Self-diffusion coefficients of methane or ethane mixtures with hydrocarbons at high pressure by NMR
- Nord-Troendelag Coll., Levanger (Norway). Dept. of Engineering
- Norwegian Univ. of Science and Technology, Trondheim (Norway). Dept. of Physical Chemistry
Self-diffusion coefficients have been measured in homogeneous mixtures of methane + hexane, ethane + hexane, methane + octane, ethane + octan, methane + decane, ethane + decane, and methane + hexane + benzene over the whole concentration range, at 303.2 K and 333.2 K and 30 MPa, 40 MPa, and 50 MPa. The experiments were performed in a glass cell by application of the NMR-PGSE technique. The estimated accuracy of the measurements is {+-}5%. Experimental self-diffusion coefficients were compared to the Sigmund correlation, which was found not to fit the experimental data. The main motivation for this work was the need for diffusion data in reservoir studies. Gas injection in heterogeneous or fractured reservoirs and gas diffusion through cap rock are processes where diffusion may play a significant role. Although these processes occur in porous oil- and water-saturated rock, diffusion data pertaining to bulk liquids are useful because the effect of the tortuosity of the rock can be represented by formation resistivity data. Moreover, a diffusion model at the molecular level can include rock-fluid interactions.
- OSTI ID:
- 256908
- Journal Information:
- Journal of Chemical and Engineering Data, Journal Name: Journal of Chemical and Engineering Data Journal Issue: 3 Vol. 41; ISSN JCEAAX; ISSN 0021-9568
- Country of Publication:
- United States
- Language:
- English
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