Many geoscientists endorse Carbon Capture and Storage (CCS) as a potential strategy
for mitigating emissions of greenhouse gases. Deep saline aquifers have been reported to
have larger CO
2 storage capacity than other formation types because of their availability
worldwide and less competitive usage. This work proposes an analytical model for screening
potential CO
2 storage sites and investigates injection strategies that can be employed to
enhance CO
2 storage.
The analytical model provides of estimates CO 2
storage efficiency, formation pressure
profiles, and CO 2
–brine interface location. The results from the analytical model were
compared to those from a sophisticated and reliable numerical model (TOUGH 2
). The
models showed excellent agreement when input conditions applied in both were similar.
Results from sensitivity studies indicate that the agreement between the analytical model
and TOUGH2 strongly depends on irreducible brine saturation, gravity and on the relationship
between relative permeability and brine saturation.
A series of numerical experiments have been conducted to study the pros and cons of
different injection strategies for CO 2 storage in confined saline aquifers. Vertical, horizontal,
and joint vertical and horizontal injection wells were considered. Simulations results
show that horizontal wells could be utilized to improve CO 2 storage capacity and efficiency
in confined aquifers under pressure-limited conditions with relative permeability
ratios greater than or equal to 0:01. In addition, joint wells are more efficient than single
vertical wells and less efficient than single horizontal wells for CO 2 storage in anisotropic
aquifers.
| Identifer | oai:union.ndltd.org:USF/oai:scholarcommons.usf.edu:etd-4895 |
| Date | 30 September 2009 |
| Creators | Okwen, Roland Tenjoh |
| Publisher | Scholar Commons |
| Source Sets | University of South Flordia |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Graduate Theses and Dissertations |
| Rights | default |
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