在变形介质气藏开采过程中,由于流体的产出,使储层岩石受力发生改变并使储层岩石发生弹塑性变形;而弹塑性变形反过来又影响到储层的渗透率。一般来说,影响变形介质气藏储层岩石渗透率变化的主要因素有内部因素和外部因素两种。内部因素主要包括岩石的弹性模量、泊松比和含水饱和度;外部因素包括上覆岩层压力、水平应力和孔隙流体压力。根据对变形介质气藏储层岩石受各种因素影响的分析,说明了各种因素对渗透率的影响是非常大的,并最终影响到气井的产能。为了给变形介质气藏的合理开采提供理论依据,认为开采前后应充分考虑这些因素对渗透率的影响和对这些因素进行研究。

In the developing of deformed media gas reservoir, the stress of reservoir rock will be changed by outflow of the gas, and the rock will have elastoplastic deformation, on the contrary, the deformation influence permeability of reservoir. Commonly, the influence factors include interior factors and exterior factors: the interior factors include elasticity module, Poisson ratio and moisture saturation, and the exterior factors include the cover terrane pressure, level stress and fluid pressure. The influences for permeability of reservoir is effectively by analyze the factors. In order to develope these reservoirs, these factors must be considered. And the study for the factors will offer a theory for reasonably developing of deformed media gas reservoirs.