Rheologically Stable, Nontoxic, High-Temperature Water-Base Drilling Fluid
1997
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 offshore and land applications, at temperatures as high as 420 F and densities as high as 15.5 lbm/gal.
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