Modeling Stimulated Rock Volumes Using DPDK Approach Coupled With Rock Mechanics
Abstract
Modeling a hydraulically fractured unconventional tight sand reservoir is a coupled hydro-mechanical problem associated with complex interactions between dynamical fracture deformation under a loading condition and multiphase flow inside a fracture network. First, a DPDK model with numerical MINC (multiple interacting continua) algorithms is utilized to represent the pressure transient within the tight matrix and interporosity flow from the matrix into a hybrid system consisting of a complex fracture network. The flow model is coupled with a FEM stress code to model the dynamical changing of fracture aperture associated with increasing of the effective normal stress during the pressure depletion. Second, the choice of a coupling approach is critical because of the slow nonlinear convergence due to a significant increase in unknowns associated with poroelasticity equations. In this thesis, the iterative coupling is adopted to solve the multiphase flow and stress equations using parallel computations because of its flexibility and efficiency compared to the fully coupled approach. A hydraulic fracture deformation mechanical model is developed and implemented into the PRSI framework. The fracture network closure is approximated by the Barton-Bandis hyperbolic deformation model, coupled with a modified Cubic Law based on a contact theory and validated by an API proppant test on proppant conductivity under loading stress. Finally, numerical examples on hydraulic fracture deformation will be presented. The coupled fluid flow-rock mechanics will illustrate the degradation of the fracture conductivity due to the increasing of normal stresses for a variety of proppant types.
Description
Keywords
Engineering--Petroleum
Citation
Deng, H. (2016). Modeling Stimulated Rock Volumes Using DPDK Approach Coupled With Rock Mechanics (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/26950