Phase Equilibria for the CO2/CH4/N2/H2O System in the Hydrate Region under Conditions Relevant to Storage of CO2 in Depleted Natural Gas Reservoirs
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- 作者：Duo Sun ; John Ripmeester ; Peter Englezos
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2016
- 出版时间：December 8, 2016
- 年：2016
- 卷：61
- 期：12
- 页码：4061-4067
- 全文大小：429K
- ISSN：1520-5134
文摘
The CO2, CO2/CH4, CO2/N2, and CO2/N2/CH4 hydrate equilibria were determined in a stirred high-pressure vessel (autoclave) for temperatures similar to those in depleted natural gas reservoirs in the Alberta portion of the Western Canada Sedimentation basin in Canada. In addition, the equilibrium hydrate formation conditions were also determined by differential scanning calorimetry under a constant pressure of 3200 kPa. Also, experiments with saline water corresponding to 2 and 4 wt % of NaCl solution were used in order to simulate more realistic reservoir conditions. Equilibrium conditions in the autoclave system show a ±40 kPa agreement with the calculated values using CSMGem software. Similarly, the hydrate dissociation temperatures measured with differential scanning calorimetry show ±0.2 K agreement with the calculated values. The increase in salinity was found to shift the equilibrium to less favorable conditions and to decrease the amount of hydrate formed.