各向异性弹性孔隙介质中的热-流-变形耦合模型

Coupled models of heat-flow-deformation for porous medium with anisotropical elasticity

研究微小孔隙介质中应变导致渗透率各向异性的问题.采用有限单元法综合分析处理储层变形-渗流-热传导耦合模型与应变导致渗透率变化模型,并用该方法分析弹性多孔介质的二维非等温变化单相渗流的耦合问题.对比结果表明,应变导致的渗透率变化模型能有效反映蒸汽注入引起的岩层各向膨胀,与热采过程中油藏的实际情况更吻合.

A problem of strain-induced anisotropy of permeability in media with minute porosity was investigated.A coupled model of deformation-flow-heat transfer of storing stratum and a model of strain-induced permeability variation were comprehensively analyzed and processed with finite element method and it was also used to analyze two-dimensional non-isothermal single-phase percolation in elastic porous media.Comparative result showed that the strain-induced permeability model could effectively reflect multidirectional expansion of strata induced by steam injection, and it was much more consistent with the actual situation of oil reservoir.