Abstract
Abstract A new technology based on the existence and microbial utilization of the preformed volatile fatty acid content of the reservoir waters, prevents sulfate reduction by sulfate reducing bacteria by the competitive removal of the volatile fatty acids in the reservoir waters. A new microbial population is developed in the presence of nitrate which has the capabilities of producing in-situ products such as gases and polymers — all known recovery agents. Laboratory investigations demonstrate the versatility and potential of the system to alter microbial populations by subtle changes in the reservoir waters. Core flooding data show increased oil production. This novel approach to prevent and reduce sulfide while at the same time to increase oil recovery is termed "Biocompetitive Exclusion". A microbial liability in the field is turned to an advantage and offers the petroleum industry a low cost methodology for reservoir control and stimulation.
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