Rheologically Stable, Nontoxic, High-Temperature, Water-Based Drilling Fluid

Abstract

Summary An exceptionally stable, high-temperature, water-based drilling fluid has been developed based on a fundamental redesign of drilling fluid components and functions, while still using commercially available materials. Rheological stability was characterized by extensive Fann 50C low-shear-rate viscosity vs. temperature studies and supporting viscoelastic rheological data. The fluid has been used in both offshore and land applications, at temperatures as high as 420°F and densities as high as 15.5 lbm/gal.