CN112145073B - In-situ controllable coal and gas outburst process physical simulation method - Google Patents
In-situ controllable coal and gas outburst process physical simulation method Download PDFInfo
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- CN112145073B CN112145073B CN202011039312.5A CN202011039312A CN112145073B CN 112145073 B CN112145073 B CN 112145073B CN 202011039312 A CN202011039312 A CN 202011039312A CN 112145073 B CN112145073 B CN 112145073B
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- 239000003245 coal Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000008569 process Effects 0.000 title claims abstract description 31
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 21
- 238000004088 simulation Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000013135 deep learning Methods 0.000 claims abstract description 5
- 230000005284 excitation Effects 0.000 claims description 36
- 238000000605 extraction Methods 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 2
- 238000005065 mining Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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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
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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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
- E21B34/00—Valve arrangements for boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
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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
- E21B47/00—Survey of boreholes or wells
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses an in-situ controllable physical simulation method for a coal and gas outburst process, which is suitable for researching a coal and gas outburst mechanism in a coal mine. Firstly, constructing coal and gas outburst exciting drill holes and parameter testing drill holes in an in-situ high gas outburst coal seam, and then respectively placing a gas pressure sensor, a stress sensor and a temperature sensor in each group of parameter testing drill holes and sealing the holes. After monitoring parameters of all the sensors are stable, high-pressure water jet generated by the water jet generating device impacts the coal and gas outburst to excite the hole wall of the drilled hole to induce the coal and gas outburst, and surrounding parameters are utilized to test the gas pressure, stress and temperature change of the drilled hole in the process of exciting the coal and gas outburst. And analyzing the obtained gas pressure, stress and temperature data by adopting a deep learning algorithm to obtain the critical conditions of coal and gas outburst. The method is simple to operate, low in cost and high in safety, and can reflect the coal and gas outburst process more truly.
Description
Technical Field
The invention relates to the field of coal mining, in particular to a physical simulation method for an in-situ controllable coal and gas outburst process.
Background
Coal and gas outburst is an extremely complex typical dynamic disaster in the underground mining process of a coal mine, and seriously threatens the safety production of a mine. In recent years, despite a great number of prevention measures, with the increase of the mining depth and strength of coal mines, the mining environment of mines is continuously deteriorated, coal beds in shallow geological structures are more complex, the ground stress and the gas pressure of the coal beds are continuously increased, the gas permeability of the coal beds is low, gas extraction is extremely difficult, and the coal and gas outburst risk is still serious. The appearance of coal and gas outburst is a complex problem relating to a plurality of fields, and the outstanding mechanism is still an international and century-oriented problem up to now.
At present, the research aiming at the coal and gas outburst mechanism in China is mostly based on laboratory tests or numerical simulation. The physical and mechanical boundaries and initial conditions of an in-situ coal seam cannot be accurately reproduced in the current research, and the actual coal and gas outburst generation process on the site cannot be accurately reflected by the research results. In addition, the coal and gas outburst process for developing the in-situ coal bed has extremely high cost and great danger, and the safety and controllability of the outburst excitation process are difficult to realize. Therefore, in order to research the mechanism and critical criterion of coal and gas outburst occurrence of the in-situ coal bed, a physical simulation method of the in-situ controllable coal and gas outburst process is urgently required to be sought so as to better prevent and control coal and gas outburst disasters.
Disclosure of Invention
In view of the technical defects, the invention aims to provide an in-situ controllable physical simulation method for a coal and gas outburst process, which is simple to operate, low in cost, high in safety and capable of reflecting the coal and gas outburst process more truly.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides an in-situ controllable physical simulation method for a coal and gas outburst process, which specifically comprises the following steps:
s1: firstly, constructing a coal and gas outburst excitation drilling hole in a high gas outburst coal seam in a roadway, and then constructing a plurality of groups of parameter testing holes on two sides of the coal and gas outburst excitation drilling hole respectively, wherein the number of the parameter testing holes in each group is not less than three;
s2: at least one gas pressure sensor, one stress sensor and one temperature sensor are arranged in each group of parameter testing holes, wherein each parameter testing hole is provided with one sensor, each sensor is electrically connected with an external PC (personal computer) respectively, and finally, the holes are sealed; the distances between each group of parameter test holes arranged on one side of the coal and gas outburst excitation drill hole and the coal and gas outburst excitation drill hole are a, a +1 and a +2 … … respectively, and the distances between each group of parameter test holes arranged on the other side of the coal and gas outburst excitation drill hole and the coal and gas outburst excitation drill hole are a +0.5, a +1.5 and a +2.5 … … respectively;
s3: selecting a proper drill rod to be communicated with a water jet generating device, then placing a drill bit of the water jet generating device into the coal and gas outburst excitation drilling hole, mounting a blowout preventing hole device on the drill rod, wherein the blowout preventing hole device is connected with a ventilation liquid-solid separator through a pipeline, and the pipeline is provided with a valve II;
s4: after the monitoring data in each group of parameter testing holes are stable, starting a water jet generating device, and carrying out impact operation on the hole wall of the coal and gas outburst excitation drill hole by water jet flow through a drill rod; simultaneously opening the orifice-preventing device and the valve II, and introducing gas, water and coal generated in the coal and gas outburst excitation process into a gas-liquid-solid separator for separation through a pipeline;
s5: opening each sensor in each group of parameter testing holes by using a PC (personal computer), and monitoring the change of gas pressure, stress and temperature around the coal and gas outburst excited drill hole in the water jet impact process;
s6: and analyzing gas pressure, stress and temperature data by adopting a deep learning algorithm to obtain the critical conditions of coal and gas outburst.
Preferably, in step S1, three sets of parameter testing holes are respectively disposed on two sides of the coal and gas outburst excitation drill hole, wherein three parameter testing holes are respectively constructed in each set of parameter testing holes.
Preferably, in step S2, the gas pressure sensor, the stress sensor, and the temperature sensor on both sides of the coal and gas outburst excitation borehole are horizontally arranged in line, respectively.
Preferably, in step S2, a takes a value of 0.5m to 1 m.
Preferably, in step S4, the gas-liquid-solid separator is communicated with a gas extraction pipeline, a first valve is arranged on the gas extraction pipeline, the first valve is opened simultaneously when the water jet flow generating device operates, and the gas extraction pipeline is communicated with an external extraction machine to extract gas stored in the gas-liquid-solid separator.
The invention has the beneficial effects that: according to the invention, coal and gas outburst exciting drill holes and parameter testing drill holes are constructed in the in-situ high gas outburst coal seam, a water jet impact technology is combined, the coal and gas outburst process under the in-situ condition is simulated, and the change of gas pressure, stress and temperature around the coal and gas outburst exciting drill holes in the water jet impact process is monitored by using a sensor; analyzing gas pressure, stress and temperature data by adopting a deep learning algorithm, and acquiring critical conditions of coal and gas outburst; the method is simple to operate, low in cost and high in safety, and can reflect the coal and gas outburst process more truly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of positions of coal and gas outburst excitation drill holes and each group of parameter test holes in an in-situ controllable physical simulation method for a coal and gas outburst process according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the positions of the test holes of each group of parameters in the in-situ controllable coal and gas outburst process physical simulation method according to the embodiment of the invention.
Description of reference numerals:
1-parameter test wells; 2-a blowout hole preventing device, 3-a drill rod, 4-a gas-liquid separator, 5-a gas extraction pipeline, 6-a water jet generating device, 7-a valve I, 8-a valve II, 9-a high gas outburst coal layer and 10-coal and gas outburst excitation drilling.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 2, a physical simulation method for an in-situ controllable coal and gas outburst process specifically includes the following steps:
s1: firstly, constructing a coal and gas outburst excitation drilling hole 10 in a high gas outburst coal seam 9 from a roadway, and then constructing three groups of parameter testing holes 1 on two sides of the coal and gas outburst excitation drilling hole 10 respectively, wherein the number of each group of parameter testing holes 1 is 3;
s2: a gas pressure sensor, a stress sensor and a temperature sensor are sequentially placed in each group of parameter testing holes 1, each sensor is electrically connected with an external PC respectively, and finally hole sealing is carried out; the gas pressure sensors, the stress sensors and the temperature sensors on the two sides are respectively horizontally arranged in a collinear manner, the distance between each group of parameter testing holes 1 arranged on the left side of the coal and gas outburst excitation drill hole 10 and the coal and gas outburst excitation drill hole 10 is respectively 0.5m, 1.5m and 2.5m, and the distance between each group of parameter testing holes 1 arranged on the right side of the coal and gas outburst excitation drill hole 10 and the coal and gas outburst excitation drill hole 10 is respectively 1m, 2m and 3 m;
s3: selecting a proper drill rod 3 to be communicated with a water jet generating device 6, then placing a drill bit of the water jet generating device into a coal and gas outburst excitation drilling hole 10, installing an anti-spraying hole device 2 on the drill rod 3, connecting the anti-spraying hole device 2 with a ventilation liquid-solid separator 4 through a pipeline, and arranging a valve II 8 on the pipeline;
s4: after the monitoring data in each group of parameter testing holes 1 are stable, starting a water jet generating device 6, and carrying out impact operation on the hole wall of the coal and gas outburst excitation drilling hole 10 by the water jet through a drill rod 3; simultaneously opening the blowout preventing hole device 2 and the valve II 8, and introducing gas, water and coal generated in the coal and gas outburst excitation process into a gas-liquid-solid separator 4 through a pipeline for separation; the gas-liquid-solid separator 4 is communicated with a gas extraction pipeline 5, a first valve 7 is arranged on the gas extraction pipeline 5, the first valve 7 is opened when the water jet flow generating device 6 operates, and the gas extraction pipeline 5 is communicated with an external extraction machine so as to extract gas stored in the gas-liquid-solid separator 4;
s5: opening each sensor in each group of parameter testing holes 1 by using a PC (personal computer), and monitoring the change of gas pressure, stress and temperature around the coal and gas outburst excitation drill hole 10 in the water jet impact process;
s6: and analyzing gas pressure, stress and temperature data by adopting a deep learning algorithm to obtain the critical conditions of coal and gas outburst.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. An in-situ controllable coal and gas outburst process physical simulation method is characterized by comprising the following steps:
s1: firstly, constructing a coal and gas outburst excitation drilling hole (10) in a high gas outburst coal seam (9) from a roadway, and then constructing a plurality of groups of parameter testing holes (1) on two sides of the coal and gas outburst excitation drilling hole (10) respectively, wherein the number of the parameter testing holes (1) in each group is not less than three;
s2: at least one gas pressure sensor, one stress sensor and one temperature sensor are arranged in each group of parameter testing holes (1), wherein each parameter testing hole (1) is provided with one sensor, each sensor is respectively and electrically connected with an external PC (personal computer), and finally, the holes are sealed; the distances between each group of parameter testing holes (1) arranged on one side of the coal and gas outburst excitation drill hole (10) and the coal and gas outburst excitation drill hole (10) are a, a +1 and a +2 … … respectively, and the distances between each group of parameter testing holes (1) arranged on the other side of the coal and gas outburst excitation drill hole (10) and the coal and gas outburst excitation drill hole (10) are a +0.5, a +1.5 and a +2.5 … … respectively;
s3: selecting a proper drill rod (3) to be communicated with a water jet generating device (6), then placing a drill bit of the water jet generating device into a coal and gas outburst excitation drilling hole (10), installing a blowout prevention hole device (2) on the drill rod (3), connecting the blowout prevention hole device (2) with a ventilation liquid-solid separator (4) through a pipeline, and arranging a valve II (8) on the pipeline;
s4: after the monitoring data in each group of parameter testing holes (1) are stable, starting a water jet generating device (6), and performing impact operation on the hole wall of the coal and gas outburst excitation drilling hole (10) by the water jet through a drill rod (3); simultaneously opening the anti-spraying hole device (2) and a valve II (8), and introducing gas, water and coal generated in the coal and gas outburst excitation process into a gas-liquid-solid separator (4) through a pipeline for separation;
s5: opening each sensor in each group of parameter testing holes (1) by using a PC (personal computer), and monitoring the change of gas pressure, stress and temperature around the coal and gas outburst excitation drill hole (10) in the water jet impact process;
s6: and analyzing gas pressure, stress and temperature data by adopting a deep learning algorithm to obtain the critical conditions of coal and gas outburst.
2. The in-situ controllable physical simulation method for coal and gas outburst process according to claim 1, wherein in step S1, three sets of parameter testing holes (1) are respectively formed at two sides of the coal and gas outburst excitation drilling hole (10), wherein three parameter testing holes (1) are respectively formed in each set.
3. The in-situ controllable physical simulation method for coal and gas outburst process according to claim 1, wherein in step S2, the gas pressure sensor, the stress sensor and the temperature sensor on both sides of the coal and gas outburst excitation borehole (10) are respectively horizontally arranged in a collinear manner.
4. The in-situ controllable coal and gas outburst process physical simulation method of claim 1, wherein in step S2, a takes a value of 0.5m to 1 m.
5. The in-situ controllable coal and gas outburst process physical simulation method according to claim 1, characterized in that in step S4, the gas-liquid-solid separator (4) is communicated with the gas extraction pipeline (5), the gas extraction pipeline (5) is provided with a first valve (7), the first valve (7) is opened when the water jet generating device (6) operates, and the gas extraction pipeline (5) is communicated with an external extraction machine to further extract gas accumulated in the gas-liquid-solid separator (4).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100612A (en) * | 2017-04-17 | 2017-08-29 | 山东科技大学 | Investigate method in a kind of downhole hydraulic pressure break influence area |
| CN107503727A (en) * | 2017-10-16 | 2017-12-22 | 重庆大学 | A kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method |
| CN108798630A (en) * | 2018-04-28 | 2018-11-13 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining simulation experiment system |
| CN110953013A (en) * | 2019-12-05 | 2020-04-03 | 中煤科工集团西安研究院有限公司 | Controllable jet flow punching pressure relief and permeability increase device and method for soft coal seam |
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2020
- 2020-09-28 CN CN202011039312.5A patent/CN112145073B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100612A (en) * | 2017-04-17 | 2017-08-29 | 山东科技大学 | Investigate method in a kind of downhole hydraulic pressure break influence area |
| CN107503727A (en) * | 2017-10-16 | 2017-12-22 | 重庆大学 | A kind of layer hydraulic fracturing scope of wearing based on in-situ stress monitoring investigates method |
| CN108798630A (en) * | 2018-04-28 | 2018-11-13 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining simulation experiment system |
| CN110953013A (en) * | 2019-12-05 | 2020-04-03 | 中煤科工集团西安研究院有限公司 | Controllable jet flow punching pressure relief and permeability increase device and method for soft coal seam |
Non-Patent Citations (1)
| Title |
|---|
| 水射流切槽诱导高瓦斯煤体失稳喷出机制与应用;沈春明等;《煤炭学报》;20150915(第09期);正文第1.4节、第4节，图2、图8 * |
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