4. Glossary
Bentonite; Bentonite
Very fine clay used to prepare drilling muds, with thixotropic properties to support hole walls and transport cuttings.
Drilling Mud; Boue de forage
Fluid used during drilling to evacuate cuttings, cool and lubricate the tool, and stabilize the hole walls.
Cake; Filter Cake
Deposition of fine drilling mud particles on the hole walls, forming a barrier that stabilizes the hole and limits fluid loss.
Tungsten carbide; Carbide de tungstène
Extremely hard material used for cutting tools in soft to medium-hard formations.
Core drilling; Coring
The process of extracting a cylindrical sample of rock, called a "core", for geological or geotechnical analysis....
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