Finite Element Modeling of Hydraulic Fracturing in Vertical Wells

Abstract

Hydraulic fracturing is one of the techniques employed in reservoir stimulation to maximize production and extend the reservoir’s lifetime. In this sense, the prediction of the fracture’s geometry and propagation in the formation is crucial to estimate production gains and thus to determine the treatment feasibility. This paper investigates vertical hydraulic fracture propagation through rock formation with finite element models. The vertical fractures are modeled by cohesive elements, making use of a traction-separation law together with a damage model to govern fracture propagation, while internal tangential and normal flows reproduce the fluid pressure. The finite element model is validated with analytical results and then used in a parametric study to analyze the influence of formation configuration, different material properties for the pay zone and barrier and pressure on fracture propagation.