CN111140167A - Straight-through water drainage drilling construction method for coal seam mining under conglomerate aquifer - Google Patents
Straight-through water drainage drilling construction method for coal seam mining under conglomerate aquifer Download PDFInfo
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- CN111140167A CN111140167A CN201911272360.6A CN201911272360A CN111140167A CN 111140167 A CN111140167 A CN 111140167A CN 201911272360 A CN201911272360 A CN 201911272360A CN 111140167 A CN111140167 A CN 111140167A
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- sleeve
- hole
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- water
- glutenite
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
Abstract
The invention relates to a straight-through water drainage drilling construction method for mining a coal bed below a water-bearing stratum of glutenite, wherein a first-stage drilling hole is drilled to the top interface of the water-bearing stratum of weakly cemented glutenite, a sleeve is installed, and grouting reinforcement is carried out; drilling a second-stage drilling hole to the bottom interface of the water-bearing layer of the weakly cemented glutenite, and mounting a sieve pipe; drilling a third-stage drilling hole until the third-stage drilling hole is communicated with a roadway top plate formed by an underground coal seam to be mined, installing a sleeve and grouting for reinforcement; the lower casing mouth of the drill hole is connected with a valve through a screw thread to control water drainage. The invention has the beneficial effects that: the traditional construction method of the underground drainage water hole is changed, the direct drainage hole is constructed on the ground and communicated with the underground roadway roof, and water in the roof aquifer is drained through the whole weakly cemented glutenite aquifer, so that the drainage effect is improved, the water inrush risk of the roof aquifer is reduced, and the method can be widely applied to the technical field of coal mining and disaster prevention.
Description
Technical Field
The invention relates to the technical field of coal mining and disaster prevention, in particular to a through water drainage drilling construction method for coal mining under a glutenite aquifer.
Background
The coal-bearing stratum of the Yili mining area in Xinjiang is a Jurassic system stratum, the coal seam has the characteristics of typical shallow buried depth, thin bedrock and thick coal seam, and a weakly cemented conglomerate water-bearing stratum is generally developed on the top plate and is a main water disaster factor for coal seam mining. Water in the weakly cemented glutenite aquifer is drained by adopting the water drainage drill hole of the underground construction top plate in the earlier stage, the problems of difficulty in drilling, low construction efficiency, serious drilling hole shrinkage and incapability of installing a sleeve in place in the construction process exist, drilling cannot be carried out when the drill hole enters the weakly cemented glutenite aquifer for 2-5 meters, drilling accidents occur frequently, the drill hole cannot penetrate through the whole aquifer, the maximum water inflow amount of a single hole is only 1m3And the water drainage effect is poor, so that the water hazard of the weakly cemented glutenite aquifer on the coal seam roof of the mine seriously endangers the safe production of the mine, and the mine cannot normally produce.
The development and the start of the Yili mining area in Xinjiang are late, the hydrogeological conditions of the mining area are special, the referential water damage prevention and control experience is unavailable, and the water damage of the aquifer of the weakly cemented glutenite on the top plate is the greatest potential safety hazard of the safe production of the mine. If the threat of water damage of a roof aquifer cannot be solved, a large underground mine built in an Ili mine area is difficult to survive, so that a huge investment is caused; and meanwhile, the waste of billions of coal resource reserves in the Ili mine area is caused.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a through water drainage drilling construction method for coal seam mining under a glutenite aquifer comprises the following steps:
(1) drilling to a water-bearing stratum top interface of the weakly cemented glutenite from a ground open hole by using a first drill bit, then reaming by using a first reaming drill bit to obtain a first-stage drilled hole, and cleaning the first-stage drilled hole after reaming is finished;
(2) installing a first sleeve into the first-stage drill hole to the bottom of the first-stage drill hole, wherein the first sleeve is 200mm higher than the ground orifice, and performing wall back grouting on the first sleeve by using the stirred cement slurry through a grouting pump;
(3) after the cement slurry is solidified, drilling from the inside of the first-stage casing pipe to the bottom interface of the water-bearing layer of the weakly cemented glutenite by using a first drill bit to obtain a second-stage drilled hole, and cleaning the second-stage drilled hole;
(4) installing a sieve tube into the second-stage drill hole to the bottom of the second-stage drill hole, wherein the lower end of the sieve tube is a contracted horn mouth;
(5) drilling from the sieve tube to be communicated with the top plate of the underground roadway by using a second drill bit to obtain a third-stage drilled hole;
(6) installing a second sleeve in the third-stage drill hole, wherein the upper end of the second sleeve is an outward-expanding bell mouth and is matched and connected with the bell mouth at the lower end of the sieve tube, and the expansion rubber is filled between the second sleeve and the sieve tube for stopping water, the lower end of the second sleeve is a spiral screw thread, the second sleeve extends out of the position below the top plate of the roadway by 200mm, and grouting the second sleeve with the stirred cement slurry from the underground by using a grouting pump;
(7) after the cement slurry is solidified, a valve is installed at the lower end of the second sleeve through a spiral screw thread to control water drainage.
Further, the first drill bit in the step (1) is
The composite bit, the first expanding bit is
And (5) reaming the drill bit.
Further, the stepsThe diameter of the first sleeve in the step (2) is
And the wall post-grouting is to insert a grouting tubule between the outer wall of the first sleeve and the wall of the first-stage drilled hole, and a grouting pump is connected to pump cement slurry into a gap between the outer wall of the sleeve and the wall of the drilled hole to reinforce the first sleeve.
Further, the diameter of the sieve tube in the step (4) is
The screen pipe wall is provided with a strip-shaped hole, and the minimum diameter of a horn mouth of the lower end head of the screen pipe in a contraction shape is 100 mm.
Further, the second drill bit in the step (5) is
A composite bit.
Further, the diameter of the second sleeve in the step (6) is
The maximum diameter of a flared bell mouth of the outward-expanding shape of the upper end head of the second sleeve is 105mm, grouting is performed after the wall is built, a grouting thin pipe is inserted between the outer wall of the second sleeve and the wall of a third-stage drilled hole, a gap between the outer wall of the sleeve at the lower hole opening of the drilled hole and the wall of the drilled hole is sealed by jute for 100mm to prevent slurry leakage, and a grouting pump is connected to pump cement slurry into the second sleeve for reinforcing the second sleeve.
After adopting the structure, the invention has the following advantages:
the through water drainage drilling construction method for mining the coal bed below the aquifer of the weakly cemented gravel rock overturns the traditional construction method of the water drainage drilling of the aquifer of the roof from the underground, the invention drills through the ground opening and the roof of the underground roadway, and drains the water in the aquifer through the whole aquifer of the weakly cemented gravel rock, thereby overcoming the defects of high construction difficulty, low construction efficiency, serious aperture shrinkage, difficult sleeve installation, frequent drilling jamming in the construction process, low pore-forming rate, small water quantity of drilled holes, easy hole blocking in the water drainage process and poor water drainage effect in the prior underground water drainage drilling construction;
by adopting the construction method for the straight-through water drainage drilling hole, the water drainage amount of a single hole is obviously increased, the drainage effect on the water-bearing stratum of the top plate weakly cemented glutenite is obvious, and the water-proof safety of the water-bearing stratum of the top plate weakly cemented glutenite in the coal seam mining process is ensured.
Drawings
FIG. 1 is a schematic illustration of a through water drainage drilling method for mining a coal seam below a conglomerate aquifer;
fig. 2 is an enlarged view at a in fig. 1.
As shown in the figure: 1-ground; 2-weakly cemented glutenite water-bearing stratum top interface; 3-first-stage drilling; 4-a first sleeve; 5-cement slurry; 6-secondary drilling; 7-weakly cemented conglomerate water-bearing formation bottom interface; 8-sieve tube; 9-bell mouth at the lower end of the sieve tube; 10-bell mouth at the upper end of the second sleeve; 11-an expanded rubber; 12-underworkings roof; 13-third stage drilling; 14-a second sleeve; 15-spiral screw thread; 16-a valve; 17-weakly cemented conglomerate aquifer; 18-water barrier layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
With reference to the accompanying drawings 1-2, the embodiment discloses a construction method for mining a coal seam under a weakly cemented glutenite aquifer 17, specifically a straight-through drilling drainage mode, which comprises the following steps:
(1) first use
The first drill bit drills into the top interface 2 of the water-bearing stratum of the weakly cemented glutenite from the ground opening hole, and then the second drill bit adopts
The first hole expanding drill bit is used for expanding holes to obtain
The first-stage drilling 3 is carried out, the depth of the first-stage drilling is 40m, and the first-stage drilling 3 is cleaned after hole expansion is finished;
(2) is arranged in the first-stage drill holeClothes (CN)
The first sleeve 4 is arranged at the bottom of the first-stage drill hole, the first sleeve is 200mm higher than the ground hole, a grouting thin pipe is inserted between the outer wall of the first sleeve and the wall of the first-stage drill hole 3, and a grouting pump is connected to pump cement slurry 5 into a gap between the outer wall of the sleeve and the wall of the drill hole to reinforce the first sleeve 4;
(3) after the cement paste is solidified for 24 hours, the cement paste is used
The first drill bit drills into the water-bearing stratum bottom interface 7 of the weakly cemented glutenite from the first-stage casing pipe to obtain
A second-stage drilling hole 6 with the depth of 90m is cleaned;
(4) into the second stage borehole 6
The sieve tube 8 is arranged at the bottom of the second-stage drilling hole 6, the sieve tube wall is a strip-shaped hole, the lower end of the sieve tube 8 is a contracted bell mouth, the length of the bell mouth is 300mm, and the minimum diameter is 100 mm;
(5) use of
The second drill bit is drilled from the sieve tube to be communicated with the top plate 12 of the underground roadway to obtain
A third-stage drilling hole 13, wherein the depth of the third-stage drilling hole 13 is 15 m;
(6) into the third stage borehole 13
A second sleeve 14, wherein the upper end of the second sleeve 14 is an outward-expanding bell mouth, the length of the bell mouth 10 at the upper end of the second sleeve 14 is 300mm, the maximum diameter is 105mm, and the second sleeve is matched and connected with the bell mouth 9 at the lower end of the sieve tubeAnd then, filling expansion rubber 11 between the two pipes for water stop, wherein the lower end of the second casing pipe 14 is a spiral screw thread 15 with the length of 100mm, the second casing pipe 14 extends out of the position below the top plate of the roadway by 200mm, a thin pipe is inserted between the outer wall of the second casing pipe 14 and the hole wall of the third-stage drill hole 13, a gap between the outer wall of the casing pipe at the lower orifice of the drill hole and the hole wall of the drill hole is sealed by jute for 100mm to prevent slurry leakage, and a grouting pump is connected to pump cement slurry 5 into the second casing pipe 14 for reinforcement.
(7) After cement slurry is solidified for 24 hours, a valve 16 is arranged at the lower end of the second casing 14 through a screw thread 15 for controlling water discharge, and the water discharge amount of a single hole is 36m3/h。
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A through water drainage drilling construction method for coal seam mining under a glutenite aquifer is characterized by comprising the following steps:
(1) drilling to a water-bearing stratum top interface of the weakly cemented glutenite from a ground open hole by using a first drill bit, then reaming by using a first reaming drill bit to obtain a first-stage drilled hole, and cleaning the first-stage drilled hole after reaming is finished;
(2) installing a first sleeve into the first-stage drill hole to the bottom of the first-stage drill hole, wherein the first sleeve is 200mm higher than the ground orifice, and performing wall back grouting on the first sleeve by using the stirred cement slurry through a grouting pump;
(3) after the cement slurry is solidified, drilling from the inside of the first-stage casing pipe to the bottom interface of the water-bearing layer of the weakly cemented glutenite by using a first drill bit to obtain a second-stage drilled hole, and cleaning the second-stage drilled hole;
(4) installing a sieve tube into the second-stage drill hole to the bottom of the second-stage drill hole, wherein the lower end of the sieve tube is a contracted horn mouth;
(5) drilling from the sieve tube to be communicated with the top plate of the underground roadway by using a second drill bit to obtain a third-stage drilled hole;
(6) installing a second sleeve in the third-stage drill hole, wherein the upper end of the second sleeve is an outward-expanding bell mouth and is matched and connected with the bell mouth at the lower end of the sieve tube, and the expansion rubber is filled between the second sleeve and the sieve tube for stopping water, the lower end of the second sleeve is a spiral screw thread, the second sleeve extends out of the position below the top plate of the roadway by 200mm, and grouting the second sleeve with the stirred cement slurry from the underground by using a grouting pump;
(7) after the cement slurry is solidified, a valve is installed at the lower end of the second sleeve through a spiral screw thread to control water drainage.
2. The method for through-flow water drainage drilling construction for mining coal seams under glutenite aquifers according to claim 1, wherein the first drill bit in the step (1) is
The composite bit, the first expanding bit is
And (5) reaming the drill bit.
3. The method for through-flow drainage borehole construction for mining of coal seam below glutenite aquifer according to claim 1, wherein the first casing diameter in the step (2) is equal to
And the wall post-grouting is to insert a grouting tubule between the outer wall of the first sleeve and the wall of the first-stage drilled hole, and a grouting pump is connected to pump cement slurry into a gap between the outer wall of the sleeve and the wall of the drilled hole to reinforce the first sleeve.
4. The method for through water drainage drilling construction for mining of coal seam under glutenite aquifer according to claim 1, wherein the diameter of the screen pipe in the step (4) is equal to
The screen pipe wall is provided with a strip-shaped hole, and the lower end head of the screen pipe is contracted to form a horn mouth with the smallest straight shapeThe diameter is 100 mm.
5. The method for through-flow drainage drilling construction for mining of coal seam under glutenite aquifer according to claim 1, wherein the second drill bit in the step (5) is
A composite bit.
6. The method for through-flow drainage borehole construction for mining of coal seam below glutenite aquifer according to claim 1, wherein the diameter of the second casing pipe in the step (6) is set to be
The maximum diameter of a flared bell mouth of the outward-expanding shape of the upper end head of the second sleeve is 105mm, grouting is performed after the wall is built, a grouting thin pipe is inserted between the outer wall of the second sleeve and the wall of a third-stage drilled hole, a gap between the outer wall of the sleeve at the lower hole opening of the drilled hole and the wall of the drilled hole is sealed by jute for 100mm to prevent slurry leakage, and a grouting pump is connected to pump cement slurry into the second sleeve for reinforcing the second sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911272360.6A CN111140167A (en) | 2019-12-12 | 2019-12-12 | Straight-through water drainage drilling construction method for coal seam mining under conglomerate aquifer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911272360.6A CN111140167A (en) | 2019-12-12 | 2019-12-12 | Straight-through water drainage drilling construction method for coal seam mining under conglomerate aquifer |
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| CN201911272360.6A Pending CN111140167A (en) | 2019-12-12 | 2019-12-12 | Straight-through water drainage drilling construction method for coal seam mining under conglomerate aquifer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111677513A (en) * | 2020-06-22 | 2020-09-18 | 安徽理工大学 | Water burst sand bursting disturbance deep unconsolidated formation ground grouting pore-forming method |
| CN111827871A (en) * | 2020-06-11 | 2020-10-27 | 冀中能源峰峰集团有限公司 | Underground coal mine hydrological drilling construction system and construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827871A (en) * | 2020-06-11 | 2020-10-27 | 冀中能源峰峰集团有限公司 | Underground coal mine hydrological drilling construction system and construction method |
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| CN111677513B (en) * | 2020-06-22 | 2021-06-29 | 安徽理工大学 | Water burst sand bursting disturbance deep unconsolidated formation ground grouting pore-forming method |
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Application publication date: 20200512 |
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