Research on the Initiation Mechanism of Artificial Fracture in the Fractured Reservoir

摘要

The low permeability reservoir which has a significant proportion of oil and gas reserves is the focus on mining in the future. Hydraulic fracturing technology is a major means in achieving such reservoir exploitation. In this paper, the initiation mechanism of artificial fracture in the fractured reservoir is studied. Also, the crack condition is given. Then, the influence factors of initiation mechanism of artificial fracture are analyzed and the theoretical models are further verified through the field application. The results show that: for fixed size cracks, the integrating factor decreases with the increasing of the crack spacing; for fixed crack spacing, the integrating factor increases with the increasing of the crack size; for the same d/a, the larger the size of crack is, the more easily crack extends. By studying on the initiation mechanism of artificial fracture of fractured reservoir, provide theoretical basis for hydraulic fracturing technology being applied in low permeability fractured reservoir. So that the efficient development of special oil and gas reservoirs can be achieved.