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研究裂缝和油藏间的相互作用和影响,运用油藏数值模拟方法建立了模拟现场阶跃性实验的裂缝——油藏联合系统的有限差分模型。综合考虑岩石的力学性质对裂缝开启及扩展的影响,用数值方法求解出每个过程中井底压力随注入时间的变化关系。通过模拟得到的数据和现场实测数据拟合,可确定地层的最小水平主应力和岩石的临界应力强度因子,并用实例说明了这种方法的可行性。
To study the interaction and influence between fractures and reservoirs, a finite difference model of fracture-reservoir combined system simulating on-site step-by-step experiments was established by reservoir numerical simulation. Considering the influence of the mechanical properties of rock on the crack initiation and propagation, the relationship between the bottom hole pressure and the injection time in each process is solved numerically. By fitting the simulated data with the field measured data, the minimum horizontal principal stress and the critical stress intensity factor of the rock can be determined, and the feasibility of this method is illustrated by an example.