Calculation Model Study on Damaging Stress of Hydraulically Created Fracture Propagation

In order to describe hydraulically created fracture propagation's characteristics of rock matrix exactly, in this paper, establishing a stress field's calculation model of fracturing propagation tip, obtaining numerical method of fracturing propagation's characteristics based on damaging and describing fracturing propagation's characteristics combined with method of finite element. Research shows that the corrigendum between stress field 's calculation model of fracturing propagation tip and practical engineering are 0.64 percent and 1.43 percent respectively. Compared with the traditional method, the result is more exactly.