Method for in-situ removal of reservoir plugging using microorganisms and in-situ reservoir oil displacement, and iron-reducing bacterium activator

Abstract

The present application belongs to the technical field of petroleum extraction, and specifically relates to a method for in-situ removal of reservoir plugging using microorganisms and in-situ reservoir oil displacement, and an iron-reducing bacterium activator. The method includes the following steps: injecting a microbial mixture into a target reservoir to allow in-situ activation of microorganisms, such that magnetic iron nanoparticles are generated in-situ in the target reservoir to obtain a plugging-removed target reservoir; wherein the microbial mixture includes an iron-reducing bacterium fermentation broth and an iron-reducing bacterium activator; and injecting water into the plugging-removed target reservoir to allow the reservoir oil displacement. In summary, the method removes reservoir plugging caused by secondary precipitation of Fe(OH)3 through an environmental-friendly biological method. Meanwhile, the microorganisms with an iron-reducing activity enable a green and low-cost biological method to produce highly-active magnetic nanoparticles in situ to allow the reservoir oil displacement.

Dependencies are inferred from the claim text.