采油复合菌的驱油机理

为改善宋芳屯油田的生产状况,从芳6区筛选到了3株以烃类为唯一碳源、兼性厌氧的驱油微生物菌种,并对其与原油的作用、代谢产物对原油物性的影响以及提高采收率的能力进行了研究。研究表明:这3株菌均具有产表面活性剂、产酸、产气活性,最适生长温度相近;它们均可以烃类为碳源、在油层温度下正常繁殖、兼性厌氧生活。组成的复合菌对原油中饱和烃、非烃等基本上都有降解作用。岩心试验表明,复合菌能显著提高采收率,并能在多孔介质中改善原油物性,使原油黏度、油水界面张力、pH值及蜡含量明显降低。该菌种能明显改善原油物性,具有很强的驱油活性。

Oil displacement mechanism of compound bacteria

To improve the production of Songfangtun Oilfield, the author selects three facultative anaerobic microbial strains with hydrocarbon as carbon source from Block Fang-6 of the oilfield and conducts research on the interactions between the microbial strains and crude oil, the impact microbial metabolite on crude oil properties, and the capability of the microbe in enhancing oil recovery. Research shows that the three microbial strains have approximate optimum growth temperature strains and all of them are capable of releasing biosurfactant, acid, and gas. What's more, they can take hydrocarbon as carbon source, grow up under reservoir temperature, and make anaerobiosis. The compound bacteria composed of the three strains can degrade the saturated hydrocarbon and nonhydrocarbon in crude oil. Core test shows that the compound bacteria can greatly enhance oil recovery, improve the physical property of crude oil in porous media, and therefore decrease the viscosity, oil/water interfacial tension, pH and wax content of crude oil obviously. Test results indicate that this type of microbe can improve physical property of crude oil and has great capacity of oil displacement.