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The method uses the gas temperature, pressure, z factor, and molecular weight, which have to be measured or calculated the density can be measured or calculated as well. This method lends itself for use in computer programs and spreadsheets.
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developed a useful analytical method that gives a good estimate of gas viscosity for most natural gases. 5 – Pseudocritical properties of methane-based natural gases (from Sutton ). 2 are corrections to be added to the atmospheric viscosity when the gas contains N 2, CO 2, and H 2S.įig. If only specific gravity is known, then the pseudocritical properties would have to be obtained from Fig.
VISCOSITY DEFINITION FULL
However, Kay’s rules require a full gas composition. to calculate the pseudocritical properties for use with those charts. It would not be correct, then, to use the methods of Sutton or Piper et al. ) are based on pseudocritical properties determined with Kay’s rules. 4) to obtain the viscosity at reservoir temperature and pressure. This viscosity is then multiplied by the viscosity ratio (from Fig. N = number of components in the gas mixture.M gi = molecular weight of the ith component of the gas mixture.μ i = viscosity of the ith component of the gas mixture at the desired temperature and atmospheric pressure (obtained from Fig.y i = mole fraction of the ith component.
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μ ga = viscosity of the gas mixture at the desired temperature and atmospheric pressure.2 or determined from the gas-mixture composition with Eq. The viscosity of gas mixtures at one atmosphere and reservoir temperature can either be read from Fig. 4 – Effect of temperature and pressure on viscosity of natural gases (from Carr et al.