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Method for constructing oil reservoir oil displacement microbial community to improve crude oil recovery ratio

A technology of oil displacement microbes and oil recovery, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of oil displacement function limitation, oil reservoir flora imbalance, flora loss and growth, etc., to achieve Improve pertinence and effectiveness, good reservoir adaptability, and strong operability

Active Publication Date: 2011-03-23
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

For a specific oil reservoir, due to the difference in formation conditions, one or several types of the above-mentioned microbial groups are missing or their growth is inhibited, resulting in an imbalance of the reservoir's bacterial flora and limiting its oil displacement function.

Method used

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  • Method for constructing oil reservoir oil displacement microbial community to improve crude oil recovery ratio

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Embodiment Construction

[0030] The method for constructing oil reservoir oil displacement microbial communities of the present invention to enhance oil recovery comprises the following contents:

[0031] Select a target oil reservoir, and carry out the following steps to construct the oil displacement microbial community in this oil reservoir.

[0032] (1) On-site sampling analysis

[0033] Select a sampler with a suitable capacity and a sealing rubber plug and a screw cap, clean it with distilled water, control the water, and sterilize it with high-pressure steam (121°C) for later use.

[0034] The sampling range of oil and water wells includes the injection water of water injection wells and the production water of oil wells in the test area. After fully replacing the air in the empty sampler with sterile nitrogen, take the oil-water sample so that the oil-water sample fills the sampler; start the test within 4 hours after sampling, and complete all the following test contents within 12 hours:

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Abstract

The invention relates to a microbial enhanced oil recovery technique, in particular to a method which is suitable for constructing an oil reservoir oil displacement microbial community to improve crude oil recovery ratio in the middle and later periods of a water-drive reservoir. The technical scheme is that the method for constructing the oil reservoir oil displacement microbial community comprises but is not limited to the following steps of: a, performing field sampling analysis on a target oil reservoir; b, determining a preliminary construction scheme according to field sampling test results; and c, optimizing the construction scheme by using a mixed culture experiment. The method has the following advantages that: (1) aiming at a specific oil reservoir, a targeted assessment is performed on oil reservoir microbial ecology to find out missed parts of a metabolic link, and the oil reservoir has high adaptability; and (2) the operability is strong. The method is used for adjusting the microbial community to evolve towards a target structure in a targeted mode, thereby improving the pertinence and the effectiveness of the field implementation of the oil recovery ratio by using microbes.

Description

1. Technical field: [0001] The invention relates to a microbial oil recovery technology, in particular to a method for constructing an oil-displacement microbial community in a water-displacement oil reservoir and increasing the oil recovery rate, which is suitable for the middle and late stages of water-displacement oil reservoirs. 2. Background technology: [0002] Microbial Enhanced Oil Recovery (MEOR) technology refers to the technology that uses microorganisms and / or their metabolites to increase crude oil production and recovery. Compared with other tertiary oil recovery technologies, MEOR technology has a wide range of applicable oil reservoirs Wide, simple construction technology, good economic benefits, no secondary pollution and other characteristics, more and more people's attention. The microbial EOR technology that has been formed at present is mainly divided into exogenous microbial oil flooding technology and endogenous microbial oil flooding technology. [0...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B49/08
Inventor 李希明郭省学宋永亭高光军汪卫东蒋焱王静李彩风宋欣郭辽原
Owner CHINA PETROLEUM & CHEM CORP
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