CN107387043A - A kind of method that spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio - Google Patents
A kind of method that 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 46
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 27
- 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 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 244000005700 microbiome Species 0.000 claims abstract description 32
- 239000000243 solution Substances 0.000 claims abstract description 27
- 239000007864 aqueous solution Substances 0.000 claims abstract description 17
- 241000233866 Fungi Species 0.000 claims abstract description 15
- 241000894006 Bacteria Species 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 12
- 239000002817 coal dust Substances 0.000 claims abstract description 11
- 230000015556 catabolic process Effects 0.000 claims abstract description 10
- 238000006731 degradation reaction Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 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
- 239000001099 ammonium carbonate Substances 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 8
- 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
- 230000009471 action Effects 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
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- 238000005065 mining Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000002207 metabolite Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 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
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 2
- 239000002195 soluble material Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 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
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
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- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000004090 dissolution Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007952 growth promoter Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 210000002569 neuron Anatomy 0.000 description 1
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- 230000000638 stimulation Effects 0.000 description 1
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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
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- 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 method that a kind of spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio, comprise 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 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 angry thing aqueous solution injection by step S4 processing after coal seam in；S6, closing well head carry out stewing well processing；S7, after stewing well, into coal seam injecting air carries out displacement.The advantages of present invention is increased production using microbiological transformation technology and ammonium bicarbonate aqueous solution, simple with technique, low energy consumption, and the existing Technology development such as pollution-free hardly matches.
Description
Technical field
The present invention relates to coal-bed gas exploitation field, and in particular to a kind of alternately injection spontaneous multicomponent gas displacement in coal seam of gas-liquid
The method for improving coal bed gas recovery ratio.
Background technology
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 enriches, 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
Determined by geologic(al) factors such as coal seam low pressure low porosity and low permeabilities, be secondly recovery method imperfection, exploitation measure is not in place to be caused.
Coal seam degree of consolidation is relatively low, and a large amount of coal dusts are contained in hole, blocks Properties of Water-gas Flowing Through Porous Media passage.Coal is a kind of complicated big
Molecule, there is the labyrinth material of polycyclic aromatic hydrocarbons (PAH).Therefore bacterium such as pseudomonad for the aromatic ring that can degrade etc. can be selected to carry out
Vehicle treated, the compound after degraded have water-soluble materials such as phenols, carboxylic class, hydroxyl class, aldehydes and the molten thing of a small amount of coal
Deng impurity.Coalification microorganism can be with the pulverized coal particle easily degraded on the coal dust in Solution fissure hole and coal seam hole wall and hole
The pointed projections of wall point and hole wall surface, while discharge a large amount of heat energy.Patent 2015102091512 discloses a kind of coal seam
Biological plugging releasing method, cleat in coal blocking particles are digested using the incoalation of microorganism, extension crack passage, lifting coal
Body gas permeability, realize that cracks in coal seam de-plugging is dredged.
Anaerobe (such as methagen) is a kind of strain of the molten thing of coal of processing well, can be divided the molten thing of coal
Solution obtains methane, the material such as ethane and ethanol, so as to 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 progress 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 into single well stimulation so as 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, carbon dioxide foam systems are spontaneously generated in underground and carry out individual well
Handle up improve Production of Coal-bed Gas Wells method.
Above method can preferably provide a kind of technical method for improving coal bed gas recovery ratio, but there is also certain
Deficiency.For example microorganism solution blocking method is dredged to the coal dust of cracks in coal seam, solves the problems, such as coal dust blocking well.But
This method does not have the desorption rate for accelerating adsorbed gas, and metabolite caused by after microorganism incoalation is not examined
Consider, part metabolite is likely to cause the secondary blocking in coal seam.And gas the methods of handling up, has upset the continuous mining in coal seam
System, the continuous mining of stabilization and coal bed gas well on pulverized coal particle bring certain influence.
The content of the invention
It is an object of the invention to solve at least the above and/or defect, and provide at least will be described later it is excellent
Point.
A further object of the invention is that solve in the prior art, and microorganism solution blocking method can not accelerate the desorption of adsorbed gas
Speed, and metabolite caused by after microorganism incoalation does not have subsequent treatment, 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 further advantage of the invention, the invention provides a kind of spontaneous multicomponent gas displacement in coal seam
The method for improving coal bed gas recovery ratio, it comprises 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 of suitable one's respective area
Strain；
S3, cultured coalification microorganism fungus kind 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 angry thing aqueous solution injection by step S4 processing after coal seam in；
S6, closing well head carry out stewing well processing；
S7, after stewing well, into coal seam injecting air carries out displacement.
Preferably, in the step S1, target area should be the well group of the less well pattern improvement of well spacing, gas output per well
Relatively low, seam construction is relatively flat, the preferable region of roof and floor seal.
Preferably, the coalification microorganism fungus kind injection rate is no more than 0.01PV in the range of single well-controlled, notes per hour
Enter amount and be 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 thing aqueous solution is saturation NH4HCO3The aqueous 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 present invention is advantageous in that：
One, this method have carried out multiple breaking block treatment to coal seam seepage channel, are more beneficial for coal seam air water and are split in hole
Flowing in seam, wherein second of de-plugging process product is methane, further increase coal bed gas content.
Secondly, inject ammonium bicarbonate aqueous solution after microorganism de-plugging, it injects coal seam and is thermally decomposed to generate CO2And NH3Category
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 action 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, improves methane output；And utilize microorganism coal
This property of change process heat release, generate ammonia for ammonium bicarbonate breaks down and carbon dioxide provides heat energy, avoid and coal seam is carried out
Extra heating.
Thirdly, product after the ammonium hydrogen carbonate that remains in coal seam water and microorganism incoalation etc. can be used as agriculture plant
The materials such as growth promoter, nonstaining property, ground produced water treatment flow can be facilitated.
Four, this method displacement source of the gas is air, cost-effective without any pollution, safe and efficient, is reached with the cost of minimum
The purpose of displacement is arrived so that production-increasing function area is bigger, while reduces the external strain for having desorbed subterranean zone, prevents strain
Largely multiplied in coal seam, destroy the prototype structure of coal, preferably kept coal seam prime stratum environment, ensure that follow-up colliery is opened
Adopt.
Five, the present invention is increased production using microbiological transformation technology and ammonium bicarbonate aqueous solution, and whole method was implemented
The continuous mining of producing well in journey, the continuity of mining is not interrupted, contributes to the exploitation of coal bed gas, low energy consumption simple with technique,
Pollution-free the advantages of waiting Technology development incomparable.
Brief description of the drawings
The spontaneous multicomponent gas displacement in coal seam of Fig. 1 present invention improves the process chart of coal bed gas recovery ratio.
Each step effect schematic diagram of Fig. 2 the inventive method, label in figure：Produce well 1, injection well 11, stratum 2, coal seam
3rd, coalification microorganism fungus kind sphere of action 4, coal solution degradation bacterium sphere of action 5, multicomponent gas displacement methane scope 6, injection are empty
Gas scope 7.
Embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein preferred real
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
A kind of method that spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio, its technological process is as shown in figure 1, tool
Body comprises the following steps：
The suitable volume increase target area of S1, first selection, the region should be the well group of the less well pattern improvement of well spacing, individual well
Gas production is relatively low, and seam construction is relatively flat, the preferable region of roof and floor seal.
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 in the range of single well-controlled,
Injection rate is no more than 6m per hour3.Coalification microorganism fungus kind injection coal seam had into 3 effects：Firstth, 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；Secondth, microorganism can be with molten
The coal dust and the pointed projections point and hole wall surface of hole wall easily degraded on solution coal seam hole wall, increase the area of seepage channel,
Increase coal seam permeability；3rd, the process of biosolubilization coal dust is an exothermic process, and big calorimetric is released in course of dissolution
Amount, increase coal seam temperature.Coal seam temperature is higher, is more advantageous to the desorption of methane gas in coal seam, increases gas well yield, meanwhile,
Coal seam temperature is higher, is more advantageous 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 degraded has phenols, carboxylic class, hydroxyl class, aldehyde
Water-soluble material such as class, also containing a small amount of insoluble complicated organic matter of macromolecular not soluble in water.The methagen of injection
Part insoluble matter can be degraded Deng coal solution processing bacterium, 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 degraded, dredges seepage channel, while degradation bacteria metabolism produces methane, increases coal seam first
Alkane content.
S5, by the angry thing aqueous solution injection by step S4 processing after coal seam in, the angry thing of injection is generally water-soluble
Liquid, the aqueous solution are easy to inject coal seam.Preferable angry thing is saturation NH4HCO3The aqueous solution, injection rate 0.05PV, inject pressure
Less than coal seam fracture pressure, Surface heat source should be completely cut off in injection process, prevents that the angry thing 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 more than 36 DEG C are decomposed into
CO2、NH3And H2O, 60 DEG C of decomposable asymmetric choice nets are complete, and reaction equation is：
S6, closing well head carry out stewing well processing, and it is 10~15 days to boil in a covered pot over a slow fire the well time.In the case of normal geothermal gradient, buried depth
800m coal seam temperature typically can reach more than 40 DEG C, plus (the hair of the molten coal of biology of heat caused by microorganism decomposition coal dust
The caloric value of heat and raw coal is roughly the same, about the 94%~97% of raw coal), coal seam temperature is enough the NH for making injection4HCO3Point
Solution produces substantial amounts 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 action effect between coal, adsorption capacity is far longer than the absorption of methane and coal
Ability.Therefore, NH3And CO2There is the methane gas that time enough displaces coal surface absorption, so that substantial amounts of methane fills
Decompose and inhale, methane gas is full of coal seam hole.
S7, after stewing well, into coal seam injecting air carries 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 stop gas injection.NH3And CO2The reaction for displacing methane gas all occurs near injection well,
And injection well distal end coal seam action effect is slower, injection air can be to the coalification microorganism above injected and the angry thing aqueous solution
Displacement is carried out, makes the increase of its sphere of action, the methane increase of displacement.Increase the pressure difference between injection well and producing well simultaneously, add
Fast coal seam fluid neuron network speed, improves methane output.
The spontaneous multicomponent gas displacement in coal seam that Fig. 2 concrete images depict the present invention improves each of coal bed gas recovery ratio method
Step acts on schematic diagram.
In summary, 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
The gas thing 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, generate methane gas 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 in the presence of the high temperature of coal seam and produces titanium dioxide
Carbon and ammonia, so as to improve methane output, and, low energy consumption simple with technique, it is pollution-free to wait Technology development not compare
The advantages of plan.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
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, as long as being the content without departing from technical solution of the present invention, the technical spirit according to the present invention
Any simple modification, equivalent change and modification made to above example, in the range of still falling within technical solution of the present invention.
Claims (8)
1. a kind of method that spontaneous multicomponent gas displacement in coal seam improves coal bed gas recovery ratio, it is characterised in that comprise 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 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 angry thing aqueous solution injection by step S4 processing after coal seam in；
S6, closing well head carry out stewing well processing；
S7, after stewing well, into coal seam injecting air carries out displacement.
2. the method that the spontaneous multicomponent gas displacement in coal seam as claimed in claim 1 improves coal bed gas recovery ratio, it is characterised in that
In the step S1, target area should be the well group of the less well pattern improvement of well spacing, and gas output per well is relatively low, and seam construction is more
It is flat, the preferable region of roof and floor seal.
3. the method that the spontaneous multicomponent gas displacement in coal seam as claimed in claim 2 improves coal bed gas recovery ratio, it is characterised in that
The coalification microorganism fungus kind injection rate is no more than 0.01PV in the range 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 claimed in claim 1 improves coal bed gas recovery ratio, it is characterised 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, it is characterised 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, it is characterised in that
The angry thing aqueous solution is saturation NH4HCO3The aqueous solution, injection rate 0.05PV, injection pressure are less 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, it is characterised 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, it is characterised 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108708692A (en) * | 2018-04-27 | 2018-10-26 | 太原理工大学 | A kind of method of biology in situ fluidization exploitation solid coal |
| CN111088971A (en) * | 2018-10-24 | 2020-05-01 | 中国石油化工股份有限公司 | Method for improving yield of common thick oil by utilizing heat produced by microbial fermentation |
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| US4411802A (en) * | 1981-09-08 | 1983-10-25 | Uop Inc. | Enhanced oil recovery |
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| CN111088971A (en) * | 2018-10-24 | 2020-05-01 | 中国石油化工股份有限公司 | Method for improving yield of common thick oil by utilizing heat produced by microbial fermentation |
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