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In-situ  microbial enhanced oil recovery (MEOR) is of high industrial importance during a period of low oil prices. However,  in-situ  MEOR is still not widely expanded due to the lack of sufficient data. This paper summarizes and analyzes the progress of  in-situ  MEOR in the Shengli oilfield. There are a variety of endogenous microorganisms in Shengli oil reservoirs. We assess the reservoir characteristics, activators, microbial community structure, and the correlation between predominant microorganisms and oil recovery increment in field trials of  in-situ  MEOR. The mechanisms of  in-situ  MEOR are acknowledged through field trials tests, long core flood experiments, and a visual microscopic seepage model.  In-situ  MEOR is shown to be an effective method for enhanced oil recovery. Future studies are needed to optimize the activator formula and control the combined effect of aerobic and anaerobic microorganisms.

Developments in in-situ microbial enhanced oil recovery in Shengli oilfield