Mud Definition

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Mud:

The liquid circulated through the wellbore during rotary drilling and workover operations.

In addition to its function of bringing cuttings to the surface, drilling mud cools and lubricates the bit and drill stem, protects against blowouts by holding back subsurface pressures, and deposits a mud cake on the wall of the borehole to prevent loss of fluids to the formation.

See drilling fluid.