WCS Glossary
- Control
- Control Panel, Master or Primary
- Control Panel – Remote or Secondary
- Control System
- Control Valve
- Controlled Mud Level (CML) & Dual Gradient Drilling (DGD)
- Converting the Casing (Float Collar)
- Cooling
- Core
- Coriolis Flow Meters (CFM)
- Corrosion
- Corrosive Gasses
- Coupling
- Crater
- Critical Flow
- Critical Point
- Critical Pressure Differential
- Critical Velocity
- Critical Zone
- Crossover
- Crown Block
- Crude Oil
- Cup Packer
- Cup Tester or Cup Packer
- Cuttings
- Cyclic Surging
- Cyclone
- Darcy
- Darcy Equation
- Dart Valve
- Dead Band
- Dead Well
- Deadman
- Deflection
- Defoamer
- Degasser
- Degree-day
- Degree of Tolerance
- Dehydration
- Dehydrator
- Densitometer
- Density
- Depthometer
- Derrick
- Derrickman
- Desander
- Design Capacity
- Design Pressure
- Design Thermal Analysis (DTA)
- Determined Viscosity