Newtonian fluid — Oil & Gas Glossary

A fluid that has a constant viscosity at all shear rates at a constant temperature and pressure, and can be described by a one-parameterrheologicalmodel. An equation describing a Newtonian fluid is given below. Water, sugar solutions, glycerin, silicone oils, light-hydrocarbon oils, air and other gases are Newtonian fluids. Most drilling fluids are non-Newtonian.