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.