应力敏感储层相对渗透率计算方法研究

A CALCULATION METHOD FOR RELATIVE PERME ABILITY CURVE OF STRESSSENSITIVE

对于存在应力敏感的储层,地层压力的变化造成孔隙度及渗透率的降低,影响流体渗流规律及特征,导致相对渗透率曲线形态发生变化。孔隙网络技术是计算相对渗透率的有效手段。在该技术的基础上,考虑储层应力敏感,建立孔隙微观结构特征参数动态模型,计算地层压力变化下的相对渗透率,研究相对渗透率曲线的动态变化规律,并拟合实验数据,拟合精度在误差范围之内,拟合结果良好。结果表明:该方法能用于计算应力敏感储层相对渗透率,为油气藏工程及数值模拟研究提供必要参数。

For the stress sensitive reservoir,the change of reservoir pressure can result in the decline of porosity and permeability and affect the flow feature and rule,so the relative permeability curves' shape will change.The prerequisite of reservoir engineering research is to obtain the relative permeability curves under different reservoir pressure.The pore network technology is one of the effective methods to predict and calculate relative permeability.Based on the technology and considering the stress sensitivity,the dynamic models of pore's microscopic structure characteristic parameters are established,the variation of relative permeability curves under the change of reservoir pressure is calculated and the experiment data is fitted.It is verified that the method can be used for the calculation of relative permeability for the stress sensitive reservoir,and the necessary parameter can be given for the study of reservoir engineering.