Pressure buildup during CO2 injection in brine aquifers using the Forchheimer equation
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- Imperial College London
- WorelyParsons
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- Document Type:
- Presentation
- Date:
- Received 10 December 2008 20:55 UTC; Posted 10 December 2008
- Subjects:
- Earth & Environment
- Abstract:
If geo-sequestration of CO2 is to be employed as a key emissions reduction method in the global effort to mitigate climate change, simple yet robust screening of the risks of disposal in brine aquifers will be needed. There has been significant development of simple analytical and semi-analytical techniques to support screening analysis and performance assessment for potential carbon sequestration sites. These techniques have generally been used to estimate the size of CO2 plumes for the purpose of leakage rate estimation. A common assumption has been that both the fluids and the geological formation are incompressible. Consequently, calculation of pressure distribution requires the specification of an arbitrary radius of influence. In this talk, a new similarity solution is derived using the method of matched asymptotic expansions. By allowing for slight compressibility in the fluids and formation, the solution improves on previous work by not requiring the specification of an arbitrary radius of influence. A large-time approximation of the solution is then extended to account for non-Darcy inertial effects using the Forchheimer equation. Both solutions are verified by comparison with finite difference solutions. The results show that inertial losses will often be comparable, and sometimes greater than, the viscous Darcy-like losses associated with the brine displacement, although this is strongly dependent on formation porosity and permeability.
- Collection:
- Virtual Conference on Climate Change and CO2 Storage
- Presented at:
- Virtual Conference on Climate Change and CO2 Storage, 03 December 2008
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- This document is licensed to the public under the Creative Commons Attribution 3.0 License
- How to cite this document:
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Mathias, Simon, Hardisty, Paul, Trudell, Mark, and Zimmerman, Robert. Pressure buildup during CO2 injection in brine aquifers using the Forchheimer equation. Available from Nature Precedings <http://dx.doi.org/10.1038/npre.2008.2634.1> (2008)
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