CN114482932A - Method for achieving preset coal seam gas extraction through cross-layer drilled gas coal seam - Google Patents
Method for achieving preset coal seam gas extraction through cross-layer drilled gas coal seam Download PDFInfo
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- CN114482932A CN114482932A CN202210068786.5A CN202210068786A CN114482932A CN 114482932 A CN114482932 A CN 114482932A CN 202210068786 A CN202210068786 A CN 202210068786A CN 114482932 A CN114482932 A CN 114482932A
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- 239000003245 coal Substances 0.000 title claims abstract description 128
- 238000000605 extraction Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007789 gas Substances 0.000 claims abstract description 115
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- 239000006260 foam Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000005336 cracking Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011435 rock Substances 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
- 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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- 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
- E21B43/006—Production of coal-bed methane
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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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
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- 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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- Chemical Kinetics & Catalysis (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
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Abstract
The invention discloses a method for realizing gas extraction of a preset coal seam by drilling through a layer, aiming at drilling through a coal seam containing gas 14 and 13 to a coal seam containing gas 9 from a mined coal seam No. 15 upwards in a layer-crossing manner and performing high-efficiency gas extraction of the coal seams No. 14, 13 and 9 in two sections. The method mainly comprises the following steps: drilling holes by using a drilling machine, sealing holes of No. 14 and No. 13 coal seams by using upper and lower packers, fracturing the No. 14 and No. 13 coal seams by adding sand into liquid nitrogen foam, releasing pressure to extract gas of the No. 14 and No. 13 coal seams, removing the sealing holes of the No. 14 and No. 13 coal seams by using the packers, sealing holes of the upper and lower packers for the No. 9 high-gas coal seams, fracturing the No. 9 coal seams by adding sand into the liquid nitrogen foam, and releasing pressure to extract gas of the No. 9 coal seams. The method can realize the segmented gas extraction of multiple coal seams under the coal mine, improve the gas extraction effect of the coal mine, improve the gas extraction rate, ensure the safe production of the coal mine, avoid the resource waste and realize the safety and high efficiency of the gas extraction of the coal mine.
Description
Technical Field
The invention mainly relates to the field of coal mine underground gas extraction, in particular to a method for extracting gas of a preset coal seam through a cross-layer drilled gas coal seam, which is suitable for extracting gas of different coal seams in a coal mine underground drilled hole section mode and realizing efficient extraction of gas of the preset coal seam.
Background
At present, the overall gas extraction effect of the coal mine in China is poor, and the concrete expression is that the gas extraction rate is low, so that the coal mine is not beneficial to safe production, and a large amount of resources are wasted. In 2020, the extraction rate of key coal mines in China is only about 40%, and the reason for low gas extraction rate of coal mines in China comes from two aspects: on one hand, the method is an objective reason, the coal seam is low in air permeability and soft, the gas extraction difficulty is high, and the extraction effect is seriously influenced; on the other hand, the method is subjective, and mainly shows that the extraction time is short, the drilling work amount is insufficient, the hole sealing quality is poor, the extraction method is single, and the extraction system is not matched and is not managed properly.
The method can be used for extracting the gas of multiple sections of coal seams by drilling in the underground coal mine, the air permeability of the coal seams is increased, the extraction time is longer, the hole sealing effect is excellent, the extraction method is novel, the coal mine gas extraction rate is greatly increased, the coal mine gas engineering quantity is reduced, the process is simplified, and the high-efficiency coal mine gas extraction is realized.
Disclosure of Invention
The invention provides a method for realizing predetermined coal seam gas extraction by drilling a gas coal seam through a cross-layer hole aiming at the problems of poor coal mine gas extraction effect, low gas extraction rate, influence on coal mine safety production, resource waste and the like, and aims to improve the coal mine gas extraction effect, improve the gas extraction rate, ensure coal mine safety production, avoid resource waste and realize high-efficiency coal mine gas extraction.
In order to achieve the purpose, the technical scheme of the invention is as follows: the invention discloses a method for realizing gas extraction of a preset coal seam by drilling a gas coal seam through a cross hole, aiming at drilling a coal seam containing gas 14 and 13 to a coal seam with high gas 9 upwards through a cross hole in a mined coal seam No. 15, and efficiently extracting the gas of the coal seams No. 14, 13 and 9 in two sections; mainly comprises the following steps: drilling holes by using a drilling machine, sealing holes of No. 14 and No. 13 coal beds by using upper and lower packers, flushing and cracking No. 14 and No. 13 coal beds by using liquid nitrogen foam sand, extracting gas of No. 14 and No. 13 coal beds by pressure relief, removing the sealing holes of the packers of No. 14 and No. 13 coal beds, sealing holes of the upper and lower packers of No. 9 high-gas coal beds, flushing and cracking No. 9 coal beds by using liquid nitrogen foam sand, and extracting gas of No. 9 coal beds by pressure relief.
A method for realizing gas extraction of a preset coal seam by drilling a gas coal seam through a cross-layer hole is characterized by comprising the following steps:
firstly, an upward drilling hole with an upward drilling inclination angle of 75 degrees penetrates through 14 and 13 adjacent coal seams containing gas in sequence to reach 1m above a top plate of a No. 9 coal seam with high gas, the diameter of the drilling hole is 91mm, and the drilling machine is withdrawn after the drilling hole is finished.
And step two, sealing the upward drilled hole by using a packer with the diameter of 91mm at the position 1m above the No. 13 coal seam top plate and the position 1m below the No. 14 coal seam bottom plate respectively, and pressurizing the packer by using liquid, wherein the sealing strength reaches more than 20MPa, and the drilled hole is sealed.
And step three, selecting a dual-purpose high-pressure pipe with the diameter of 30-60 mm according to the coal bed gas gathering degree, connecting the dual-purpose high-pressure pipe with a lower packer, exposing the dual-purpose high-pressure pipe to about 50mm, connecting the dual-purpose high-pressure pipe with a high-pressure pump by adopting a liquid nitrogen foam sand-adding fracturing method, installing a pressure gauge and a valve at the joint, injecting high-pressure liquid to fracture No. 14 and No. 13 coal beds, enabling the fracture to be tree-root-shaped, returning the liquid to relieve pressure by turning the valve after fracturing is completed to meet the gas extraction requirement, closing the valve and removing the high-pressure pump.
And step four, connecting the dual-purpose high-pressure pipe with a gas extraction pipe, arranging a flowmeter and a valve at the joint, performing pressure relief gas extraction after checking good gas tightness, monitoring the gas concentration of the flowmeter at all times, displaying, closing the valve and stopping gas extraction when the gas extraction concentration of No. 14 and No. 13 coal seams is lower than 0.5%.
And fifthly, releasing pressure of the packers at the coal seams of No. 14 and No. 13, pumping liquid in the packers, conveying the upper packer to a position 1m above the top plate of the No. 9 coal seam, conveying the lower packer to a position 1m below the bottom plate of the No. 9 coal seam, and pressurizing and sealing the holes.
And step six, carrying out coal bed number 9 fracturing in the same way as the coal bed fracturing method in the step three.
And seventhly, performing gas extraction on the No. 9 coal seam in the same way as the fourth gas extraction method.
And step eight, after all coal seam gas is completely extracted, firstly withdrawing the gas extraction pipe, then releasing pressure and recovering the packer, and finishing the sectional extraction of the No. 9 high gas coal seam, the No. 14 coal seam and the No. 13 coal seam containing the gas.
Further, in the step one, the diameter of the drill hole is selected to be 91mm, and the diameter of the packer can be selected according to the actual diameter of the drill hole such as 75mm, 110mm and the like, and the diameter of the packer is also selected in a corresponding change mode.
Furthermore, in the third step, the dual-purpose high-pressure pipe is used as a high-pressure hose for injecting back fracturing fluid and also used as an extraction pipe during gas extraction.
Further, in the fourth step, the gas display concentration index at the time of stopping extraction can be correspondingly changed according to the actual production.
The invention has the beneficial effects that: according to the invention, the packer is skillfully utilized to seal the upward drilled hole and can be effectively recovered, so that the time and labor consumption of sealing the side wall of the fractured coal bed by using cement paste after gas extraction can be avoided; by adopting a liquid nitrogen and sand adding fracturing method, the permeability of the coal bed is effectively increased, and the gas extraction rate is improved; the dual-purpose high-pressure pipe is adopted, so that the dual-purpose high-pressure pipe can be used as a high-pressure hose during fracturing and an extraction pipe for extracting gas, the space waste caused by the fact that the high-pressure hose is arranged and the extraction pipe is used is avoided, the manpower and material resources are saved, and the extraction efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a method for achieving gas extraction of a predetermined coal seam by extracting a gas-containing coal seam through a cross-cut borehole.
Fig. 2 is a schematic diagram of extraction of coal seams No. 13 and No. 14 in a method for extracting gas from a gas-containing coal seam by cross-layer drilling.
In the figure: (1) the mined coal seam No. 15 is mined; (2) is a No. 14 coal seam containing gas; (3) is a No. 13 coal seam containing gas; (4) the coal bed is a high gas No. 9 coal bed; (5) drilling upwards; (6) an upper packer; (7) a lower packer; (8) injecting a liquid return pipe for the packer; (9) is a dual-purpose high-pressure pipe; (10) is a valve; (11) a high-pressure pump for a packer; (12) is a rock formation.
Detailed Description
The method of the present invention is described in further detail below with reference to the accompanying detailed description.
The invention provides a method for realizing gas extraction of a preset coal seam by drilling a gas coal seam through a cross-layer hole, which comprises the following steps of:
the method comprises the steps that a drilling machine is used for drilling upward holes (5) with an upward inclination angle of 75 degrees, the upward holes sequentially penetrate through a No. 14 coal seam (2) containing gas and a No. 13 coal seam (3) containing gas to reach a position 1m above a top plate of a No. 9 high-gas coal seam (4), the diameter of each drilling hole (5) is 91mm, and the drilling machine is withdrawn after drilling is finished.
And step two, sealing the upward drill hole (5) at a position 1m above the top plate of the No. 13 coal seam (3) and a position 1m below the bottom plate of the No. 14 coal seam (2) by using packers (6 and 7) with the diameter of 91mm respectively, pressurizing the packers (6 and 7) by using liquid, and sealing the drill hole (5) when the sealing strength reaches more than 20 MPa.
Selecting a dual-purpose high-pressure pipe (9) with the diameter of 30-60 mm according to the enrichment degree of the coal bed gas, connecting the dual-purpose high-pressure pipe with a lower packer (7), and exposing the dual-purpose high-pressure pipe by about 50 mm; connecting a dual-purpose high-pressure pipe (9) with a high-pressure pump by adopting a liquid nitrogen foam sand-adding fracturing method, attaching a pressure gauge and a valve (10) at the joint, and injecting high-pressure liquid to fracture No. 14 and No. 13 coal beds (2 and 3), wherein the fracture is in a tree root shape; and after fracturing is completed to meet the gas extraction requirement, returning the liquid by the rotary valve (10) for pressure relief, closing the valve (10) after the liquid is returned, and removing the high-pressure pump.
And step four, connecting the dual-purpose high-pressure pipe (9) with a gas extraction pipe, arranging a flowmeter and a valve (10) at the joint, performing pressure relief gas extraction after checking good gas tightness, monitoring the gas concentration of the flowmeter at all times, displaying, and closing the valve to stop gas extraction when the gas extraction concentration of No. 14 and No. 13 coal seams (2 and 3) is lower than 0.5%.
And fifthly, releasing pressure of the packers (6 and 7) at the coal seams (2 and 3) of No. 14 and No. 13, pumping back gas or liquid in the packers (6 and 7), conveying the upper packer (6) to a position 1m above the top plate of the coal seam (4) of No. 9, conveying the lower packer (7) to a position 1m below the bottom plate of the coal seam (4) of No. 9, and filling pressure to seal holes.
And step six, carrying out the coal bed (4) No. 9 by adopting the same coal bed cracking method as the coal bed cracking method in the step three.
And seventhly, performing gas extraction on the No. 9 coal seam (4) in the same way as the fourth gas extraction method.
And step eight, after all coal seam gas is completely extracted, firstly withdrawing the gas extraction pipe, then releasing pressure and recovering the packers (6 and 7), and finishing the sectional extraction of the No. 9 high gas coal seam (4) and the No. 14 and No. 13 gas-containing coal seams (2 and 3).
Further, in the step one, the diameter of the drill hole (5) is selected to be 91mm, and the diameters of the drill holes such as 75mm and 110mm can be selected according to practical application, and the diameters of the packers (6 and 7) are also selected in a corresponding change mode.
Further, in the third step, the dual-purpose high-pressure pipe (9) is used as a high-pressure hose for injecting back fracturing fluid and an extraction pipe for gas extraction.
Further, in the fourth step, the gas display concentration index at the time of stopping extraction can be correspondingly changed according to the actual production.
Claims (4)
1. A method for realizing gas extraction of a preset coal seam by drilling a gas coal seam through a cross-layer hole is characterized by comprising the following steps:
step one, sequentially penetrating 14 and 13 adjacent coal seams containing gas to 1m above a top plate of a No. 9 coal seam with high gas through upward drill holes with an upward drill inclination angle of 75 degrees by using a drilling machine, wherein the drill holes are 91mm in diameter; after the drilling is finished, the drilling machine is withdrawn;
step two, sealing the upward drilled hole by using a packer with the diameter of 91mm at a position 1m above the No. 13 coal seam top plate and a position 1m below the No. 14 coal seam bottom plate, and pressurizing the packer by using gas or liquid, wherein the packing strength is more than 20MPa, and the drilled hole is sealed;
selecting a dual-purpose high-pressure pipe with the diameter of 30-60 mm according to the enrichment degree of the coal bed gas, connecting the dual-purpose high-pressure pipe with a lower packer, exposing the dual-purpose high-pressure pipe by about 50mm, connecting the dual-purpose high-pressure pipe with a high-pressure pump by adopting a liquid nitrogen foam sand-adding fracturing method, attaching a pressure gauge and a valve to the joint, and injecting high-pressure liquid to fracture coal beds No. 14 and 13, wherein the fracture is in a tree root shape; after fracturing is completed to meet the gas extraction requirement, returning the liquid by the rotary valve for pressure relief, closing the valve after the liquid is returned, and removing the high-pressure pump;
step four, connecting the dual-purpose high-pressure pipe with a gas extraction pipe, arranging a flowmeter and a valve at the connection position, performing pressure relief gas extraction after checking good gas tightness, monitoring the gas concentration of the flowmeter at all times, displaying, closing the valve and stopping gas extraction when the gas extraction concentration of No. 14 and No. 13 coal seams is lower than 0.5%;
step five, releasing pressure of the packers at the coal seams of No. 14 and No. 13, pumping gas or liquid in the packers, conveying the upper packer to a position 1m above the top plate of the coal seam of No. 9, conveying the lower packer to a position 1m below the bottom plate of the coal seam of No. 9, and pressurizing and sealing holes;
sixthly, performing the coal bed No. 9 by adopting the same coal bed cracking method as the coal bed cracking method in the third step;
seventhly, performing gas extraction on the No. 9 coal seam in the same way as the fourth gas extraction method;
and step eight, after all coal seam gas is completely extracted, firstly withdrawing the gas extraction pipe, then releasing pressure and recovering the packer, and finishing the sectional extraction of the No. 9 high gas coal seam, the No. 14 coal seam and the No. 13 coal seam containing the gas.
2. Further, in the step one, the diameter of the drill hole is selected to be 91mm, and the diameter of the packer can be selected according to the actual diameter of the drill hole such as 75mm, 110mm and the like, and the diameter of the packer is also selected in a corresponding change mode.
3. Further, in the third step, the dual-purpose high-pressure pipe is used as a high-pressure hose for injecting back fracturing fluid and an extraction pipe for gas extraction.
4. Further, in the fourth step, the gas display concentration index at the time of stopping extraction can be changed correspondingly according to actual production.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210068786.5A CN114482932B (en) | 2022-01-21 | 2022-01-21 | Method for realizing gas extraction of preset coal seam by penetrating through gas coal seam through-layer drilling |
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| CN202210068786.5A CN114482932B (en) | 2022-01-21 | 2022-01-21 | Method for realizing gas extraction of preset coal seam by penetrating through gas coal seam through-layer drilling |
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| CN114482932B CN114482932B (en) | 2023-05-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879159A (en) * | 2015-06-11 | 2015-09-02 | 河南理工大学 | Gas permeability-increase extraction device and method for soft coal seam stoping face |
| US20170234110A1 (en) * | 2011-06-22 | 2017-08-17 | China Petroleum & Chemical Corporation | Sleeve fracturing assembly, device using the same and method for using the same |
| CN108643877A (en) * | 2018-05-21 | 2018-10-12 | 中国矿业大学 | Coal mine underground coal bed long drilled holes staged fracturing is anti-reflection and mash gas extraction method |
| CN212130542U (en) * | 2020-05-13 | 2020-12-11 | 中国矿业大学 | Non-setting constant-pressure slurry bag hole sealing system for gas extraction drill hole |
| CN112412418A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Freezing fracturing synergistic hydraulic punching permeability-increasing pumping-promoting method for low-permeability coal seam |
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2022
- 2022-01-21 CN CN202210068786.5A patent/CN114482932B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170234110A1 (en) * | 2011-06-22 | 2017-08-17 | China Petroleum & Chemical Corporation | Sleeve fracturing assembly, device using the same and method for using the same |
| CN104879159A (en) * | 2015-06-11 | 2015-09-02 | 河南理工大学 | Gas permeability-increase extraction device and method for soft coal seam stoping face |
| CN108643877A (en) * | 2018-05-21 | 2018-10-12 | 中国矿业大学 | Coal mine underground coal bed long drilled holes staged fracturing is anti-reflection and mash gas extraction method |
| CN212130542U (en) * | 2020-05-13 | 2020-12-11 | 中国矿业大学 | Non-setting constant-pressure slurry bag hole sealing system for gas extraction drill hole |
| CN112412418A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Freezing fracturing synergistic hydraulic punching permeability-increasing pumping-promoting method for low-permeability coal seam |
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