Fracturing Effect Evaluation for Ultra-Deep Fractured Reservoirs in Kuqa Piedmont

The ultra-deep fractured reservoir in Kuqa Piedmont has the characteristics of high temperature, high pressure, and strong heterogeneity. The hydraulic fracturing effect has many influencing factors and is difficult to evaluate. Combined with finite element simulation technology and damage mechanics theory, a fracture propagation simulation model coupling "fluid-solid-temperature" three-field is constructed, and an evaluation method for the fracturing effect is established. The influence of parameters such as fracturing fluid injecting pressure, formation pressure, ground stress, and natural fracture density on the fracturing effect is analyzed. The results show that: The higher the fracturing fluid injecting pressure and formation pressure, the better the fracturing effect; the greater the differential stress between the maximum horizontal principal stress and the minimum horizontal principal stress, the greater the fracture half-length in the direction of the maximum principal stress. When the differential stress is 30 MPa, the fracturing range is the largest. The greater the density of natural fractures, the better the fracturing effect. The research results have been verified in two production wells in the block. Based on the research results, the fracturing position can be optimized. The research results can provide strong support for the high-quality production of ultra-deep fractured reservoirs in Kuqa Piedmont.