A High‐Temperature, High‐Pressure Oscillating‐Disk Viscometer for Concentrated Ionic Solutions

Abstract

In this paper we describe a new, high‐precision oscillating‐disk viscometer which has been designed specifically to measure the viscosity of concentrated ionic solutions at temperatures extending to 300°C and to pressures of 35 MPa, simultaneously. The viscometer is intended to provide reliable values of the viscosity of a wide spectrum of aqueous salt solutions under conditions similar to those prevailing in hydrothermal geothermal reservoirs. Results of preliminary calibration runs are included. They indicate that the behavior of the viscometer is reliable and satisfactory. This is further confirmed by new measurements of the viscosity of liquid water up to 200°C and 30 MPa.