HR: 1340h
AN: H13F-1650    [Abstracts]
TI: Simulations of Carbon Dioxide Leakage from Uncased Boreholes Into Formations Lying Above a Sequestration Reservoir.
AU: * Stauffer, P H
EM: stauffer@lanl.gov
AF: Los Alamos National Laboratory, Mail Stop T-003, Los Alamos, NM 87025, United States
AU: Pawar, R J
EM: rajesh@lanl.gov
AF: Los Alamos National Laboratory, Mail Stop T-003, Los Alamos, NM 87025, United States
AU: Zyvoloski, G A
EM: gaz@lanl.gov
AF: Los Alamos National Laboratory, Mail Stop T-003, Los Alamos, NM 87025, United States
AB: We present calculations showing how leakage of CO₂ up an uncased section of a borehole can move into formations overlying a sequestration reservoir. Relationships between the invaded formation permeability structure, phase-state of the CO₂ in the borehole at the depth of contact, and reservoir pressure are explored. Preliminary results suggest that the most important parameters governing the invasion of borehole CO₂ into formations are 1) the pressure gradient between the borehole fluids and the formation waters, and 2) the relative permeability to the available phase that is being transported from the borehole to the surrounding formation. We show that fractured formations overlying a storage reservoir are the most likely to allow significant invasion when leaking boreholes are overpressured with single phase CO₂. Finally, we discuss how these results can be abstracted into a system modeling approach during the performance assessment phase of CO₂ sequestration site selection.
DE: 1807 Climate impacts
DE: 1834 Human impacts
DE: 1847 Modeling
SC: Hydrology [H]
MN: 2007 Fall Meeting