Complex Fracture Closure Pressure Analysis During Shut-in: A Numerical Study

Conventional fracture closure models typically assume homogeneous formation. This assumption renders complex pressure analysis during shut-in insufficient at present. In this paper, we use a cohesive zone method (CZM)-based finite element model to obtain the and minimum horizontal principal stress of major branch based on fall-off analysis. Key factors including leak-off rate, injection time, anisotropy are discussed in detail. A quantitative relationship between these is plotted reduce or eliminate errors caused by conventional diagnostic models. The results show that have significant effect process. Fracture naturally fractured formations slow process, early represents fracture, which much higher than stress. investigation provides new insight into how estimate in-situ reservoirs.