Numerical Simulation and Optimization of Gas Mobility Control Techniques During CO2 Sequestration in Cranfield

by Xueying Lu and Mohammad Lotfollahi

CO2 sequestration in subsurface often suffers from poor volumetric sweep efficiency due to low gas viscosity, low gas density, and formation heterogeneity. This study investigates CO2 mobility control techniques of Water Alternating Gas (WAG) and Surfactant (or Nanoparticle) Alternating Gas (SAG) to increase CO2 storage capacity in Cranfield via field-scale simulations and optimization. Continue reading

Adaptive Mesh Refinement with the Enhanced Velocity Method

by Benjamin Ganis

The enhanced velocity (EV) method is a useful way to directly construct a strongly flux-continuous velocity approximation between non-matching subdomain grids [2].  It is a straightforward method to implement based on a two-point flux approximation on Cartesian grids.  The EV method has recently been implemented in the IPARS simulator on a new type of discretization called semi-structured grids.  This enables powerful local mesh refinement capabilities, as well as dynamic adaptive mesh refinement (AMR). Continue reading