CN112901247A - Coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method - Google Patents
Coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method Download PDFInfo
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- CN112901247A CN112901247A CN202110368226.7A CN202110368226A CN112901247A CN 112901247 A CN112901247 A CN 112901247A CN 202110368226 A CN202110368226 A CN 202110368226A CN 112901247 A CN112901247 A CN 112901247A
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- 238000005553 drilling Methods 0.000 title claims abstract description 83
- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 230000002265 prevention Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 abstract description 10
- 239000011435 rock Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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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
- E21B10/00—Drill bits
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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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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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
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
本发明公开的一种煤矿井下多级套管长距离防灭火钻孔施工方法，涉及煤矿井下钻孔施工技术领域。该方法首先在本煤层钻场利用钻机向下邻近煤层采空区火源隐患点方位一开钻孔，打至本煤层底板老底位置，起钻后，下入一级套管；待水泥浆凝固后，换径打二开钻孔至裂隙带，下入二级套管；待水泥浆凝固后后，换径打三开钻孔，直到钻至采空区隐患点冒落带上方位置，下入三级套管作为防灭火措施通道。本发明公开的钻孔施工方法在本煤层破碎煤岩体施工防灭火钻孔以及施工邻近煤层长距离穿层防灭火钻孔时，钻孔成孔率高，方便套管下置到位，适用于长距离防灭火钻孔的施工，防灭火措施实施效果更好。
The invention discloses a construction method for long-distance fire prevention and fire-prevention drilling with multi-stage casings in a coal mine, and relates to the technical field of underground drilling construction in coal mines. In this method, firstly, the drill rig is used in the coal seam drilling site to drill down the position of the hidden fire source in the coal seam goaf, and drill it to the old bottom position of the coal seam floor. After that, change the diameter and drill the second hole to the fissure zone, and run the second-level casing; after the cement slurry solidifies, change the diameter and drill the third hole until it reaches the position above the caving zone of the hidden danger point in the goaf. Enter the tertiary casing as a channel for fire prevention measures. The drilling construction method disclosed by the invention has high drilling porosity when the coal seam crushed coal and rock mass is constructed for fire prevention and fire prevention and long-distance cross-layer fire prevention and fire prevention holes in adjacent coal seams are constructed, the casing is convenient to be placed in place, and is suitable for For the construction of long-distance fire-fighting drilling holes, the implementation of fire-fighting measures is more effective.
Description
Technical Field
The invention relates to the technical field of underground coal mine drilling construction, in particular to a multi-stage sleeve long-distance fire prevention and extinguishing drilling construction method for an underground coal mine.
Background
Mine fires are one of the main disasters in coal mines. In recent years, with the increasing of the mining depth and strength of coal seams, spontaneous combustion of residual coal in a goaf occurs, and a serious challenge is brought to the safe production of coal mines. The technical means of grouting, inert gas injection, three-phase foam injection and the like are widely applied by constructing fire-extinguishing-preventing drill holes on the goaf fire source points, and the method is one of the most economic and effective technical methods for preventing spontaneous combustion of residual coal in the goaf.
At present, the construction methods of fire prevention and extinguishing drilling adopted by mines at home and abroad are mainly divided into two types: 1. the direct drilling rod construction method is that after the drilling machine is used to drill through the drill bit and the drilling rod to reach the predicted final hole position, the casing is set to protect the hole and various fire preventing and extinguishing materials are injected into the high temperature hidden trouble area. 2. The drill rod retaining construction method is that after the drill rod reaches the predicted final position through the drill bit and the drill rod, the drill bit and the drill rod are directly retained in the drill hole without lifting the drill, and measures such as grouting, inert grouting and the like are taken for fire source hidden danger points through the drill rod and the drill bit water outlet hole to prevent and control fire.
However, the above two drilling methods have certain problems and disadvantages when constructing fire-fighting drill holes as grouting channels. The drill rod direct hole construction method is suitable for stabilizing a hard rock coal seam in a coal mine underground, and after the drill is taken out, the stability of the hole wall of a drilled hole is good, and the casing can be timely put into the drilled hole without collapsing. However, in a goaf where spontaneous combustion disasters of coal mines often occur, due to the high destructiveness of the goaf, a caving zone and a fissure zone formed by natural collapse of a top plate and the frequent occurrence of geological conditions such as a structural broken zone and a collapse column, the stability of a hole wall is poor, the phenomenon of hole collapse after drilling often occurs, a sleeve cannot reach a preset position, meanwhile, flushing liquid leakage is caused by broken coal and rock mass, the hole forming rate of a drilled hole is less than 60%, the installation success rate of the sleeve is less than 50%, the front end of a grouting pipe is also easy to block, and the construction efficiency and the grouting effect are greatly influenced. In addition, the construction difficulty of long-distance fire prevention and extinguishing drilling is high for the fire source hidden danger area at the deeper part of the goaf. Although the drill rod indwelling construction method solves the problem of hole collapse caused by lifting drilling under the condition of crushing a coal rock roof to a certain extent, the method is high in cost, the water outlet hole of the drill bit is small and small, large-strength grouting can not be carried out in a short time, and grouting quantity can not meet requirements, so that the fire prevention and extinguishing effect is poor.
Therefore, in view of the above problems, it is necessary to provide a method for drilling a hole under a casing with high hole forming rate and convenience, so as to improve the fire-fighting effect.
Disclosure of Invention
In view of the above, the invention discloses a construction method for a long-distance fire prevention and extinguishing drill hole of a multi-stage casing pipe under a coal mine, which solves the technical problems that when a cross-layer fire prevention and extinguishing drill hole is remotely constructed from a broken coal rock mass to a fire source hidden danger point adjacent to a coal seam goaf under the coal mine, the drilling hole forming rate is low, the casing pipe is difficult to put in place, the construction distance is short, and the effect of the drilling hole is poor when the drilling hole is used for fire prevention and extinguishing measures.
The invention aims to provide a coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method, which comprises the following steps:
the method comprises the following steps: and drilling holes in the coal seam drilling field in the direction of the hidden danger point of the fire source of the downward adjacent layer goaf by using a drilling machine, wherein the drilled holes are drilled to the old bottom position of the bottom plate of the coal seam.
Step two: and after the drill is taken out, a first-stage casing pipe is put in and the pipe is fixed.
Step three: and after the first-stage casing pipe is fixed, replacing the drill bit, drilling a second drilled hole with the diameter smaller than that of the first drilled hole, and drilling the second drilled hole to the microleakage stratum along the center of the orifice pipe.
Step four: and after the drill is pulled out, a secondary casing is put in and the pipe is fixed to protect the wall.
Step five: and after the second-stage casing pipe is fixed, replacing the drill bit again, drilling a three-opening drill hole with the diameter smaller than that of the two-opening drill hole, and drilling the three-opening drill hole to the position above the caving zone of the hidden danger point of the goaf along the center of the orifice pipe.
Step six: and after the drill is taken out, a third-level sleeve is put in and fixed to serve as a fire prevention and extinguishing measure channel.
Preferably, the drilling machine is a model ZLJ4000D drilling machine, and the drilling tool assembly adopts a mode of a phi 63.5mm outer flat drilling rod and a drilling bit.
Preferably, the diameters of the drill bits selected for drilling the first drilled hole, the second drilled hole and the third drilled hole are respectively 133mm, 113mm and 75 mm; the multistage sleeve pipe is seamless steel pipe, and one-level sleeve pipe diameter is 127mm, and second grade sleeve pipe diameter is 89mm, and tertiary sleeve pipe diameter is 50 mm.
Preferably, the multistage sleeve grouting and pipe fixing mode is a pipe fixing process of slurry returning outside the grouting pipe in the pipe.
Preferably, the solid tube slurry dispersoid adopts 32.5-grade ordinary portland cement, and the weight ratio of the ordinary portland cement to the water: ash is 0.5-0.6: 1.
Compared with the prior art, the long-distance fire prevention and extinguishing drilling construction method for the underground multistage sleeve of the coal mine disclosed by the invention has the advantages that:
when this broken coal rock mass of coal seam construction is prevented and is put out a fire drilling and is constructed neighbouring coal seam long distance and cross the layer and prevent and put out a fire drilling, drilling hole-forming rate is high, makes things convenient for the sleeve pipe to put in place down, is applicable to the construction of long distance preventing and putting out a fire drilling, satisfies the large-traffic long-time pouring of various fire prevention and extinguishing materials simultaneously, and the measure implementation effect of preventing putting out a fire is better.
Drawings
For a clearer explanation of the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of the construction method of the present invention.
Fig. 2 is a schematic view of a borehole configuration.
The part names represented by the numbers or letters in the drawings are:
1-drilling field; 2-a drilling machine; 3-coal seam mining face roadway; 4-coal bed; 5-three drilling holes; 6-lower adjacent coal seam goaf caving zone; 7-drilling; 8-the old bottom position of the coal seam floor; 9-the junction; 10-a lower adjacent coal seam goaf fissure zone; 11-a rock formation; 12-drilling a hole; 13-primary sleeve; 14-drilling a hole twice; 15-a secondary sleeve; 16-three stage casing.
Detailed Description
The following provides a brief description of embodiments of the present invention with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any inventive work belong to the protection scope of the present invention.
Fig. 1-2 show a preferred embodiment of the present invention, which is parsed in detail.
The construction method for the multi-stage casing long-distance fire prevention and extinguishing drilling in the underground coal mine is applied to six flat coal mines, a drilling machine 2 is a model ZLJ4000D drilling machine, and a drilling tool combination adopts a mode of a phi 63.5mm outer flat drilling rod and a drilling bit. The method comprises the following steps:
the method comprises the following steps: according to a geological drilling histogram, designing a cross-layer fire prevention and extinguishing drilling angle, predicting the depth of holes and the length of a sleeve at each level, and adjusting the inclination angle of a machine body and the horizontal hole height of a ZLJ4000D type drilling machine to drill a hole 7. In a drill site 1 constructed in a coal seam mining face roadway 3, a drilling machine 2 is utilized to open a hole downwards to the position above a hidden danger point of a fire source 6 of an caving zone of a coal seam goaf, and a hole is drilled at the first time12 aperture
And drilling to the old bottom position 8 of the coal seam floor in the rock stratum 11, wherein the depth of the drilled hole 7 is about 10m, and the specific depth is determined according to actual geological conditions.
Step two: after the drill is taken out, the drill is put in
The first-stage sleeve 13 is fixed to the bottom of the hole by a pipe fixing process of grouting outside the grouting pipe in the pipe.
Step three: after the cement paste is solidified, it is changed
The drill bit of (1) is provided with a second opening drilling hole 14, and the second opening drilling hole 14 is drilled to the microleakage stratum along the center of the orifice pipe. The junction 9 or the actual depth and the layer position of the fracture zone 10 of the adjacent coal seam goaf predicted by the geological drilling histogram and the upper rock stratum 11 of the microleakage stratum are subject to serious mud loss.
Step four: after the drill is taken out, the drill is put in
And (3) protecting the wall of the secondary sleeve 15 with the wall thickness not less than 4.5mm to the bottom of the hole, and fixing the pipe by adopting a pipe fixing process of grouting outside the grouting pipe in the pipe.
Step five: after the cement paste is solidified for 48 hours, the cement paste is replaced again
The drill bit is provided with three openings of drill holes 5, and the three openings of drill holes 5 are drilled to the position above the caving zone 6 of the coal seam goaf below along the center of the orifice pipe.
Step six: after the drill is taken out, the drill is put in
The three-stage sleeve 16 is used as a fire prevention and extinguishing measure channel for large-flow grouting, inert gas injection and the like. The whole hole adopts a composite sheet drilling process.
Furthermore, in the pipe discharging process, the sleeve pipe adopts the national standardThe wall thickness of the seamless steel pipe is not less than 4.5mm, the length of the seamless steel pipe is 2m, and a short root with the length of 0.5m is used as an adjustment. Each sleeve is a double-end female buckle and is connected through a double male short section. The uppermost sleeve opening is welded with a high-pressure flange. Before pipe laying, a sleeve pipe with the length of 4.5m is connected with the bottom of the hole along the inside of the hole by the sleeve pipe, if the pipe laying is not smooth, the sleeve pipe is put forward to sweep the hole and continue the operation until the pipe laying is smooth, and then formal pipe laying operation can be carried out. When the pipe is lowered, the sleeve in the hole is fixed on the hole opening by using a chain type slip or a sleeve clamp fixing seat, the upper part of the sleeve is connected with a sleeve, the uppermost sleeve is connected with a lifting head through a screw thread, after the lifting head is lifted by using a drilling machine 2 with a winch, the chain type slip is dismounted or the sleeve clamp is loosened, the winch is operated, and the sleeve is slowly lowered into the hole by the dead weight of the sleeve. So as to reciprocate. When the sleeve is connected, the screw thread is wound with a hemp thread, and the large tooth tongs or the chain whip are tightened. After the second-stage casing 15 is put in, the casing is lifted away from the bottom of the hole by 0.2m, a grouting closing disc is arranged at the top end of the orifice casing, cement slurry is injected into the casing from the casing opening through a high-pressure pipe by a slurry pump, the condition of slurry return in a gap between the casing and the hole wall is observed at the same time, and after the cement returns out of the ground, the grouting is stopped, and the casing is dropped. After the slurry is poured and the coagulation is waited for 48 hours, the mortar is used
And (3) sweeping the hole by the drill bit to a position 1-2m close to the bottom of the hole, if cement is not well solidified, continuing to wait for solidification, if the cement is solidified, supporting the drilling tool, sweeping the hole to the bottom of the hole, and slowly recovering the drilling of the three-opening drilling hole 5.
Furthermore, in the process of slow drilling of the drilling machine 2, bentonite slurry is used as a flushing medium for the first drilling hole 12 and the second drilling hole 14, the slurry circulation is used for the third drilling hole 5, and clear water top leakage drilling is used after the slurry is completely leaked.
Furthermore, the solid pipe slurry dispersoid adopts 32.5-grade ordinary portland cement, and the weight ratio of the dispersoid to the water: ash is 0.5-0.6:1, the cement is required not to be overdue, not to be affected with damp and agglomerated, and the cement is made into pulp by clean water.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method is characterized by comprising the following steps:
the method comprises the following steps: in a drilling field (1) of the coal seam (4), a drilling machine (2) is utilized to drill a hole (12) in the position of a hidden danger point of a fire source of a goaf of a lower adjacent layer, and the hole (12) is drilled to an old bottom position (8) of a bottom plate of the coal seam;
step two: after the drill is taken out, a first-level sleeve (13) is put in and the pipe is fixed;
step three: after the first-stage casing (13) is fixed, the drill bit is replaced, a second drilled hole (14) with the hole diameter smaller than that of the first drilled hole (12) is drilled, and the second drilled hole (14) is drilled to a micro-leakage stratum along the center of the orifice pipe;
step four: after the drill is taken out, a secondary casing (15) is put in and fixed to protect the wall;
step five: after the second-stage casing (15) is fixed, the drill bit is replaced again, the three-opening drill hole (5) with the opening diameter smaller than that of the two-opening drill hole (14) is drilled, and the three-opening drill hole (5) is drilled to the position above the caving zone of the hidden danger point of the goaf along the center of the orifice pipe;
step six: after the drill is taken out, a third-level sleeve (16) is put in and fixed to serve as a fire prevention and extinguishing measure channel.
2. The construction method of the multi-stage casing long-distance fire prevention and extinguishing drill hole in the coal mine well according to the claim 1, characterized in that the drilling machine (2) is a model ZLJ4000D drilling machine, and the drilling tool combination adopts a mode of a phi 63.5mm outer flat drilling rod and a drill bit.
3. The coal mine underground multistage casing long-distance fire prevention and extinguishing drilling construction method according to claim 1, characterized in that the drill bit diameters selected for drilling the first drilled hole (12), the second drilled hole (14) and the third drilled hole (5) are 133mm, 113mm and 75mm respectively; the multistage sleeve pipe is seamless steel pipe, and the diameter of one-level sleeve pipe (13) is 127mm, and the diameter of second grade sleeve pipe (15) is 89mm, and the diameter of third grade sleeve pipe (16) is 50 mm.
4. The coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method according to claim 3, wherein the multistage sleeve grouting and pipe fixing modes are pipe fixing processes of grouting inside a pipe and returning slurry outside the pipe.
5. The coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method according to claim 4, characterized in that a solid pipe slurry dispersoid is 32.5-grade ordinary portland cement, and the weight ratio of the solid pipe slurry dispersoid to water: ash is 0.5-0.6: 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110368226.7A CN112901247A (en) | 2021-04-06 | 2021-04-06 | Coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method |
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| CN112682098A (en) * | 2020-12-28 | 2021-04-20 | 冀中能源股份有限公司邢东矿 | Large vertical-depth large-aperture coal gangue feeding hole and construction method thereof |
| CN113846977A (en) * | 2021-09-09 | 2021-12-28 | 山西机械化建设集团有限公司 | Dry pore-forming method for backfilled coal gangue stratum with clay interlayer |
| CN115263180A (en) * | 2022-07-20 | 2022-11-01 | 肥城新查庄地质勘查有限公司 | Coal mine drilling method for water-sensitive rock stratum, structural broken zone and pressure concentration area |
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Application publication date: 20210604 |