安塞油田长10储层渗流特征研究

为了全面研究陕北低渗透油田—安塞油田长10油藏渗流机理,解决开发过程中渗流阻力大、注水效果差等问题,进一步改善油田开发效果,应用室内高精度微量泵和高精度压差传感器对长10储层岩心开展了油水渗流特征、水驱油效率、启动压力梯度等多项实验研究,并推导了低渗透油田IPR新方程,结果表明该储层原油的物性非均质性较强,流体渗流不遵循达西定律,存在启动压力梯度且启动压力梯度与储层的渗透率成反比;油水两相渗流特征反映束缚水饱和度较高,油水两相流动范围窄,具有典型的低渗亲水油藏特征,因此可通过降低启动压力梯度、增大生产压差来改善开发效果。

Research on the Characteristics of Chang 10 Reservoir of Ansai Oilfield

In order to study the percolation mechanism of Ansai oilfield ChanglO reservoir, solve the problem about high seepage resistance and poor effect of water injection in the development process, improve the development effect of oilfield, the author launched some experiments, for example, oil/water percolation characteristics , the effi- ciency of water driving oil and the start - up pressure gradient with and high - precision micro pumps and high pre- cision differential pressure sensor for ChanglO reservoir and deduce the new IPR equation about low permeability oilfield. The results show that the fluid in ChanglO reservoir is strong heterogeneity , and it does not follow darcy＇s law, the reservoir has start - up pressure gradient which inversely proportional to the permeability ; the reservoir has a characteristics of hydrophilic, because high irreducible water saturation and narrow range of oil/water two - phase, it can be improved the development effect by reducing the start - up pressure gradient and expanding the differential pressure of production.