MEOR APPLICATIONS—1:Microbes enhance oil recovery through various mechanisms

Microbial enhanced oil recovery (MEOR) methods rely on microorganisms and their metabolic products to mobilize residual oil in several different ways.MEOR mechanisms include interfacial tension reduction, selective plugging, gas production, biodegradation, and wettability alteration.The process is environmentally friendly and easy to operate.This first of a two-part series summarizes the mechanisms, while the concluding part will discuss 10 field cases involving 221 producing wells in Malaysia, US, Argentina, and China.Enhanced oil productionOil and gas exist in porous rocks at depths from several hundred to several thousand meters. In the early life of an oil field, the reservoir pressur...

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