Affiliation:
1. Faculty of Drilling, Oil and Gas, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland
Abstract
Carbon dioxide capture, use, and storage (CCUS) issues are currently gaining more attention due to climate change. One of the CCUS methods may be the use of CO2 as cushion gas in underground gas storage (UGS). Typically, high-permeability structures are preferable for gas storage purposes. High permeability ensures good flow in reservoirs and well bottom-hole pressure maintenance. However, in the case of the use of CO2 as a part of the cushion gas, it mixes with natural gas within the reservoir pore space, and high permeability, with the resulting “ease of flow”, can accelerate the migration of CO2 to the near-well zone. For this reason, the analysis of the effect of permeability on CO2 content in withdrawal gas and the overall performance of UGS seems to be of high importance. In this study, we used a compositional numerical simulator to evaluate the effects of not only permeability but also pore structure on gas storage of this type. The simulations covered depletion of the reservoir and 10 cycles of UGS operation. Our results show that the structure (and thus permeability) has a great influence on the migration of CO2 within a reservoir, the mixing zone, and CO2 content in withdrawal gas.
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
Reference21 articles.
1. Underground gas storage as an element national gas system;Kaliski;Nafta-Gaz,2010
2. Underground gas storages and their function in gas sector;Nagy;Rynek Energii,2009
3. Bennion, D.B., Thomas, F.B., Ma, T., and Imer, D. (2000, January 3–5). Detailed Protocol for the Screening and Selection of Gas Storage Reservoirs. Proceedings of the SPE/CERI Gas Technology Symposium, Calgary, AB, Canada.
4. Laille, J.P., Molinard, J.E., and Wents, A. (1988, January 13–15). Inert Gas Injection as Part of the Cushion of the Underground Storage of Saint-Clair-Sur-Epte. Proceedings of the SPE Gas Technology Symposium, Dallas, TX, USA.
5. Carbon Dioxide as Cushion Gas for Natural Gas Storage;Oldenburg;Energy Fuels,2003