单裂缝致密砂岩流固耦合实验与机理  

Fluid-solid coupling experiment and mechanism of single fractured tight sandstone

作　　者：唐汉林[1] 孟英峰[1] 任文希[1] 谷雨桐[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《油气藏评价与开发》2016年第3期50-54,共5页Petroleum Reservoir Evaluation and Development

摘　　要：研究裂缝岩体的流固耦合行为具有重要的工程意义。为了解单裂缝岩心渗透率在流固耦合作用下的演化规律,开展了不同围压和不同孔隙压力下的加载、卸载实验。实验结果表明:加载过程中,随着有效应力的降低,渗流流量与压差的关系曲线会出现"末端偏离"现象,随着有效应力的升高,"末端偏离"现象消失。卸载过程中,"末端偏离"现象不明显;岩心尺寸越大,裂缝开度越大,流固耦合效应越强;较定围压、变流压的实验方法而言,定流压、变围压的实验方法会低估裂缝岩心的流固耦合效应。It is important to study fluid-solid coupling method of fractured sandstone. In order to study the core permeability of sin- gle fractured sandstone by coupling interaction effect, seepage tests under different loading and unloading confining pressure and different pore pressure are conducted. The results show that, firstly, in pressure loading process, with the decrease of effective stress, the relation curve of seepage flux rate and pressure drawdown may appear terminal deviation, and with the increase of effec- tive stress, this phenomenon may disappear, however, in pressure unloading process, terminal deviation phenomenon is not obvious, secondly, with the increase of core size, fracture aperture is increased and fluid-solid coupling effects are enhanced, thirdly, in terms of stable confining pressure and changed flow pressure, the experiment method of stable flow pressure and changed confining pressure may underestimate fluid-solid coupling effects of fractured core.

关 键 词：致密砂岩 有效应力 裂缝 流固耦合 渗透率 

分 类 号：P618[天文地球—矿床学]