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Received January 25, 2014
Accepted July 9, 2014
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Density measurement and equal density temperature of CO2+brine from Dagang - formation from 313 to 363 K
Yi Zhang
Weiwei Jian†
Yangchun Zhan
Yongchen Song
Mingjun Yang
Jiafei Zhao
Yu Liu
Weiguo Liu
Yong Shen
Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian, Liaoning 116024, P. R. China
Korean Journal of Chemical Engineering, January 2015, 32(1), 141-148(8), 10.1007/s11814-014-0193-1
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Abstract
Densities of CO2+Dagang - formation brine solution were measured by a magnetic suspension balance (MSB) in the pressure range from (10 to 18) MPa, at the temperatures from (313.15 to 363.15) K and CO2 mass fractions at 0, 0.0101, 0.0198 and 0.0299. The experimental results revealed that the solution densities increased linearly with the increasing pressure and CO2 concentration, while decreasing with the increasing temperatures in the experimental range. When the temperature increased from (313.15 to 363.15) K, the slopes of the densities versus (vs.) CO2 mass fractions decreased from (0.193 to 0.106) g·cm-3. A correlation equation was developed based on thermodynamic theory and experimental data. The absolute average deviation between the correlation equation and the experimental data was 0.05%, and the maximum deviation was 0.37% for the density of CO2+water/brine solution in common_x000D_
geological storage conditions. According to the density of CO2 - free brine and apparent molar volume of CO2 in brine, the equal density temperature (Te) of CO2+Dagang brine solution was obtained at 464.67 K when pressure is 10MPa, which means that the density of brine dissolved with CO2 will be less than that of CO2-free brine when the temperature is higher than 464.67 K at 10MPa. In this work the formation temperature of the Dagang oilfield reservoir is from 313.15 K to 363.15 K, which is lower than the equal density temperature. Therefore, the safety of CO2 storage_x000D_
in Dagang oilfield reservoir can be guaranteed.
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