CN106761674A - It is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground - Google Patents
It is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground Download PDFInfo
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- CN106761674A CN106761674A CN201611129434.7A CN201611129434A CN106761674A CN 106761674 A CN106761674 A CN 106761674A CN 201611129434 A CN201611129434 A CN 201611129434A CN 106761674 A CN106761674 A CN 106761674A
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- water
- unrestrained
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- test
- drilling
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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
- E21B47/00—Survey of boreholes or wells
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
- E21B47/047—Liquid level
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
Abstract
The present invention disclose it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground, including bailing test device, unrestrained water test device, the drilling by the straight-through underground in ground and floor synthetic reception device, anti- silk sealing sleeve pipe a, taper water-stop, drainage floral tube, sand setting pipe and anti-silk sealing sleeve pipe b in fact have been sequentially arranged by ground to underground in drilling, drainage floral tube is located at water-bearing layer, and sand casing is disposed with sand setting reality pipe；Water-level and water-temperature sensor is installed in drilling；Unrestrained water test device include five step by step reducing be arranged in ring flange and magnetic vortex flow sensor in underworkings, gate valve is installed between foot of hole and unrestrained water test device.The need for the present invention has taken into full account bailing test or unrestrained water test, a hole is dual-purpose, overcomes underground to be typically inconvenient to the shortcoming constructed, and realize the quantized datas such as the water level and water temperature in ground real-time automatic monitoring target water-bearing layer.
Description
Technical field
The present invention relates to it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground, belong to and take out
Water, unrestrained water test technical field.
Background technology
At present, carry out bailing test to a certain water-bearing layer and unrestrained water test generally take each independent mode to carry out,
General drilling by ground construction carries out bailing test, and unrestrained water test is carried out by the unrestrained water drilling hole of underground construction.Therefore
Two drillings of construction are needed, and the construction and monitoring in the unrestrained water drilling hole in underground are limited more by tunnel condition, are difficult gathered data.
The content of the invention
For the problem of above-mentioned prior art presence, present invention offer is a kind of to integrate the ground drawn water with unrestrained water test
The straight-through down-hole drilling device in face, is capable of achieving to draw water and unrestrained water test, while water level, the water temperature in energy real-time monitoring water-bearing layer etc.
State, solves to draw water, complex process cumbersome with link caused by the independent construction drill of unrestrained water test at present, be difficult to control and
Cannot be used for the problem of the far distance automatic monitoring in ground.
To achieve these goals, the present invention use it is a kind of integrate draw water and unrestrained water test the straight-through well in ground
Lower drilling equipment, including for carrying out the bailing test device of bailing test and in underworkings for carrying out unrestrained water
The unrestrained water test device of experiment, also including the drilling by the straight-through underground in ground and the ground for the aqueous layer state of real-time monitoring
Anti- silk sealing sleeve pipe a, taper water-stop, drainage have been sequentially arranged by ground to underground in face integrated reception apparatus, the drilling
Floral tube, sand setting are managed and anti-silk sealing sleeve pipe b in fact, and drainage floral tube is located at water-bearing layer, and sand casing is disposed with sand setting reality pipe；It is described
Pipe and anti-silk sealing sleeve pipe b are managed admittedly entirely by cement mortar in fact for anti-silk sealing sleeve pipe a, taper water-stop, sand setting；Installed in drilling
There is water-level and water-temperature sensor；The unrestrained water test device includes the ring flange and mounting flange that five diameters differ
Blow-off line, reducing is arranged in underworkings step by step for five ring flanges, respectively first flange disk, second flange disk,
Three ring flanges, the 4th ring flange and the 5th ring flange, the blow-off line between first flange disk and second flange disk are T-shaped pipe
Road, is provided with the sand net for filtering sand grains in T-shaped pipeline, the bottom of T-shaped pipeline is provided with lets out sand valve；3rd ring flange and
Magnetic vortex flow sensor for detecting unrestrained water-carrying capacity is installed on the blow-off line between four ring flanges；Foot of hole leads to
Cross drainage pipeline to be connected with unrestrained water test device, gate valve is installed on drainage pipeline；Water-level and water-temperature sensor, magnetic Vortex flow
The data that sensor will be detected send floor synthetic reception device to；By drilling, using gate valve, examination of drawing water can be at any time carried out
Test or unrestrained water test, and water level and water temperature data real-time reception are carried out in ground, so that accurate quantification judges that is monitored contains
Water layer hydrogeological parameter.
Iron wire is welded with the outside of the drainage floral tube, iron wire has been tied up in three layers of nylon wire of outsourcing, the outside segmentation of nylon wire.
The floor synthetic reception device includes monitoring system master station, data backup memory server and ground telemetering system
System substation, surface telemetry system substation receives water-level and water-temperature sensor, the water-level and water-temperature that magnetic vortex flow sensor is detected, dredges
Flow discharges signal, and data backup memory server is backed up to, while sending to monitoring system master station, realize to containing
The data sampling and processing and query function of water layer hydrogeological parameter.
The concrete structure of the drilling is：
(1) 0-124.94m apertures Ф 270mm, under enter the anti-silk sealing sleeve pipe a and Ф 240mm taper sealings of 194 × 8mm of Ф
Device, and managed admittedly entirely with cement mortar；
(2) 124.94-154.20m apertures Ф 250mm, wherein, 194 × 6mm of Ф drainages flower is entered under 127.94-154.20m
Pipe, the road of pipe outside weld 8# iron wires 8, three layers of 120 mesh nylon wire of outsourcing, the 16# iron wires segmentation of external application spacing 0.15m is tied up；156.00-
Enter 146 × 8mm of Ф sand settings pipe and Ф 127 × 4mm sand casings in fact under 158.00m, and managed admittedly entirely with cement mortar；
(3) 158.00-225.00m apertures Ф 113mm, under enter the anti-silk sealing sleeve pipe b of 89 × 4.5mm of Ф, and use cement mortar
Complete solid pipe.
Compared with prior art, the present invention, with reference to surface-underground contrast plan, is applied by by the characteristics of ground is easily constructed
Work integrate draws water and unrestrained water test the straight-through down-hole drilling device in ground, can descend over the ground certain depth it is pre- detect it is aqueous
Layer property is monitored in real time.Down-hole drilling is led directly to by ground construction, using the gate valve installed in advance in tunnel, can be at any time
Bailing test or unrestrained water test are carried out, and water level and water temperature data real-time reception are carried out in ground, so that accurate quantification judges
The water-bearing layer hydrogeological parameter monitored.The device is particularly adapted to underworkings and is not suitable for unrestrained water drilling hole of constructing, then
The situation of construction is easy on ground according to the upper and lower control site figure of well.Finally, realize and draw water while with unrestrained water test, can
The states such as water level, the water temperature in real-time monitoring water-bearing layer, solve to draw water at present and cause with the independent construction drill of unrestrained water test
Link it is cumbersome, complex process, problem that is whard to control and cannot be used for the far distance automatic monitoring in ground.Generally speaking, this hair
It is bright to have the following advantages that：
(1) ground convenient construction, integrates three parts, and drawing water to be interacted as needed with unrestrained water is carried out；
(2) can Real-time Collection and analyze data automatically, calculate data and be easy to get reliability；
(3) probing expense is saved, unrestrained amount is adjusted as needed, and can long-term use.
Brief description of the drawings
Fig. 1 is integration unit schematic diagram of the invention；
Fig. 2 is bailing test illustraton of model of the present invention；
Fig. 3 is the schematic diagram of unrestrained water test device of the invention.
In figure：1st, floor synthetic reception device, 2, drilling, 3, water-level and water-temperature sensor, 4, upper flange plate, 5, gate valve, 6,
Lower flange, 7, unrestrained water test device, 8, anti-silk sealing sleeve pipe a, 9, taper water-stop, 10, drainage floral tube, 11, sand setting reality
Pipe, 12, sand casing, 13, anti-silk sealing sleeve pipe b, 14, first flange disk, 15, let out sand valve, 16, sand net, 17, second flange
Disk, the 18, the 3rd ring flange, 19, magnetic vortex flow sensor, the 20, the 4th ring flange, the 21, the 5th ring flange, 22, blow-off line
Outlet, 23, flow automatic recording instrument.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground, use
In carry out bailing test bailing test device, in underworkings be used for carry out unrestrained water test unrestrained water test dress
Put the 7, drilling 2 by the straight-through underground in ground and the floor synthetic reception device 1 for the aqueous layer state of real-time monitoring, the brill
Anti- silk sealing sleeve pipe a8, taper water-stop 9, drainage floral tube 10, sand setting reality pipe 11 and have been sequentially arranged by ground to underground in hole 2
Anti- silk sealing sleeve pipe b13, drainage floral tube 10 is located at water-bearing layer, and sand casing 12 is disposed with sand setting reality pipe 11；The anti-silk stops
Jacket pipe a8, taper water-stop 9, sand setting reality pipe 11 and anti-silk sealing sleeve pipe b13 are managed admittedly entirely by cement mortar；Peace in drilling 2
Equipped with water-level and water-temperature sensor 3；Ring flange and connection method that five diameters that the unrestrained water test device 7 include differ
The blow-off line of blue disk, reducing is arranged in underworkings step by step for five ring flanges, respectively first flange disk 14, second flange
Disk 17, the 3rd ring flange 18, the 4th ring flange 20 and the 5th ring flange 21, between first flange disk 12 and second flange disk 17
Blow-off line is T-shaped pipeline, and the sand net 15 for filtering sand grains is provided with T-shaped pipeline, and the bottom of T-shaped pipeline is provided with lets out sand
Valve 16；Magnetic rotation for detecting unrestrained water-carrying capacity is installed on the blow-off line between the 3rd ring flange 18 and the 4th ring flange 20
Vortex quantity sensor 19；2 bottoms that drill are connected by drainage pipeline with unrestrained water test device 7, and lock is provided with drainage pipeline
Valve 5；The data that water-level and water-temperature sensor 3, magnetic vortex flow sensor 19 will be detected send floor synthetic reception device 1 to；
By drilling 2, using gate valve 5, bailing test or unrestrained water test can be at any time carried out, and water level and water temperature data are carried out in ground
Real-time reception, so that accurate quantification judges monitored water-bearing layer hydrogeological parameter.Wherein, bailing test device is except boring
Equipment necessary to bailing test, such as suction pump, weir notch are carried out outside hole.
The outside of the drainage floral tube 10 is welded with iron wire, and iron has been tied up in three layers of nylon wire of outsourcing, the outside segmentation of nylon wire
Silk, can further prevent the sand grains in water-bearing layer from entering drainage floral tube, be lowered into the sand content of water in drainage floral tube.
The floor synthetic reception device 1 includes monitoring system master station, data backup memory server and ground telemetering
System substation, surface telemetry system substation receive the water-level and water-temperature that water-level and water-temperature sensor, magnetic vortex flow sensor detect,
Unrestrained water flow signal, and data backup memory server is backed up to, while sending to monitoring system master station, it is right to realize
The data sampling and processing and query function of water-bearing layer hydrogeological parameter.
Embodiment：
Carried out with reference to North China type coalfield Yanzhou Mining Group ore deposit giant thick loose strata bottom aquifer (bottom contains) example that succeeded
Illustrate, first, as shown in Fig. 2 the 4th is that structure of the bottom containing bailing test drilling is as follows：
(1) 0-124.94m apertures Ф 270mm, under enter the anti-silk sealing sleeve pipe a and Ф 240mm taper sealings of 194 × 8mm of Ф
Device, and managed admittedly entirely with cement mortar；
(2) 124.94-154.20m apertures Ф 250mm, wherein, 194 × 6mm of Ф drainages flower is entered under 127.94-154.20m
Pipe, the road of pipe outside weld 8# iron wires 8, three layers of 120 mesh nylon wire of outsourcing, the 16# iron wires segmentation of external application spacing 0.15m is tied up；156.00-
Enter 146 × 8mm of Ф sand settings pipe and Ф 127 × 4mm sand casings in fact under 158.00m, and managed admittedly entirely with cement mortar；
(3) 158.00-225.00m apertures Ф 113mm, under enter the anti-silk sealing sleeve pipe b of 89 × 4.5mm of Ф, and use cement mortar
Complete solid pipe.
Secondly, the construction method of the drilling and order are as follows：
(1) perforate is crept into 70.00m from Ф 146mm drill bit centreless, is used Ф 94mm drill bit core drills instead and is proceeded to
180.73m, and carry out digital logging.
(2) after digital logging, from Ф 270mm reaming bit reamings to 124.94m, the reaming of Ф 250mm drill bits is used instead extremely
158.00m.Under enter Ф 146mm sleeve pipes, Ф 194mm sleeve pipes, Ф 194mm floral tubes and Ф 240mm tapers water-stops and carry out sealing, adopt
Managed admittedly with block slip casting method, Gu effective cement 4900kg, clear water 2940kg.The cement solidifies laggard whereabouts water inspection.
(3) sealing inspection uses pressure application, i.e., water is filled in sleeve pipe, water level Continuous Observation 3 hours in sighting tube, per small
When pipe in water level rise or fall less than 2cm, that is, it is qualified to think；
(4) after sealing passed examination, opening and closing water pond is thrown, 215.02m is proceeded to using Ф 94mm core drills, use Ф 113mm instead
Centreless is crept into 224.40m, carries out digital logging.
(5) Ф 89mm sleeve pipes are entered under after logging well, Gu effective cement 500kg and clear water 300kg.
(6) after theing cement solidifies, lower drilling hole 224.35m is made into mud ball plugging hole using yellow mud cement, is depressed into using drilling tool
152.00m。
(7) pumping and washing process such as drawn water using drilling rod gunite, chemical analysis infusion method, pail water lift, piston and deep well pump
With reference to carrying out well-flushing.
(8) after bailing test terminates, repetition measurement coordinate, engineering terminates.
Finally, bailing test is carried out：According to demand, this hole is that the following group layer of sand carries out bailing test to the 4th.
(1) water-bearing layer
This Duan Wei tetra- that draws water is the following group sand section, and buried depth is 139.15~154.20m, thickness 15.05m, and lithology is
Fine sand, clayey fine sand, clayey silt composition.Its medium-fine sand thickness 10.65m, clayey fine sand thickness 3.42m, clayey silt
Thick 0.98m.Wherein water-bearing layer total thickness is 15.05m.
(2) well-flushing, examination take out and static level observation
After sealing passed examination, gunite, pail water pumping method and deep well pump water law are first carried out to the hole with flower drilling rod
Common well-flushing is net to water sand removal；Specific capacity q about 0.048L/ (s.m) is taken a sample test to obtain in examination.
(3) formally draw water
This draw water using equipment have triangular-notch weir, electric fluviograph, steel tape, thermometer, water sample bucket etc..Carry out altogether
Bailing test for drawdown.The bailing test time be on 2 15th, 2,016 12 when 2016 2 months 17 days 18, altogether
Carry out 54 hours, the stable level time is 8 hours, first time dynamic water level 139.47m, drawdown 5.15m；Second dynamic water level
144.67m, drawdown 10.35m；Third time dynamic water level 149.79m, drawdown 15.47m.The water of measurement in every 2 hours in pump process
Temperature, measures 27 DEG C of water temperature average out to, and change is little.Drawing water carries out the observation of recovery water levelx after terminating, water level recover to
134.31m, absolute altitude is -91.91m.After recovery water levelx observation terminates, inspecting hole depth is 151.89m.
Manipulation gate valve, reducing is carried out five ring flanges that can be differed by diameter in the suitable tunnel in underground step by step
Unrestrained water test.In view of be the unrestrained 4th be loose aquifer water, the water-bearing layer has the loose sand to be mixed with water,
Therefore a sand net is being started setting up, bottom is installed one and lets out sand valve, can periodically open the fine sand for letting out sand valve cleaning precipitation, specific knot
Structure is as shown in Figure 3.The flow of unrestrained water can after magnetic vortex flow sensor is transferred to downhole flow automatic recording instrument 23 from
Dynamic record data on flows, also can be delivered to floor synthetic reception system by telephone wire or the related netting twine of special laying.Due to
Four is bottom containing weak watery is belonged to, in order that flow sensor can sense flow, underground blow-off line has carried out five reducings,
The diameter of blow-off line is reduced step by step, it is better.Wherein, flow automatic recording instrument 23 can be arranged in sensor protective cover.
In sum, the present invention for carrying out bailing test to a certain water-bearing layer and unrestrained water test is generally taken respectively at present
Carried out from independent mode, general drilling by ground construction carries out bailing test, actual feelings of the unrestrained water drilling hole in underground construction
Condition, design and implement it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground.The drilling equipment
Mainly it is made up of floor synthetic reception system, bailing test and the part of unrestrained water test three, takes into full account bailing test or unrestrained
The need for water test, a hole is dual-purpose, overcomes underground to be typically inconvenient to the shortcoming constructed, and realize ground real-time automatic monitoring target
The quantized datas such as the water level and water temperature in water-bearing layer.
The present invention by by the characteristics of ground is easily constructed, with reference to surface-underground contrast plan, construction collection draw water with it is unrestrained
Water test leads directly to down-hole drilling device in the ground of one, and the water-bearing layer property that can over the ground descend certain depth to detect in advance is carried out in real time
Monitoring.By ground construction lead directly to down-hole drilling, using in tunnel in advance install gate valve, can carry out at any time bailing test or
Unrestrained water test, and water level and water temperature data real-time reception are carried out in ground, so that accurate quantification judges monitored water-bearing layer
Hydrogeological parameter.The device is particularly adapted to underworkings and is not suitable for unrestrained water drilling hole of constructing, and is then compareed up and down according to well
The location drawing is easy to the situation of construction on ground.Realize and draw water while with unrestrained water test, can real-time monitoring water-bearing layer
The states such as water level, water temperature, solve to draw water cumbersome with link caused by the independent construction drill of unrestrained water test at present, and technique is multiple
It is miscellaneous, problem that is whard to control and cannot be used for the far distance automatic monitoring in ground.Generally speaking, the invention has the advantages that：
(1) ground convenient construction, integrates three parts, draws water and carry out with discharging water to interact as needed；
(2) can Real-time Collection and analyze data automatically, calculate data and be easy to get reliability；
(3) probing expense is saved, unrestrained amount is adjusted as needed, and can long-term use.
Claims (4)
1. it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground, including for carrying out bailing test
Bailing test device and be used to carry out the unrestrained water test device of unrestrained water test in underworkings, its feature exists
In, also including the drilling by the straight-through underground in ground and the floor synthetic reception device for the aqueous layer state of real-time monitoring,
Anti- silk sealing sleeve pipe a, taper water-stop, drainage floral tube, sand setting reality have been sequentially arranged by ground to underground in the drilling
Pipe and anti-silk sealing sleeve pipe b, drainage floral tube are located at water-bearing layer, and sand casing is disposed with sand setting reality pipe；The anti-silk water-baffling sleeve
Pipe and anti-silk sealing sleeve pipe b are managed admittedly entirely by cement mortar in fact for pipe a, taper water-stop, sand setting；Water-level and water-temperature is installed in drilling
Sensor；
Ring flange and the blow-off line of mounting flange that five diameters that the unrestrained water test device include differ, five
Reducing is arranged in underworkings individual ring flange step by step, respectively first flange disk, second flange disk, the 3rd ring flange, the 4th
Ring flange and the 5th ring flange, the blow-off line between first flange disk and second flange disk are peace in T-shaped pipeline, T-shaped pipeline
Equipped with the sand net for filtering sand grains, the bottom of T-shaped pipeline is provided with lets out sand valve；Between 3rd ring flange and the 4th ring flange
Magnetic vortex flow sensor for detecting unrestrained water-carrying capacity is installed on blow-off line；
Foot of hole is connected by drainage pipeline with unrestrained water test device, and gate valve is provided with drainage pipeline；
The data that water-level and water-temperature sensor, magnetic vortex flow sensor will be detected send floor synthetic reception device to；
By drilling, using gate valve, bailing test or unrestrained water test can be at any time carried out, and water level and water temperature number are carried out in ground
According to real-time reception, so that accurate quantification judges monitored water-bearing layer hydrogeological parameter.
2. it is according to claim 1 it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground,
Characterized in that, being welded with iron wire on the outside of the drainage floral tube, iron has been tied up in three layers of nylon wire of outsourcing, the outside segmentation of nylon wire
Silk.
3. it is according to claim 1 it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground,
Characterized in that, the floor synthetic reception device includes that monitoring system master station, data backup memory server and ground are distant
Examining system substation, the water level water that surface telemetry system substation receives water-level and water-temperature sensor, magnetic vortex flow sensor is detected
Warm, unrestrained water flow signal, and data backup memory server is backed up to, while send to monitoring system master station, it is real
Now to the data sampling and processing and query function of water-bearing layer hydrogeological parameter.
4. it is according to claim 1 it is a kind of integrate draw water and unrestrained water test the straight-through down-hole drilling device in ground,
Characterized in that, the concrete structure of the drilling is：
(1) 0-124.94m apertures Ф 270mm, under enter the anti-silk sealing sleeve pipe a and Ф 240mm taper water-stops of 194 × 8mm of Ф, and
Managed admittedly entirely with cement mortar；
(2) 124.94-154.20m apertures Ф 250mm, wherein, Ф 194 × 6mm drainage floral tubes are entered under 127.94-154.20m, manage
The road of outside weld 8# iron wires 8, three layers of 120 mesh nylon wire of outsourcing, the 16# iron wires segmentation of external application spacing 0.15m is tied up；156.00-
Enter 146 × 8mm of Ф sand settings pipe and Ф 127 × 4mm sand casings in fact under 158.00m, and managed admittedly entirely with cement mortar；
(3) 158.00-225.00m apertures Ф 113mm, under enter the anti-silk sealing sleeve pipe b of 89 × 4.5mm of Ф, it is and entirely solid with cement mortar
Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129434.7A CN106761674B (en) | 2016-12-09 | 2016-12-09 | It is a kind of integrate draw water and the ground of unrestrained water test lead directly to down-hole drilling device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129434.7A CN106761674B (en) | 2016-12-09 | 2016-12-09 | It is a kind of integrate draw water and the ground of unrestrained water test lead directly to down-hole drilling device |
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| CN106761674A true CN106761674A (en) | 2017-05-31 |
| CN106761674B CN106761674B (en) | 2019-06-25 |
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| CN201611129434.7A Expired - Fee Related CN106761674B (en) | 2016-12-09 | 2016-12-09 | It is a kind of integrate draw water and the ground of unrestrained water test lead directly to down-hole drilling device |
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| CN110374620A (en) * | 2019-08-25 | 2019-10-25 | 贵州大学 | The exploitation of mining heading equipment is crushed header structure |
| CN111140167A (en) * | 2019-12-12 | 2020-05-12 | 张盼杰 | Straight-through water drainage drilling construction method for coal seam mining under conglomerate aquifer |
| CN112855260A (en) * | 2021-02-03 | 2021-05-28 | 中煤科工集团西安研究院有限公司 | Method for quickly dredging and descending all areas of underground curtain after closure |
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| CN112855260A (en) * | 2021-02-03 | 2021-05-28 | 中煤科工集团西安研究院有限公司 | Method for quickly dredging and descending all areas of underground curtain after closure |
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| Publication number | Publication date |
|---|---|
| CN106761674B (en) | 2019-06-25 |
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