Feasibility analysis of converting steam flood in the later stage of huff and puff in Du 239 block heavy oil reservoir

Du239 block in Shuguang oilfield has developed for more than twenty years, oil well average huff and puff reached12 cycles, which is in the " two high and two low" stage of development. The current development methods is hard to further improve the development effect. Combined with the geological characteristics, it is put forward suitable steam flooding development plan for reservoir own characteristics from the development characteristics and remaining oil distribution, which can effectively improve the ultimate recovery rate.