A microbial enhanced oil recovery method for improving waterflood recovery

By applying power-generating microorganisms in oil reservoirs, combined with oil-water separation and interfacial tension reduction, the problems of narrow scope and high cost of microbial enhanced oil recovery technology have been solved, achieving efficient oil-water separation and improved recovery rate.

CN122190704APending Publication Date: 2026-06-12CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-11
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing microbial enhanced oil recovery technologies suffer from problems such as narrow scope of application, high cost, complex mechanism, poor reservoir adaptability, and large evaluation workload. Furthermore, microbial power generation efficiency is low, which cannot effectively expand the oil-water separation range.

Method used

By employing power-generating microorganisms to generate electricity in oil reservoirs, combined with oil-water separation and interfacial tension reduction, and by screening suitable reservoirs, power-generating microorganisms, and nutrient solutions, the injection volume and injection process are determined to achieve oil-water separation and reduce interfacial tension, thereby expanding the reservoir adaptability range.

Benefits of technology

It has achieved significant improvements in reservoir recovery, reduced costs, expanded applicability, simple operation, remarkable results, and a high input-output ratio.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of microbial oil recovery methods for improving water drive oil reservoir recovery efficiency, comprising the following steps: (1) selection of test reservoirs;(2) selection of power generation function microorganisms;(3) selection of nutrient solution;(4) determination of on-site injection process;(5) field test and effect evaluation.The application has the following beneficial effects: (1) convenient and easy to operate, low cost, high utilization rate, low dosage;(2) less affected by the properties of crude oil and oil-water distribution, good effect;(3) microorganisms can enter the deep part of the oil reservoir, improve the range of use, and realize sustained separation;(4) reduce the workload of microbial oil recovery evaluation, and the technology is adjustable and controllable;(5) the range of field reservoir application is greatly improved, the implementation effect is good, and the input-output ratio is greater than 1:10.
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