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Indexed by:会议论文

Date of Publication:2010-06-20

Included Journals:EI、Scopus

Volume:1

Page Number:1103-1107

Abstract:Carbon dioxide geological sequestration is considered to be one of the feasible options for reducing greenhouse gas emissions. The density of aqueous CO2 solution is a key parameter for CO2 geological sequestration. Magnetic suspension balance was applied to obtain the densities of CO2 solutions accurately under reservoir conditions. In the experiments the temperature is between 30   C and 60   C and the pressure is between. 10 Mpa and 20 Mpa when CO2 mass fraction is equal to 0, 0.5% and 2% respectively. From the experimental data it is found that the density of aqueous solutions increases linearly with the increase of pressure at a constant CO2 mass fraction and the rate of the increase at different pressures is almost the same. The density of CO2 aqueous solutions also shows an increasing trend with the increase of CO2 mass fraction. In the pressure range of 10 to 20 Mpa, the ratio of CO 2-bearing water density with respect to CO2-free water density is independent of the pressure. The proposed model for CO2 aqueous solution density was therefore based on the CO2 mass fraction and temperature, without including the pressure term. Compared with the experimental data, it is found that the average relative error is 0.021%. The results demonstrate that the model can work well for CO2 geological sequestration. Copyright ? 2010 by The International Society of Offshore and Polar Engineers (ISOPE).