Investigation of steam and gas push mechanism in carbonate medium

2004-01-01
Canbolat, S.
Akın, Serhat
Polikar, M.
The addition of certain amounts of non-condensable gas to the steam assisted gravity drainage (SAGD) process has been known to reduce the steam consumption. The addition of small amounts of such gases (i.e. carbon dioxide) may improve oil recovery as the gas accumulates at the upper surface of the reservoir as a thin insulating layer, limiting the rate of front spreading at the corners of the steam chamber. Since the gas raises the pressure of the oil in the reservoir, it may be looked upon as pushing the oil downwards. This new concept has been called steam and gas push (SAGP). In order to investigate these phenomena, six experiments with or without carbon dioxide injection were conducted. Experiments were carried out in a scaled physical model packed with crushed limestone premixed with a 12.4°API heavy crude oil. Temperature, pressure and production data were continuously monitored during the experiments. The SAGP mechanism was detected at two different well spacings, when considerable carbon dioxide was added to steam with different steam/carbon dioxide injection ratios. However, as the distance between the injection and production wells increased, the volume needed to observe the SAGP phenomenon increased. In addition, the steam condensation temperature and the steam-oil ratio decreased, and the heavy oil become less mobile in the steam chamber, as the amount of carbon dioxide increased in the injection mixture. Thus, the heating period was prolonged, decreasing the cumulative amount as well as the rate of oil recovery. © Canadian International Petroleum Conference 2004, CIPC 2004.All Rights Reserved.
Citation Formats
S. Canbolat, S. Akın, and M. Polikar, “Investigation of steam and gas push mechanism in carbonate medium,” presented at the 5th Canadian International Petroleum Conference 2004, CIPC 2004, Calgary, USA, 2004, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85057431383&origin=inward.