Investigating the simultaneous fracture propagation from multiple perforation clusters in horizontal wells using 3D block discrete element method

Multi-cluster horizontal well fracturing is one of the key technologies to develop unconventional reservoirs such as shales. However, field data shows that some perforation clusters have little production contribution. In this study, a three-dimensional (3D) numerical model for simulating multiple fracture propagation based on 3D block discrete element method was established, and considers stress interference, friction fluid-mechanical coupling effect. order determine most appropriate measures improve uniformity propagation, effect geologic engineering parameters in shale investigated. The modeling results show geometry each within stage different, outer fractures generally receive more fluid than interior fractures. vertical almost has no geometries higher difference, larger cluster spacing, smaller number, injection rate, viscosity are conducive promote uniform existence bedding planes will increase filtration, resulting reduction length. middle two less width them smaller. Through analyzing results, large amount should be injected proppant with size suggested used effectively prop planes. Cluster spacing number controlled an range according reservoir properties. Increasing rate reducing important means fracture.