Preparation method of biological fracturing fluid for coal bed methane well

A coalbed methane well and fracturing fluid technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve reservoir damage, large displacement, poor sand-carrying ability of active water fracturing fluid, etc. problems, to achieve the effect of increasing the success rate, increasing the penetration rate, and increasing the amount of resources

Inactive Publication Date: 2014-07-30
HENAN POLYTECHNIC UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] As an important means of reviving dead wells, fracturing has been confirmed and used by many scholars, and the quality of fracturing fluid is directly related to the success or failure of fracturing. At present, active water fracturing fluid, frozen Gel fracturing fluid and foam fracturing fluid, but active water fracturing fluid has poor sand-carrying ability and large displacement; gel fracturing fluid is difficult to completely break the gel and is easy to cause damage to the reservoir; the cost of foam fracturing fluid High and supporting facilities are not perfect

Method used

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preparation example Construction

[0021] The preparation method of biological fracturing fluid for coalbed gas wells of the present invention comprises the following steps,

[0022] (1) Screening of hydrogen-producing bacteria and methanogenic bacteria: use two culture media in the laboratory to screen out hydrogen-producing bacteria and methanogenic bacteria in the original microorganisms of dead wells to be transformed;

[0023] (2) Domestication of relevant bacteria: According to the reservoir environment of the well to be transformed, screen, isolate and domesticate the corresponding strains to make them efficient hydrogen-producing bacteria and methanogens that can adapt to the reservoir environment of the well to be transformed. Record its growth curve and store it at low temperature;

[0024] (3) Enrich bacteria to make liquid A and liquid B: add the hydrogen-producing bacteria isolated and extracted in the laboratory to the above-mentioned medium for enrichment for 3-6 days, adjust the pH to 6.5, and u...

Embodiment 1

[0036]A coalbed methane well that has lost its economic exploitation value in the Qinshui Basin took reservoir water samples and coal samples and sealed them for preservation. In the laboratory, two culture media HPU-1 and HPU-2 cultivated in the laboratory were used to screen out hydrogen-producing bacteria and methanogenic bacteria in the original microorganisms of the well; according to the reservoir environment of the well, screened, isolated and Domesticate the corresponding strains to make them efficient hydrogen-producing bacteria and methanogenic bacteria that can adapt to the reservoir environment of the well to be transformed, record their growth curves, and store them at low temperature; add hydrogen-producing bacteria to HPU-1 at the construction site The culture medium is enriched for 3-6 days, adjust the pH to 6.5, press it into the well as liquid A, keep it for at least 7 days, and then flow back to produce gas. After a period of time, the gas production continue...

Embodiment 2

[0038] A CBM well in the Qinshui Basin has lost its economic exploitation value, but it was found that there is a large difference between the exploited volume and the recoverable reserves. Take reservoir water samples and coal samples and seal them for preservation. In the laboratory, using two culture media HPU-1 and HPU-2 cultivated in the laboratory, the hydrogen-producing bacteria and methanogenic bacteria in the original microorganisms of the well were screened out; according to the reservoir environment of the well, screened, isolated and domesticated Corresponding strains to make them highly efficient hydrogen-producing bacteria and methanogenic bacteria that can adapt to the reservoir environment of the well to be reformed, record their growth curves, and store them at low temperature; at the construction site, add hydrogen-producing bacteria to HPU-1 for cultivation Base enrichment for 6-10 days, adjust the pH to 6.5, press it into the well as liquid A for transforma...

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Abstract

A preparation method of biological fracturing fluid for coal bed methane wells comprises the following steps: (1) screening hydrogenogens and methanogens; (2) acclimatizing related bacteria; (3) enriching the bacteria to prepare A liquid and B liquid, that is, adding the hydrogenogens separated and extracted in laboratory into a culture medium for enrichment for 3-6 days, adjusting the pH to 6.5 to obtain the A liquid, adding the methanogens into another culture medium for enrichment for 20-30 days, adjusting the pH to 7 to obtain the B liquid; (4) adding the A liquid and the B liquid in order according to on-site parameters. The mixed-bacteria fermented biological fracturing fluid prepared in the invention has certain sand-carrying capability; the bacteria in the fluid have hydrogen-producing and methane-producing capability, can not only increase the coal reservoir permeability, increase the coal bed methane resource amount, but also realize automatic viscosity reduction, and facilitate flow back. Residual hydrogenogens and methanogens after flow back can transform coal reservoirs continuedly, and generate biogenic coal bed methane continuously.

Description

technical field [0001] The invention belongs to the technical field of coalbed gas well exploitation, and in particular relates to a preparation method of a biological fracturing fluid for coalbed gas wells that can increase the gas production of coalbed gas wells. Background technique [0002] Coal bed gas is commonly known as "gas". Its main component is CH4 (methane). It is an unconventional natural gas associated with coal and stored in the coal seam in an adsorbed state. The calorific value is 2-5 times that of general coal, and the main component is methane. The calorific value of 1 cubic meter of pure coalbed methane is equivalent to 1.13kg of gasoline and 1.21kg of standard coal, and its calorific value is equivalent to that of natural gas. Industrial, chemical, power generation and residential fuel. When the air concentration of coalbed methane reaches 5%-16%, it will explode when encountering an open flame, which is the root cause of coal mine gas explosion accide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C09K8/66E21B43/26
Inventor 夏大平司青郭红玉苏现波罗源陈山来张士伟王振
Owner HENAN POLYTECHNIC UNIV
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