Pressure-Dependent Yield Stress of Organoclay-Based Gels.

ABSTRACT: We provide a detailed investigation of the pressure and temperature dependence of flow curves and, in particular, of the yield stress, σ_y, of a model drilling fluid formulation and the parent colloidal dispersion. We carefully considered the limitations of the high-pressure cell and designed reliable protocols covering a pressure range up to 100 MPa and a temperature range up to 85 °C. For both systems, the viscosity at high shear rates increased with pressure, scaling well with the pressure dependence of the solvent viscosity. For clay dispersions, σ_y increases slightly with temperature at a given pressure and much more with pressure across the whole temperature range (25-85 °C). For the drilling fluid formulation, σ_y increases with pressure and decreases

SUBMITTER: Burger NA 

PROVIDER: S-EPMC12356070 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature