低渗透砂岩油藏压力敏感性研究

Research on stress sensitivity in low permeability sandstone reservoirs

针对低渗透油藏渗透率压力敏感性较强的特点,选用不同渗透率的岩心进行了压力敏感性实验;不同有效压力加载方式渗透率敏感性实验;岩石力学体积应变实验。结果表明,低渗透岩心渗透率敏感性强于中、高渗透岩心;渗透率损失主要发生在有效压力增大的初始阶段;岩石弹塑性形变阶段的体积应变主要发生在围压较低阶段。

Stress sensitivity experiments with different permeabilities and stress loading modes and volμmetric strain experiments were aiming to investigate permeability sensitivity to effective pressure in low permeability reservoirs.The results show that the permeability sensitivity in low permeability reservoirs is more serious than that in higher permeability reservoirs.Permeability reduction mainly occurs in the initial increase in effective pressure.Volμmetric strain in the stage of elastic plastic deformation ...