WCS Glossary
- Spud
- Square Law
- Squeeze
- SSV
- Stab
- Stabilizer
- Stack
- Stand
- Standard Temperature
- Standpipe
- Starch
- Startup/Shutdown
- Static
- Static Fluid Level
- Static Gradient
- Static Head
- Static Head Pressure
- Static Hydraulics
- Static Pressure
- Static Resistance
- Station Bypass
- Station Differential
- Station Suction Valve
- Steady State
- Steady State Analysis
- Steady State Energy Equation
- Steady State Model
- Stearate
- Steep Characteristic Curve
- Stimulation
- Stop Work Authority
- Storm Choke
- Strand (API Spec 9A)
- Stress Corrosion Cracking
- String
- Stripper Head
- Stripper Rubbers
- Stripper Well
- Stripping
- Stripping In
- Stripping Out
- Stuck Pipe
- Studded Block
- Stuffing Box
- Sub
- Subsurface Safety Valve
- Sucker Rod
- Sucker Rod Pump
- Suction Control
- Suction Pit