储层应力敏感性影响因素研究

Influential factor analysis of reservoir stress sensitivity

全面分析储层应力敏感性产生的机理认为,外部因素的改变会引起储层产生应力敏感性,而储层岩石物性等内部因素对应力敏感性的强弱起决定性作用。室内岩心应力敏感性评价时,仪器与设备的精度、加载与卸载方式、实验用流体类型以及各种人为因素等都会对评价结果产生影响,其中岩心密封套在高压、高温条件下的密闭性会对实验结果产生较大影响。所以储层应力敏感性不应该从孔隙度和渗透率的高低进行简单评价,中、高渗储层和低渗储层在生产过程也都可能表现出较强的应力敏感性现象。

The authors analyze all-sided the mechanism of reservoir stress sensitivity and put forward that the change of external factor would arise stress sensitivity,the physical property of reservoir rock is the decisive factor for the stress sensitivity.When we do indoor experiment of stress sensitivity,the precision of apparatus and equipment,the method of load and unload,the type of lab fluid and man-made factors all will influence the experiment result.The sealing performance of rock core seal-gasket at high pressure and temperature will affect the experiment result seriously.We can't simply evaluate reservoir stress sensitivity from reservoir porosity and permeability.Stress sensitivity not only exists in low permeability reservoir,but also exists in medium and high permeability reservoir.