The electrokinetic potential of a particle as determined by its electrophoretic mobility.

This electric potential cause colloidal particles to repel each other and stay in suspension.

A very soluble salt used to increase the density of water to points more than double that of water.

Normally added to a system first saturated with calcium chloride.

A condition wherein the drilling fluid fails to form measurable gels during a quiescent time interval (usually 10 minutes)

The term “zone” as applied to reservoirs, is used to describe an interval which has one or more distinguishing characteristics, such as lithology, porosity, saturation, etc.