Sidney J. Nelson, Phillip D. Launt RAM Biochemicals Inc. Raleigh, N.C. Stimulation of single wells by microbial injection has proved to be an effective technique for improving marginal oil production. Microbial stimulation is particularly suited for stripper wells because of the relatively low cost for process development and testing, and even lower cost for subsequent well treatments. The U.S. is estimated to have had approximately 500 billion bbl of oil in place before production was first begun. Primary recovery driven by existing reservoir gas pressure and natural water movement will retrieve 12-15% (approximately 75 bil...

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