中国石油大学学报（自然科学版）Issue(3)：138-142,5.DOI:10.3969/j.issn.1673-5005.2015.03.019
初应力作用下孔隙介质升温时渗透率变化规律
Permeability variation law of porous media during heating process under effect of initial geostress
摘要
Abstract
To reveal the rule of permeability variation during thermal recovery of oil and gas reservoirs under different ground stresses, a thermo-hydro-mechanical coupled experimental system was developed, and non-adsorbed helium was used in the experiments. The change of helium gas viscosity with temperature and pressure was considered to eliminate the influences on the infiltration experiments. A series of infiltration experiments were conducted for coal and sandstone under different temper-ature conditions and different initial stresses. The results indicate that with the increase of temperature, the permeability of porous medium increases firstly, and then decreases in the form of nonlinearity and non-monotone. There is a temperature of inflection point related with the initial effective stress. The mechanism is described as the following:when temperature is low-er than the temperature of inflection point, temperature stress is less than the initial effective stress, pore space increases be-cause of the outward expansion of solid skeleton, so the permeability will increase. When temperature is higher than the tem-perature of inflection point, temperature stress is bigger than the initial effective stress, pore space decreases because of the inward expansion of solid skeleton. In addition, the temperature of permeability variation inflection point decreases with the increase of initial volume stress, the increasing rate of temperature stress is higher when the size of the initial volume stress is bigger.关键词
温度应力/孔隙介质/渗透率/初始地应力/热流固耦合Key words
temperature stress/porous media/permeability/initial geostress/thermo-fluid-solid coupling分类
建筑与水利引用本文复制引用
孙可明,辛利伟,张树翠..初应力作用下孔隙介质升温时渗透率变化规律[J].中国石油大学学报（自然科学版）,2015,(3):138-142,5.基金项目
国家自然科学基金项目(11072103) （11072103）
辽宁省高等院校优秀人才支持计划项目(LR2011008) （LR2011008）
