CN106014345B - A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed - Google Patents
A kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed Download PDFInfo
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- CN106014345B CN106014345B CN201610446295.4A CN201610446295A CN106014345B CN 106014345 B CN106014345 B CN 106014345B CN 201610446295 A CN201610446295 A CN 201610446295A CN 106014345 B CN106014345 B CN 106014345B
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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
- E21B43/006—Production of coal-bed methane
Abstract
The invention discloses the pumping method that a kind of lower part caving method exploits the compound old dead zone coal bed gas to be formed, the present invention is by construction level well at 1 ~ 5 meter above the old dead zone fissure zone in lower part, carrying out coal bed gas extraction；When coal bed gas extraction amount drops to the 10% ~ 20% of Q, implements staged fracturing and to old dead zone coal bed gas extraction again, when coal bed gas extraction amount is re-lowered to the 10% ~ 20% of Q, injection supercritical carbon dioxide is gas displacing coal-bed；Extraction is carried out again until extraction amount falls to 6m3Stop extraction when/min.This method solve when original simple old dead zone using ground vertical drilling extraction, extraction drilling well and the old effective contact area of dead zone reservoir are small, extraction is limited in scope problem；The old dead zone coal bed gas resource in top will be closed on while the extraction lower layer old dead zone coal bed gas in position together in extraction, save cost；Simultaneously horizontal well be located in rock stratum, avoid the hoistway that drilling well occurs in coal seam cave in, blocking accident.
Description
Technical field
The present invention relates to the pumping methods that a kind of lower part caving method exploits the compound old dead zone coal bed gas to be formed, and belong to extraction
Coal bed gas technical field.
Background technology
Since long-term industrialization is exploited, there is countless numerous, the huge old dead zones of area in China.Only it is with Shanxi Province
Example ended for the end of the year 2013, and Shanxi Province shares more than 4700 abandoned mines, and for old dead zone area up to 5000 square kilometres, these are old
The excavation of dead zone be mostly using the lower old-fashioned blast-winning technology of recovery ratio, coal mining rate generally 50% ~ 60%,
It is even lower, therefore above-mentioned old dead zone preservation considerable coal bed gas resource gas reserves, related data is shown only with mountain
About 30 billion cubic meter of old dead zone Coal bed gas project for west saves.Gas is a kind of clean energy resource, and coal bed gas is remained to old dead zone
Recovery energy, the situation of China's natural gas insufficient supply can be effectively relieved；Gas is as a kind of pernicious gas, discharge simultaneously
It is 21 times of carbon dioxide to generated greenhouse effects in air, therefore has to the methane drainage and utilization project of this part gas good
Economic benefit and environmental benefit.
It is directed to extraction of the extraction primarily directed to the old dead zone gas of single working face of old dead zone gas at present, method is
From ground, into old dead zone top fissure zone, construction ground drilling well is with the old dead zone gas of extraction, during such method wellbore construction
Difficulty of construction is big, accident rate is high, one-tenth porosity is low.And a ground pit shaft can only be directed to an old dead zone and carry out extraction,
The methane output of extraction is low and of high cost.Chinese patent CN105114038A discloses a kind of by supercritical CO2Jet stream pressure
Split the method for the adjacent old old dead zone gas of empty interval coal column extraction same level two；Chinese patent CN104696006A is disclosed
A method of penetrating the old old dead zone remnants coal bed gas of dead zone abandoned coal pillar extraction multilayer of multilayer.
The above method is that the multiple old dead zone gas of vertical shaft extraction are made that important exploration.However, above-mentioned patent there is
Ground vertical drilling and the problems such as coalbed methane reservoir contact surface is small, extraction is limited in scope, extracting result is bad.
In fact, often preservation is in coalfield in the form of multilayer coal is separated by a certain distance in coal seam in coalfield, upper layer and lower layer
Coal mining will form compound old dead zone after completing.Due to history and mining conditions limitation etc., existing is compound old
Coal resources recovery ratio is limited when dead zone is exploited（Mostly below 60%）, inside contain the coal bed gas resource of considerable amount,
The collaboration extraction for being directed to compound old dead zone at present is still in opposite blank stage.
Invention content
In view of the above-mentioned problems, the present invention maximizes exploitation from coal bed gas resource while considering the angle of economic cost,
It is proposed it is a kind of by top tool post method lower part caving method exploit the compound old dead zone to be formed and up and down be all made of caving method exploit shape
At the method that goes out of compound old dead zone coal bed gas extraction simultaneously, solve existing coal bed gas resource abandon adopt caused by vast resources
Wasting phenomenon.
The present invention provides the pumping methods that a kind of lower part caving method exploits the compound old dead zone coal bed gas to be formed, including with
Lower step：
（1）According to mine shaft geology digging data, integrated use physical prospecting means determine that underground top, underlying seam have been opened
The old dead zone parameter dug（Excavate range, cavity, coal column distribution situation in old dead zone）, between the old dead zone in the old dead zone in lower part and top
Distance parameter；
（2）From above the coal column of old dead zone boundary at corresponding ground location at 1 ~ 5 meter above the old dead zone fissure zone in lower part
Construction level well；
Horizontal well by underground earthward extended spot can be divided into horizontal well horizontal segment, inclination section, horizontal well vertical section with
And horizontal well ground surface end, horizontal well ground surface end are divided into two branches by threeway：Drainage tube and beam pipe, wherein drainage tube one are collateral
Road is connected with valve I, and beam pipe side branch is connected with valve II, and horizontal well end near the ground is sealed, and there is sealing device on ground；
（3）Valve I on ground is opened, coal bed gas extraction is carried out by drainage tube, while recording coal in the unit interval at this time
Layer gas extraction amount Q；
（4）When coal bed gas extraction amount falls to the 10% ~ 20% of Q in the unit interval, by horizontal well horizontal segment every 10 ~ 30
Rice is divided into several staged fracturing sections, is pressure break spacer between each staged fracturing section, a length of 3 ~ 10 meters of pressure break spacer is torn open
It is with horizontal well fracturing technology that more than staged fracturing section until top is old by well head decentralization staged fracturing equipment to unload threeway
Rock stratum pressure break between the bottom plate of dead zone；
（5）Again threeway is installed, and carries out wellhead sealing, the valve I on drainage tube is opened, coal is carried out by drainage tube again
Layer gas extraction；
（6）When coal bed gas extraction amount falls to the 10% ~ 20% of Q again in the unit interval, valve I is closed, opens valve
II, by being pressed into temperature in the lateral old dead zone of beam pipe one it is 32 ~ 40 DEG C, the supercritical CO that pressure is 8 ~ 12MPa212 ~ 36 is small
When, wait for 24 ~ 36h quietly；
（7）It is again turned on valve I, closes valve II, coal bed gas extraction is carried out by drainage tube again；
（8）When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed, stops pumping 8 ~ 24 hours,
Opening valve I later, reducing extraction pressure continues coal bed gas extraction simultaneously；When coal bed gas extraction amount is again in the unit interval
When falling to 10% or less Q, it is again switched off valve I, stops pumping 8 ~ 24 hours, is again turned on valve I later, reduces extraction pressure
Carry out coal bed gas extraction；Recycle the above-mentioned process for stopping pumping-decompression extraction, until extraction pressure reduction to force down 80 than air ~
100kpa；
（9）When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
In said program, the horizontal well vertical section is passed through from the coal column of old dead zone boundary, the water with boundary coal column end
Flat distance is 10 ~ 60 meters, and the vertical depth of horizontal well horizontal segment is excavated the top fissure zone of the old dead zone in the lower part formed by underlying seam
Development height determine that the kickoff point (KOP) of horizontal well inclination section is chosen then by fixed horizontal well horizontal segment, horizontal well vertical section
Layer position and live drilling technology determine.
In said program, the staged fracturing technology is：Casing Limited entry fracturing, multiple-string packer staged fracturing, waterpower spray
Penetrate one kind in fracturing technique.
In said program, the old dead zone is that top tool post formula lower part is caving the compound old dead zone of formula or the upper and lower formula that is caving is answered
Close old dead zone.
The present invention cooperates with the angle of extraction from coal bed gas resource, by the remaining a large amount of coals in the old dead zone in top and lower part
Layer gas resource is taken into account simultaneously, it is proposed that a kind of innovative approach of collaboration extraction coal bed gas.This method efficiently solves original
When merely using the old dead zone of ground vertical drilling extraction, extraction drilling well and the old effective contact area of dead zone reservoir be small, extraction range
Limited problem；The old dead zone coal bed gas resource in top will be closed on while the extraction lower layer old dead zone coal bed gas in position together in extraction
Come, has accomplished that a well is multi-purpose, greatly saved cost；Horizontal well is located at the interlayer between the old dead zone in top and lower part simultaneously
Rock stratum avoids drilling well directly when beating to coal seam, since coal seam excessively loose and occurring hoistway cave-in accident and hoistway are blocked up
Plug accident.
Description of the drawings
Fig. 1 is the schematic diagram of 1 extraction coal bed gas of the embodiment of the present invention.
Fig. 2 is the schematic diagram of 2 extraction coal bed gas of the embodiment of the present invention.
In figure, 1, drainage tube, 2, valve I, 3, valve II, 4, beam pipe, 5, horizontal well vertical section, 6, boundary coal column, 7,
Inclination section, 8, the old dead zone in lower part, 9, the old dead zone fissure zone in lower part, 10, staged fracturing section, 11, pressure break spacer, 12, horizontal well
Horizontal segment, 13, the old dead zone in top, 14, horizontal well, 15, seal section；16, sealing device；17, threeway, 18 staged fracturing cracks.
Specific implementation mode
It is further illustrated the present invention below by embodiment, but is not limited to following embodiment.
Embodiment 1：The method that extraction top tool post lower part caving method exploits the compound old dead zone coal bed gas to be formed
The present embodiment is by taking Jin Mei groups Yue Cheng mine working faces as an example, as shown in Figure 1, illustrates the pumping method of the invention.
Yue Cheng mines are seated Qinshui coalfield, which is abundant one of the important coalfield of China's coal bed gas resource, and within the scope of coalfield field with "nine squares"
Interior minable coal seam is No. 9, No. 15 coal seams in No. 3 coal seams and Taiyuan Forma-tion of Shanxi group.Due to history and the backwardness of recovery method
Etc. reasons, No. 3 coal recovery ratios of main mining coal seam are low in coalfield, are retained in a large amount of coals in underground, old dead zone Coal bed gas project is quite rich
It is rich.No. 9 coals of girdle for being 47.16 meters with 3 coal seam floor average headways, the coal that is averaged is 1 meter thick, and when two layers of upper layer and lower layer position, coal is opened
When to dig the old dead zone formed be that top tool post formula lower part is caving formula compound old dead zone, to solve the collaboration exploitation of coal bed gas resource,
The invention provide specific method be：
1）It is comprehensive simultaneously according to the existing geology digging data such as coal mine excavation situation, coal seam block diagram, surface-underground contrast plan
The old dead zone parameter that underground top, underlying seam have been excavated is determined with physical prospecting means（Include mainly that model is excavated in old dead zone
It encloses, cavity, coal column distribution situation etc.）, the parameters such as the distance between the old dead zone in lower part and the old dead zone in top；
2）By old dead zone boundary coal column（6）The ground location of top is to the old dead zone fissure zone in lower part（9）It constructs at 2 meters of top
Horizontal well（14）,
Horizontal well（14）By underground, earthward extended spot can be divided into horizontal well horizontal segment（12）, inclination section（7）, it is horizontal
Well vertical section（5）And horizontal well ground surface end, wherein horizontal well ground surface end is by threeway（17）It is divided into two branches, drainage tube（1）
Side branch is connected with valve I（2）, beam pipe（4）Side branch is connected with valve II（3）, horizontal well end near the ground is sealed into
Seal section（15）, there is sealing device on ground（16）；Sealing water mud and mortar sealing.
3）Open valve I on ground（2）, by drainage tube（1）Coal bed gas extraction is carried out, while being recorded in the unit interval at this time
Coal bed gas extraction amount Q；
4）When coal bed gas extraction amount falls to the 20% of Q in the unit interval, by horizontal well horizontal segment（12）It is drawn every 20 meters
It is divided into several staged fracturing sections（10）, it is pressure break spacer between each staged fracturing section（11）, pressure break spacer（11）A length of 5
Rice dismantles threeway（17）Staged fracturing equipment is transferred by well head, with horizontal well fracturing technology by staged fracturing section（10）
Above until the old dead zone in top（13）Rock stratum pressure break between bottom plate makes to generate lateral, longitudinal crack between the rock stratum of this layer of position, link up
The old dead zone in top（13）With horizontal well（14）；
5）Again threeway is installed（17）, and wellhead sealing is carried out, open valve I（2）, again by drainage tube（1）Carry out coal
Layer gas extraction；
6）When coal bed gas extraction amount falls to the 20% of Q again in the unit interval, valve I is closed（2）, open valve II
（3）, by beam pipe（4）Into old dead zone be pressed into temperature be 32 DEG C, the supercritical CO that pressure is 9MPa236 hours, it is small to wait for 24 quietly
When；
7）It is again turned on valve I（2）Close valve II（3）, again by drainage tube（1）Carry out coal bed gas extraction；
8）When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed（2）, stop taking out 8 hours,
Valve I is opened later（2）Reducing extraction pressure continues coal bed gas extraction simultaneously；When coal bed gas extraction amount is again in the unit interval
It is secondary when falling to 10% or less Q, it is again switched off valve I（2）, stop taking out 8 hours, be again turned on valve I later（2）, reduce again
Extraction pressure carries out coal bed gas extraction；The above-mentioned process for stopping pumping-decompression extraction is recycled, until extraction pressure reduction is to than atmospheric pressure
Low 80kpa；
9）When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
Above-mentioned horizontal well vertical section（5）From old dead zone boundary coal column（6）In pass through, the horizontal distance with boundary coal column end
It is 40 meters, horizontal well horizontal segment（12）Vertical depth the old dead zone in the lower part formed is excavated by underlying seam（8）The old dead zone in top split
Gap band（9）Development height determine, horizontal well inclination section（7）Kickoff point (KOP) choose then by fixed horizontal well horizontal segment
（12）, horizontal well vertical section（5）Layer position and live drilling technology determine.
The staged fracturing equipment divided into above-mentioned horizontal well orientation staged fracturing is needed according to which kind of segmentation specifically used
Fracturing technique determines that specific staged fracturing technology can be casing Limited entry fracturing, multiple-string packer staged fracturing, waterpower spray
Any one of fracturing technique is penetrated, needs that field working conditions and completion mode is combined to determine in specific implementation.
Embodiment 2：Extraction upper and lower are all made of the method that caving method exploits the compound old dead zone coal bed gas to be formed
Below by taking Jin Mei groups Shanxi sage's coal mine working face as an example, illustrate the inventive method.Shanxi sage's coal mine is seated Qinshui
Coalfield, the coalfield are abundant one of the important coalfields of China's coal bed gas resource, and minable coal seam is Shanxi in field with "nine squares" within the scope of coalfield
No. 9, No. 15 coal seams in No. 3 coal seams and Taiyuan Forma-tion of group.Due to backwardness of history and recovery method etc., master adopts in coalfield
The coal recovery ratio of coal seam 3 is low, is retained in a large amount of coals in underground, and old dead zone Coal bed gas project is quite abundant.Between being averaged with 3 coal seam floors
Away from No. 9 coals of girdle for 53.20 meters, the coal that is averaged is 0.81 meter thick, and when two layers of upper layer and lower layer position, coal excavates the old dead zone to be formed
When to be caving the old dead zone of formula up and down, to solve the collaboration exploitation of compound old dead zone coal bed gas resource, the specific side which provides
Method is：
1）It is comprehensive simultaneously according to the existing geology digging data such as coal mine excavation situation, coal seam block diagram, surface-underground contrast plan
The old dead zone parameter that underground top, underlying seam have been excavated is determined with physical prospecting means（Include mainly that model is excavated in old dead zone
It encloses, cavity, coal column distribution situation etc.）, the parameters such as the distance between the old dead zone in lower part and the old dead zone in top；
2）By old dead zone boundary coal column（6）The ground location of top is to the old dead zone fissure zone in lower part（9）It is applied at 1.6 meters of top
Work horizontal well（14）,
By underground, earthward extended spot can be divided into horizontal well horizontal segment to horizontal well（12）, inclination section（7）, horizontal well hang down
Straight section（5）And horizontal well ground surface end, wherein horizontal well ground surface end is by threeway（17）It is divided into two branches, drainage tube（1）Side
Branch is connected with valve I（2）, beam pipe（4）Side branch is connected with valve II（3）, horizontal well end near the ground is sealed into sealing
Section（15）, there is sealing device on ground（16）；Sealing is sealed by cement and mortar.
3）Open valve I on ground（2）, by drainage tube（1）Coal bed gas extraction is carried out, while being recorded in the unit interval at this time
Coal bed gas extraction amount Q；
4）When coal bed gas extraction amount falls to the 20% of Q in the unit interval, by horizontal well horizontal segment（12）It is drawn every 18 meters
It is divided into several staged fracturing sections（10）, it is pressure break spacer between each staged fracturing section（11）, pressure break spacer（11）A length of 6
Rice dismantles threeway（17）Staged fracturing equipment is transferred by well head, with horizontal well fracturing technology by staged fracturing section（10）
Above until the old dead zone in top（13）Rock stratum pressure break between bottom plate makes to generate lateral, longitudinal crack between the rock stratum of this layer of position, link up
The old dead zone in top（13）With horizontal well（14）；
5）Again threeway is installed（17）, and wellhead sealing is carried out, open valve I（2）, again by drainage tube（1）Carry out coal
Layer gas extraction；
6）When coal bed gas extraction amount falls to the 20% of Q again in the unit interval, valve I is closed（2）, open valve II
（3）, by beam pipe（4）Into old dead zone be pressed into temperature be 36 DEG C, the supercritical CO that pressure is 10MPa226 hours, wait for 30 quietly
Hour；
7）It is again turned on valve I（2）Close valve II（3）, again by drainage tube（1）Carry out coal bed gas extraction；
8）When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed（2）, stop taking out 14 hours,
Valve I is opened later（2）Reducing extraction pressure continues coal bed gas extraction simultaneously；When coal bed gas extraction amount is again in the unit interval
It is secondary when falling to 10% or less Q, it is again switched off valve I（2）, stop taking out 14 hours, be again turned on valve I later（2）, drop again
Low extraction pressure carries out coal bed gas extraction；The above-mentioned process for stopping pumping-decompression extraction is recycled, until extraction pressure reduction is to than air
Force down 88kpa；
9）When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
Above-mentioned horizontal well vertical section（5）From old dead zone boundary coal column（6）In pass through, the horizontal distance with boundary coal column end
It is 30 meters, horizontal well horizontal segment（12）Vertical depth the old dead zone in the lower part formed is excavated by underlying seam（8）The old dead zone in top split
Gap band（9）Development height determine, horizontal well inclination section（7）Kickoff point (KOP) choose then by fixed horizontal well horizontal segment
（12）, horizontal well vertical section（5）Layer position and live drilling technology determine.
The staged fracturing equipment divided into above-mentioned horizontal well orientation staged fracturing is needed according to which kind of segmentation specifically used
Fracturing technique determines that specific staged fracturing technology can be casing Limited entry fracturing, multiple-string packer staged fracturing, waterpower spray
Any one of fracturing technique is penetrated, needs that field working conditions and completion mode is combined to determine in specific implementation.
Claims (5)
1. a kind of lower part caving method exploits the pumping method for the compound old dead zone coal bed gas to be formed, it is characterised in that：Including following
Step：
（1）According to mine shaft geology digging data, integrated use physical prospecting means determine that underground top, underlying seam have been excavated
Old dead zone parameter, the distance between the old dead zone in lower part and the old dead zone in top parameter；Old dead zone parameter include old dead zone excavate range,
Cavity, coal column distribution situation；
（2）To construction at 1 ~ 5 meter above the old dead zone fissure zone in lower part at from the corresponding overhead surface position of old dead zone boundary coal column
Horizontal well；
By underground, earthward extended spot can be divided into horizontal well horizontal segment, inclination section, horizontal well vertical section and water to horizontal well
Horizontal well ground surface end, horizontal well ground surface end are divided into two branches by threeway：Drainage tube and beam pipe, wherein drainage tube side branch connect
There are valve I, beam pipe side branch to be connected with valve II, horizontal well end near the ground is sealed, and there is sealing device on ground；
（3）Valve I on ground is opened, coal bed gas extraction is carried out by drainage tube, while recording coal bed gas in the unit interval at this time
Extraction amount Q；
（4）When coal bed gas extraction amount falls to the 10% ~ 20% of Q in the unit interval, horizontal well horizontal segment is drawn every 10 ~ 30 meters
It is divided into several staged fracturing sections, is pressure break spacer, a length of 3 ~ 10 meters of pressure break spacer, dismounting three between each staged fracturing section
It is logical to use horizontal well fracturing technology by the more than staged fracturing section until old dead zone in top by well head decentralization staged fracturing equipment
Rock stratum pressure break between bottom plate；
（5）Again threeway is installed, and carries out wellhead sealing, the valve I on drainage tube is opened, coal bed gas is carried out by drainage tube again
Extraction；
（6）When coal bed gas extraction amount falls to the 10 ~ 20% of Q again in the unit interval, valve I is closed, opens valve II, by
Beam pipe is pressed into the supercritical CO that implantation temperature is 32 ~ 40 DEG C, pressure is 8 ~ 12MPa into old dead zone212 ~ 36 hours, wait for quietly
24~36h；
（7）It is again turned on valve I, closes valve II, coal bed gas extraction is carried out by drainage tube again；
（8）When coal bed gas extraction amount falls to 10% or less Q in the unit interval, valve I is closed, stops pumping 8 ~ 24 hours, later
Opening valve I, reducing extraction pressure continues coal bed gas extraction simultaneously；When coal bed gas extraction amount declines again in the unit interval
For Q 10% or less when, be again switched off valve I, stop pumping 8 ~ 24 hours, be again turned on valve I later, reduce extraction pressure and carry out
Coal bed gas extraction；The above-mentioned process for stopping pumping-decompression extraction is recycled, until extraction pressure reduction extremely forces down 80 ~ 100kpa than air；
（9）When unit interval coal bed gas extraction amount falls to 6m3Stop coal bed gas extraction when/min.
2. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special
Sign is：The horizontal well vertical section is passed through from the coal column of old dead zone boundary, and the horizontal distance with boundary coal column end is 10 ~ 60
Rice, the development height that the vertical depth of horizontal well horizontal segment is excavated the top fissure zone of the old dead zone in the lower part formed by underlying seam are determined
Fixed, the kickoff point (KOP) of horizontal well inclination section is chosen then by fixed horizontal well horizontal segment, the layer position of horizontal well vertical section and existing
Field drilling technology determines.
3. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special
Sign is：Horizontal well fracturing technology is：Casing Limited entry fracturing, multiple-string packer staged fracturing, hydraulic jetting fracturing technology
In one kind.
4. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special
Sign is：The old dead zone is that top tool post formula lower part is caving the compound old dead zone of formula.
5. lower part caving method according to claim 1 exploits the pumping method for the compound old dead zone coal bed gas to be formed, special
Sign is：The old dead zone is to be caving the compound old dead zone of formula up and down.
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| CN109162676B (en) * | 2018-09-27 | 2020-11-17 | 太原理工大学 | Method for simultaneously extracting and utilizing coal bed gas and accumulated water in goaf |
| CN113530511B (en) * | 2020-04-21 | 2023-06-30 | 中国石油天然气股份有限公司 | Method for developing natural gas reservoir |
| CN111980631B (en) * | 2020-08-11 | 2022-11-18 | 太原理工大学 | Method for collaborative gas extraction of goaf and underlying coal seam |
| CN112145132A (en) * | 2020-10-12 | 2020-12-29 | 山西晋城无烟煤矿业集团有限责任公司 | Well drilling method for extracting coal bed gas of adjacent closed goaf group |
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