WCS Glossary
- Sidewall Coring
- Sight Windows
- Simultaneous Operations (SIMOPS)
- Single
- Single Stage Pump
- Sinker Bar
- Skid
- Skin
- Slack Pipeline
- Slickline
- Slips
- Sloughing
- Slow Circulation Rate (SCR)
- Slug
- Slug Flow
- Slurry
- SMYS
- Snub
- Snubbing
- Snubbing Unit
- Sodium Bicarbonate
- Sodium Carbonate
- Sodium Chloride
- Sodium Hydroxide
- Soft Shut In
- Soft Shutdown
- Soft Start
- Solids Concentration
- Solids Control Equipment
- Solubility
- Sonic Flow Meter
- Sonic Logging
- Sonic Wave Speed
- Sour
- Sour Fluids (handling)
- Sour Gas
- Sour Water (handling)
- Source
- Space Out
- Spacer Spool
- Spear
- Specific Gravity
- Specific Heat
- Specific Heat Ratio
- Specific Speed
- Specific Weight
- Spider
- Spinning Chain
- Spitzglas Formula
- Spontaneous Potential (SP)