低渗砂岩渗透率应力敏感性实验研究

储层岩石物性受有效应力变化而变化的现象称为储层岩石的应力敏感性，在油气钻井及开采过程中，这种变化将导致岩石孔隙和裂缝产生不可逆转的闭合，并将直接造成产能的损失。通过在室温下改变实验岩心围压的方法进行常规的应力敏感性实验并对实验数据进行分析，同时把实验岩心的应力敏感性与通过铸体薄片和压汞实验得到的微观结构结合起来，分析了致密低渗油藏渗透率敏感性的特点、微观结构与应力敏感性之间的联系，同时建立了渗透率随有效应力变化的关系式，为储层岩石应力敏感性的研究和应用提供了实验依据。

EXPERIMENTAL RESEARCH ON PERMEABILITY SENSITIVITY OF LOW-PERMEAB ILITY SAND ROCK

The phenomenon of the change of physical parameters in reservoir rock owing to the change in effective stress is called the stress sensitivity of reservoir rock.During drilling and exploitation,this change will result in irreversible close in rock's pores and fractures,and reduce productivity directly.The conventional experiment of stress sensitivity is conducted at room temperatures by altering the confining pressure of laboratory cores.Combining the experimental data with the microstructure of rocks obtained by cast thin section and Mercury-Injection method,this paper investigates the permeability sensitivity characteristics of low-permeability reservoirs and the relationship between microstructure and stress sensitivity.The functional relationship between permeability and effective stress is established providing experimental basis for the research and applications of the reservoir rock stress sensitivity.