CN110145293A - A kind of Poly-generation is without well formula coal underground gasification method - Google Patents
A kind of Poly-generation is without well formula coal underground gasification method Download PDFInfo
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- CN110145293A CN110145293A CN201910537465.3A CN201910537465A CN110145293A CN 110145293 A CN110145293 A CN 110145293A CN 201910537465 A CN201910537465 A CN 201910537465A CN 110145293 A CN110145293 A CN 110145293A
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- main borehole
- well
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- gas
- underground
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B35/00—Methods or apparatus for preventing or extinguishing fires
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
Abstract
The invention discloses a kind of Poly-generation without well formula coal underground gasification method, including bore operation, well cementing operation, gas drainage operation, underground coal gasification(UCG) operation, burned out area processing operation, CO2Seal operation up for safekeeping.This Poly-generation can substantially reduce borehole engineering amount without well formula coal underground gasification method, based on single drilling construction process, it can be realized by pumping integrated multipurpose tube assembly and be sequentially completed gas drainage operation, underground coal gasification(UCG) operation, burned out area handles operation, gas seals operation and sealing of hole operation up for safekeeping, greatly improve the utilization rate of drilling, realizing while realizing the underground coal gasification(UCG) operation of Poly-generation reduces production cost, and underground may be implemented and discard spatial reuse, it can effectively overcome prior art drilling utilization rate low, the deficiencies of high production cost, especially suitable for underground coal gasification(UCG) operation.
Description
Technical field
The present invention relates to a kind of coal underground gasification method, specifically a kind of Poly-generation suitable for underground coal mine is without well formula
Coal underground gasification method belongs to Coal Resource Development and utilizes technical field.
Background technique
Underground coal gasification(UCG) is as a kind of exploratory coal ground in-situ fluidization production practice, and there are well formulas, Wu Jing
Two kinds of process for underground gasification of formula form gasification furnace after wherein no-shaft underground gasification process is penetrated through by earth drilling and carry out gas
Change, can be used for recycling manually cannot exploit and exploit uneconomic coal resources.No well formula underground coal gasification(UCG) efficiently passes through
Ji, realizes that underground is unattended, guarantees the safety of production process.But coal is largely bored into due to needing to drill through from ground
Layer simultaneously penetrates through, and borehole engineering amount is big.And a large amount of drillings are used only for coal gasification processes at present, cannot make full use of, cause to bore
Hole utilization rate is low, results in waste of resources.
And hole pumping and mining method has been widely used in the recovery process of the resources gas such as coal bed gas, shale gas at present, it is main
It will be using techniques such as directional drilling, the suctions of deep pressure break.Coal resources complete for some preservations, because of preservation original in coal seam
Bulk gas gasification process, gasification result etc. can be had an impact, before carrying out underground gasification, need original to these first
Gas carries out extraction.After coal gasification processes are completed, underground may cause watt there are still remaining coal and flame range
How effectively this explosion and large underground area fire generate severe compromise, while generating pollution to underground environment, therefore
Extinguish gasification furnace flame range problem than more prominent.Coal is after gasification recycling, it may appear that space is discarded in underground, how using in this way
Space resources be also the problem to be solved such as one.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of Poly-generation without well formula coal underground gasification method, can greatly mention
The underground coal gasification(UCG) operation of Poly-generation is realized under the premise of height drilling utilization rate, and then realizes reduction production cost, Er Qieke
To realize that spatial reuse is discarded in underground, especially suitable for underground coal gasification(UCG) operation.
To achieve the above object, this Poly-generation without well formula coal underground gasification method specifically includes the following steps:
A) bore operation: directional drilling technique is used first, the direction from ground to coal seam tilts from back to front constructs out
Two inclined drills, two inclined drills are crept into coal seam respectively, creep into set distance forward along bearing continuation respectively
Two coal seam drilling hole sections are formed, two inclined drills and two coal seam drilling hole sections are respectively formed continuous main borehole I and main borehole
II, main borehole I and main borehole II are then based respectively in the coal seam between main borehole I and main borehole II, every set distance
It constructs out multiple blind hole structure branch holes in pinniform；
B) well cementing operation: casing is installed in main borehole I and main borehole II, fitting limit is from earth's surface to main borehole end hole
Place, wherein casing of the earth's surface to before entering coal seam uses screen casing using seamless casing, into the casing after coal seam；Then exist
Earth's surface installs pumping integrated multipurpose tube assembly in the casing to before entering coal seam；Pumping integrated multipurpose tube assembly packet
Extraction integration pipe and injection hole sealing dedicated pipe are included, the bottom end of extraction integration pipe passes through high temperature resistant baffle I and passes through high temperature resistant
The positioning of baffle I is erected in casing, and the bottom end of extraction integration pipe is equipped with gas collecting end, and gas collecting end is equipped with more
The gas collecting through-hole of a perforation, the bottom end of injection hole sealing dedicated pipe pass through high temperature resistant baffle II and pass through high temperature resistant baffle II
Positioning is erected on extraction integration pipe, and the bottom end of injection hole sealing dedicated pipe is located at high temperature resistant baffle I and high temperature resistant baffle II
Between；Grout injection carries out solid pipe between casing and hole wall, and grout injection makes extraction integration pipe and note in casing
Slurry sealing of hole dedicated pipe is closed and is located in casing, keeps off finally by injection hole sealing dedicated pipe in high temperature resistant baffle I and high temperature resistant
Space between plate II fills plugging material；
C) gas drainage operation: on ground that gas drainage pump is integrated with the extraction in main borehole I and main borehole II respectively
Change the earth's surface end interface connection of pipe, starting gas drainage pump passes through main borehole I, main borehole II and each branch hole extraction coal seam
Gas；
D) underground coal gasification(UCG) operation: after completing gas drainage operation, regarding main borehole I or main borehole II as inlet well,
It regard main borehole II or main borehole I as outlet well, the earth's surface right above inlet well borehole bottom location is constructed perpendicular to earth drilling
It is drilled into the ignition well of inlet well borehole bottom location out and carries out cement operations, it is then that gas injection pump is integrated with the extraction of inlet well
The earth's surface end interface connection of pipe connects the earth's surface end interface of aspiration pump pipe integrated with the extraction of outlet well, to ignition well into
Starting gas injection pump and aspiration pump while row igniting, the borehole bottom location of main borehole I and main borehole II is made using firepower perforation principle
It is formed through coal underground gasifying furnace, gasifying agent is sent by setting flow to coal underground gasifying furnace by inlet well, gasification produces
Object extracts ground out by outlet well；It burns and is retracted to the setting for being located at coal seam drilling hole section rear end to gasification furnace working face and stop adopting line position
It postpones, completes underground coal gasification(UCG) operation；
E) burned out area handles operation: by the earth's surface of charge pump pipe integrated with the extraction of main borehole I and main borehole II respectively
End interface connection, while remover, cleanser, extinguishing chemical are injected into burned out area by main borehole I and main borehole II；
f)CO2It seals operation up for safekeeping: the earth's surface that gas injection pumps pipe integrated with the extraction of main borehole I and main borehole II respectively is terminated
Mouth connection, while CO is injected into burned out area by main borehole I and main borehole II2Gas, finally block inlet well, outlet well and
Ignition well is to CO2Gas is sealed up for safekeeping.
As a further improvement of the present invention, in step c), as CH in gas bleeding4Stopping when concentration is down to 30%
Gas drainage utilizes and continues for extraction, to CH4After concentration is down to 9% or less and continual and steady setting time, gas is completed
Extraction operation.
As a further improvement of the present invention, two coal seam drilling hole sections are arranged in parallel in step a).
As a further improvement of the present invention, branch hole favours bearing direction forwards and applies in step a)
Work.
As a further improvement of the present invention, the drilling depth of branch hole is 20~40m in step a), and multiple
Spacing between branch hole is 5~10m.
As a preferred solution of the present invention, the space in step b) between injection high temperature resistant baffle I and high temperature resistant baffle II
Plugging material be using high hydroscopic resin as the high water seal of base-material block up fireproofing extinguishing materials.
Compared with prior art, this Poly-generation need to only drill through main borehole I, main borehole II without well formula coal underground gasification method
And ignition well three drillings, therefore borehole engineering amount can be substantially reduced；By pacifying in casing to before entering coal seam in earth's surface
Pumping integrated multipurpose tube assembly is filled, therefore is based on single drilling construction process, pumping integrated multipurpose pipe can be passed through
Component realization is sequentially completed gas drainage operation, underground coal gasification(UCG) operation, burned out area processing operation, gas seal operation and envelope up for safekeeping
Hole operation greatlys improve the utilization rate of drilling, and realizing while realizing the underground coal gasification(UCG) operation of Poly-generation reduces production
Cost, and underground may be implemented and discard spatial reuse, capable of effectively overcoming prior art drilling, utilization rate is low, production cost
The deficiencies of high, especially suitable for underground coal gasification(UCG) operation.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the mounting structure schematic diagram of pumping integrated multipurpose tube assembly of the present invention.
In figure: 1, main borehole I, 2, main borehole II, 3, branch hole, 4, casing, 5, extraction integration pipe, 6, injection hole sealing
Dedicated pipe, 7, high temperature resistant baffle I, 8, high temperature resistant baffle II, 9, ignition well, 10, coal underground gasifying furnace, 11, ground, 12, coal
Layer, 13, stop adopting line.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing (being described below using the left direction of Fig. 1 as front).
As shown in Figure 1, this Poly-generation without well formula coal underground gasification method specifically includes the following steps:
A) bore operation: directional drilling technique is used first, tilts and applies from back to front from ground 11 to the direction in coal seam 12
Work goes out two inclined drills, i.e. inclined drill and the angle between the coal seam 12 in front is arranged in obtuse angle, and such setting can
Convenient for it is subsequent steering drill through coal seam drilling hole section, two inclined drills are crept into respectively to coal seam 12, respectively along coal seam 12 move towards after
The continuous set distance of drilling forward forms two coal seam drilling hole sections, and two inclined drills and two coal seam drilling hole sections are respectively formed continuously
Main borehole I 1 and main borehole II 2, in order to increase the gas permeability in coal seam 12, convenient for improving subsequent gas drainage efficiency, in master
It drills and is based respectively on main borehole I 1 and main borehole II 2 in the coal seam 12 between I 1 and main borehole II 2, construct out every set distance
Multiple blind hole structure branch holes 3 in pinniform.
B) well cementing operation: installing casing 4 in main borehole I 1 and main borehole II 2, and fitting limit is whole from earth's surface to main borehole
At hole, wherein casing 4 of the earth's surface to before entering coal seam uses screen casing using seamless casing, into the casing 4 after coal seam；So
Pumping integrated multipurpose tube assembly is installed in the casing 4 in earth's surface to before entering coal seam afterwards；As shown in Fig. 2, pumping is integrated
Changing multipurpose tube assembly includes extraction integration pipe 5 and injection hole sealing dedicated pipe 6, and the bottom end of extraction integration pipe 5 passes through resistance to height
Warm baffle I 7 is simultaneously erected in casing 4 by the positioning of high temperature resistant baffle I 7, and the bottom end of extraction integration pipe 5 is equipped with gas collecting
End, gas collecting end are equipped with the gas collecting through-hole of multiple perforations, and the bottom end of injection hole sealing dedicated pipe 6 passes through high temperature resistant
Baffle II 8 is simultaneously erected on extraction integration pipe 5 by the positioning of high temperature resistant baffle II 8, and the bottom end of injection hole sealing dedicated pipe 6
Between high temperature resistant baffle I 7 and high temperature resistant baffle II 8；Grout injection carries out solid pipe between casing 4 and hole wall, is covering
Grout injection keeps extraction integration pipe 5 closed with injection hole sealing dedicated pipe 6 and is located in casing 4 in pipe 4, finally by note
It starches space of the sealing of hole dedicated pipe 6 between high temperature resistant baffle I 7 and high temperature resistant baffle II 8 and fills plugging material.
C) gas drainage operation: after the completion of well cementing operation hole to be drilled, ground 11 by gas drainage pump respectively with main borehole I
1 connects with the earth's surface end interface of the extraction integration pipe 5 in main borehole II 2, and starting gas drainage pump passes through main borehole I 1, master
Drill II 2 and 3 draining coal seam gas of each branch hole, as CH in gas bleeding4Concentration stops gas drainage benefit when being down to 30%
With and continue for extraction, to CH4After concentration is down to 9% or less and continual and steady setting time, gas drainage operation is completed.
D) underground coal gasification(UCG) operation: main borehole I 1 or main borehole II 2 are regard as inlet well, by main borehole II 2 or main brill
Hole I 1 is used as outlet well, and the earth's surface right above inlet well borehole bottom location goes out to be drilled into inlet well end perpendicular to 11 drilling construction of ground
The ignition well 9 of hole site simultaneously carries out cement operations, then terminates the earth's surface of gas injection pump pipe 5 integrated with the extraction of inlet well
Mouth connection connects the earth's surface end interface of aspiration pump pipe 5 integrated with the extraction of outlet well, lights a fire to ignition well 9 same
Shi Qidong gas injection pump and aspiration pump are formed through main borehole I 1 and the borehole bottom location of main borehole II 2 using firepower perforation principle
Coal underground gasifying furnace 10 is sent gasifying agent by setting flow to coal underground gasifying furnace 10 by inlet well, gasification product by
Outlet well extracts ground 11 out；It burns and is retracted to the setting for being located at coal seam drilling hole section rear end to gasification furnace working face and stop adopting 13, line
It postpones, stops underground coal gasification(UCG) operation.
E) burned out area handles operation: after the completion of underground coal gasification(UCG) operation, by charge pump respectively with main borehole I 1 and main
Drill II 2 extraction integration pipe 5 the connection of earth's surface end interface, while through main borehole I 1 and main borehole II 2 into burned out area
Remover, cleanser, extinguishing chemical etc. are injected, to eliminate the poisonous and harmful element in burned out area lime-ash and thoroughly extinguishing burned out area height
Warm spot.
f)CO2Seal operation up for safekeeping: after burned out area handle operation after the completion of, by gas injection pump respectively with main borehole I 1 and main borehole II
The earth's surface end interface of 2 extraction integration pipe 5 connects, while CO is injected into burned out area by main borehole I 1 and main borehole II 22
Gas finally blocks inlet well, outlet well and ignition well 9 to CO2Gas is sealed up for safekeeping, and burned out area is made full use of to improve gas envelope
Deposit efficiency.
For the ease of making the borehole bottom location of main borehole I 1 and main borehole II 2 with being formed through coal using firepower perforation principle
Lower gasification furnace 10, as a further improvement of the present invention, two coal seam drilling hole sections are arranged in parallel in step a).
Branch hole 3, as a further improvement of the present invention, step are drilled through for the ease of directional drilling steering operation
A) branch hole 3 favours coal seam 12 forwards and moves towards direction construction in.
In order to increase the gas permeability in coal seam 12, improve the efficiency of gas extraction, the drilling depth of branch hole 3 in step a)
For 20~40m, and the spacing between multiple branch holes 3 is 5~10m.
The plugging material in the space between injection high temperature resistant baffle I 7 and high temperature resistant baffle II 8 can be used with foamed cement
For the foam fireproof plugging material of base-material, it can also use and block up fireproofing extinguishing materials by the high water seal of base-material of high hydroscopic resin, by
Hundreds of to thousands of times of weight itself of water can be absorbed in the latter, and after contact with water can occur in a short time swelling,
Gel is formed after water suction, portion is dehydrated under a certain pressure, has unique high water holding capacity, and performance is much better than traditional closure material
Material, therefore preferred the latter, that is, as a preferred solution of the present invention, injection high temperature resistant baffle I 7 and high temperature resistant baffle in step b)
The plugging material in the space between II 8 is to block up fireproofing extinguishing materials by the high water seal of base-material of high hydroscopic resin.
This Poly-generation can substantially reduce borehole engineering amount without well formula coal underground gasification method, be based on single drilling construction mistake
Journey can be realized by pumping integrated multipurpose tube assembly and be sequentially completed gas drainage operation, underground coal gasification(UCG) operation, combustion
Operation and sealing of hole operation are sealed in Mined-out area disposal operation, gas up for safekeeping, greatly improve the utilization rate of drilling, with realizing the coal of Poly-generation
Realizing while lower gasification operation reduces production cost, and underground may be implemented and discard spatial reuse, can effectively overcome
The prior art drills the deficiencies of utilization rate is low, high production cost, especially suitable for underground coal gasification(UCG) operation.
Claims (6)
1. a kind of Poly-generation is without well formula coal underground gasification method, which is characterized in that specifically includes the following steps:
A) bore operation: directional drilling technique is used first, tilts and applies from back to front from ground (11) to the direction of coal seam (12)
Work goes out two inclined drills, and two inclined drills are crept into respectively to after coal seam (12), moves towards to continue forward along coal seam (12) respectively
It creeps into set distance and forms two coal seam drilling hole sections, two inclined drills and two coal seam drilling hole sections are respectively formed continuous main brill
Hole I (1) and main borehole II (2) are then based respectively on main brill in the coal seam between main borehole I (1) and main borehole II (2) (12)
Hole I (1) and main borehole II (2) are constructed out multiple blind hole structure branch holes (3) in pinniform every set distance；
B) well cementing operation: casing (4) are installed in main borehole I (1) and main borehole II (2), fitting limit is from earth's surface to main borehole
At whole hole, wherein casing (4) of the earth's surface to before entering coal seam is used using seamless casing, into the casing (4) after coal seam
Screen casing；Then pumping integrated multipurpose tube assembly is installed in the casing (4) in earth's surface to before entering coal seam；Pumping integration
Multipurpose tube assembly includes extraction integration pipe (5) and injection hole sealing dedicated pipe (6), and the bottom end of extraction integration pipe (5) passes through
High temperature resistant baffle I (7) is simultaneously erected in casing (4), the bottom end of extraction integration pipe (5) by high temperature resistant baffle I (7) positioning
Equipped with gas collecting end, gas collecting end is equipped with the gas collecting through-hole of multiple perforations, injection hole sealing dedicated pipe (6)
Bottom end passes through high temperature resistant baffle II (8) and is erected on extraction integration pipe (5) by high temperature resistant baffle II (8) positioning, and infuses
The bottom end of sealing of hole dedicated pipe (6) is starched between high temperature resistant baffle I (7) and high temperature resistant baffle II (8)；In casing (4) and hole wall
Between grout injection carry out solid pipe, in casing (4), interior grout injection makes extraction integration pipe (5) and injection hole sealing dedicated pipe
(6) closed and be located in casing (4), finally by injection hole sealing dedicated pipe (6) in high temperature resistant baffle I (7) and high temperature resistant gear
Space between plate II (8) fills plugging material；
C) gas drainage operation: ground (11) by gas drainage pump respectively with main borehole I (1) and main borehole II (2) in pumping
The earth's surface end interface connection of integration pipe (5) is adopted, starting gas drainage pump passes through main borehole I (1), main borehole II (2) He Gefen
Branch drilling (3) draining coal seam gas；
D) underground coal gasification(UCG) operation: after completing gas drainage operation, main borehole I (1) or main borehole II (2) are regard as air inlet
Well regard main borehole II (2) or main borehole I (1) as outlet well, and the earth's surface right above inlet well borehole bottom location is perpendicular to ground
(11) drilling construction goes out to be drilled into the ignition well (9) of inlet well borehole bottom location and carries out cement operations, then by gas injection pump and air inlet
The earth's surface end interface connection of the extraction integration pipe (5) of well, by the earth's surface end of aspiration pump pipe (5) integrated with the extraction of outlet well
Interface connection, starts gas injection pump and aspiration pump while igniting to ignition well (9), make main borehole using firepower perforation principle
The borehole bottom location of I (1) and main borehole II (2) is formed through coal underground gasifying furnace (10), by gasifying agent by inlet well by setting
Constant flow is sent to coal underground gasifying furnace (10), and gasification product extracts ground (11) out by outlet well；It burns to gasification furnace working face
And retract to the setting for being located at coal seam drilling hole section rear end and stop after adopting line (13) position, complete underground coal gasification(UCG) operation；
E) burned out area handles operation: by charge pump integrated with the extraction of main borehole I (1) and main borehole II (2) pipe (5) respectively
The connection of earth's surface end interface, while injecting remover into burned out area by main borehole I (1) and main borehole II (2), cleanser, going out
Fiery agent；
f)CO2It seals operation up for safekeeping: gas injection is pumped to the earth's surface of pipe (5) integrated with the extraction of main borehole I (1) and main borehole II (2) respectively
End interface connection, while CO is injected into burned out area by main borehole I (1) and main borehole II (2)2Gas finally blocks air inlet
Well, outlet well and ignition well (9) are to CO2Gas is sealed up for safekeeping.
2. Poly-generation according to claim 1 is without well formula coal underground gasification method, which is characterized in that in step c), when
CH in gas bleeding4Stop gas drainage when concentration is down to 30% and utilize and continue for extraction, to CH4Concentration be down to 9% with
After lower and continual and steady setting time, gas drainage operation is completed.
3. Poly-generation according to claim 1 or 2 is without well formula coal underground gasification method, which is characterized in that in step a)
Two coal seam drilling hole sections are arranged in parallel.
4. Poly-generation according to claim 1 or 2 is without well formula coal underground gasification method, which is characterized in that in step a)
Branch hole (3) favours coal seam (12) forwards and moves towards direction construction.
5. Poly-generation according to claim 1 or 2 is without well formula coal underground gasification method, which is characterized in that in step a)
The drilling depth of branch hole (3) is 20~40m, and the spacing between multiple branch holes (3) is 5~10m.
6. Poly-generation according to claim 1 or 2 is without well formula coal underground gasification method, which is characterized in that in step b)
The plugging material in the space injected between high temperature resistant baffle I (7) and high temperature resistant baffle II (8) is using high hydroscopic resin as base-material
Fireproofing extinguishing materials are blocked up in high water seal.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424910A (en) * | 2019-08-31 | 2019-11-08 | 山东祥德机电有限公司 | Underground drill rig device and boring method that fire explosion occurs are limited based on forcing to spray water |
| CN110454134A (en) * | 2019-09-05 | 2019-11-15 | 湖南科技大学 | A kind of method of underground raw coal gasification |
| CN111425180A (en) * | 2020-04-01 | 2020-07-17 | 中国矿业大学 | UCG-CCS overlying strata fracture development height prediction method |
| CN112523733A (en) * | 2020-11-26 | 2021-03-19 | 河南省煤层气开发利用有限公司 | Outburst elimination method for coal bed gas and coal gasification combined mining area |
| CN112761612A (en) * | 2021-01-07 | 2021-05-07 | 中国煤炭地质总局勘查研究总院 | Method for underground coal gasification by using waste coal bed gas well |
| WO2022262261A1 (en) * | 2021-06-15 | 2022-12-22 | 柴兆喜 | Coalbed methane and coal gas mine |
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