roof penetrating directional drilling branch holes is completed, sealing the holes to the junction of the roof penetrating directional drilling main hole coal-rock layer section and the stable pumping layer, and then performing gas grid-connected continuous pumping work on the roof penetrating directional drilling main holes;
step seven: constructing a bottom plate through-layer directional drilling main hole in the horizontal direction of a coal seam bottom plate at a drilling field in the coal seam bottom plate, wherein the bottom plate through-layer directional drilling main hole transversely penetrates through the coal seam bottom plate area of a working surface, after the bottom plate through-layer directional drilling main hole is constructed in place, withdrawing a directional drilling rod section by section, intermittently constructing bottom plate through-layer directional drilling branch holes in the coal seam direction, the bottom plate through-layer directional drilling branch holes penetrate through the coal seam area of the working surface, and the bottom plate through-layer directional drilling branch holes and the top plate through-layer directional drilling branch holes are inserted into the coal seam in a staggered mode;
step eight: after the punching of the floor penetrating directional drilling branch holes is completed, the rods are retreated to the floor penetrating directional drilling main holes, and after the punching of all the floor penetrating directional drilling branch holes is completed, hole sealing is performed to the floor penetrating directional drilling main holes to perform gas grid-connected continuous pumping work;
step nine: and constructing at least one bottom plate cross-layer drilling hole aiming at the coal seam region between a top plate cross-layer directional drilling hole main hole and a bottom plate cross-layer directional drilling hole main hole which are respectively arranged on a stable pumping layer and a coal seam bottom plate, finishing hydraulic punching operation after drilling, and performing gas grid-connected pumping work on the bottom plate cross-layer drilling hole by hole sealing.
Step ten: and performing extraction evaluation to reach the standard by using extraction standard-reaching evaluation software in the extraction process, and starting tunneling the coal roadway after the extraction reaches the standard.
As a further preferable scheme, in the step one, a section of straight hole is constructed towards the direction of the coal seam roof, the hole diameter of the hole is phi 133mm, the depth is 10m, the diameter of the flange plate cover is phi 127mm, the hole section of the hole pipe is exposed for 20-30cm, and an anchoring agent is adopted to anchor and seal the gap between the hole pipe and the straight hole; and pressurizing and grouting the orifice pipe and the straight hole until the pressure resistance is more than 5 MPa.
As a further preferable scheme, in the second step, the aperture of the main hole coal-rock layer section of the roof penetrating directional drilling is phi 115mm, the grouting pressure in the main hole coal-rock layer section of the roof penetrating directional drilling is 10MPa, the vertical distance between the stable pumping layer and the coal bed is generally kept about 20m, or the mining height is at least 4-5 times of the mining height according to the actual mining height and geological conditions of the stope face.
As a further preferred solution, the diameter of the drilled hole in step three is φ 96mm.
As a further preferable scheme, in the fourth step, a roof penetrating directional drilling branch hole is constructed at intervals of 20-30 m; and seventhly, constructing a floor penetrating directional drilling branch hole at intervals of 20-30 m.
As a further preferable scheme, the punching pressure is more than or equal to 10MPa, and the punching coal amount is about 1.2t/m to 1.5t/m.
The invention discloses a directional long drilling combined bottom plate cross drilling stereoscopic gas extraction method, which has the following beneficial effects:
1. the whole set of coal seam top and bottom plate cross-layer drill holes can serve the preparation, recovery and recovery closed stages of the whole working face, and complete the whole service process of pre-extraction of coal seam gas, working face tunneling, extraction of mining pressure-relief gas during the recovery period and extraction of gas in a post-mining old goaf.
2. The soft coal section of the roof cross drilled hole is solidified, so that effective pore forming of the roof cross drilled hole in the construction of the floor of the coal seam is guaranteed, the risk of hole wall collapse of the soft coal section during hydraulic punching is avoided, hydraulic punching operation is smoothly performed on the roof cross branched hole, the process has a pressure relief and permeability increasing effect on an original coal seam, the effective extraction radius of each branched hole is effectively improved, and the whole-process regional gas extraction is facilitated.
3. The coal seam top and bottom plate cross-layer drill holes cross through the coal seam, and a hydraulic anti-reflection measure is adopted, so that coal bodies can be effectively loosened, gas desorption is promoted, and the gas pumping effect of the directional long drill holes is improved. Secondly, after the gas of the pre-pumped coal seam in the area reaches the standard, the working face excavating operation is started, the coal seam and the surrounding rocks of the coal rock mass overlying the coal seam are further loosened, the coal rock mass is disturbed in a large range for multiple times to form a gas escape channel, the gas is effectively excavated and extracted while being subjected to directional roof and floor crossing main drill holes and branch holes, the whole process is served, and a directional long drill hole and floor crossing drill hole combined three-dimensional whole-course gas extraction system is formed.
4. The invention discloses a directional long drilling combined bottom plate cross drilling three-dimensional gas extraction method, which comprises the steps of carrying out hydraulic punching and hole sealing connection pipe pre-extraction on a top bottom plate directional cross drilling long hole in a bottom plate roadway to construct a coal seam, carrying out grid-connected continuous extraction after hydraulic punching of all directional cross drilling holes in the bottom plate roadway is finished, carrying out pre-extraction for a period of time, starting tunneling a working face coal roadway above the bottom plate roadway after gas extraction reaches the standard, and tunneling an adjacent preparation working face coal roadway according to the pre-extraction effect of the directional cross drilling holes to determine whether tunneling of the adjacent preparation working face coal roadway is achieved or a supplementary area measure is achieved and then tunneling. The invention realizes pre-pumping of gas in a stope face area in advance by using a directional drilling construction technology, does not damage the extraction function of a main hole of a directional cross-layer drilling of a coal seam roof during preparation and stope of the working face, simultaneously can serve 1-2 stope faces by one bottom plate lane, can greatly reduce the tunneling of the bottom plate rock lane, reduce the engineering quantity, simultaneously realize a large-area three-dimensional whole-process extraction process technology, effectively relieve the shortage of ' pumping, digging and mining ' succession ' of a mine and promote the efficient intensive development of the mine.
Drawings
FIG. 1 is a cross-sectional view of a fixed orifice tube for roof cross-hole grouting in accordance with the present invention;
FIG. 2 is a sectional view of the arrangement of a directional layer-penetrating long drill hole of a three-dimensional whole-course gas extraction top and bottom plate of the invention;
reference numerals are as follows: 1-rock lane; 2, drilling field; 3-a coal seam floor; 4-cement slurry; 5-orifice tube; 6, a flange plate cover; 7-high pressure ball valve; 8, grouting pipes; 9-a slurry pump; 10, drilling a main hole in a layer-penetrating and directional manner on a top plate; 11-drilling a bottom plate through a layer; 12-drilling a main hole in a layer-penetrating and directional manner on the bottom plate; 13-a coal seam; 14-drilling branch holes in a layer-penetrating and oriented manner on the bottom plate; 15-drilling branch holes in a roof through layer in a directional manner; 16-coal seam roof; 17-directionally drilling a main hole coal-rock layer section through a top plate layer; 18-stable extraction layer; 19-junction.
Detailed Description
The technical solutions of the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly defined.
As shown in the figures 1 and 2, the directional long drilling and floor crossing drilling combined stereoscopic gas extraction method disclosed by the invention realizes pre-extraction of gas in a stope face region in advance by utilizing a directional drilling construction technology, the extraction function of a main hole of a directional crossing drilling hole of a coal seam roof is not damaged during preparation and stoping of a working face, and meanwhile, one floor lane can serve 1-2 stope faces, so that the tunneling of the floor rock lane can be greatly reduced, the engineering quantity is reduced, a large-area stereoscopic whole-process extraction process technology is realized, the condition of lack of ' pumping, tunneling and mining ' connection ' of a mine is effectively relieved, and the efficient intensive development of the mine is promoted.
In order to achieve the purpose, the invention provides a directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method, which takes the case that a bottom plate rock roadway single wing covers one working surface, and the specific implementation comprises the following steps:
1. and arranging a drill site 2 on the coal seam floor rock roadway 1 to construct a hole pipe rock hole section towards the coal seam roof. The hole diameter phi 133mm and the depth 10m or so are drilled, the orifice pipe 5 with the length of 10m and the phi 127mm is put in after the drill is pulled out, the orifice section is exposed for 20-30cm, the orifice pipe 5 is anchored by adopting an anchoring agent, after a flange cover or a blank cover 6 is arranged, a slurry pump 9 is started to carry out pressurized slurry injection on the orifice pipe 5 through a slurry injection pipe 8 until the pressure resistance is more than 5 MPa.
2. After the slurry is solidified for 24 hours, opening the flange cover or the blank cover 6, constructing a coal seam roof crossing directional drilling main hole coal-rock layer section 17 along the center of the orifice pipe 5, opening the hole with the diameter phi of 115mm, after the coal seam roof crossing 16 reaches the level of the stable extraction layer 18, withdrawing the drill rod, tightening the flange cover or the blank cover 6, connecting a grouting pipeline 8, performing pressurized grouting on the drilled hole through a grouting control ball valve 7, grouting at the pressure of 10MPa, performing grouting solidification on the top plate crossing directional drilling main hole coal-rock layer section 17, and ensuring the stability of the wall of the extraction main hole in the gas extraction stage during the later working face stoping period.
3. And after the cement slurry is solidified for 48 hours, constructing a main roof penetrating hole, changing the diameter phi of 96mm, sweeping the hole along the center of the orifice pipe 5, and drilling a main roof penetrating directional hole 10 along the horizontal direction after the hole reaches a stable pumping layer 18.
And 4, constructing a roof penetrating branch drill hole in a retreating mode, withdrawing the drill rod section by section from the roof penetrating directional drilling main hole 10, constructing branch drill holes 15 at intervals of 20-30m, and enabling the drill holes to penetrate through the coal seam and enter the coal seam floor by 0.5m.
5. And (3) performing hydraulic punching measures on the coal seam when a roof penetrating directional drilling branch hole 15 is constructed and the rod is withdrawn after the drilling is finished, wherein the punching pressure is not lower than 10MPa, the punching coal quantity is about 1.2t/m, and the specific punching coal quantity is adjusted according to the actual coal seam geological conditions. And after the hydraulic punching of the branch drilling is finished, the rod is retreated to the main drilling section.
6. And (4) repeating the step (4-5), after the punching work of all the branch drill holes of the coal seam roof is finished, carrying out gas grid-connected continuous pumping work on the main hole (10) of the through-layer directional drill hole of the roof by hole sealing, wherein the hole sealing depth reaches the junction (19) of the coal seam roof, the cement used for grouting is expansive cement, and the grouting pressure is not less than 2MPa.
7. And (2) constructing a bottom plate penetrating directional drilling main hole 12 to the bottom plate of the coal seam on a drilling field 3 of the coal seam bottom plate, penetrating through the whole working surface coal seam bottom plate area, withdrawing the directional drilling rod section by section after the main hole is constructed in place, constructing bottom plate penetrating directional drilling branch holes 14 to the coal seam at intervals of 20-30m, enabling the drilling holes to penetrate through the coal seam and enter the coal seam top plate by 0.5m, and enabling a coal-seeing point of each bottom plate penetrating directional drilling branch hole 14 to be located at a trisection point where a coal-passing point connecting line of two adjacent branch holes 15 of the top plate penetrating is close to a bottom plate roadway.
8. After a floor penetrating directional drilling branch hole 14 is constructed, hydraulic pressurization punching measures are carried out on the floor penetrating directional drilling branch hole 14 in the period of drilling and withdrawing the rod, after the floor penetrating directional drilling branch hole 14 is punched, the rod is withdrawn to a floor penetrating directional drilling main hole 12, after the punching work of all the floor penetrating directional drilling branch holes 14 is completed, the hole sealing carries out gas grid-connected continuous pumping work on the floor penetrating directional drilling main hole 12, the hole sealing depth is not less than 20m, cement used for grouting is expansion cement, and the grouting pressure is not less than 2MPa.
9. And (3) extracting a blank zone in a coal seam 13 area above the bottom plate rock roadway 1 caused by directional cross-layer drilling arranged on the stable extraction layer 18 and the coal seam bottom plate 3, completing hydraulic punching operation after hole patching is performed on the cross-layer drilling 11 of the construction bottom plate, performing gas grid-connected continuous extraction work on the group of cross-layer drilling 11 by hole sealing, sealing the holes to a coal rock junction, wherein cement used for grouting is expansion cement, and the grouting pressure is not less than 2MPa.
10. And in the extraction process, extraction evaluation is carried out to reach the standard by using extraction standard-reaching evaluation software, and when the extraction reaches the standard, the coal roadway starts to be tunneled. Meanwhile, comprehensive measures of regional and local 'four-in-one' are strictly implemented according to 'fine rules for preventing and controlling coal and gas outburst'.
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 (6)
1. A directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method is characterized by comprising the following steps:
the method comprises the following steps: arranging a drill site (2) in a rock roadway (1) where a coal seam bottom plate (3) is located, arranging a slurry pump (9) in the drill site (2), drilling a section of straight hole in the direction of a coal seam top plate (16), inserting an orifice pipe (5) into the straight hole, exposing the orifice section of the orifice pipe (5) out of the straight hole, fixing the orifice pipe (5) to the straight hole, installing a flange plate cover (6) at the orifice of the orifice pipe (5), sealing a gap between the orifice pipe (5) and the straight hole, and finally starting the slurry pump (9) to perform pressurized grouting to the orifice pipe (5) and the straight hole through a grouting pipe (8);
step two: after mud in the orifice pipe (5) and the straight hole is solidified, opening the flange plate cover (6), drilling a top plate through-layer directional drilling main hole coal-rock layer section (17) towards the direction of a coal seam top plate (16) along the central construction of the orifice pipe (5), turning to be horizontal and flat after penetrating through the coal seam top plate (16), wherein the flat position is located at a stable extraction layer (18), withdrawing a drill rod, tightening the flange plate cover (6), and performing pressurized grouting and sealing on the top plate through-layer directional drilling main hole coal-rock layer section (17) through a grouting pipe (8);
step three: after cement slurry in the main hole coal-rock layer section (17) of the top plate cross layer directional drilling is solidified, drilling the main hole coal-rock layer section (17) of the top plate cross layer directional drilling by using a directional drilling machine, and drilling a main hole (10) of the top plate cross layer directional drilling along the horizontal direction after reaching a stable pumping layer (18);
step four: retreating to construct a roof penetrating directional drilling branch hole (15), withdrawing the drill rod section by section from the roof penetrating directional drilling main hole (10), constructing the roof penetrating directional drilling branch hole (15) towards the coal seam (13) intermittently, and enabling the roof penetrating directional drilling branch hole (15) to penetrate through the coal seam (13) area of the working surface;
step five: after a roof penetrating directional drilling branch hole (15) is constructed, a hydraulic pressurization punching measure is carried out on the roof penetrating directional drilling branch hole (15) during the period of drilling and withdrawing the rod, and after the roof penetrating directional drilling branch hole (15) is punched, the rod is withdrawn to a roof penetrating directional drilling main hole (10);
step six: repeating the fourth step and the fifth step, after the punching work of all the roof penetrating directional drilling branch holes (15) is completed, sealing the holes to the junction of the roof penetrating directional drilling main hole coal rock layer section (17) and the stable extraction layer (18), and then carrying out gas grid-connected continuous extraction work on the roof penetrating directional drilling main hole (10);
step seven: at a drilling site (2) in a coal seam floor (3), constructing a floor penetrating directional drilling main hole (12) in the horizontal direction of the coal seam floor (3), wherein the floor penetrating directional drilling main hole (12) transversely penetrates through the area of the coal seam floor (3) of a working surface, after the floor penetrating directional drilling main hole (12) is constructed in place, withdrawing a directional drilling rod section by section, constructing floor penetrating directional drilling branch holes (14) in the direction of the coal seam (13) intermittently, the floor penetrating directional drilling branch holes (14) penetrate through the area of the coal seam (13) of the working surface, and the floor penetrating directional drilling branch holes (14) and the roof penetrating directional drilling branch holes (15) are inserted into the coal seam (13) in a staggered mode;
step eight: after each floor crossing directional drilling branch hole (14) is constructed, hydraulic pressurization punching measures are carried out on the floor crossing directional drilling branch hole (14) in the period of drilling and withdrawing the rod, after the floor crossing directional drilling branch hole (14) is punched, the rod is withdrawn to a floor crossing directional drilling main hole (12), after the punching work of all floor crossing directional drilling branch holes (14) is completed, hole sealing is carried out, and gas grid-connected continuous pumping work is carried out on the floor crossing directional drilling main hole (12);
step nine: aiming at the coal seam (13) region between a top plate cross-layer directional drilling main hole (10) and a bottom plate cross-layer directional drilling main hole (12) which are respectively arranged on a stable extraction layer (18) and a coal seam bottom plate (3) to form an extraction blank zone, constructing at least one bottom plate cross-layer drilling hole (11), completing hydraulic punching operation after drilling, sealing the hole, and performing gas grid-connected continuous extraction operation on the bottom plate cross-layer drilling hole (11);
step ten: and performing extraction standard-reaching evaluation by using extraction standard-reaching evaluation software in the extraction process, and starting tunneling the coal roadway after the extraction reaches the standard.
2. The directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method according to claim 1, characterized in that: in the first step, a section of straight hole is constructed in the direction of a coal seam roof (16), the aperture diameter of the hole is phi 133mm, the depth is 10m, the diameter of the flange plate cover (6) is phi 127mm, the hole opening section of the hole opening pipe (5) is exposed by 20-30cm, and a gap between the hole opening pipe (5) and the straight hole is anchored and sealed by adopting an anchoring agent; and pressurizing and grouting the orifice pipe (5) and the straight hole until the pressure resistance is more than 5 MPa.
3. The directional long drilling combined bottom plate cross-layer drilling stereoscopic gas extraction method according to claim 1, characterized by comprising the following steps: in the second step, the aperture of the main hole coal-rock layer section (17) of the top plate cross-layer directional drilling is phi 115mm, the grouting pressure for the main hole coal-rock layer section (17) of the top plate cross-layer directional drilling is 10MPa, the vertical distance between the stable pumping layer (18) and the coal bed (13) is kept about 20m, or the mining height is 4-5 times according to the actual mining height and geological conditions of a stope face.
4. The directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method according to claim 1, characterized in that: in the third step, the diameter of the drill hole of the main hole coal rock layer section (17) is phi 96mm through the top plate layer.
5. The directional long drilling combined bottom plate cross-layer drilling three-dimensional gas extraction method according to claim 1, characterized in that: in the fourth step, constructing a top plate layer-penetrating directional drilling branch hole (15) at intervals of 20-30 m; and seventhly, constructing a floor penetrating directional drilling branch hole (14) at intervals of 20-30 m.
6. The directional long drilling combined bottom plate cross-layer drilling stereoscopic gas extraction method according to claim 1, characterized by comprising the following steps: the punching pressure is more than or equal to 10MPa, and the amount of the punching coal is 1.2t/m to 1.5t/m.
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| RU2209305C2 (en) * | 2000-04-13 | 2003-07-27 | Ухтинский государственный технический университет | Method of coals underground gasification and degassing (versions) |
| CN102031950B (en) * | 2010-12-06 | 2012-02-15 | 煤炭科学研究总院西安研究院 | Hole-forming process method for comb gas extraction borehole in coal seam roof |
| CN102392677A (en) * | 2011-10-21 | 2012-03-28 | 河南煤业化工集团研究院有限责任公司 | Permeability improvement technology for coal bed gas reservoir cap by using three-dimensional fracture network modification |
| RU2597040C1 (en) * | 2015-07-28 | 2016-09-10 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Казанский (Приволжский) федеральный университет" (ФГАОУВПО КФУ) | Method for development of hydrocarbon fluid deposits |
| CN111305891B (en) * | 2019-12-03 | 2021-06-25 | 安徽理工大学 | Three-dimensional comprehensive efficient and accurate treatment technical method for coal-oil-gas coexisting mine |
| CN111594258A (en) * | 2020-04-29 | 2020-08-28 | 中煤科工集团西安研究院有限公司 | Technical method for quickly extracting gas to reach standard by using broken soft low-permeability outburst coal seam instead of roadway through holes |
| CN112324337B (en) * | 2020-11-05 | 2023-05-09 | 河南神火煤电股份有限公司 | Whole-course gas extraction method for penetrating layer of soft coal seam bottom plate and along top comb-shaped drilling |
| CN112593998B (en) * | 2020-12-11 | 2023-10-13 | 山西晋煤集团技术研究院有限责任公司 | Progressive gas control method for soft low-permeability outburst coal seam area |
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