부산대학교 도서관

This is a method of producing oil from an oil-bearing formation containing mineral sulfates to reduce bacteria and pronounced corrosion to metal equipment. The formation is fractured with a fracturing fluid consisting of a carrier liquid. About 100-100,000 ppM of a soluble bactericide effective against sulfate-producing bacteria is added to the fracturing fluid. The fracturing fluid is then pumped into the well bore and forced into the formation with sufficient pressure to fracture the formation and create flow channels. Substantially all of the fluid containing the bactericide is removed and reservoir oil is produced to the surface. The bactericide may be water-soluble, organic-substituted, quaternary ammonium compound characterized by its ability to reduce the surface tension of water.