CN107387043B - A kind of method that the spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio - Google Patents
A kind of method that the spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title claims abstract description 23
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 244000005700 microbiome Species 0.000 claims abstract description 32
- 239000000243 solution Substances 0.000 claims abstract description 26
- 239000007864 aqueous solution Substances 0.000 claims abstract description 17
- 241000233866 Fungi Species 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000015556 catabolic process Effects 0.000 claims abstract description 13
- 238000006731 degradation reaction Methods 0.000 claims abstract description 13
- 241000894006 Bacteria Species 0.000 claims abstract description 12
- 239000002817 coal dust Substances 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 57
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 abstract description 8
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 abstract description 8
- 235000012538 ammonium bicarbonate Nutrition 0.000 abstract description 8
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- 238000005516 engineering process Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000002906 microbiologic effect Effects 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 51
- 229910002092 carbon dioxide Inorganic materials 0.000 description 15
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Natural products CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
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- 238000011105 stabilization Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 description 1
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 1
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- 239000003337 fertilizer Substances 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
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Classifications
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses the methods that a kind of spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio, include the following steps: S1, selection target region；S2, according to the coal of target area composition and coal seam water environment, select and cultivate the coalification microorganism fungus kind of suitable one's respective area；S3, cultured coalification microorganism fungus kind is injected into coal seam, the coal dust dissolved in coal seam fracture and duct forms coal solution；S4, insoluble matter remaining in coal solution degradation bacterium resolution process coal solution and coal seam fracture is injected into coal seam；S5, by the injection of angry object aqueous solution by treated the coal seam step S4；S6, closing well head carry out stewing well processing；S7, after stewing well, inject air into coal seam and carry out displacement.The present invention is increased production using microbiological transformation technology and ammonium bicarbonate aqueous solution, has the advantages of simple process, low energy consumption, the existing Technology development such as pollution-free hardly matches.
Description
Technical field
The present invention relates to coal-bed gas exploitation fields, and in particular to a kind of gas-liquid alternately injection spontaneous multicomponent gas displacement in coal seam
The method for improving coal bed gas recovery ratio.
Background technique
Coal bed gas is a kind of high-efficiency cleaning energy, is national strategy resource, is a kind of important unconventional petroleum resources.I
State's coal bed gas resource is abundant, and reserves are huge, widely distributed.Coal bed gas is distributed in coal seam as a kind of special petroleum resources,
Domestic multiple coal blocks have carried out cbm development at present, but most research paneling effects are undesirable, main cause
It is determined by geologic(al) factors such as coal seam low pressure low porosity and low permeabilities, secondly not perfect for recovery method, exploitation measure is not in place to be caused.
Coal seam degree of consolidation is lower, and a large amount of coal dusts are contained in hole, blocks Properties of Water-gas Flowing Through Porous Media channel.Coal is a kind of complicated big
Molecule, the labyrinth substance with polycyclic aromatic hydrocarbons (PAH).Therefore the bacterium such as pseudomonad for the aromatic ring that can degrade etc. can be selected to carry out
Vehicle treated, the compound after degradation have phenols, carboxylic class, hydroxyl class, water-soluble substance such as aldehydes and the molten object of a small amount of coal
Equal impurity.Coalification microorganism can be to be easy the pulverized coal particle degraded and hole on the coal dust and coal seam hole wall in Solution fissure hole
The pointed projections of wall point and hole wall surface, while releasing a large amount of thermal energy.Patent 2015102091512 discloses a kind of coal seam
Biological plugging releasing method digests cleat in coal blocking particles using the incoalation of microorganism, and extension crack passage promotes coal
Body gas permeability realizes cracks in coal seam de-plugging dredging.
Anaerobe (such as methagen) is a kind of strain of molten object of coal of processing well, can be divided the molten object of coal
Solution obtains methane, the substances such as ethane and ethyl alcohol, thus further loose and clear up seepage channel.
The main component of coal bed gas is methane, and methane molecule is with adsorbed state preservation and matrix of coal surface.By retrieval with
Literature survey, coal bed methane exploring method is mostly direct carbon dioxide injection displacement or carries out huff and puff to improve coal bed gas at present
Yield.Patent 2013100327663 discloses a kind of use and multielement hot fluid injection coal seam is carried out single well stimulation to improve
The method of coal bed gas recovery ratio.Patent 2016104593734 discloses a kind of molten by being implanted sequentially inflating medium to subterranean coal
Liquid system, active aqueous systems and bubble release agent solution system slug, are spontaneously generated carbon dioxide foam systems in underground and carry out individual well
It handles up the method for improving Production of Coal-bed Gas Wells.
Above method can preferably provide a kind of technical method for improving coal bed gas recovery ratio, but there is also certain
It is insufficient.For example microorganism solution blocking method dredges the coal dust of cracks in coal seam, the problem of very good solution coal dust blocking.But
There is no the desorption rates for accelerating adsorbed gas for this method, and the metabolite generated after microorganism incoalation is not examined
Consider, part metabolite is likely to cause the secondary blocking in coal seam.And gas the methods of is handled up and to have upset the continuous mining in coal seam
System brings certain influence to the continuous mining of the stabilization of pulverized coal particle and coal bed gas well.
Summary of the invention
It is excellent it is an object of the invention to solve at least the above problems and/or defect, and provide at least to will be described later
Point.
A further object of the invention is to solve in the prior art, and microorganism solution blocking method cannot accelerate the desorption of adsorbed gas
Rate, and the metabolite generated after microorganism incoalation does not have subsequent processing, part metabolite is likely to cause coal
The problem of secondary blocking of layer；Gas method of handling up can upset the continuous mining system in coal seam simultaneously, to the stabilization of pulverized coal particle
And the continuous mining of coal bed gas well brings the technical problems such as certain influence.
In order to realize these purposes and other advantages of the invention, the present invention provides a kind of spontaneous multicomponent gas displacements in coal seam
The method for improving coal bed gas recovery ratio comprising following steps:
S1, selection target region；
S2, according to the coal of target area composition and coal seam water environment, select and cultivate the coalification microorganism of suitable one's respective area
Strain；
S3, cultured coalification microorganism fungus kind is injected into coal seam, the coal dust dissolved in coal seam fracture and duct forms coal
Solution；
S4, insoluble matter remaining in coal solution degradation bacterium resolution process coal solution and coal seam fracture is injected into coal seam；
S5, by the injection of angry object aqueous solution by treated the coal seam step S4；
S6, closing well head carry out stewing well processing；
S7, after stewing well, inject air into coal seam and carry out displacement.
Preferably, in the step S1, target area should be the well group of the lesser well pattern improvement of well spacing, gas output per well
Lower, seam construction is relatively flat, the preferable region of roof and floor airtightness.
Preferably, the coalification microorganism fungus kind injection rate is no more than 0.01PV within the scope of single well-controlled, infuses per hour
Enter amount no more than 6m3。
Preferably, the coal solution degradation bacterium is anaerobic methane bacillus.
Preferably, the anaerobic methane bacillus dosage is 1/5th of solvable coal microorganism fungus kind injection rate, per small
When the controlling of injecting quantity in 10m3Below.
Preferably, the angry object aqueous solution is saturation NH4HCO3Aqueous solution, injection rate 0.05PV, injection pressure are low
In coal seam fracture pressure.
Preferably, the time of the stewing well processing is 10~15 days.
Preferably, injection rate is less than 180m to the air per hour3, then stop after injecting air and breaking through gas recovery well
Gas injection.
The invention has the beneficial effects that:
One, this method have carried out multiple breaking block treatment to coal seam seepage channel, are more advantageous to coal seam air water in hole crazing
Flowing in seam further increases coal bed gas content wherein second of de-plugging process product is methane.
Secondly, ammonium bicarbonate aqueous solution is injected after microorganism de-plugging, injection coal seam is thermally decomposed to generate CO2And NH3Belong to
In the spontaneous multicomponent gas in coal seam, CO2And NH3Absorption property on matrix of coal surface is better than CH4, especially NH3, NH3Between coal
Interaction it is stronger, almost CO210 times or so of function and effect between coal, adsorption capacity are far longer than methane and coal
Adsorption capacity, therefore CO2And NH3The methane of coal seam absorption can be largely replaced, methane output is improved；And utilize microorganism coal
This property of change process heat release generates ammonia for ammonium bicarbonate breaks down and carbon dioxide provides thermal energy, avoids and carry out to coal seam
Additional heating.
Thirdly, the product in coal seam water after remaining ammonium hydrogen carbonate and microorganism incoalation etc. can be used as agriculture plant
The substances such as growth promoter, nonstaining property can be convenient ground produced water treatment process.
Four, this method displacement gas source is air, and without any pollution, save the cost is safe and efficient, is reached with the smallest cost
The purpose of displacement has been arrived, so that production-increasing function area is bigger, while reducing the external strain for having desorbed subterranean zone, has prevented strain
It is largely multiplied in coal seam, destroys the prototype structure of coal, preferably keep coal seam prime stratum environment, guarantee that subsequent coal mine is opened
It adopts.
Five, the present invention is increased production using microbiological transformation technology and ammonium bicarbonate aqueous solution, and entire method was implemented
The continuous mining of producing well in journey, does not interrupt the continuity of mining, facilitates the exploitation of coal bed gas, have simple process, low energy consumption,
The incomparable advantage of pollution-free equal Technology developments.
Detailed description of the invention
The spontaneous multicomponent gas displacement in coal seam Fig. 1 of the invention improves the process flow chart of coal bed gas recovery ratio.
Each step of Fig. 2 the method for the present invention acts on schematic diagram, figure label: extraction well 1, injection well 11, stratum 2, coal seam
3, coalification microorganism fungus kind sphere of action 4, coal solution degradation bacterium sphere of action 5, multicomponent gas displacement methane range 6, injection are empty
Gas range 7.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
A kind of method that the spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio, process flow is as shown in Figure 1, tool
Body includes the following steps:
The suitable volume increase target area of S1, first selection, which should be the well group of the lesser well pattern improvement of well spacing, individual well
Gas production is lower, and seam construction is relatively flat, the preferable region of roof and floor airtightness.
S2, according to the coal of selected areas composition and coal seam water environment, select and cultivate the coalification microorganism of suitable one's respective area
Strain, the strain are solvable coal microorganism.
S3, cultured coalification microorganism fungus kind is injected to coal seam, injection rate is no more than 0.01PV within the scope of single well-controlled,
Injection rate is no more than 6m per hour3.Coalification microorganism fungus kind injection coal seam had into 3 effects: the first, containing a large amount of in coal seam
Coal dust, coalification microorganism can dissolve the coal dust in coal seam fracture and duct, dredge seepage channel；The second, microorganism can be molten
It is easy the pointed projections point and hole wall surface of the coal dust degraded and hole wall on solution coal seam hole wall, increases the area of seepage channel,
Increase coal seam permeability；Third, the process of biosolubilization coal dust are an exothermic process, release big calorimetric in course of dissolution
Amount increases coal seam temperature.Coal seam temperature is higher, is more conducive to the desorption of methane gas in coal seam, increases gas well yield, meanwhile,
Coal seam temperature is higher, is more conducive to ammonium hydrogen carbonate in subsequent step S5 and is thermally decomposed to generate NH3And CO2, displace the methane of absorption
Gas.
After S4, injection coalification microorganism fungus kind are completed, start to inject coal solution degradation bacterium processing coal solution, preferably anaerobism
Methagen, anaerobic methane bacillus dosage are 1/5th of solvable coal microorganism fungus kind injection rate, per hour the controlling of injecting quantity
In 10m3Below.A series of compounds are generated after microorganism incoalation, the compound after degradation has phenols, carboxylic class, hydroxyl class, aldehyde
Water-soluble substance such as class, also containing the insoluble complicated organic matter of a small amount of macromolecular not soluble in water.The methagen of injection
Equal coals solution processing bacterium can degrade part insoluble matter, and metabolite is acetic acid, methane etc..The purpose of this step be in order to
Insoluble matter remaining in coal seam fracture is removed in degradation, dredges seepage channel, while degradation bacteria metabolism generates methane, increases coal seam first
Alkane content.
S5, by the injection of angry object aqueous solution by treated the coal seam step S4, the angry object of injection is generally water-soluble
Liquid, aqueous solution are easy to inject coal seam.Preferred anger object is saturation NH4HCO3Aqueous solution, injection rate 0.05PV, injection pressure
Lower than coal seam fracture pressure, Surface heat source should be completely cut off in injection process, prevents angry object aqueous solution from being thermally decomposed on ground.Carbon
Sour hydrogen ammonium is a kind of common chemical raw material and a kind of crops chemical fertilizer.Its property is unstable, and 36 DEG C or more are decomposed into
CO2、NH3And H2O, 60 DEG C can decompose, reaction equation are as follows:
S6, closing well head carry out stewing well processing, and boiling in a covered pot over a slow fire the well time is 10~15 days.In normal geothermal gradient, buried depth
The coal seam temperature of 800m generally can reach 40 DEG C or more, in addition (the hair of the molten coal of biology of heat caused by microorganism decomposition coal dust
The calorific value of heat and raw coal is roughly the same, about the 94%~97% of raw coal), coal seam temperature is enough to make the NH of injection4HCO3Point
Solution generates a large amount of NH3And CO2.And NH3And CO2Adsorption capacity be all much larger than methane, especially NH3, NH3Phase between coal
Interaction is stronger, almost CO210 times or so of function and effect between coal, adsorption capacity is far longer than the absorption of methane and coal
Ability.Therefore, NH3And CO2There is time enough to displace the methane gas of coal surface absorption, so that a large amount of methane be made to fill
It decomposes and inhales, methane gas is full of coal seam hole.
S7, after stewing well, inject air into coal seam and carry out displacement.Injection rate is less than 180m to air per hour3, work as note
Enter after air breaks through gas recovery well and then stops gas injection.NH3And CO2The reaction for displacing methane gas all occurs near injection well,
And injection well distal end coal seam function and effect are slower, injection air can be to the coalification microorganism that front is injected and angry object aqueous solution
Displacement is carried out, its sphere of action is increased, displaced methane increases.Increase the pressure difference between injection well and producing well simultaneously, adds
Fast coal seam fluid neuron network speed, improves methane output.
Fig. 2 concrete image depicts the spontaneous multicomponent gas displacement in coal seam of the invention and improves each of coal bed gas recovery ratio method
Step acts on schematic diagram.
In conclusion the present invention relates to a kind of gas-liquid, alternately the spontaneous multicomponent gas displacement in injection coal seam improves coal bed gas
The method of recovery ratio.Wherein, coalification microorganism fungus kind solution, coal solution degradation bacterium solution and the life that step S3~S5 is implanted sequentially
Gas object aqueous solution is liquid, and step S7 injects air, therefore referred to as gas-liquid is alternately injected；Ammonium hydrogen carbonate is thermally decomposed in coal seam
Generate NH3And CO2, methane gas is generated after injecting coal solution degradation bacterium, therefore referred to as spontaneous multicomponent gas.This method can dredge
Ammonium bicarbonate aqueous solution is injected on the basis of logical coal seam seepage channel, it is decomposed under the action of the high temperature of coal seam and generates titanium dioxide
Carbon and ammonia to improve methane output, and have simple process, and low energy consumption is pollution-free to wait Technology developments that compare
Quasi- advantage.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (8)
1. a kind of method that the spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio, which comprises the steps of:
S1, selection target region；
S2, according to the coal of target area composition and coal seam water environment, select and cultivate the coalification microorganism fungus kind of suitable one's respective area；
S3, cultured coalification microorganism fungus kind is injected into coal seam, the coal dust dissolved in coal seam fracture and duct forms coal solution；
S4, insoluble matter remaining in coal solution degradation bacterium resolution process coal solution and coal seam fracture is injected into coal seam；
S5, by the injection of angry object aqueous solution by treated the coal seam step S4；
S6, closing well head carry out stewing well processing；
S7, after stewing well, inject air into coal seam and carry out displacement.
2. the method that the spontaneous multicomponent gas displacement in coal seam as described in claim 1 improves coal bed gas recovery ratio, which is characterized in that
In the step S1, target area should be the well group of the lesser well pattern improvement of well spacing, and gas output per well is lower, and seam construction is more
It is flat, the preferable region of roof and floor airtightness.
3. the method that the spontaneous multicomponent gas displacement in coal seam as claimed in claim 2 improves coal bed gas recovery ratio, which is characterized in that
The coalification microorganism fungus kind injection rate is no more than 0.01PV within the scope of single well-controlled, and injection rate is no more than 6m per hour3。
4. the method that the spontaneous multicomponent gas displacement in coal seam as described in claim 1 improves coal bed gas recovery ratio, which is characterized in that
The coal solution degradation bacterium is anaerobic methane bacillus.
5. the method that the spontaneous multicomponent gas displacement in coal seam as claimed in claim 4 improves coal bed gas recovery ratio, which is characterized in that
The anaerobic methane bacillus dosage is 1/5th of solvable coal microorganism fungus kind injection rate, and the controlling of injecting quantity is in 10m per hour3
Below.
6. the method that the spontaneous multicomponent gas displacement in coal seam as claimed in claim 5 improves coal bed gas recovery ratio, which is characterized in that
The anger object aqueous solution is saturation NH4HCO3Aqueous solution, injection rate 0.05PV, injection pressure are lower than coal seam fracture pressure.
7. the method that the spontaneous multicomponent gas displacement in coal seam as claimed in claim 6 improves coal bed gas recovery ratio, which is characterized in that
The time of the stewing well processing is 10~15 days.
8. the method that the spontaneous multicomponent gas displacement in coal seam as claimed in claim 7 improves coal bed gas recovery ratio, which is characterized in that
Injection rate is less than 180m to the air per hour3, then stop gas injection after injecting air and breaking through gas recovery well.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2003021079A1 (en) * | 2001-08-28 | 2003-03-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for the extraction and transport of gas hydrates and gases from gas hydrates |
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| US4411802A (en) * | 1981-09-08 | 1983-10-25 | Uop Inc. | Enhanced oil recovery |
| WO2003021079A1 (en) * | 2001-08-28 | 2003-03-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for the extraction and transport of gas hydrates and gases from gas hydrates |
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| CN105971573A (en) * | 2016-06-22 | 2016-09-28 | 中国石油大学(华东) | System and method for automatically generating CO2 foam and exploiting coalbed methane in huff-puff mode underground |
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