TY - GEN
T1 - Geological sequestration of carbon dioxide in depleted gas reservoirs
AU - Sobers, L. E.
AU - Frailey, S. M.
AU - Lawal, A. S.
N1 - Funding Information:
The authors wish to expree their gratitude to the U.S. Department of Energy for sponsoring this study through reaserch grant No. DE-FC26-01NT41145 to the Center for Applied Petrophysical and Reservoir Studies at Texas Tech University. Special thanks go to Seguntayo Ogunsanya for assisting in the preparation of the document.
Publisher Copyright:
© 2004, Society of Petroleum Engineers Inc.
PY - 2004
Y1 - 2004
N2 - The purpose of this paper is to investigate the effects of phase behavior on the sequestration CO2 of in depleted gas reservoirs (dry gas, wet gas and retrograde gas). Carbon dioxide sequestration in depleted and abandoned gas reservoirs can accomplish two important objectives. Firstly, it could be important part of present climate control initiative to reduce the concentration of carbon dioxide in the atmosphere. Secondly, it could be instrumental to enhance gas and condensate recovery. Using the pressure-temperature diagrams and two phase flash calculations, the phase behavior of natural gas-carbon dioxide mixtures were analyzed to provide enlightenment on the sequestration process. From analysis of simulated results, it was found that carbon dioxide exhibited a drying effect on wet and retrograde gas mixtures and a wetting effect on dry gas. The results for retrograde gas condensate depended on the composition of reservoir fluids at abandonment conditions. The main difference being the liquid volume present with increasing pressure and carbon dioxide concentration. This influenced the volume of condensate vaporized with addition of carbon dioxide. It was also determined that carbon dioxide lowers the compressibility factor of all gas types. These results are favorable for carbon dioxide sequestration because decreasing compressibility factors represents increasing storage capacity.
AB - The purpose of this paper is to investigate the effects of phase behavior on the sequestration CO2 of in depleted gas reservoirs (dry gas, wet gas and retrograde gas). Carbon dioxide sequestration in depleted and abandoned gas reservoirs can accomplish two important objectives. Firstly, it could be important part of present climate control initiative to reduce the concentration of carbon dioxide in the atmosphere. Secondly, it could be instrumental to enhance gas and condensate recovery. Using the pressure-temperature diagrams and two phase flash calculations, the phase behavior of natural gas-carbon dioxide mixtures were analyzed to provide enlightenment on the sequestration process. From analysis of simulated results, it was found that carbon dioxide exhibited a drying effect on wet and retrograde gas mixtures and a wetting effect on dry gas. The results for retrograde gas condensate depended on the composition of reservoir fluids at abandonment conditions. The main difference being the liquid volume present with increasing pressure and carbon dioxide concentration. This influenced the volume of condensate vaporized with addition of carbon dioxide. It was also determined that carbon dioxide lowers the compressibility factor of all gas types. These results are favorable for carbon dioxide sequestration because decreasing compressibility factors represents increasing storage capacity.
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M3 - Conference contribution
AN - SCOPUS:85055884750
SN - 9781555639884
T3 - Proceedings - SPE Symposium on Improved Oil Recovery
BT - Society of Petroleum Engineers - SPE/DOE Symposium on Improved Oil Recovery 2004, IOR 2004
PB - Society of Petroleum Engineers (SPE)
T2 - SPE/DOE Symposium on Improved Oil Recovery 2004, IOR 2004
Y2 - 17 April 2004 through 21 April 2004
ER -