2- RHEOLOGY
((The laboratory measured mud parameters))
a-Funnel Viscosity (vis)
b-Plastic Viscosity (PV)
c- Yield Point (YP)
d- Gel strength
e- ph
f- Filtration
g- Alkalinity
h- Chloride Content
i– Calcium
j- Retort
b-Plastic viscosity (Pv)
is that part of flow resistance in a mud caused primarily by the friction between the suspended particles and by the viscosity of the continuous liquid phase. i.e. it is a representation of the concentration, size and shape of the solid particles.
c-Yield point (Yp)
is a measurement under flowing conditions of the forces in the mud which cause gel structure to develop when the mud is at rest.
- d-Gel strength (Gel)
is a measurement under static conditions of the forces in the mud which cause gel structure to develop when the mud is at rest. 
e- pH
is a measure of acidity or alkalinity of drilling mud as expressed in the hydrogen ion concentration . It is used as an aid in determining for type of mud treatment and as indication of contaminants such as cement, gypsum .
f- Filtration (Wl)
is a measurement liquid filtrate of the drilling mud. It measure the ability of the solid components to form a thin, low permeability filter cake.