关键词:

内源微生物, 激活剂, 压力, 多孔介质, 硝酸盐

Abstract:

On the basis of summarizing the researches on indigenous microbial enhanced oil recovery at home and abroad, four activating nutrients were used to activate the indigenous microorganisms selectively.The total number of all bacteria, the numbers of beneficial bacteria and harmful bacteria and the surface tension of Zhan 3 injection water after activation were tested.Then, the physical simulation experiments of indigenous microbial flooding were performed.The results showed that these four activating nutrients could activate the beneficial bacteria successfully;meanwhile, the harmful bacteria SRB were restrained to some degree.Pressure and porous media could influence the growth of microorganisms, especially porous media.KNO₃ was better than NH₄NO₃ in the effect of activation and enhancement of oil recovery.With increasing content of nitrate from 0.1 % to 0.2 %, the change of activation effect was very little.Core flooding experiments indicated that the indigenous microorganisms could improve residual oil recovery by above 6 % after water flooding.

Key words:

内源微生物, 激活剂, 压力, 多孔介质, 硝酸盐