A novel model of initial fracture pressure in fractured formation
by Yi Ding; Pingya Luo; Xiangjun Liu
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 24, No. 1, 2020

Abstract: Initial fracture pressure is basic parameter in design of hydraulic working. In fractured formation, abundant natural fractures increase complication of predicting initial fracture pressure. Without accurate initial fracture pressure, reservoir stimulation efficiency will be impaired. Therefore, in this paper, in combination with shear and tensile strength criterion in multiple natural fracture planes condition, a new fracture initiation model has been established. Based on this model, influence factors of fracture initiation have been analysed. Results indicate that initiation type could be tensile or shear failure along fracture plane, decreasing the initial fracture pressure. Initial fracture pressure is related to fracture occurrence and its decline becomes large due to increasing fracture number. With multiple natural fractures, initiation is totally controlled by natural fracture. In the application, results of this model are good consistent with oilfield data. Thus, this model can offer guidance for hydraulic fracturing. [Received: May 22, 2017; Accepted: June 19, 2018]

Online publication date: Mon, 20-Apr-2020

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