Optimization Research Of Different Enhanced Oil Recovery Methods On Typical Reservoirs In Yanchang Oilfield

Because of low permeability and reservoir heterogeneity in Yanchang oilfield,water absorbing capacity of the reservoir is poor,the water displacement is low and the water-flooding recovery is low.Recently,different enhance oil recovery(EOR)methods are widely use around the world and place a crucial role in oil production.For stabilize the oil production and improve the development efficiency,it urgent need to study the EOR methods that are suitable to Yanchang oilfield.In three typical reservoir Case,the numerical model were established base on the geological characteristic and fluid property,the remaining oil distribution were evaluated through the history matching method.According to the suitability evaluation criteria of different EOR methods,applicable EOR methods were screened.Orthogonal design and numerical reservoir simulation method were used to predict production performance and the most suitable EOR methods were determined by consider recovery,oil producing rate and average pressure.The net present value(NPV)of different exploitation programs was calculated.Consider both technical and economic indicators,the optimal EOR methods were determined.Optimization result show that whenever using EOR methods could increase oil production and improve reservoir exploitation,but the optimal EOR method for each reservoir is not consistent;when crude prize is higher than 40 dollar per bbl,using EOR method would be economical,and higher crude prize means higher NPV,but optimal EOR program may be inconsistent under different crude prize.