Abstract: After nearly 40 years of development,Shengli Oilfield has entered the high-cycle post-huff-n-puff stage,and the unbalanced utilization leads to the poor throughput development effect. The combined huff-n-puff method effectively improves the high-cycle development effect and increases the recovery rate at the huff-n-puff stage. However,Shengli Oilfield is rich in heavy oil types,and the development stages of oil wells are very different,so a single combined huff-n-puff mode is difficult to adapt to all reservoirs. By establishing different combinations of huff-n-puff modes,the paper provides experience for improving the development mode of heavy oil reservoirs in Shengli Oilfield.

Key words: heavy oil, steam huff-n-puff, combined huff-n-puff