API RP 13B-2

Description

This recommended practice provides standard procedures for determining the following characteristics of oil-based drilling fluids:
a) drilling fluid density (mud weight);
b) viscosity and gel strength;
c) filtration;
d) oil, water, and solids concentrations;
e) alkalinity, chloride concentration, and calcium concentration;
f) electrical stability;
g) lime and calcium concentrations, calcium chloride, and sodium chloride concentrations;
h) low-gravity solids and weighting material concentrations.
The annexes provide additional test methods or examples that can optionally be used for the determination of:
– shear strength (Annex A);
– oil and water concentrations from cuttings (Annex B);
– drilling fluid activity (Annex C);
– aniline point (Annex D);
– lime, salinity, and solids concentration (Annex E);
– sampling, inspection and rejection (Annex F);
– rig-site sampling (Annex G);
– cuttings activity (Annex H);
– active sulfide (Annex I);