The Optimal Design of Hydraulic Fracture Parameters in Fractured Gas Reservoirs with Low Porosity

Abstract

Abstract-A new composite reservoir simulation model was developed to optimize the hydraulic fracture length and conductivity for guiding fracturing designs. The model is made of inner part and outer part. The inner part is dual-porosity and dual-permeability system, and the other is single porosity system. Based on the model, the effect of reservoir parameters, hydraulic fractures parameters, and non-Darcy flow effects on gas production were studied. The research shows that the natural fracture permeability and density are the most influential parameters; a relative long fracture with high hydraulic fracture conductivity is required for a high production rate due to non-Darcy flow effects. A shorter primary fracture is better in a gas reservoir of high natural density. The composite model represents the flow characteristic more accurately and provides the optimal design of fracturing treatments to obtain an economic gas production.