低渗透油藏应力敏感性实验研究

Experimental study on stress sensitivity for low permeability reservoir

李明军 杜建芬 卞小强

西南石油大学石油工程学院，四川 成都 610500

Southwest PetroleumUniversity, Chengdu 610500, China

应力敏感性是指油气层的渗透率随有效应力的变化而发生改变的现象。实验是在岩心常规孔隙度、渗透率测试的基础上，对CQ油田某一区块的4块柱塞岩心分别进行了岩心应力敏感性、孔隙体积及压缩系数的测试。结果表明，随着有效应力的增高，低渗透岩心的渗透率明显降低。

Reservoir permeability is a function of effective stress. Stress Sensitivity refers to the phenomenon of which the reservoir
permeability is a function of effective stress. Based on the conventional core porosity and permeability tests, this paper
discusses the core stress sensitivity, pore volume, compaction factor tests on four plunger piston cores from CQ Oilfield. The
experimental results show that the permeability of the low permeability cores has been obviously decreased in the wake of the
increase of effective stress.