ABSTRACT

The reservoir of Erlian oilfield belongs to the small fan—delta deposit system of cliffs, coarse grains and near source. It is in the high-watercut and ultra-high watercut stage in Erlian oilfield: the average recovery rate was only 17.3% and the near wellbore processing cannot resolve the extreme heterogeneity problem in deep reservoir. Field test confirms that the profile controlling and oil displacement technique are effective methods to improve recovery factor in the middle-late period of the reservoir development. The types of the reservoir are low permeability sandstone reservoir, medium permeability and conventional heavy oil sandstone reservoir, conglomerate reservoir and so on. According to the continuity requirements of the profile controlling, oil displacement and microbial injection work, and different requirements of injection parameters in different blocks, different well location and different measures, the system takes the process of alternate dispensing and continuous injection.