CN109653787B - Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group - Google Patents
Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group Download PDFInfo
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- CN109653787B CN109653787B CN201910072920.7A CN201910072920A CN109653787B CN 109653787 B CN109653787 B CN 109653787B CN 201910072920 A CN201910072920 A CN 201910072920A CN 109653787 B CN109653787 B CN 109653787B
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- 239000003245 coal Substances 0.000 title claims abstract description 114
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000605 extraction Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 76
- 238000011282 treatment Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 238000005065 mining Methods 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Pipeline Systems (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group, which is characterized in that a vertical drilling hole is formed, coal seam drilling holes communicated with all coal seams are formed in the vertical drilling hole, high-pressure water is injected into the vertical drilling hole and the coal seam drilling holes to realize fracturing of the coal seams, after the coal seams are fractured, the high-pressure water is extracted, a drainage main pipe is arranged in the vertical drilling hole, a gas extraction branch pipe is arranged in the coal seam drilling hole, a drainage branch pipe is arranged in the drainage branch pipe, and corresponding valves are arranged in the drainage drilling hole, so that stored water of the gas and the water bearing layers is extracted sequentially, and the method has the advantages of simple construction procedure, low cost and high drainage and drainage efficiency.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group.
Background
Coal formations in eastern mining areas in China are mostly in coal seam group conditions, coal seam gas pressure is high and is often accompanied by an aquifer, mining difficulty is extremely high, in order to prevent accidents such as gas, water damage and the like, safe mining is carried out, on the one hand, drilling is carried out on the coal seam, and the gas is discharged before the coal seam mining; on the other hand, drilling water is needed to be drained to the aquifer, the existing extraction pressure relief and drainage measures have complex construction procedures, high cost and low extraction and drainage efficiency.
Disclosure of Invention
The invention provides a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group, which can simplify a construction procedure, reduce cost and improve extraction and drainage efficiency.
The invention provides a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group, which comprises the following steps:
Detecting the distribution condition of coal beds and the occurrence condition of each coal bed and an aquifer;
vertical drilling holes are formed in the ground to penetrate through each coal seam until the coal seam is the bottommost layer, and corresponding coal seam drilling holes are formed in the hole walls of the vertical drilling holes penetrating through each coal seam position and towards each coal seam;
arranging a drainage main pipe in the vertical drilling holes, arranging gas drainage branch pipes connected with the drainage main pipe in each coal seam drilling hole, injecting high-pressure water into the coal seam drilling holes through the drainage main pipe and the gas drainage branch pipes, carrying out fracturing treatment on each coal seam, and draining the high-pressure water after each coal seam is fractured;
After the high-pressure water is pumped away, a drainage drilling hole communicated with the aquifer is formed in the vertical drilling hole; a drainage branch pipe connected with the drainage main pipe is arranged in the drainage drilling hole, a main valve is arranged on the drainage main pipe, a gas drainage valve is arranged on the gas drainage branch pipe, and a drainage valve is arranged on the drainage branch pipe;
Arranging extraction equipment connected with the drainage main pipe outside the vertical drilling hole, starting the extraction equipment, opening the main valve and the gas extraction valve, and carrying out gas extraction on each coal seam;
and when the gas concentration in the coal bed is reduced to a safe range, closing the gas extraction valve, and opening the drainage valve to extract water stored in the water-containing layer.
Further, the coal seam boreholes are radially distributed within each coal seam.
Further, the method may further include, while performing the step of fracturing treatments of the respective coal seams: and selecting proper proppants and sand adding amounts according to the characteristic properties of each coal seam.
Further, the drainage drill hole is a hole body which is obliquely arranged from the vertical drill hole to the inside of the aquifer at a certain angle.
Further, the main valve, the gas extraction valve and the drain valve are all electronic valves uniformly controlled by an external control unit.
According to the embodiment of the invention, the vertical drilling holes are formed, the coal seam drilling holes communicated with all coal seams are formed in the vertical drilling holes, high-pressure water is injected into the vertical drilling holes and the coal seam drilling holes to realize fracturing of the coal seams, after the coal seams are fractured, the high-pressure water is pumped out, the drainage drilling holes are arranged to communicate the vertical drilling holes with the aquifer, the drainage main pipe is arranged in the vertical drilling holes, the gas drainage branch pipes are arranged in the coal seam drilling holes, the drainage branch pipes are arranged in the drainage drilling holes, and corresponding valves are arranged to sequentially drain the stored water of the gas and the aquifer, so that the multi-purpose one-hole one-pipe gas-drainage and high-pressure water are realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group according to a first embodiment of the invention;
fig. 2 is a schematic diagram of an implementation structure of a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a gas extraction branch pipe matching structure in each coal seam of a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Referring to fig. 1, a schematic flow chart of a coordinated extraction pressure relief method for a high-pressure water and high-gas coal seam group according to an embodiment of the invention includes the following steps S101 to S106:
step S101: detecting the distribution condition of the coal seam and the occurrence condition of each coal seam and the water-bearing layer.
Step S102: and (3) vertically drilling holes from the ground to penetrate through each coal seam until the coal seam is at the bottommost layer, and opening corresponding coal seam drilling holes in each coal seam on the hole wall of the vertically drilled holes penetrating through each coal seam.
Step S103: arranging a drainage header pipe in the vertical drilling holes, arranging gas drainage branch pipes connected with the drainage header pipe in each coal seam drilling hole, injecting high-pressure water into the coal seam drilling holes through the drainage header pipe and the gas drainage branch pipes, carrying out fracturing treatment on each coal seam, and pumping out the high-pressure water after each coal seam is fractured.
Step S104: after the high-pressure water is pumped away, a drainage drilling hole communicated with the aquifer is formed in the vertical drilling hole, a drainage branch pipe connected with a drainage main pipe is arranged in the drainage drilling hole, a main valve is arranged on the drainage main pipe, a gas extraction valve is arranged on the gas extraction branch pipe, and a drainage valve is arranged on the drainage branch pipe.
Step S105: and (3) arranging extraction equipment connected with the drainage main pipe outside the vertical drilling hole, starting the extraction equipment, opening a main valve and a gas extraction valve, and carrying out gas extraction on each coal seam.
Step S106: and when the gas concentration in the coal bed is reduced to a safe range, closing the gas extraction valve, and opening the drainage valve to extract water stored in the water-containing layer.
Specifically, referring to fig. 2, taking three layers of coal seams (such as coal seam 1, coal seam 2 and coal seam 3 in the figure) as examples, detecting occurrence of the coal seams 1,2,3 and the water-bearing layer 4; a vertical drilling 6 is carried out from the ground 5, penetrates through the coal seam 1 and the coal seam 2 and reaches the coal seam 3; implementing coal seam drilling 7 in the coal seam 1, the coal seam 2 and the coal seam 3; injecting high-pressure water into the vertical drilling holes 6 and the coal seam drilling holes 7, fracturing the coal seam 1 and the coal seam 2 to the coal seam 3 by using the high-pressure water to generate coal seam cracks 16, and improving the air permeability of the coal seam; pumping high-pressure water in the vertical drilling hole 6 and the coal seam drilling hole 7; drilling a drainage borehole 8 from the vertical borehole 6 to the aquifer 4; a suction and discharge main pipeline 9 is arranged in the vertical drilling hole 6; a gas extraction branch pipeline 10 is arranged in the coal seam drilling hole 7; a drainage branch pipe 11 is arranged in the drainage drill hole 8; a main valve 12, a gas extraction valve 13 and a drain valve 14 are arranged; a drainage device 15 is arranged near the vertical drilling hole 6; starting the extraction equipment 15, opening the main valve 12 and the gas extraction valve 13, and extracting coal seam 1, coal seam 2 and coal seam 3 coal seam gas; the gas extraction valve 13 is closed, the drain valve 14 is opened, and the high-pressure water in the water-bearing layer 4 is extracted. In a specific implementation, the diameter of the vertical drilling hole 6 is set to be not smaller than 150mm, so that the vertical drilling hole meets the extraction requirement of one hole and one pipe, and the extraction efficiency is improved.
Specifically, through setting up a vertical drilling to set up the coal seam drilling that communicates to each coal seam in the vertical drilling, inject high-pressure water into vertical drilling and coal seam drilling and realize the fracturing of coal seam, after the coal seam fracturing, take out high-pressure water, set up hydrophobic drilling again and communicate vertical drilling and aquifer, arrange drainage house steward in the vertical drilling, arrange the gas drainage branch pipe in the coal seam drilling, arrange hydrophobic branch pipe in hydrophobic drilling, and install corresponding valve, take out the storage water of gas and aquifer in proper order, thereby realize "one hole one pipe multi-purpose" and take out coal seam gas and high pressure-bearing water, it is simple to have the construction procedure, with low costs, and take out, dredge the efficient advantage of drainage.
Further, referring to fig. 3, coal seam boreholes 7 are radially distributed within each coal seam.
Specifically, coal seam drilling holes 7 are radially formed in each coal seam, so that uniform fracturing of each coal seam and thorough drainage of coal seam gas are ensured.
Further with reference to fig. 2, the drainage borehole 8 is a body of a hole that is inclined at an angle from the vertical borehole 6 into the aquifer 4.
Specifically, since the stored water in the aquifer 4 has a certain pressure, a certain buffer effect can be generated on the stored water in the aquifer 4 by adopting inclined drilling, so that the safety of drilling construction is ensured.
Further, the main valve 12, the gas extraction valve 13 and the drain valve 14 are all electronic valves which are uniformly controlled by an external control unit.
Specifically, the main valve 12, the gas extraction valve 13 and the drain valve 14 are all electronic valves, and the external control unit uniformly controls the opening and closing of the valves, so that each pipeline can be controlled in time and continuously, and the extraction working efficiency is improved.
In the embodiments provided by the present application, it should be understood that the disclosure is only illustrative and may be implemented in other ways.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (3)
1. The coordinated extraction pressure relief method for the high-pressure water and high-gas coal seam group is characterized by comprising the following steps of:
Detecting the distribution condition of coal beds and the occurrence condition of each coal bed and an aquifer;
vertical drilling holes are formed in the ground to penetrate through each coal seam until the coal seam is the bottommost layer, and corresponding coal seam drilling holes are formed in the hole walls of the vertical drilling holes penetrating through each coal seam position and towards each coal seam;
arranging a drainage main pipe in the vertical drilling holes, arranging gas drainage branch pipes connected with the drainage main pipe in each coal seam drilling hole, injecting high-pressure water into the coal seam drilling holes through the drainage main pipe and the gas drainage branch pipes, carrying out fracturing treatment on each coal seam, and draining the high-pressure water after each coal seam is fractured;
After the high-pressure water is pumped away, a drainage drilling hole communicated with the aquifer is formed in the vertical drilling hole, the drainage drilling hole is a hole body which is obliquely formed from the vertical drilling hole to the aquifer at a certain angle, a drainage branch pipe connected with the drainage main pipe is arranged in the drainage drilling hole, a main valve is arranged on the drainage main pipe, a gas extraction valve is arranged on the gas extraction branch pipe, and a drainage valve is arranged on the drainage branch pipe;
Arranging extraction equipment connected with the drainage main pipe outside the vertical drilling hole, starting the extraction equipment, opening the main valve and the gas extraction valve, and carrying out gas extraction on each coal seam;
And when the gas concentration in the coal bed is reduced to a safe range, closing the gas extraction valve, and opening the drainage valve to extract water stored in the water-containing layer.
2. The method for coordinated drainage and pressure relief of a high-pressure water and high-gas coal seam group according to claim 1, wherein the coal seam drill holes are radially distributed in each coal seam.
3. The coordinated extraction pressure relief method of a high-pressure-bearing water high-gas coal seam group according to claim 1, wherein the main valve, the gas extraction valve and the drainage valve are all electronic valves uniformly controlled by an external control unit.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910072920.7A CN109653787B (en) | 2019-01-25 | 2019-01-25 | Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group |
| PCT/CN2019/096402 WO2020151207A1 (en) | 2019-01-25 | 2019-07-17 | Coordinative extraction and pressure relief method for high confined water high gas coal seam group |
| ZA2020/00363A ZA202000363B (en) | 2019-01-25 | 2020-01-20 | Method for coordinate extraction and pressure relief of high-pressure water and high-gas coal seam groups |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910072920.7A CN109653787B (en) | 2019-01-25 | 2019-01-25 | Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109653787A CN109653787A (en) | 2019-04-19 |
| CN109653787B true CN109653787B (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910072920.7A Active CN109653787B (en) | 2019-01-25 | 2019-01-25 | Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN109653787B (en) |
| WO (1) | WO2020151207A1 (en) |
| ZA (1) | ZA202000363B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653787B (en) * | 2019-01-25 | 2024-05-03 | 安徽理工大学 | Coordinated extraction pressure relief method for high-pressure-bearing water and high-gas coal seam group |
| CN113123720A (en) * | 2021-03-22 | 2021-07-16 | 中国煤炭地质总局水文地质局 | Construction process for treating grouting holes and simultaneously using grouting holes as gas extraction holes in water damage area of coal seam floor |
| CN113107583A (en) * | 2021-05-21 | 2021-07-13 | 中国矿业大学 | Thick and hard roof high-gas coal seam gas extraction system and extraction method |
| CN114837646B (en) * | 2022-05-05 | 2023-11-24 | 中联煤层气国家工程研究中心有限责任公司 | Multilayer co-mining device for coal bed gas mining |
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| Publication number | Publication date |
|---|---|
| WO2020151207A1 (en) | 2020-07-30 |
| CN109653787A (en) | 2019-04-19 |
| ZA202000363B (en) | 2020-12-23 |
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