MULTISTAGE PROCESS FOR RECOVERING PETROLEUM USING MICROORGANISMS

摘要

Process for recovering petroleum from petroleum reservoirs by injection of aqueous flooding media into a petroleum formation through injection wells and extraction of petroleum through production wells, where the process comprises a plurality of cycles of process steps in which oil-mobilizing microorganisms and flooding water are alternately injected into the reservoir. Processes in which highly permeable regions of the petroleum formation are additionally blocked.