WCS Glossary
- Mast
- Master Bushing
- Master Choke Line Valve
- Master Gate
- MAWP
- Maximum Allowable Annular Surface Pressure (MAASP)
- Maximum Allowable Mud Weight (MAMW)
- Maximum Allowable Working Pressure (MAWP)
- Maximum Anticipated Static Bottomhole Temperature (MABHT)
- Maximum Anticipated Surface Pressure (MASP)
- Maximum Anticipated Wellhead Temperature (MAWHT)
- Maximum Expected Surface Pressure (MESP)
- Maximum Expected Wellbore Temperature (MEWT)
- Maximum Operating Pressure (MOP)
- Maximum Operational Surface Back Pressure (MOSBP)
- Maximum Planned Surface Injection Pressure (MPSIP)
- Maximum Safe Working Temperature (MSWT)
- Mean Effective Pressure
- Mean Pressure
- Mean Temperature
- Measurement While Drilling
- Mechanical Barrier
- Mechanical Efficiency
- Mechanical Energy
- Mechanical Jar
- Mechanical Losses
- Mechanical Vapor Plug
- Mechanical Work
- Membrane Nitrogen
- Meter
- Meter Banks
- Meter Factor
- Meter Multiplier
- Meter Prover
- Meter Run
- Meter Stack
- Metering
- Metering Manifold
- Methane
- Mica
- Mill
- Mist Drilling
- Momentum
- Montmorillonite
- Moody Diagram
- Motor
- Motor Actuators Electric/Electronic
- Mousehole
- Mpd Operations Matrix
- Mud