High pressure guided falling body viscometer. Representation of alkanes viscosity as a function of temperature and pressure

Abstract

A guided falling body viscometer developed in our laboratory for the measure of the viscosity coefficient of liquids (up to 400MPa; temperature range: -10 to 200°C) is described here.

This study presents a method developed from experimental results concerning the viscosity of pure linear alkanes (n-C₁₀ to n-C₁₈) and their mixtures in reservoir fluid conditions (up to 100MPa and 20 to 100°C). For such groups, we propose a representative formulation (based on a Vogel type analytical expression and using the same set of empirical coefficients for all compounds) which needs only knowledge of molecular weight.