Abstract
ABSTRACT Correlations are available in the literature for the prediction of reservoir brine viscosity as a function of temperature, pressure, and salinity. Despite the fact that natural gas is soluble in brines, little useful data has been published regarding the effect of dissolved gas on viscosity. In the current work, the effect of dissolved methane on the viscosity of pure water has been measured at 100, 150, and 250°F, over a saturation pressure range of 0-7500 psi. The viscosity was found to increase by up to 6% with gas saturation at moderate pressures. A correlation of this data is presented, along with a recommendation for the extension of the correlation to brine/natural gas systems. In addition, a simple modification to the standard electrical contact rolling ball viscoslmeter to allow its use with electrolyte solutions is described.
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