CN110173240A - A kind of coal mine gas drainage method - Google Patents
A kind of coal mine gas drainage method Download PDFInfo
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- CN110173240A CN110173240A CN201910533528.8A CN201910533528A CN110173240A CN 110173240 A CN110173240 A CN 110173240A CN 201910533528 A CN201910533528 A CN 201910533528A CN 110173240 A CN110173240 A CN 110173240A
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- 239000003245 coal Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 35
- 238000005065 mining Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000605 extraction Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims abstract description 7
- 230000008023 solidification Effects 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000004568 cement Substances 0.000 claims description 30
- 239000002002 slurry Substances 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 34
- 238000010586 diagram Methods 0.000 description 5
- 239000002817 coal dust Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
-
- 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Earth Drilling (AREA)
Abstract
The present invention discloses a kind of coal mine gas drainage method, includes the following steps: S01, drilling well: using construction seam roof as the destination layer of gas drainage, carrying out drilling well at the position roof 2-6m and forms horizontal wellbore；S02, complete well solidification: perforating and fracturing: S03 carries out pressure break using staged fracturing mode；Gas mining: S04 is carried out extraction by the way of water pumping gas production, and carries out mining, oil pipe draining using coal bed gas screw pump, casing produces gas, realizes the methane gas collected in construction coal seam to gas mining.Gas drainage of the present invention is able to maintain high yield, stable yields, improves extraction efficiency.
Description
Technical field
The present invention relates to Coal-seam Gas Recovery Technologies field, specifically a kind of coal mine gas drainage method.
Background technique
Gas, also referred to as coal bed gas refer to and are stored in coal seam using methane as main component, to be adsorbed on matrix of coal particle table
Based on face, partially it is free in coal hole or is dissolved in hydrocarbon gas in coal seam water, is the associated minerals resource of coal, belongs to very
Natural gas is advised, is cleaning, high-grade energy and the industrial chemicals to emerge in the world in nearly ten or twenty year, is commonly called as " gas ".Gas is empty
When gas concentration reaches 5%-16%, meeting open fire will explode, this is the root of Gas Explosion Accidents in Coal Mines.Before coal mining if
First mash gas extraction, coal mine gas from explosion rate will reduce by 70% to 85%, therefore country be made that gaseous mine first take out adopt afterwards, gas
Administer preferential requirement.
The extraction development scheme of China's gas has straight well, well caving completion, cluster well, multilateral well, U-shaped well and L-type horizontal
Well etc., it is now recognized that most economical effectively L-type horizontal well and by the way of casing cementing, the complete well of staged fracturing.Tradition
Fracturing process be not appropriate for deformation coal, it is a large amount of it was verified that being difficult to obtain using the complete well of conventional method and pressure break effective
The economic exploitation；The method of traditional hydraulic fracturing squeezes into coal seam using by drilling well, and formation is communicated with ground in coal seam
Horizontal well, is then perfused highly pressurised liquid into horizontal well, and highly pressurised liquid is infused from the side plate of the fracturing string of horizontal well into coal seam
Enter, liquid flow direction to the vertical direction of horizontal well to penetrate into and by coal bed fracturing.Such pressure break mode pressure break heel row in coal seam
The problems such as coal dust and the fracturing sand that spues can largely be gone out during adopting, easily cause coal dust blocking and holddown, yield is therefore by pole
It is big to influence, it is difficult to obtain high yield air-flow.Horizontal well in coal seam since coal seam is easily collapsed so that creep into difficulty, difficult Cheng Jing, accident
Frequently.
Summary of the invention
Present invention aim to address above-mentioned deficiencies, provide a kind of coal mine gas drainage method.
To achieve the above object, the technical solution of the invention is as follows: a kind of coal mine gas drainage method, including walks as follows
It is rapid:
S01, drilling well: will construction seam roof as the destination layer of gas drainage, at the position roof 2-6m into
Row drilling well forms horizontal wellbore；
Drilling well described in the step S01, using segmentation drilling well, specifically as follows:
S01-1, straight well section drilling well: an exploitation is drilled into 20m under bedrock surface, tripping in Φ 244.5mm table with Φ 311.1mm drill bit
Layer casing, cementing slurry return to ground；Two, which open horizontal segment, is drilled into design well depth finishing drilling, tripping in Φ using Φ 215.9mm drill bit
139.7mm production casing, cementing slurry return to well head；
S01-2, net horizontal section drilling well: an exploitation is drilled into 20m under bedrock surface, tripping in Φ 339.7mm with Φ 444.5mm drill bit
Surface pipe, well cementation, which are waited, coagulates, and cement slurry returns to ground；Two exploitations are drilled into landing point, tripping in Φ with Φ 311.1mm drill bit
Well cementation is waited solidifying after 244.5mm protective casing, and cement slurry returns to well head；Three, which open horizontal segment, is drilled into design using Φ 215.9mm drill bit
Well depth finishing drilling is cemented the well after tripping in Φ 139.7mm production casing, and cement slurry returns to 400 meters of upper layer casing；
S02, complete well solidification: complete well solidification carries out as follows:
S02-1, surface pipe well cementation: surface layer uses the scheme of the full sealing of interpolation method, it is ensured that the envelope at well head and casing shoe
Stereoplasm amount, cement slurry density 1.85g/cm3；Presetting period > 60min, environmental condition are 20 DEG C × 0.1MPa；Cement slurry does 24
Hour compressive strength test, compression strength > 3.5MPa；
Intermediate casing cementing: horizontal well technology casing cementing: S02-2 uses the full sealing well of a cement injection, cement slurry
Density 1.85-1.9g/cm3 returns to ground；Horizontal well drilling liner cementing: the full well sealing well shaft fixing technology of a cementing, density are used
1.90 ± 0.02g/cm3, which is returned, is deep to the coal seam top above 300m in circle；
S02-3, the complete well production casing well cementation of straight well: using the full sealing well shaft fixing technology of a conventional cementing, cement slurry is returned
To well head, cement slurry density is 1.90 ± 0.02g/cm3；
Perforating and fracturing: S03 carries out pressure break using staged fracturing mode；
Gas mining: S04 is carried out extraction by the way of water pumping gas production, and carries out mining, oil using coal bed gas screw pump
Pipe draining, casing produce gas, realize the methane gas collected in construction coal seam to gas mining.
Further, staged fracturing mode described in step S03, as follows:
S03-1, perforating and fracturing number of segment determine: the staged fracturing is controlled using perforated interval in 80-100m；
Pressure break: S03-2 carries out pressure break using staged fracturing mode, fractured horizontal well scheme is penetrated using oil pipe dragging sandblasting
Clear water after the completion of abrasive perforating, is infused by oil pipe, the oil jacket of annular injection mulling liquid is with mode is infused, using oily after press one section in hole
Then pipe pressure release above mentions fracturing string to next section, set packer carries out next section of pressure break；Straight well uses light casing pressure
Split technique.
The present invention has following advantageous effects:
1, pressure break is able to maintain the original fracture in coal seam, facilitates the subsequent exploitation to coal seam；Pressure break is carried out in top plate,
The coal dust of generation is less, is not easy to plug pit shaft；
2, drilling well is carried out in roof, Roof rock feature is generally Sandy Silt, packsand, sandstone, has good
Horizontal wellbore stability, low drilling well and well cementation risk, while Horizontal Well Drilling is carried out into avoiding drilling fluid to coal seam in top plate
Pollution；
3, during mining, sand grains, coal dust, which are difficult to migrate upwards under gravity, enters fissure channel and pit shaft,
Be conducive to coal bed gas later development management；
4, gas drainage is able to maintain high yield, stable yields, improves extraction efficiency.
Detailed description of the invention
Fig. 1 is the extraction schematic diagram in the present invention.
Fig. 2 is the straight well section drilling well schematic diagram in the present invention.
Fig. 3 is the net horizontal section drilling well schematic diagram in the present invention.
Fig. 4 is that the screw pump ground in the present invention drives schematic diagram.
Fig. 5 is that the mining in the present invention collects schematic diagram.
Specific embodiment
The present invention provides a kind of coal mine gas drainage method, in order to enable those skilled in the art better understands the present invention
Technical solution, and keep above-mentioned purpose of the invention, feature and advantage definitely understandable, below by embodiment to the present invention
Further instruction, it is intended to be specifically described the present invention, and be not considered as limiting the invention.
As shown in Figure 1, a kind of coal mine gas drainage method, includes the following steps:
S01, drilling well: will construction seam roof as the destination layer of gas drainage, at the position roof 2-6m into
Row drilling well forms horizontal wellbore；
Drilling well described in the step S01, using segmentation drilling well, specifically as follows:
S01-1, straight well section drilling well a: as shown in Fig. 2, exploitation is drilled into 20m under bedrock surface, tripping in Φ 311.1mm drill bit
Φ 244.5mm surface pipe, cementing slurry return to ground；Two, which open horizontal segment, is drilled into design well depth using Φ 215.9mm drill bit
Finishing drilling, tripping in Φ 139.7mm production casing, cementing slurry return to well head；
S01-2, net horizontal section drilling well: as shown in figure 3, an exploitation is drilled into 20m under bedrock surface with Φ 444.5mm drill bit, under
Enter Φ 339.7mm surface pipe, cement the well to wait and coagulate, cement slurry returns to ground；Two exploitations are drilled into landing point with Φ 311.1mm drill bit,
Well cementation is waited solidifying after tripping in Φ 244.5mm protective casing, and cement slurry returns to well head；Three open horizontal segment is bored using Φ 215.9mm drill bit
To design well depth finishing drilling, cement the well after tripping in Φ 139.7mm production casing, cement slurry returns to 400 meters of upper layer casing；
S02, complete well solidification: complete well solidification carries out as follows:
S02-1, surface pipe well cementation: surface layer uses the scheme of the full sealing of interpolation method, it is ensured that the envelope at well head and casing shoe
Stereoplasm amount, cement slurry density 1.85g/cm3；Presetting period > 60min, environment are 20 DEG C × 0.1MPa；Cement slurry is done 24 hours
Compressive strength test, compression strength > 3.5MPa；
Intermediate casing cementing: horizontal well technology casing cementing: S02-2 uses the full sealing well of a cement injection, cement slurry
Density 1.85-1.9g/cm3 returns to ground；Horizontal well drilling liner cementing: the full well sealing well shaft fixing technology of a cementing, density are used
1.90 ± 0.02g/cm3, which is returned, is deep to the coal seam top above 300m in circle；
S02-3, the complete well production casing well cementation of straight well: using the full sealing well shaft fixing technology of a conventional cementing, cement slurry is returned
To well head, cement slurry density is 1.90 ± 0.02g/cm3；
Perforating and fracturing: S03 carries out pressure break using staged fracturing mode；
Gas mining: S04 as shown in figure 4, carrying out extraction by the way of water pumping gas production, and utilizes coal bed gas screw pump
Mining, oil pipe draining are carried out, casing produces gas, realizes to gas mining, as shown in figure 5, collecting the methane gas in construction coal seam.
Specifically, staged fracturing mode described in step S03, as follows:
S03-1, perforating and fracturing number of segment determine: the staged fracturing is controlled using perforated interval in 80-100m；
Pressure break: S03-2 carries out pressure break using staged fracturing mode, fractured horizontal well scheme is penetrated using oil pipe dragging sandblasting
Clear water after the completion of abrasive perforating, is infused by oil pipe, the oil jacket of annular injection mulling liquid is with mode is infused, using oily after press one section in hole
Then pipe pressure release above mentions fracturing string to next section, set packer carries out next section of pressure break；Straight well uses light casing pressure
Split technique.
Claims (2)
1. a kind of coal mine gas drainage method, characterized by the following steps:
Drilling well: S01 using construction seam roof as the destination layer of gas drainage, is bored at the position roof 2-6m
Well forms horizontal wellbore；
Drilling well described in the step S01, using segmentation drilling well, specifically as follows:
S01-1, straight well section drilling well: an exploitation is drilled into 20m under bedrock surface, the tripping in surface layer Φ 244.5mm set with Φ 311.1mm drill bit
Pipe, cementing slurry return to ground；Two, which open horizontal segment, is drilled into design well depth finishing drilling, tripping in Φ using Φ 215.9mm drill bit
139.7mm production casing, cementing slurry return to well head；
S01-2, net horizontal section drilling well: an exploitation is drilled into 20m under bedrock surface, the surface layer tripping in Φ 339.7mm with Φ 444.5mm drill bit
Casing, well cementation, which are waited, coagulates, and cement slurry returns to ground；Two exploitations are drilled into landing point, tripping in Φ 244.5mm skill with Φ 311.1mm drill bit
Well cementation is waited solidifying after art casing, and cement slurry returns to well head；Three, which open horizontal segment, is drilled into design well depth finishing drilling using Φ 215.9mm drill bit,
It cements the well after tripping in Φ 139.7mm production casing, cement slurry returns to 400 meters of upper layer casing；
S02, complete well solidification: complete well solidification carries out as follows:
S02-1, surface pipe well cementation: surface layer uses the scheme of the full sealing of interpolation method, it is ensured that the sealing matter at well head and casing shoe
Amount, cement slurry density 1.85g/cm3；Presetting period > 60min, environmental condition are 20 DEG C × 0.1MPa；Cement slurry is done 24 hours
Compressive strength test, compression strength > 3.5MPa；
Intermediate casing cementing: horizontal well technology casing cementing: S02-2 uses the full sealing well of a cement injection, cement slurry density
1.85-1.9g/cm3 returning to ground；Horizontal well drilling liner cementing: the full well sealing well shaft fixing technology of a cementing, density 1.90 are used
± 0.02g/cm3, which is returned, is deep to the coal seam top above 300m in circle；
S02-3, the complete well production casing well cementation of straight well: using the full sealing well shaft fixing technology of a conventional cementing, cement slurry returns to well
Mouthful, cement slurry density is 1.90 ± 0.02g/cm3；
Perforating and fracturing: S03 carries out pressure break using staged fracturing mode；
Gas mining: S04 is carried out extraction by the way of water pumping gas production, and carries out mining, oil pipe row using coal bed gas screw pump
Water, casing produce gas, realize the methane gas collected in construction coal seam to gas mining.
2. a kind of coal mine gas drainage method as described in claim 1, it is characterised in that: staged fracturing described in step S03
Mode, as follows:
S03-1, perforating and fracturing number of segment determine: the staged fracturing is controlled using perforated interval in 80-100m；
Pressure break: S03-2 carries out pressure break using staged fracturing mode, fractured horizontal well scheme drags abrasive perforating, spray using oil pipe
After the completion of sand perforation, clear water is infused by oil pipe, the oil jacket of annular injection mulling liquid is let out after having pressed one section using oil pipe with mode is infused
Then pressure above mentions fracturing string to next section, set packer carries out next section of pressure break；Straight well uses light casing fracturing work
Skill.
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Cited By (7)
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| CN110886594A (en) * | 2019-12-17 | 2020-03-17 | 中国煤炭地质总局勘查研究总院 | Method for exploiting coal bed gas |
| CN111535848A (en) * | 2020-05-09 | 2020-08-14 | 中煤科工集团西安研究院有限公司 | Broken soft coal seam horizontal well air coal-drawing roadway filling support gas extraction outburst elimination method |
| CN112211595A (en) * | 2020-10-20 | 2021-01-12 | 吕梁学院 | Construction method of coal-bed gas well at critical position |
| CN112302578A (en) * | 2020-10-30 | 2021-02-02 | 中国矿业大学 | Method for exploiting structural coal bed gas by horizontal well stress release |
| CN112878973A (en) * | 2021-01-22 | 2021-06-01 | 中国矿业大学 | Shale reservoir methane in-situ multistage pulse energy-gathering blasting fracturing method |
| CN115331532A (en) * | 2022-08-31 | 2022-11-11 | 四川省煤田地质工程勘察设计研究院 | Multi-coal-seam multi-horizontal three-dimensional development model for coal mine gas and coal rock gas |
| CN115324544A (en) * | 2021-05-10 | 2022-11-11 | 中国石油天然气股份有限公司 | Well completion method for four-well-body structure of super heavy oil reservoir SAGD horizontal production well |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110886594A (en) * | 2019-12-17 | 2020-03-17 | 中国煤炭地质总局勘查研究总院 | Method for exploiting coal bed gas |
| CN110886594B (en) * | 2019-12-17 | 2022-04-01 | 中国煤炭地质总局勘查研究总院 | Method for exploiting coal bed gas |
| CN111535848A (en) * | 2020-05-09 | 2020-08-14 | 中煤科工集团西安研究院有限公司 | Broken soft coal seam horizontal well air coal-drawing roadway filling support gas extraction outburst elimination method |
| CN112211595A (en) * | 2020-10-20 | 2021-01-12 | 吕梁学院 | Construction method of coal-bed gas well at critical position |
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| CN112878973A (en) * | 2021-01-22 | 2021-06-01 | 中国矿业大学 | Shale reservoir methane in-situ multistage pulse energy-gathering blasting fracturing method |
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| CN115324544B (en) * | 2021-05-10 | 2024-05-28 | 中国石油天然气股份有限公司 | Completion method of four-well structure of SAGD horizontal production well of super heavy oil reservoir |
| CN115331532A (en) * | 2022-08-31 | 2022-11-11 | 四川省煤田地质工程勘察设计研究院 | Multi-coal-seam multi-horizontal three-dimensional development model for coal mine gas and coal rock gas |
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