WCS Glossary
- Drooping Characteristic Curve
- Dry Gas
- Dry Hole
- Dual Completion
- Dual Gradient (DG)
- Dyna-Drill
- Dynamic Flow Check (DFC)
- Dynamic Fluid Flow
- Dynamic Formation Integrity Test (DFIT)
- Dynamic Head
- Dynamic Kill
- Dynamic Pore Pressure Test
- Effective Horsepower
- Effective Permeability
- Effectiveness
- Efficiency
- Elastomer Seals
- Electric Logging
- Electrolysis
- Elevation Head
- Elevation Pressure
- Elevation Profile
- Elevators
- Emergency Closure
- Emergency Disconnect System (EDS)
- Emergency Life Support Apparatus (ELSA)
- Emergency Shut Down (ESD)
- Emergency Shutdown Valves. (ESD)
- Emulsion
- End of Curve (EOC)
- Energy Consumption
- Enhanced Geothermal System (EGS)
- Entrained Gas
- Equal Percentage Valve
- Equalization Line or Loop
- Equalize
- Equivalent Circulating Density (ECD)
- Equivalent Mud Weight (EMW)
- Equivalent Static Density (ESD)
- Error Signal
- Established Reserves
- Ethane
- Euler’s Equation
- Expected Capacity
- Extended Reach Drilling (ERD)
- External Cutter
- Fault
- Feed-In
- Feedback Control System
- Fermentation