马寨油田分层开采提高采收率研究

马寨油田为低渗透强亲水油藏，层间渗透率差异大，原油粘度低，井网密度大。由于多年的合采使油田综合含水高达92．9％，工业采出程度仅为76．6％。结合马寨油田的开采特点，论述了分层开采提高采收率的潜力，通过岩心实验证明了马寨油田分层开采可以提高采收率，现场应用结果证实了该结论。为该油田的层间产能接替提供了一个有效的开发方式，对同类油田也具有普遍的指导意义。

Research on Improving Oil Recovery by Zonal Production in Mazhai Oilfield

Mazhai oilfield is a strongly water wet reservoir with low permeability, low oil viscosity, highly variable inter formational permeability and large well spacing. Up to now, the recovery is only 76.6% of the reserves while the comprehensive water cut has reached 92.9% as a result of commingled production in the past years. In this paper, the reasons of low recovery in Mazhai are discussed, and the potential of improving oil recovery by zonal production is shown. Experiments on core samples indicate that improved oil recovery could be realized by separate zone production, and the experimental results have been proven in the oilfield practice. Zonal production provides an effective development mode for keeping a high oil production in the oilfield.