天然裂缝性油藏渗吸规律

为了研究渗吸作用对天然裂缝性油藏的影响,改善该类油藏的开发效果,以数值模拟为手段,通过建立概念地质模型,以静态和动态2种方式研究了毛细管压力、孔隙均匀程度、相渗曲线、基质和裂缝渗透率、原油黏度和基质含油饱和度对基质渗吸速度的影响,并在静态下对相关参数进行了公式拟合.静态下,渗吸速度与毛细管压力、基质渗透率、残余油饱和度、束缚水饱和度下的油相相对渗透率呈直线关系,与束缚水饱和度呈指数关系,与原油黏度呈幂指数关系;动态下,对于不同润湿性的油藏提出了不同的开发方式.

Imbibition law of naturally fractured reservoirs

To study the effect of imbibition on the naturally fractured reservoirs and improve the development performances, a typical geological model for the naturally fractured reservoirs was established. The influence of capillary pressure, uniformity of the pore, relative permeability curve, matrix permeability, fracture permeability, oil viscosity and matrix oil saturation on imbibition, which is divided into static and dynamic state, was studied by means of numerical simulation and the formula was fitted between imbibition rate and influence factors. For static state, a linear relationship is obtained between imbibition rate and capillary pressure, matrix permeability, residual oil saturation to water and relative permeability of oil at the irreducible water saturation, an exponent relationship is obtained between imbibition rate and irreducible water saturation, and a power exponent relationship is obtained between imbibition rate and oil viscosity. For dynamic state, the different development mode is proposed for the reservoirs with different wettability.