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| Diffusion law and measurement of variable diffusion coefficient of CO2 in oil |
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ZHAO Renbao1, AO Wenjun2, XIAO Aiguo1, YAN Wei1, YU Zhihai1,3, XIA Xiaoting1
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(1.State Key Laboratory of Petroleum Resource ＆ Prospecting, China University of Petroleum, Beijing 102249, China;2.Engineering Technology Company of CNOOC Energy Technology ＆ Services Limited, Tianjin 3000452, China;3.CNPC Bohai Drilling Engineering Company Limited, Tianjin 3000457, China)
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| Abstract: |
| A mathematical model of variable diffusion coefficient of CO2 which can be used in bulk and porous media was established through the experiment and theoretical calculation. The variable diffusion coefficients of CO2 in oils with different viscosity were calculated with this developed model. In order to validate this model, a traditional model of constant diffusion coefficient was used to calculate the average diffusion coefficient. The calculations with MATLAB software for the two models to analyze the diffusion coefficients and diffusion behaviors were also compared. The results show that the greater the viscosity of crude oil, the smaller the diffusion coefficient and the longer the diffusion equilibrium time. Diffusion behaviors of real condition, which contains unstable and stable stages, can be explained by the variable diffusion coefficient model with better results. |
| Key words: diffusion coefficient CO2 Fick law mass-transfer |
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