ISO 10414-2:2011 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 concentrations,
alkalinity, chloride concentration and calcium concentration,
electrical stability,
lime and calcium concentrations, calcium chloride and sodium chloride concentrations,
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
oil and water concentrations from cuttings,
drilling fluid activity,
aniline point,
lime, salinity and solids concentration,
sampling, inspection and rejection,
rig-site sampling,
cuttings activity,
active sulphides,
calibration and verification of glassware, thermometers, viscometers, retort kit cups and drilling fluid balances,
permeability plugging apparatus with set-screw secured end cap,
permeability plugging apparatus with threaded end cap,
elastomer compatibility,
sand content of oil-based fluid,
identification and monitoring of weight-material sag,
oil-based drilling fluid test report form.