WCS Glossary
- Sack
- Safety Joint
- Safety Margin (Drilling)
- Safety Margin (Intervention, PCE)
- Safety Rams
- Safety Valve
- Safety Valves (Pop-Offs)
- Salt
- Sample Catcher
- Samples
- Sand
- Sand Content
- Sand Line
- Sandstone
- Scraper
- Scraper Pig
- Screen Liner
- SCSSV
- Seat, Casing
- Secondary Barrier
- Secondary Cementing
- Secondary Well Control
- Sediment and Water (S&W)
- Seismograph
- Self-Contained Breathing Apparatus (SCBA)
- Self-Fill (Auto-Fill) Float
- Semi-Submersible Rig
- Sensor
- Separator
- Series Configuration
- Set Casing
- Set Point
- Shale
- Shale Shaker
- Shaped Charge
- Shear Ram
- Shear Strength
- Sheave
- Shipping Pumps
- Shoe
- Shoot
- Short-Term Exposure Limit (STEL)
- Shut In
- Shut-In Casing Pressure (SICP)
- Shut-In Drillpipe Pressure (SIDPP)
- Shut-In Tubing Pressure (SITP)
- Shut-off Head
- Shutdown Valves, Emergency
- SICP
- Sidetrack