Viscosity Prediction of Natural Gases

On the Viscosity of Natural Gases from Qatari North Field Reservoir

“…Moreover, to obtain accurate measurements of gas viscosity, especially for HPHT conditions, is very difficult, from a experimental viewpoint, and expensive. , Therefore, the analysis of published viscosity data found in the open literature shows that it is very limited in terms of both experimental conditions and quantity (see Atilhan et al and references therein), and in some cases their accuracy is unknown. Thus, the common practice in the natural gas industry is to estimate viscosity from available correlations and predictive methods that are based on available laboratory data. − Nevertheless, the predictive methods commonly applied in the industry have a reduced range of applicability, both in pressure−temperature conditions and mixtures’ composition, and thus their application for HPHT conditions or for mixtures not previously tested may be doubtful. ,, Therefore, the available viscosity models do not satisfy the current industrial requirements for flow assurance and reliable reservoir characterizations. The development of accurate and reliable natural gas viscosity models, or testing of the available ones, stands on the availability of experimental data, measured for wide pressure−temperature ranges, for mixtures selected in a systematic way to infer the effects of the different components on the mixtures’ viscosity, which compositions represent relevant reservoirs.…”

“…Thus, the common practice in the natural gas industry is to estimate viscosity from available correlations and predictive methods that are based on available laboratory data. [12][13][14] Nevertheless, the predictive methods commonly applied in the industry have a reduced range of applicability, both in pressure-temperature conditions and mixtures' composition, and thus their application for HPHT conditions or for mixtures not previously tested may be doubtful. 7,11,15 the available ones, stands on the availability of experimental data, measured for wide pressure-temperature ranges, for mixtures selected in a systematic way to infer the effects of the different components on the mixtures' viscosity, which compositions represent relevant reservoirs.…”