Abstract:

The microbe association gas generating ability, system surface tension of surfactant generated by microbe, heat resistance and saly tolerance are analyzed, the association is reperated and selected from oil containing polluted water from Qinhai, Dagang, Shengli, Liaohe, Xinjiang and Nanchong refinery. It is recognized that temperature influences the microbe growing and the metablism of microbe group greatly, under the condition of extreme temperature of low temperature (＜5℃) and high temperature(＞75℃), the microbe group is less active, the gas generating microbe generates no gas. The change of temperature influence also the shape, size and distribution of single microbe, in high salinity, some microbe can grow. The influence of relative microbe content and internal composition is analyzed. Result shows under a certain condition, the microbe association is of stronger gasgenerating ability, it can decrease surface tension of the system, heatresistance and salttolerance. The sorted oil microbe can fairly adopt to reservoir condition and reduce oil viscosity. The microbe association is of superiority in oil recovery.

Key words: characteristics of oil microbes, heatresistance, salttolerance, surface tension, MEOR