Abstract: Hongshanzui oilfield has more than 20-year history of water-injection development. Although the recovery percent of reserves is relatively low at present, the overall water-cut of this oilfield is high, and the injection-production conflict is very serious. To obtain better development effect, studies on technologies such as water drive at late stage, polymer flooding and deep profile control and oil displacement have been carried out using numerical simulation technology for Lower Karamay reservoir in faulted block Hong-48, which is the key reservoir of the oilfield. The results show that under the current conditions the ultimate recovery by water drive can reach the calibrated recovery; the stable oil production by water-cut control and the improved ultimate recovery can be realized through polymer flooding, but the operational cost for this technology is relatively high and the water quality should be improved. The recovery by deep profile control and oil displacement is less than that by polymer flooding, but this technology can be used to better solve the problems that happened during polymer flooding process. It is concluded that deep profile control and oil displacement technology is the best production method for improving the development effect under the current conditions.

Key words: Hongshanzui oilfield, production method, deep profile control and oil displacement