Changes

==Properties of fluids==

==Properties of fluids==

The large number of functions performed by the drilling fluid require that some minimum properties of the fluids be maintained. The measurement of these properties gives the mud engineer a “status report” of the fluid and how it is reacting with the formation and the subsurface environment. The most critical of the properties are density, viscosity, fluid loss control, and chemical composition.

The large number of functions performed by the drilling fluid require that some minimum properties of the fluids be maintained. The measurement of these properties gives the mud engineer a “status report” of the fluid and how it is reacting with the formation and the subsurface environment. The most critical of the properties are density, [[viscosity]], fluid loss control, and chemical composition.

===Density===

===Density===