Field test on microbial flooding of ultra-low permeability reservoir in Ansai oilfield

An advanced microbial oil recovery technology is introduced to solve the problem of increased composite water cut year by year and the difficult of enhancing recovery ratio in ultra-low permeability reservoir of Ansai oilfield.Field research and tests are successfully carried out through strain selection,performance evaluation of broth and limits selection of reasonable injection parameters.The result confirms that microbial oil recovery has a well effect on decrea-sing water cut and increasing oil.This technology is a new direction in research on enhancing recovery ratio.