Abstract: Hu12 Block of Hu Zhuangji oil field is a highly heteroge-neous reservoir. At present the water cut in this block is quite high while the recovery rate is still low after waterflooding more than a decade, which means that there is much oil remaining in place. In order to get more oil from this block, we employed a
couple of ways such as Lab experiments, correlations from home and abroad and field data to predict the final recovery rate. Ac-cording to our research results, we can enhance the potential oil production by improving the sweeping efficiency of waterflood-ing. We also suggest that many conventional ways such as grouping smaller layers, changing the well pattern in some area, controlling profile and applying EOR should be used to improve recovery rate.

Key words: recovery rate, predict, heterogeneity, sweep efficiency