American Petroleum Institute

Recommended Practice for Field Testing Oil-based Drilling Fluids - FIFTH EDITION
 N RP 13B-2

Annotation

This recommended practice provides standard procedures for determining the following characteristics of oilbased 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);