API RP 13B-1

API RP 13B-1 provides standard procedures for determining the following characteristics of water-based drilling fluids:a) drilling fluid density (mud weight);b) viscosity and gel strength;c) filtration;d) water, oil and solids contents;e) sand content;f) methylene blue capacity;g) pH;h) alkalinity and lime content;i) chloride content;j) total hardness as calcium.Annexes A, B, C and E provide additional test methods which may be used for:k) chemical analysis for calcium, magnesium, calcium sulfate, sulfide, carbonate, potassium;l) determination of shear strength;m) determination of resistivity;n) drill pipe corrosion monitoring.Annexes D, F, G and H provide procedures that may be used for:o) removal of air;p) sampling, inspection and rejection;q) rig-site sampling;r) calibration and verification of glassware, thermometers, viscometers, retort kit cup and drilling fluid balances.