CN114482932B - Method for realizing gas extraction of preset coal seam by penetrating through gas coal seam through-layer drilling - Google Patents
Method for realizing gas extraction of preset coal seam by penetrating through gas coal seam through-layer drilling Download PDFInfo
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- CN114482932B CN114482932B CN202210068786.5A CN202210068786A CN114482932B CN 114482932 B CN114482932 B CN 114482932B CN 202210068786 A CN202210068786 A CN 202210068786A CN 114482932 B CN114482932 B CN 114482932B
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- 239000003245 coal Substances 0.000 title claims abstract description 125
- 238000000605 extraction Methods 0.000 title claims abstract description 80
- 238000005553 drilling Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000000149 penetrating effect Effects 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 113
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 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
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 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
- 238000005336 cracking Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002002 slurry 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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Abstract
The invention discloses a method for realizing gas extraction of a preset coal seam by penetrating and drilling a gas coal seam, aiming at carrying out high-efficiency gas extraction on coal seams 14, 13 and 9 in two sections by upwards penetrating and drilling a mined coal seam 15 through a coal seam containing gas 14, 13 and a high-gas coal seam 9. The method mainly comprises the following steps: drilling holes by using a drilling machine, sealing holes of the No. 14 and No. 13 coal beds by using an upper packer and a lower packer, fracturing the No. 14 and No. 13 coal beds by adding sand into liquid nitrogen foam, releasing the sealing holes of the No. 14 and No. 13 coal beds by using the packer, sealing holes of the No. 14 and No. 13 high-gas coal beds by using the upper packer and the lower packer, fracturing the No. 9 coal beds by adding sand into the liquid nitrogen foam, and releasing the gas of the No. 9 coal beds by using the pressure and the gas of the No. 9 coal beds by using the pressure-releasing pump. The invention can realize the gas sectional extraction of multiple coal beds in the coal mine, improves the gas extraction effect of the coal mine, improves the gas extraction rate, ensures the safe production of the coal mine, avoids the resource waste and realizes the safety and high efficiency of the gas extraction of the coal mine.
Description
Technical Field
The invention mainly relates to the field of underground coal mine gas extraction, in particular to a method for realizing gas extraction of a preset coal seam by penetrating through a layer of holes and passing through a gas coal seam.
Background
At present, the overall gas extraction effect of the coal mine in China is poor, the gas extraction rate is low, the coal mine safety production is not facilitated, and a large amount of resources are wasted. The extraction rate of key coal mines in China in 2020 is only about 40%, and the reasons for low gas extraction rate of coal mines in China come from two aspects: on one hand, the method is an objective reason, the coal seam has low air permeability, the coal seam is softer, the gas extraction difficulty is high, and the extraction effect is seriously affected; on the other hand, the method is subjective and mainly shows that the extraction time is short, the drilling engineering quantity is insufficient, the hole sealing quality is poor, the extraction method is single, and the extraction system is not matched and is not managed in place.
According to the invention, multi-section coal seam gas can be drilled and extracted in the underground coal mine, the coal seam gas permeability 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 ensured to be reduced, the working procedure is simplified, and the efficient coal mine gas extraction is realized.
Disclosure of Invention
Aiming at the problems of poor gas extraction effect, low gas extraction rate, influence on the safe production of a coal mine, resource waste and the like of the coal mine, the invention provides a method for realizing the gas extraction of a preset coal seam by penetrating a layer and drilling a gas coal seam, which aims at improving the gas extraction effect of the coal mine, improving the gas extraction rate, ensuring the safe production of the coal mine, avoiding the resource waste and realizing the efficient implementation of the gas extraction of the coal mine.
In order to achieve the above 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 penetrating and drilling through a gas coal seam, which aims to upwards penetrate and drill through a mined No. 15 coal seam from a coal seam containing gas 14 and No. 13 to a high-gas No. 9 coal seam, and carry out high-efficiency extraction of gas of the No. 14, no. 13 and No. 9 coal seams in two sections; mainly comprises the following steps: drilling holes by using a drilling machine, sealing holes of the No. 14 and No. 13 coal beds by using an upper packer and a lower packer, fracturing the No. 14 and No. 13 coal beds by adding sand into liquid nitrogen foam, releasing the sealing holes of the No. 14 and No. 13 coal beds by using the packer, sealing holes of the No. 14 and No. 13 high-gas coal beds by using the upper packer and the lower packer, fracturing the No. 9 coal beds by adding sand into the liquid nitrogen foam, and releasing the gas of the No. 9 coal beds by using the pressure and the gas of the No. 9 coal beds by using the pressure-releasing pump.
A method for realizing gas extraction of a preset coal bed by penetrating through a drill hole of the coal bed is characterized by comprising the following steps:
step one, upward drilling holes with the upward drilling inclination angle of 75 degrees sequentially penetrate through adjacent coal beds containing gas No. 14 and No. 13 to a position 1m above a No. 9 coal bed top plate with high gas, the drilling hole diameter is 91mm, and after the drilling holes are completed, the drilling machine is retracted.
And secondly, sealing the upward drilling holes at the position 1m above the No. 13 coal seam roof and the position 1m below the No. 14 coal seam floor by using a packer with the diameter of 91mm, pressurizing the packer by using liquid, and sealing the drilling holes with the sealing strength reaching more than 20 MPa.
And thirdly, selecting a dual-purpose high-pressure pipe with the diameter of 30-60 mm according to the coalbed methane concentration degree, connecting the dual-purpose high-pressure pipe with a lower packer, exposing the dual-purpose high-pressure pipe for about 50mm, connecting the dual-purpose high-pressure pipe with a high-pressure pump by adopting a liquid nitrogen foam sand-adding flushing method, installing a pressure gauge and a valve at the joint, injecting high-pressure liquid to fracture the No. 14 and No. 13 coalbeds, enabling cracks to be tree root-shaped, returning the liquid by a rotary valve to relieve pressure after fracturing until the methane extraction requirement is met, and closing the valve after the liquid return is finished, and removing the high-pressure pump.
And fourthly, connecting the dual-purpose high-pressure pipe with a gas extraction pipe, arranging a flowmeter and a valve at the joint, performing pressure relief extraction after checking that the air tightness is good, monitoring the concentration of the gas of the flowmeter at any time, and closing the valve when the concentration of the gas extraction of the No. 14 and No. 13 coal seams is lower than 0.5%, and stopping extraction.
And fifthly, releasing pressure of the packer at the positions of the No. 14 and the No. 13 coal beds, pumping back liquid in the packer, conveying the upper packer to the position 1m above the roof of the No. 9 coal bed, conveying the lower packer to the position 1m below the floor of the No. 9 coal bed, and pressurizing and sealing holes.
And step six, carrying out impulse fracture on the No. 9 coal seam, which is the same as the impulse fracture method of the step three.
And step seven, carrying out gas extraction on the No. 9 coal bed in the same way as the four-gas extraction method.
Step eight, after all coal seam gas is extracted, firstly recovering the gas extraction pipe, and then releasing pressure and recovering the packer; and the sectional extraction of the No. 9 high-gas coal seam and the No. 14 and 13 gas-containing coal seam is completed.
Further, in the first step, the diameter of the drilled hole is selected to be 91mm, and the diameters of the drilled holes such as 75mm, 110mm and the like can be selected according to the actual conditions, and the diameter of the packer is also selected correspondingly.
Further, in the third step, the dual-purpose high-pressure pipe is used as a high-pressure hose for injecting back fracturing fluid and as a gas extraction pipe during gas extraction.
Further, in the fourth step, the gas display concentration index at the time of stopping extraction may be changed correspondingly according to the actual production.
The invention has the beneficial effects that: the packer is used for sealing the upward drilling hole skillfully, can be effectively recycled, and can avoid time and labor consumption for sealing the side wall of the fractured coal seam by cement slurry after gas extraction; the liquid nitrogen sand-adding flushing method is adopted, so that the permeability of the coal seam 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 in fracturing and can be used as a gas extraction pipe, space waste caused by the fact that the high-pressure hose is arranged and the gas extraction pipe is avoided, manpower and material resources are saved, and the gas extraction efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a method for extracting gas from a coal seam containing gas by means of through-layer drilling.
Fig. 2 is a schematic drawing of the extraction of the No. 13 and No. 14 coal seams in a method for extracting gas from the coal seam containing gas through the through-layer drilling holes to realize the extraction of the gas from the preset coal seam.
In the figure: (1) a mined coal seam No. 15; (2) a coal seam containing gas No. 14; (3) a coal seam containing gas No. 13; (4) a high gas coal seam No. 9; (5) upward drilling; (6) an upper packer; (7) a lower packer; (8) a packer liquid injection pipe; (9) a dual-purpose high-pressure pipe; (10) is a valve; (11) is a high-pressure pump for a packer; (12) is a rock formation.
Detailed Description
The method of the present invention will be described in further detail with reference to the following detailed description of the drawings.
The invention provides a method for realizing gas extraction of a preset coal seam by penetrating through a layer and drilling a gas coal seam, which comprises the following steps:
step one, using a drilling machine to upwards drill an upward drilling hole (5) with an inclination angle of 75 degrees, sequentially penetrating through a No. 14 coal seam (2) containing gas and a No. 13 coal seam (3) containing gas to a position 1m above a top plate of a No. 9 coal seam (4) containing high gas, wherein the diameter of the drilling hole (5) is 91mm, and after the drilling hole is completed, retracting the drilling machine.
Step two, sealing the upward drilling holes (5) at the position 1m above the top plate of the No. 13 coal bed (3) and the position 1m below the bottom plate of the No. 14 coal bed (2) by using packers (6 and 7) with the diameter of 91mm, pressurizing the packers (6 and 7) by using liquid, and sealing the drilling holes (5) with the sealing strength of more than 20 MPa.
Step three, selecting a dual-purpose high-pressure pipe (9) with the diameter of 30-60 mm according to the enrichment degree of coal seam 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; the method comprises the steps of connecting a dual-purpose high-pressure pipe (9) with a high-pressure pump by adopting a liquid nitrogen foam sand-adding flushing method, attaching a pressure gauge and a valve (10) at the joint, injecting high-pressure liquid to fracture No. 14 and No. 13 coal seams (2 and 3), wherein the cracks are tree root-shaped; after fracturing until the requirement of gas extraction is met, the rotary valve (10) returns liquid for pressure relief, after liquid return is completed, the valve (10) is closed, and the high-pressure pump is removed.
And fourthly, 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 extraction after checking that the air tightness is good, monitoring the concentration of the gas of the flowmeter at all times, and closing the valve when the concentration of the gas extraction of the No. 14 and No. 13 coal beds (2 and No. 3) is lower than 0.5%, and stopping extraction.
And fifthly, releasing pressure of the packers (6, 7) at the coal beds (2, 3) of the No. 14 and the No. 13, pumping back gas or liquid in the packers (6, 7), conveying the upper packer (6) to the position 1m above the top plate of the coal bed (4) of the No. 9, and conveying the lower packer (7) to the position 1m below the bottom plate of the coal bed (4) of the No. 9, and pressurizing and sealing holes.
And step six, the same as the coal seam flushing and fracturing method in the step three, flushing and fracturing the No. 9 coal seam (4).
And step seven, carrying out gas extraction on the No. 9 coal seam (4) in the same way as the four-gas extraction method.
And step eight, after all coal seam gas is extracted, firstly recovering the gas extraction pipe, then releasing pressure and recovering the packers (6 and 7), and completing the sectional extraction of the No. 9 high gas coal seam (4), the No. 14 and the No. 13 gas coal seam (2 and 3).
In the first step, the diameter of the drilling hole (5) is selected to be 91mm, and the diameters of the packer (6, 7) are also selected correspondingly according to the actual drilling hole diameters of 75mm, 110mm and the like.
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 also used as a gas extraction pipe during gas extraction.
Further, in the fourth step, the gas display concentration index at the time of stopping extraction may be changed correspondingly according to the actual production.
Claims (4)
1. A method for realizing gas extraction of a preset coal bed by penetrating through a drill hole of the coal bed is characterized by comprising the following steps:
step one, upward drilling holes with the upward drilling inclination angle of 75 degrees sequentially penetrate through adjacent coal beds containing gas No. 14 and No. 13 to a position 1m above a No. 9 coal bed top plate of high gas, wherein the diameter of each hole is 91mm; after the drilling is completed, the drilling machine is retracted;
step two, sealing the upward drilling holes by using a packer with the diameter of 91mm at the position 1m above the No. 13 coal seam roof and the position 1m below the No. 14 coal seam floor, and pressurizing the packer by using gas or liquid, wherein the sealing strength is more than 20MPa, and sealing the drilling holes;
selecting a dual-purpose high-pressure pipe with the diameter of 30-60 mm according to the enrichment degree of coal seam gas, connecting the dual-purpose high-pressure pipe with a lower packer, exposing about 50mm, connecting the dual-purpose high-pressure pipe with a high-pressure pump by adopting a liquid nitrogen foam sand-adding flushing method, attaching a pressure gauge and a valve at the joint, injecting high-pressure liquid to fracture No. 14 and No. 13 coal seams, and enabling the cracks to be tree root-shaped; after fracturing until the requirement of gas extraction is met, returning liquid and releasing pressure by a rotary valve, closing the valve after the liquid returning is completed, and removing the high-pressure pump;
step four, connecting a dual-purpose high-pressure pipe with a gas extraction pipe, arranging a flowmeter and a valve at the joint, performing pressure relief extraction after checking that the air tightness is good, monitoring the concentration of the gas of the flowmeter at any time, and closing the valve when the concentration of the gas extraction of the No. 14 and No. 13 coal seams is lower than 0.5%, and stopping extraction;
step five, releasing pressure of the packer at the positions of the No. 14 and the No. 13 coal beds, pumping back gas or liquid in the packer, conveying the upper packer to the position 1m above the roof of the No. 9 coal bed, conveying the lower packer to the position 1m below the floor of the No. 9 coal bed, and pressurizing and sealing holes;
step six, the same as the coal seam flushing and cracking method in the step three, the coal seam 9 is flushed and cracked;
step seven, carrying out gas extraction on the No. 9 coal bed in the same way as the step four gas extraction method;
step eight, after all coal seam gas is extracted, firstly recovering the gas extraction pipe, and then releasing pressure and recovering the packer; and the sectional extraction of the No. 9 high-gas coal seam and the No. 14 and 13 gas-containing coal seam is completed.
2. The method for realizing the gas extraction of the preset coal seam through the gas coal seam through the through-layer drilling according to the claim 1, wherein in the first step, the drilling diameter is selected to be not only 91mm, but also 75mm and 110mm according to actual drilling diameters, and the packer diameter is also selected correspondingly.
3. The method for realizing the gas extraction of the preset coal seam through the gas coal seam through the through-layer drilling hole according to claim 1, wherein in the third step, the dual-purpose high-pressure pipe is used as a high-pressure hose for injecting back fracturing fluid and is used as an extraction pipe during gas extraction.
4. The method for realizing the gas extraction of the preset coal seam through the gas coal seam through the through-layer drilling according to the claim 1, wherein in the fourth step, the gas display concentration index at the time of stopping the extraction is correspondingly changed according to the actual production.
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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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Citations (4)
| 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 |
| CN108643877A (en) * | 2018-05-21 | 2018-10-12 | 中国矿业大学 | Coal mine underground coal seam long drilling staged fracturing permeability-increasing and 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2597301C2 (en) * | 2011-06-22 | 2016-09-10 | Чайна Петролеум Энд Кемикл Корпорейшн | Coupling assembly for hydraulic fracturing, device based thereon and method for use thereof |
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Patent Citations (4)
| 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 |
| CN108643877A (en) * | 2018-05-21 | 2018-10-12 | 中国矿业大学 | Coal mine underground coal seam long drilling staged fracturing permeability-increasing and 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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