裂缝性低渗透油藏流固耦合渗流分析

Analysis on the Fluid-solid Coupled Flow in Low Permeability Fractured Reservoir

在低渗透油田的开发过程中 ,油藏流体渗流和储层岩土之间存在明显的耦合作用。本文首先研究给出了低渗裂缝性储层孔渗参数的等效方法 ,然后将渗流力学和岩土力学相结合 ,给出了低渗透裂缝性储层流固耦合渗流的数学模型 ,该模型不仅可以反映基质孔渗参数在开发中的变化 ,而且更能反映裂缝开度变化所引起的渗透率变化 ,而这对于低渗透裂缝性油田而言十分重要。最后对一实际井网进行了流固耦合油藏数值模拟 。

During the development of low permeability reservoir, interaction between fluid flow and rock deformation is obvious. The paper develops an equivalent continuum model adapted to low permeability fracture reservoir, combining fluid mechanics in porous medium and elastic-plastic theory. A fluid-solid coupling mathematical model is given. The model not only reflects the porosity change of matrix, but also the permeability change due to fracture's open and close. Via the simulation results, porosity and permeability changes and its effect on oil development are studied.