CN104790913A - Biological plug removal method for coal seam - Google Patents
Biological plug removal method for coal seam Download PDFInfo
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- CN104790913A CN104790913A CN201510209151.2A CN201510209151A CN104790913A CN 104790913 A CN104790913 A CN 104790913A CN 201510209151 A CN201510209151 A CN 201510209151A CN 104790913 A CN104790913 A CN 104790913A
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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 gas permeability is the necessary condition ensureing coal-bed gas exploitation and gas control.Coal be a kind of there is loose structure, enabling capabilities is weak, rock core is more crisp, by the macromolecular structure body of the organic a kind of complexity formed with inanimate matter molecule compound.Affect by construction technology and geological conditions in coal bed gas extraction process, very easily cause the stripping of coal body surface mass, cause the blocking of microfissure.This phenomenon will make coal body gas permeability reduce, and directly affect the difficulty of governance of coal bed gas extraction efficiency and gas.Blocked coal seam, the fracturing process that adopts reconstructs crack passage more at present.But limit by coal body feature, various pressure break breaking block treatment is difficult to maintain the unimpeded of coal bed gas migration pathway for a long time.If therefore improve coal-bed gas exploitation stability and gas control level, one can repair coalmass crevasse blocking in real time, persistence maintenance coal bed gas migration pathway is unimpeded, and passage de-plugging and passage safeguard that the technical method that can not affect and normally produce is in the urgent need to completing research and development.
Summary of the invention
The object of the invention is to provide a kind of and can keep that coal bed gas migration pathway is unimpeded, the exploitation of regular coal seam gas, promote 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:
This method for removing blockage: utilize the individual dominance of microorganism and the special metabolism of coal body is digested cleat in coal blocking particles, expansion crack passage, lifting coal body gas permeability, realize cracks in coal seam de-plugging dredging;
The first, target coal seam is implemented bacterial classification induction and spread cultivation; Adopt enrich media, micropopulation is induced, accelerate liveness and the reproduction speed of the matrix of coal degraded bacterial classification in flora, make the quantity of matrix of coal degradation bacteria reach 10
8above;
The second, blocking region is strengthened to the supply of aid nutrition element; The aid nutrition element of supply except the nutrient that matrix of coal can provide is strengthened to congested areas; Utilize this kind of method, impel microorganism raising to the utilization rate of matrix of coal and degradation rate;
3rd, biological plugging releasing; Microorganism, under the stimulation of enough nutrients, can accelerate the utilization ratio to matrix of coal gradually; With microorganism to the degraded of blocking particles, blocking particles particle diameter reduces gradually, when being reduced to a certain degree, namely realizes de-plugging by crack; Adjoint microorganism is to the degraded of both sides, crack ature of coal simultaneously, and Fracture Width is also progressively expanded; When crack is expanded to a certain degree, original shape becomes the particle of blocking namely by crack, completes de-plugging;
4th, stablizing of bacterial classification and stablizing of coal bed gas migration pathway; When cracks in coal seam completes de-plugging target, coal seam is injected culture medium concentration and adjust, the supply basic nutrition element of controlling, reduce microbial activity, stablize bacterial classification; Make the bacterial classification after control according in normal active state activity and coal seam, realize the effect that coal bed gas migration pathway is stable simultaneously.
The medium component of induction is as follows:
Aid nutrition element composition is as follows:
Basic media components is as follows
Beneficial effect, owing to have employed such scheme, the microorganism of directive breeding has comparatively special coal-based organic matter degradation ability, can with the organic component in coal for nutrient source completes vital movement.Meanwhile, this quasi-microorganism individuality is small, can enter in coal body microfissure and play biological plugging releasing function.Utilize metabolism uniqueness and the individual character of this kind of microorganism, under manual control this microorganism induction is played a role to coalmass crevasse blocking region.Utilize microorganism to dredge blocking is that blocking particles digestion expands the result of double action with crack.Blocking particles by microorganism fast degradation, can be decomposed into some granules by the organic composition first in blocking particles, can complete de-plugging smoothly by crack passage; Also synchronous effect is in both sides rib for the metabolism of microorganism simultaneously, and adjoint microorganism is expanded the degraded coalmass crevasse that coal body surface is organic, increases solid particle passability and the coal body gas permeability in crack.
Advantage:
1, this technical method utilizes microorganism to the metabolism of coal body, digestion cleat in coal blocking particles, expansion gap, crack, and the blocking of dredging coal seam, realizes de-plugging effect;
2, biological technique method is utilized, any gap region enabling the sphere of action of this technology be applied to microorganism can to enter;
3, de-plugging process and coal bed gas extraction course synchronization carry out, and the biological plugging releasing in coal seam does not affect gas field extraction operation;
4, with the abundance of nutrient and concentration for major control mode can the convenient activity to microorganism control in real time;
5, the region after de-plugging can make matrix of coal degrading microorganism survive the long duration by stabilised microorganism liveness, can start biological plugging releasing function in time, easily when de-plugging implemented again by needs;
6, the microorganism after stablizing can play the effect of regular coal seam gas migration pathway, and in time having new blocking to occur, the microorganism in this region can make response in time.
Utilize biotechnology method compensate for traditional coal seam method for removing blockage exist plugging removal effect undesirable, technology implements the technological gap that difficulty is large, controlling is poor, impact is normally produced, for the lifting of Coal-seam Gas Recovery Technologies and the development of Mine Safety Technology are laid a good foundation.
Accompanying drawing illustrates:
Fig. 1 is coal seam biological plugging releasing technical scheme flow chart.
Detailed description of the invention
Embodiment 1: this method for removing blockage: utilize the individual dominance of microorganism and the special metabolism of coal body is digested cleat in coal blocking particles, expansion crack passage, lifting coal body gas permeability, realize cracks in coal seam de-plugging dredging;
The first, target coal seam is implemented bacterial classification induction and spread cultivation: adopts enrich media, micropopulation is induced, accelerate liveness and the reproduction speed of the matrix of coal degraded bacterial classification in flora, make the quantity of matrix of coal degradation bacteria reach 10
8above;
The second, blocking region is strengthened to the supply of aid nutrition element: the aid nutrition element of supply except the nutrient that matrix of coal can provide is strengthened to congested areas; Utilize this kind of method, impel microorganism raising to the utilization rate of matrix of coal and degradation rate;
3rd, biological plugging releasing: microorganism, under the stimulation of enough nutrients, can accelerate the utilization ratio to matrix of coal gradually; With microorganism to the degraded of blocking particles, blocking particles particle diameter reduces gradually, when being reduced to a certain degree, namely realizes de-plugging by crack; Adjoint microorganism is to the degraded of both sides, crack ature of coal simultaneously, and Fracture Width is also progressively expanded; When crack is expanded to a certain degree, original shape becomes the particle of blocking namely by crack, completes de-plugging;
4th, stablizing of bacterial classification and stablizing of coal bed gas migration pathway: when cracks in coal seam completes de-plugging target, coal seam is injected culture medium concentration and adjust, the supply basic nutrition element of controlling, reduce microbial activity, stablize bacterial classification; Make the bacterial classification after control according in normal active state activity and coal seam, realize the effect that coal bed gas migration pathway is stable simultaneously.
The detailed description of the invention of coal seam biological plugging releasing technology is as follows:
First, induction is implemented to target coal seam microorganism structure; Eutrophic inducing culture is injected, monitoring de-plugging subterranean zone microbial activities situation in coal body.First monitor the variable quantity of the carbon dioxide of gas-producing well extraction gas, the gas concentration lwevel after stable should remain on 5 ~ 10 times of original concentration; The concentration of acetate in monitoring extraction well water sample, the Determination of Ac after stable should be 20 ~ 30 times of original concentration.
The medium component of induction is as follows:
The second, the cultivation of matrix of coal degradation bacteria is carried out; In the extraction well water sample of monitoring de-plugging subterranean zone, the content of matrix of coal degradation bacteria, makes the quantity of matrix of coal degradation bacteria reach 10
8above.
Three, aid nutrition element supply, enhancement microbiological is to the degradation capability of coal body; When breeding strain reaches requirement, stop inducing culture injecting, change the supply of aid nutrition element into.The major function of aid nutrition element is supply other nutrients except coal-based available Major Nutrient source, improves the digestion power to coal body of matrix of coal degradation bacteria.
Aid nutrition element composition is as follows:
4th, implement biological plugging releasing; Under the stimulation of enough nutrients that lasting aid nutrition provides, the utilization ratio to matrix of coal can be accelerated gradually.With microorganism to the degraded of blocking particles, blocking particles particle diameter reduces gradually, when being reduced to a certain degree, namely realizes de-plugging by crack.Adjoint microorganism is to the degraded of both sides, crack ature of coal simultaneously, and Fracture Width is also progressively expanded.When crack is expanded to a certain degree, original shape becomes the particle of blocking namely by crack, completes de-plugging.
5th, stablizing of bacterial classification and stablizing of coal bed gas migration pathway; When cracks in coal seam completes de-plugging target, coal seam is injected culture medium concentration and adjust, transfer injection basal medium to, the supply basic nutrition element of controlling, reduce microbial activity, stablize bacterial classification.Make the bacterial classification after control survive in coal seam with lower liveness, realize the effect that coal bed gas migration pathway is stable simultaneously.
Basic media components is as follows
Claims (2)
1. a coal seam biological plugging releasing method, it is characterized in that: this method for removing blockage: utilize the individual dominance of microorganism and the special metabolism of coal body is digested cleat in coal blocking particles, expansion crack passage, lifting coal body gas permeability, realize cracks in coal seam de-plugging dredging;
The first, target coal seam is implemented bacterial classification induction and spread cultivation; Adopt enrich media, micropopulation is induced, accelerate liveness and the reproduction speed of the matrix of coal degraded bacterial classification in flora, make the quantity of matrix of coal degradation bacteria reach 10
8above;
The second, blocking region is strengthened to the supply of aid nutrition element; The aid nutrition element of supply except the nutrient that matrix of coal can provide is strengthened to congested areas; Utilize this kind of method, impel microorganism raising to the utilization rate of matrix of coal and degradation rate;
3rd, biological plugging releasing; Microorganism, under the stimulation of enough nutrients, can accelerate the utilization ratio to matrix of coal gradually; With microorganism to the degraded of blocking particles, blocking particles particle diameter reduces gradually, when being reduced to a certain degree, namely realizes de-plugging by crack; Adjoint microorganism is to the degraded of both sides, crack ature of coal simultaneously, and Fracture Width is also progressively expanded; When crack is expanded to a certain degree, original shape becomes the particle of blocking namely by crack, completes de-plugging;
4th, stablizing of bacterial classification and stablizing of coal bed gas migration pathway; When cracks in coal seam completes de-plugging target, coal seam is injected culture medium concentration and adjust, the supply basic nutrition element of controlling, reduce microbial activity, stablize bacterial classification; Make the bacterial classification after control according in normal active state activity and coal seam, realize the effect that coal bed gas migration pathway is stable simultaneously.
2. a kind of coal seam according to claim 1 biological plugging releasing method, is characterized in that:
The medium component of induction is as follows:
Aid nutrition element composition is as follows:
Basic media components is as follows
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112696184A (en) * | 2021-03-24 | 2021-04-23 | 四川省威沃敦化工有限公司 | Fracturing construction method for oil and gas well |
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| CN112696184A (en) * | 2021-03-24 | 2021-04-23 | 四川省威沃敦化工有限公司 | Fracturing construction method for oil and gas well |
| CN112696184B (en) * | 2021-03-24 | 2021-06-22 | 四川省威沃敦化工有限公司 | Fracturing construction method for oil and gas well |
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