Pressure Buildup During CO2 Injection into a Closed Brine Aquifer
- ISSN: 0169-3913
- DOI: 10.1007/s11242-011-9776-z
CO2 injected into porous formations is accommodated by reduction in\nthe volume of the formation fluid and enlargement of the pore space,\nthrough compression of the formation fluids and rock material, respectively.\nA critical issue is how the resulting pressure buildup will affect\nthe mechanical integrity of the host formation and caprock. Building\non an existing approximate solution for formations of infinite radial\nextent, this article presents an explicit approximate solution for\nestimating pressure buildup due to injection of CO2 into closed brine\naquifers of finite radial extent. The analysis is also applicable\nfor injection into a formation containing multiple wells, in which\neach well acts as if it were in a quasi-circular closed region. The\napproximate solution is validated by comparison with vertically averaged\nresults obtained using TOUGH2 with ECO2N (where many of the simplifying\nassumptions are relaxed), and is shown to be very accurate over wide\nranges of the relevant parameter space. The resulting equations for\nthe pressure distribution are explicit, and can be easily implemented\nwithin spreadsheet software for estimating CO2 injection capacity.\n© 2011 Springer Science+Business Media B.V.