Method for recycling functional bacteria for thickened oil recovery

By determining the matching functional bacteria in heavy oil extraction and recycling, the problems of low heavy oil extraction efficiency and short effective period of microbial oil repellent technology are solved, and efficient collection of heavy oil and the large-scale application of microbial oil repellent technology are achieved.

CN119709157AActive Publication Date: 2025-03-28PETROCHINA CO LTD
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Patent Information

Application Number
CN202311255404.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-26
Publication Date
2025-03-28
Estimated Expiration
2043-09-26

AI Technical Summary

Technical Problem

In the prior art, heavy oil extraction efficiency is low, and the microbial oil repellent technology has the problem of rapid decline in bacterial activity and short validity period, so it cannot be further applied on a large scale.

Method used

By determining the functional bacteria that match the viscosity-causing components of heavy oil, and using the reservoir production solution as raw material to cultivate the targeted culture medium, functional bacteria and targeted culture medium are injected into the reservoir, and functional bacteria are detected and supplemented in real time to form dominant bacterial groups to improve production efficiency.

Benefits of technology

The expected effects of heavy oil reducing viscosity, increasing oil and improving recovery rate are achieved, the activity cycle of functional bacteria is extended, and the large-scale application effect of microbial oil repellent is improved.

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Abstract

The invention provides a cyclic utilization method of functional bacteria for thickened oil recovery. The cyclic utilization method comprises the following steps: determining functional bacteria matched with viscosity-causing components of thickened oil; taking the oil reservoir produced liquid as a raw material, and culturing a targeted culture medium corresponding to the functional bacteria; injecting the functional bacteria and the targeted culture medium into the oil reservoir; opening the well to produce oil reservoir produced liquid; performing water-oil separation on the oil reservoir produced liquid to obtain produced water and produced oil; detecting the concentration of functional bacteria in the produced water in real time, and recording a detection result; and supplementing the functional bacteria and the targeted culture medium according to a detection result, so that the concentration of the functional bacteria reaches a preset concentration. The problem that in the prior art, the thickened oil recovery efficiency is low is solved.
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