Study on optimizing development manners after steam huff and puff in District No.9,Karamay oilfield

The heavy oil pool in District No.9 of Karamay oilfield is characterized by self-contained type,simple structure, long development history,steam huff and puff drive and steam drive.Numerical simulation method is adopted to sim- ulate the fine development history.On the basis of analyzing the reserve mobilization,and the distribution and effective factors of residual oil,forecasting models are revised to per- form the optimization and forecasting of the multiply well group,multiform development modes and multiply injection and recovery parameters;hence define the rational intermit- tent steam drive cycle,steam injection velocity and adjust- ment time.Results suggest that after steam huff and puff, the development index of the development mode integrating intermittent steam drive,speed-variable steam drive and hot water flooding is superior to others.On-site practice shows that the development mode presented is feasible and can be used for reference for other same kind of oilfields.