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Method for estimating capability of edge-water encroachment of microbe

A technology for microbial oil flooding and microorganisms, which is applied in earth-moving drilling, fluid production, wellbore/well components, etc. Such problems as screening errors, etc., to achieve the effect of reliable evaluation

Inactive Publication Date: 2004-10-27
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0007] It can be seen that the evaluation method of microbial oil displacement ability currently used is to end the experiment after water flooding after the core is sealed and cultivated for a short time. This evaluation method has many disadvantages: such as short cultivation time, no nutrient solution supplement, no Considering the effect of microbial flooding time delay, low microbial concentration cannot reflect the oil displacement effect after microbial reproduction and fermentation, etc., so it does not fully reflect the ability of microbial flooding
This not only affects the accurate evaluation of the concentration of microbial inoculation, selection of nutrient solution, and microbial oil displacement ability, but even causes great errors in judging the performance of microorganisms and strain screening; Determination and optimization of key parameters of field tests, such as microbial injection concentration, etc., as well as prediction and early evaluation of test effects

Method used

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Examples

Experimental program
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Embodiment 1

[0021] Using artificial heterogeneous core, the water phase permeability is 0.6μm 2 , the displacement water is sterilized injection water from an oil field, and the nutrient solution is prepared from displacement water (ingredient: NH 4 Cl: 0.3%, K 2 HPO 4 : 0.1%, yeast extract 0.05%, wt%), the displacement speed is 5m / d.

[0022] The core was saturated with water, crude oil was displaced to irreducible water saturation, injected water was displaced to residual oil saturation, and then transferred to Bacillus subtilis (Makkar RS, Cameotra S S. Production of biosurfactant atmesophilic and thermophilic conditions by a strain of Bacillus subtilis. J.Ind.Microbiol.Biotechnol., 20 (1), 48-52, 1998, Bacillus subtilis B.subtilis) fermented liquid (dilute to concentration 5% with nutrient solution) 1PV (PV, the pore volume of test rock core), Seal both ends of the core and let it stand for 5 days at the experimental temperature of 37°C.

[0023] According to the prior art method,...

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Abstract

A method for evaluating the oil displacing power of microbes includes filling the saline rich in nutrients and microbes in the bore bearing the residual oil after water displacement, slealing the both ends of said bore for culturing microbes, displacing to output fluid, repeating previous two steps utile no crude oil can be recovered, and calculating the ampletude of the covered rate of crude oil displaced by microbes.

Description

technical field [0001] The invention relates to an evaluation method, in particular to an evaluation method of microbial oil displacement ability in the process of oil field exploitation. Background technique [0002] Microbial flooding is an economical and effective technology for enhanced oil recovery, and the research on this technology began in the 1920s. In 1926, Buickman first proposed the idea of ​​"using microbes to enhance oil recovery in oil reservoirs"; in 1940, Zobel discovered that microbes could release oil from rock cores, and in 1946, together with the American Petroleum Institute, obtained a patent certificate The patent for gas bacteria injection into oil reservoirs; since 1954, mine field tests have been carried out successively in some Eastern European countries such as the former Soviet Union, Poland, Hungary, and Czechoslovakia. Since the 1980s, countries around the world have paid more and more attention to microbial oil recovery technology, and labor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 牟伯中刘金峰
Owner EAST CHINA UNIV OF SCI & TECH
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