Exploring the propagation of hydraulic fracture with nonuniform stress based on the block distinct element method

The stress field is a critical factor for fracture propagation in hydraulic fracturing. Attention should be paid to with the nonuniform field. A gradient was established investigate influence of nononuniform on propagation. Based three-dimensional block distinct element model law obtained. mechanism and magnitude uneven revealed. Aiming at propagation, elastic modulus construction parameters analyzed. results show that follows χ2 distribution equation can expressed by product injection rate fluid viscosity. This conclusion theoretical significance fracturing situ stress.