WCS Glossary
- Abnormal Pressure
- Absolute Permeability
- Absolute Pressure
- Absolute Temperature
- Absolute Viscosity
- Absolute Zero Temperature
- Absorption
- Acceleration
- Accelerator
- Accredited Training
- Accumulator
- Acetic Acid
- Acetylene Welding
- Acid
- Acid Fracture
- Acid Treatment
- Acidity
- Acidize
- Acoustic Survey
- Active data
- Active Pits
- Actuators
- Adapter Spool
- Adequately Ventilated Area
- Adiabatic
- Adiabatic Efficiency
- Adjustable Choke
- Adjustable Spacer Sub
- Adsorption
- Advanced Geothermal System (AGS)
- Aeration
- Affinity Laws
- Aftercooler
- Agglomerate
- Aggregate
- Air Cutting
- Air-Tube Clutch
- Alkali
- Alkalinity
- Aluminum Stearate
- Ambient Temperature
- American Petroleum Institute (API)
- American Standard Code for Information Interchange (ASCII)
- Analysis, Mud Or Drilling Fluid
- Anchor
- Anchor Seal Assembly
- Angle Of Deflection
- Anhydrite
- Anhydrous
- Aniline Point