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“Improved Oil Recovery & EOR using Biological Enzymes”

OILFIELD LOW PERMEABLE RESERVOIR FLOODING TECHNIQUE OF ENZYME

High Dongmei , Zhejiang UniversityAbstract: Oilfield is a typical low permeability oil fields, after two years of flooding, some blocks of the original well network adaptability is poor, oil wells, is difficult to establish effective inter-drive system, low oil pressure recovery, the current formation pressure is lower than the original pressure, and even lower than the saturation pressure, resulting in waterflooding oil recovery is low, and measures to tap the potential lack of stimulation, there is a restricted field of sustainable development. To compensate for these limitations and lack of technical measures to further enhance the low permeability oil exploration for the ultimate recovery of the non waterflooding technology, to establish an effective drive system to achieve cost-effective to use, the introduction of enzyme recovery technology to conduct biological enzyme block, oil field test. In this paper, oilfield reservoir characteristics of the geological features and the low permeability reservoir proposed for the development of enzyme production technique, mainly discusses the characteristics of enzymes, performance, biochemical mechanism, displacement mechanism, and biological experiments and enzyme enzyme displacement field test results. Laboratory experiments showed that the enzyme has a unique flooding mechanism, which can eliminate the boundary layer of rock; change the reservoir wettability state, reduce the wetting angle, the reservoir rock change from hydrophilic lipophilic; lower reservoir interfacial tension of the rock particles; thereby reducing the reservoir of crude oil in the pores of the flow resistance, so that the release of oil from the surface of rock particles, through the role of dialysis, to broken down, the effects of flooding. Enzyme site in the oil displacement test throughput and achieve the expected goal, and achieved a significant increase in oil effect, so that enzyme technology as the oilfield oil reservoir to improve the development effectiveness of low permeability and effective technical means