CN104790913B - Biological plug removal method for coal seam - Google Patents
Biological plug removal method for coal seam Download PDFInfo
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- CN104790913B CN104790913B CN201510209151.2A CN201510209151A CN104790913B CN 104790913 B CN104790913 B CN 104790913B CN 201510209151 A CN201510209151 A CN 201510209151A CN 104790913 B CN104790913 B CN 104790913B
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- Prior art keywords
- coal
- coal seam
- plugging
- microorganism
- crack
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- 239000003245 coal Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 26
- 244000005700 microbiome Species 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 22
- 230000037361 pathway Effects 0.000 claims abstract description 16
- 230000005012 migration Effects 0.000 claims abstract description 14
- 238000013508 migration Methods 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 13
- 230000015556 catabolic process Effects 0.000 claims abstract description 11
- 238000006731 degradation reaction Methods 0.000 claims abstract description 11
- 241000894006 Bacteria Species 0.000 claims abstract description 8
- 230000004060 metabolic process Effects 0.000 claims abstract description 8
- 230000000903 blocking effect Effects 0.000 claims description 26
- 235000015097 nutrients Nutrition 0.000 claims description 23
- 239000011159 matrix material Substances 0.000 claims description 21
- 230000006698 induction Effects 0.000 claims description 7
- 239000001963 growth medium Substances 0.000 claims description 6
- 235000016709 nutrition Nutrition 0.000 claims description 5
- 230000035764 nutrition Effects 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 4
- 230000000813 microbial effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000000638 stimulation Effects 0.000 claims description 4
- 239000012092 media component Substances 0.000 claims description 3
- 239000012533 medium component Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000005416 organic matter Substances 0.000 abstract description 4
- 230000029087 digestion Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 6
- 230000007062 hydrolysis Effects 0.000 abstract 1
- 238000006460 hydrolysis reaction Methods 0.000 abstract 1
- 230000003301 hydrolyzing effect Effects 0.000 abstract 1
- 238000012216 screening Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000000605 extraction Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000007640 basal medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Solid Fuels And Fuel-Associated Substances (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
The invention relates to a biological plug removal method for a coal seam, and belongs to a coal seam plug removal method. The biological plug removal method for the coal seam comprises the steps that digestion is conducted on plugging particles in a coal fracture through the adoption of the individual advantage of microorganism and special metabolism to the coal body of the microorganism, a fracture channel is expanded, the breathability of a coal body is improved, and plug removing and dredging of the coal seam fracture are achieved; during the implementation process of the prior art, a coalbed methane migration pathway is easy to be plugged, so that the breathability of the coal body is lowered, the exploitation efficiency of the coalbed methane is lowered, and gas control difficulty is improved; organic matter hydrolyzing bacteria and zymophyte with efficient hydrolysis are cultivated in the coal body through screening and expanding cultivation of the functional; the plugging particles are digested and the fracture pathway is expanded through the degradation function on the coal body of the biological metabolism, dredging of the plugging pathway of the coal seam is achieved, and the breathability of the coal body is improved. Chemical plug removal method which is heavy in pollution and high in governing cost can be replaced; through the safer and more efficient plug removing of the coal seam migration pathway, the exploitation level of the coalbed methane is improved, and the gas drainage effect is improved.
Description
Technical field
The present invention relates to a kind of coal seam method for removing blockage, particularly a kind of coal seam biological plugging releasing method.
Background technology
Good coal body breathability is the essential condition for ensureing coal-bed gas exploitation and gas control.Coal is a kind of with porous
Structure, enabling capabilities are weak, rock core is more crisp, a kind of complicated macromolecular structure for constituting is combined by organic matter and inanimate matter molecule
Body.Affected with geological conditions by construction technology during coal bed gas extraction, easily caused the stripping of coal body surface mass, caused micro-
The blocking in crack.This phenomenon will reduce coal body breathability, and the improvement for directly affecting coal bed gas extraction efficiency and gas is difficult
Degree.Blocked coal seam, it is many at present that crack passage is reconstructed using fracturing process.But limited by coal body feature, various pressure break de-pluggings
Measure is difficult to long-time and maintains the unimpeded of coal bed gas migration pathway.If therefore improving coal-bed gas exploitation stability and gas control water
Flat, one kind can in real time repair coalmass crevasse blocking, and persistence maintenance coal bed gas migration pathway is unimpeded, and passage de-plugging and passage
Maintenance does not interfere with the technical method of normal production in the urgent need to completing research and development.
The content of the invention
The invention aims to provide one kind and can keep unimpeded coal bed gas migration pathway, the exploitation of regular coal seam gas, be lifted
The coal seam biological plugging releasing method of gas control level.
Technical scheme：For achieving the above object, the technical solution used in the present invention is：
The method for removing blockage：Individual dominance using microorganism is with the special metabolism to coal body to cleat in coal blocking particles
Digested, extension crack passage, lifting coal body breathability realize that cracks in coal seam de-plugging is dredged；
First, strain induction is implemented to target coal seam and is spread cultivation；Using eutrophy culture medium, micropopulation is lured
Lead, the liveness and reproduction speed of the matrix of coal degraded strain in acceleration flora, the quantity for making matrix of coal degradation bacteria reaches 108With
On；
Second, the supply of supplementary nutrients is strengthened to blocking region；Congested areas are strengthened with supply except matrix of coal can be carried
For nutrient outside supplementary nutrients；Using this kind of method, microorganism is promoted to improve the utilization rate to matrix of coal with drop
Solution speed；
3rd, biological plugging releasing；Microorganism can be ramped up to matrix of coal using effect under the stimulation of enough nutrients
Rate；With degraded of the microorganism to blocking particles, blocking particles particle diameter is gradually reduced, when reducing to a certain extent, you can pass through
Realize de-plugging in crack；Simultaneously with degraded of the microorganism to crack both sides ature of coal, Fracture Width also progressively extends；When crack expansion
To a certain extent, original shape can complete de-plugging into the granule of blocking by crack；
4th, the stable and coal bed gas migration pathway of strain is stablized；When cracks in coal seam completes de-plugging target, coal seam is noted
Enter culture medium concentration to be adjusted, the supply basic nutrition element of controlling, reduce microbial activity, stable strain；Make control
During strain afterwards is according to normal active state activity and coal seam, while realizing the stable effect of coal bed gas migration pathway.
The medium component of induction is as follows：
Supplementary nutrients composition is as follows：
Basic media components are as follows
Beneficial effect, as a result of such scheme, the microorganism of directive breeding has more special coal base organic matter
Degradation capability, can complete vital movement with the organic component in coal as nutrient source.Meanwhile, this quasi-microorganism individuality is small,
Can enter in coal body microfissure and play biological plugging releasing function.Using the metabolism of this kind of microorganism is unique and individual character,
The microorganism induction is played a role to coalmass crevasse blocking region under artificial control.It is obstruction using microorganism dredging obstruction
The result of dual function is expanded in grain digestion with crack.Organic composition first in blocking particles can by microorganism fast degradation,
Blocking particles are decomposed into into some little particles so as to crack passage can be passed through and complete de-plugging；The metabolism of microorganism simultaneously
Also synchronization, in both sides rib, is expanded with microorganism to the degraded coalmass crevasse of coal body surface organic matter for effect, increases
The solid particle passability in crack and coal body breathability.
Advantage：
1st, the technical method utilizes metabolism of the microorganism to coal body, cleat in coal blocking particles is digested, between extension crack
Gap, dredging coal seam blocking realizes that de-plugging is acted on；
2nd, biological technique method is utilized, enable that the sphere of action of the technology is applied to that microorganism can enter any splits
Gap region；
3rd, de-plugging process and coal bed gas extraction process are synchronously carried out, and the biological plugging releasing in coal seam does not affect gas field extraction operation；
4th, with the abundance and concentration of nutrient be main control mode can the convenient activity to microorganism carry out in real time
Control；
5th, when the region after de-plugging can make matrix of coal degrading microorganism survive considerably long by stabilised microorganism liveness
Between, biological plugging releasing function can in time, be easily started when needing to be again carried out de-plugging；
6th, the microorganism after stable can play a part of regular coal seam gas migration pathway, when have new blocking to occur when
Wait, the microorganism in the region can be responded in time.
The plugging removal effect that compensate for the presence of traditional coal seam method for removing blockage using biotechnology method is undesirable, technology reality
The technological gap that difficulty is big, controlling is poor, affect normal production is applied, is lifting and the Mine Safety Technology of Coal-seam Gas Recovery Technologies
Development lay a good foundation.
Description of the drawings：
Fig. 1 is coal seam biological plugging releasing technical scheme flow chart.
Specific embodiment
Embodiment 1：The method for removing blockage：Individual dominance using microorganism is with the special metabolism to coal body to cleat in coal
Blocking particles are digested, extension crack passage, lifting coal body breathability, realize that cracks in coal seam de-plugging is dredged；
First, strain induction is implemented to target coal seam and is spread cultivation：Using eutrophy culture medium, micropopulation is lured
Lead, the liveness and reproduction speed of the matrix of coal degraded strain in acceleration flora, the quantity for making matrix of coal degradation bacteria reaches 108With
On；
Second, the supply of supplementary nutrients is strengthened to blocking region：Congested areas are strengthened with supply except matrix of coal can be carried
For nutrient outside supplementary nutrients；Using this kind of method, microorganism is promoted to improve the utilization rate to matrix of coal with drop
Solution speed；
3rd, biological plugging releasing：Microorganism can be ramped up to matrix of coal using effect under the stimulation of enough nutrients
Rate；With degraded of the microorganism to blocking particles, blocking particles particle diameter is gradually reduced, when reducing to a certain extent, you can pass through
Realize de-plugging in crack；Simultaneously with degraded of the microorganism to crack both sides ature of coal, Fracture Width also progressively extends；When crack expansion
To a certain extent, original shape can complete de-plugging into the granule of blocking by crack；
4th, the stable and coal bed gas migration pathway of strain is stablized：When cracks in coal seam completes de-plugging target, coal seam is noted
Enter culture medium concentration to be adjusted, the supply basic nutrition element of controlling, reduce microbial activity, stable strain；Make control
During strain afterwards is according to normal active state activity and coal seam, while realizing the stable effect of coal bed gas migration pathway.
The specific embodiment of coal seam biological plugging releasing technology is as follows：
First, target coal seam microorganism structure is implemented to induce；Eutrophic inducing culture is injected in coal body, is monitored
De-plugging subterranean zone microbial activitiess situation.The variable quantity of the carbon dioxide of gas-producing well extraction gas is monitored first, after stablizing
Gas concentration lwevel should be maintained at 5~10 times of original concentration；The concentration of acetate, the second after stablizing in monitoring extraction well water sample
Acid group content should be 20~30 times of original concentration.
The medium component of induction is as follows：
Secondth, the cultivation of matrix of coal degradation bacteria is carried out；Matrix of coal degradation bacteria in the extraction well water sample of monitoring de-plugging subterranean zone
Content, the quantity for making matrix of coal degradation bacteria reaches 108More than.
3rd, supplementary nutrients supply, degradation capability of the enhancement microbiological to coal body；When breeding strain reaches requirement, stop
Only inducing culture injection, is changed to the supply of supplementary nutrients.The major function of supplementary nutrients is supplied with except coal base can be provided
Major Nutrient source outside other nutrients, improve matrix of coal degradation bacteria the digestion power to coal body.
Supplementary nutrients composition is as follows：
4th, implement biological plugging releasing；Under continuing the stimulation of enough nutrients that aid nutrition is provided, it is right to ramp up
The utilization ratio of matrix of coal.With degraded of the microorganism to blocking particles, blocking particles particle diameter is gradually reduced, certain when being reduced to
Degree, you can de-plugging is realized by crack.Simultaneously with degraded of the microorganism to crack both sides ature of coal, Fracture Width also progressively expands
Exhibition.When crack is expanded to a certain extent, original shape can complete de-plugging into the granule of blocking by crack.
5th, the stable and coal bed gas migration pathway of strain is stablized；When cracks in coal seam completes de-plugging target, coal seam is noted
Enter culture medium concentration to be adjusted, switch to inject basal medium, the supply basic nutrition element of controlling reduces microorganism and lives
Property, stable strain.The strain after control is set to survive in coal seam with relatively low liveness, while realizing that coal bed gas migration pathway is steady
Fixed effect.
Basic media components are as follows
Claims (2)
1. a kind of coal seam biological plugging releasing method, is characterized in that：The method for removing blockage：Using microorganism individual dominance with to coal body
Special metabolism digests to cleat in coal blocking particles, extension crack passage, lifting coal body breathability, realizes cracks in coal seam
De-plugging is dredged；
First, strain induction is implemented to target coal seam and is spread cultivation；Using eutrophy culture medium, micropopulation is induced, plus
The liveness and reproduction speed of the matrix of coal degraded strain in fast flora, the quantity for making matrix of coal degradation bacteria reaches 108More than；
Second, the supply of supplementary nutrients is strengthened to blocking region；Congested areas are strengthened with supply and removes what matrix of coal can be provided
Supplementary nutrients outside nutrient；Using this kind of method, microorganism is promoted to improve the utilization rate to matrix of coal with degraded speed
Rate；
3rd, biological plugging releasing；Microorganism can ramp up the utilization ratio to matrix of coal under the stimulation of enough nutrients；
With degraded of the microorganism to blocking particles, blocking particles particle diameter is gradually reduced, when reducing to a certain extent, you can by crack
Realize de-plugging；Simultaneously with degraded of the microorganism to crack both sides ature of coal, Fracture Width also progressively extends；When crack is expanded to one
Determine degree, original shape can complete de-plugging into the granule of blocking by crack；
4th, the stable and coal bed gas migration pathway of strain is stablized；When cracks in coal seam completes de-plugging target, coal seam injection is trained
Foster base concentration is adjusted, the supply basic nutrition element of controlling, reduces microbial activity, stable strain；After making control
During strain is according to normal active state activity and coal seam, while realizing the stable effect of coal bed gas migration pathway.
2. a kind of coal seam biological plugging releasing method according to claim 1, is characterized in that：
The medium component of induction is as follows：
Supplementary nutrients composition is as follows：
Basic media components are as follows
。
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1492238A (en) * | 1976-06-23 | 1977-11-16 | Moskov Gor Inst | Method for reducing gas and dust emission from a coal sea |
| US5424195A (en) * | 1990-06-20 | 1995-06-13 | Secretary Of The Interior | Method for in situ biological conversion of coal to methane |
| US7556094B1 (en) * | 2005-10-31 | 2009-07-07 | University Of Wyoming | Method for converting coal to biogenic methane |
| CN101839126A (en) * | 2010-03-25 | 2010-09-22 | 西安石油大学 | Method for increasing production by compounding microorganism and biologically active agent |
| CN102373037A (en) * | 2010-08-10 | 2012-03-14 | 中国石油化工集团公司 | Novel biological blockage removing solution for well completion, and production method thereof |
| CN102443384A (en) * | 2011-11-10 | 2012-05-09 | 西安瑞捷生物科技有限公司 | Biological blocking remover and preparation method thereof |
| CN102504785A (en) * | 2011-11-10 | 2012-06-20 | 西安瑞捷生物科技有限公司 | Biological blocking remover for oil fields |
| CN102900411A (en) * | 2012-10-29 | 2013-01-30 | 河南理工大学 | Biological permeability-increasing method for coal reservoir |
| CN104295276A (en) * | 2014-07-29 | 2015-01-21 | 太原理工大学 | Method for improving coalbed methane collection rate |
-
2015
- 2015-04-28 CN CN201510209151.2A patent/CN104790913B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1492238A (en) * | 1976-06-23 | 1977-11-16 | Moskov Gor Inst | Method for reducing gas and dust emission from a coal sea |
| US5424195A (en) * | 1990-06-20 | 1995-06-13 | Secretary Of The Interior | Method for in situ biological conversion of coal to methane |
| US7556094B1 (en) * | 2005-10-31 | 2009-07-07 | University Of Wyoming | Method for converting coal to biogenic methane |
| CN101839126A (en) * | 2010-03-25 | 2010-09-22 | 西安石油大学 | Method for increasing production by compounding microorganism and biologically active agent |
| CN102373037A (en) * | 2010-08-10 | 2012-03-14 | 中国石油化工集团公司 | Novel biological blockage removing solution for well completion, and production method thereof |
| CN102443384A (en) * | 2011-11-10 | 2012-05-09 | 西安瑞捷生物科技有限公司 | Biological blocking remover and preparation method thereof |
| CN102504785A (en) * | 2011-11-10 | 2012-06-20 | 西安瑞捷生物科技有限公司 | Biological blocking remover for oil fields |
| CN102900411A (en) * | 2012-10-29 | 2013-01-30 | 河南理工大学 | Biological permeability-increasing method for coal reservoir |
| CN104295276A (en) * | 2014-07-29 | 2015-01-21 | 太原理工大学 | Method for improving coalbed methane collection rate |
Non-Patent Citations (1)
| Title |
|---|
| 不同煤阶煤的微生物增透效果和机理分析;郭红玉等;《煤炭学报》;20141009(第9期);第1886页 * |
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