WCS Glossary
- Rabbit
- Rack Pipe
- Radioactivity Well Logging
- Ram
- Ramping
- Rankine (degrees temperature)
- Rate of Penetration (ROP)
- Rate of Rise
- Rated Working Pressure (RWP)
- Rathole
- RCD System
- Reactive MPD
- Real-time Model
- Ream
- Reciprocating Compressor
- Reciprocating Pump
- Recoverable Energy
- Recycle Line
- Reeled Tubing
- Reeve
- Reference Level
- Regulator
- Relative Roughness
- Relief Valve
- Relief Well
- Remote Choke Panel
- Remote Control
- Remote Station
- Remote Terminal Unit (RTU)
- Remotely Operated Vehicle (ROV)
- Report by Exception
- Reservoir
- Reservoir Pressure
- Resistivity
- Responsible Party
- Retainer
- Retarder
- Return System
- Reverse Circulation
- Reynolds Number
- Rheology
- Rig
- Riser
- Riser Gas
- Riser Pipe
- Rising Characteristic Curve
- Risk Management
- Rock Matrix
- Roller-Cone Bit
- Rotary Drilling