API RP 13B-2 (R2010)

This Recommended Practice provides standard procedures for determining the following characteristics of oil-based drilling fluids:

-drilling fluid density (mud weight);

-viscosity and gel strength;

-filtration;

-oil, water and solids contents;

-alkalinity, chloride content and calcium content;

-electrical stability;

-lime and calcium contents, calcium chloride and sodium chloride contents;

-low-gravity solids and weighting material contents.