Viscosity Prediction of Natural Gas Using the Friction Theory

Claus Kjær Zeberg-Mikkelsen, Sergio Cisneros, Erling Halfdan Stenby

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Based on the concepts of the friction theory (f-theory) for viscosity modeling, a procedure is introduced for predicting the viscosity of hydrocarbon mixtures rich in one component, which is the case for natural gases. In this procedure, the mixture friction coefficients are estimated with mixing rules based on the values of the pure component friction coefficients. Since natural gases contain mainly methane, two f-theory models are combined, where the friction coefficients of methane are estimated by a seven-constant f-theory model directly fitted to methane viscosities, and the friction coefficients of the other components are estimated by the one-parameter general f-theory model. The viscosity predictions are performed with the SRK, the PR, and the PRSV equations of state, respectively. For recently measured viscosities of natural gases, the resultant AAD (0.5 to 0.8%) is in excellent agreement with the experimental uncertainty (+/-1.0%). The AAD is found to be higher for older measurements (around 3.5%), due mainly to the higher experimental uncertainties and problems with some of the measurements. Overall, the results are satisfactory for most industrial applications related to natural gases.
Original languageEnglish
JournalInternational Journal of Thermophysics
Volume23
Issue number2
Pages (from-to)437-454
ISSN0195-928X
DOIs
Publication statusPublished - 2002

Keywords

  • f-theory
  • Hydrocarbon
  • Natural gas
  • Petroleum fluid
  • Prediction
  • Viscosity

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