CCS and Power Systems
Carbon Storage - Geologic Storage Technologies and Simulation and Risk Assessment
Validation of Models Simulating Capillary and Dissolution Trapping
Performer: Trustees of Colorado School of Mines
Project No: FE0004630
Researchers at the Colorado School of Mines and the Lawrence Berkeley National Laboratory are analyzing CO2 trapping data sets to verify models that simulate CO2 trapping mechanisms in heterogeneous porous reservoirs at an intermediate to large scale. The basic processes of CO2 trapping are not easily understood through field testing, so a set of multi-scale laboratory tests will be conducted to further analyze CO2 trapping mechanisms. The focus of this research will be to analyze capillary (Figure 1) and dissolution trapping (Figure 2) mechanisms since they are considered to be the most relevant processes facilitating permanent CO2 storage in the absence of geologic structural traps; the efficiency of capillary and dissolution trapping mechanisms is considered to be strongly affected by the heterogeneity of the storage formation. Capillary trapping involves CO2 being isolated in pore-space bubbles surrounded by formation water, and dissolution trapping involves CO2 being dissolved in the formation fluid. This project will supplement previous research with multi-phase injection flow experiments conducted at various scales. Small-scale experiments will identify the fundamental trapping processes in homogeneous systems and provide supplemental data for use in intermediate- and large-scale models to capture the capillary and dissolution trapping processes in storage media with pore-scale heterogeneities.