Abstract:

This paper aimed to summarize remaining oil distribution patterns controlled by muddy interlayers within braided bar of sandy braided river reservoir, using the method of waterflooding physical simulation. Our results show that remaining oil distribution is controlled by three factors, i.e.,  extensional length of interlayer, matching relationship between injection & production wells and interlayer, and perforation interval location. The longer the horizontal extension length of interlayer, the more enrichment space of remaining oil. If the perforation condition of injection and production wells is the same, when the production well was drilled into the interlayer, remaining oil will be more enriched. If the entire interval is perforated in the injection well, compared to the entire perforation interval of production well, enrichment space of remaining oil is bigger in the upper perforation interval of production well, and the degree of reserve recovery is smaller.

Key words:  remaining oil, physical simulation, braided river, interlayer