Abstract: Taking a typical glutenite reservoir—Shuanghe oilfield as an example, the authors of this paper made an investigation into the regularities of changes in poroperm parameters, pore structures and fluid flow characteristics of glutenite oil reservoirs during ultra-high water cut period. Sealed cores from oil wells were examined, and waterflood experiments with long cores from the oilfield were performed. Results show that reservoir poroperm parameters, pore structures and fluid flow characteristics change drastically with increased levels of waterflooding. It is pointed out that development strategy should be adjusted accordingly in late development phase of such reservoirs.

Key words: glutenite reservoir, ultra-high water cut, poroperm parameter, change, waterflood experiments