drilling mud
drilling fluid

It captures and separates large volume of free gas within the drilling fluid.

Degasser: a device that separates air and/or gas from the drilling fluid.

The drilling fluid used for a particular job is selected to avoid formation damage and to limit corrosion.

Heavy drilling fluid, called mud, kept disappearing into formation cracks.

When the circulation stops, the solids still remain suspended in the drilling fluid.

In conventional drilling fluids, barite is used to increase the density (weight).

The other major variable is the rheology of the drilling fluid.

Both of these are generally only used when either fresh or brine water is being used for the drilling fluid.

Oil based mud is a drilling fluid used in drilling engineering.

To achieve accuracy the drilling fluid needs time to reach the ambient temperature.