关于砂岩气藏储层应力敏感性研究与探讨

为了研究砂岩气藏开发过程中岩石应力敏感性特征及其对生产指标的影响，结合常规钻井取心过程中岩石应力变化过程以及气藏衰竭开采过程孔隙压力下降特征，建立了砂岩气藏储层岩石受力物理模型，分析了气藏开发过程中储层岩石应力“时、空”变化特征，测试了苏里格、须家河等气田储层岩石渗透率应力敏感性；再结合典型低渗致密砂岩气藏储层物性及地质特征，选取不同渗透率岩心进行组合，建立了气藏开发物理模拟实验流程和方法，开展了气藏衰竭开采模拟实验，研究了储层岩石应力敏感性对气井稳产能力、产量递减特征、储量动用速度及采出程度等气藏开发指标的影响，取得了一些新认识，对砂岩气藏科学开发具有一定指导意义.

Study on the Stress Sensitivity of Sand Gas Reservoir

There is no clear answer for how the development of gas reservoir has been influenced by the stress sensitivity of rock.The rock stress mathematical model and physical simulation experiment have been established to study the characteristics of stress changing during well drilling and the influence of the stress sensitivity on gas reservoir development.On the basis of the rock stress mathematical model,the changing rule of rock stress along with “time and space” has been analyzed.Many cores from different gas fields such as Sulige and Xujiahe have been tested under different stress conditions.In the physical simulation experiments,the influence of stress sensitivity on some development index such as the stabilized production of well,the gas producing velocity of reservoir and the gas reservoir recovery have been researched.Some new understandings have been drawn which are significant for scientific development of gas reservoir.