Abstract
To enhance oil recovery by injection of seawater into the production well causes an increase of hydrogen sulfide concentration in the crude oil by the environmental microbes. It is known as biological souring caused by sulfate-reducing bacteria (SRB) in the reservoir. The souring causes microbiologically influenced corrosion (MIC) of the tubing material and deterioration of crude oil. In this chapter, the change of microbial consortia during the souring process of the crude oil is described. Especially, by clarifying the population of SRB in the microbial consortia, the effects of nitrate injection not only on the biological souring but also to MIC are explained. Moreover, the possibilities of alkaline addition to suppress the biological souring and MIC of carbon steel are also argued.
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