M
- M or m – prefix designating a number in thousands (not to be confused with SI prefix M for mega- or m for milli)
- m – metre
- MAASP – Maximum Acceptable Annular Surface Pressure
- MAC – Multipole Acoustic Log
- MACL – Multiarm Caliper Log
- MAGST – Magnetostratigraphic Report
- MAOP – Maximum Allowable Operating Pressure
- MARA – Maralog
- MAWP – Maximum Allowable Working Pressure
- Mbd – thousand barrels (of oil) per day
- Mbod – thousand barrels of oil per day
- Mboed – thousand barrels of oil equivalent per day
- MBRO – Multi-Bore Restriction Orifices
- MBT – Methylene Blue Test
- MCD – Mechanical Completion Dossier
- Mcf – thousand cubic feet of natural gas
- Mcfe – thousand cubic feet of natural gas equivalent
- MCHE – Main Cryogenic Heat Exchanger
- MCM – Manifold Choke Module
- MCS – Manifold & Connection System
- MCS – Master Control Station
- mD – millidarcy, measure of permeability, with units of area
- MD – Measured Depth (see also MDSS)
- MD – Measurements/Drilling Log
- MDEA – Methyl Diethanolamine (aMDEA)
- MDL – Methane Drainage Licence (United Kingdom), a type of onshore licence allowing natural gas to be collected "in the course of operations for making and keeping safe mines whether or not disused"
- MDSS – Measured Depth Sub-Sea
- MDT – Modular formation Dynamic Tester
- MEA – Monoethanolamine
- MEG – Mono-Ethylene Glycol
- MEPRL – Mechanical Properties Log
- MERCR – Mercury Injection Study Report
- MERG – Merge FDC/CNL/Gamma Ray/Dual Laterolog/Micro SFL Log
- MEST – MEST Log
- MF – Marsh Funnel (mud viscosity)
- MFCT – Multifinger Calliper Tool
- MGL – Magnelog
- MLH – Mud Liner Hanger
- MIFR – Mini Frac Log
- MINL – Minilog
- MIPAL – Micropalaeo Log
- MIRU – Move In and Rig Up
- MIST – Minimum Industry Safety Training
- MIYP – Maximum Internal Yield Pressure
- mKB – Meters below Kelly Bushing
- ML – Microlog, or Mud Log
- MLL – Microlaterolog
- MLF – Marine Loading Facility
- MM or mm – prefix designating a number in millions (or SI unit – millimetre)
- MMbd – million barrels per day
- MMbod – million barrels of oil per day
- MMcf – million cubic feet (of natural gas)
- MMcfe – million cubic feet (of natural gas equivalent)
- MMS – Minerals Management Service, (United States)
- mmscfd – million standard cubic feet per day
- MMTPA – Millions of Metric Tonnes per Annum
- mmstb – million stock barrels
- MNP – Merge and Playback Log
- MODU – Mobile Offshore Drilling Unit
- MOF – Marine Offloading Facility
- MOPU – Mobile Offshore Production Unit
- MOT – Materials/Marine Offloading Terminal
- MPA – Micropalaeo Analysis Report
- MPD – Managed Pressure Drilling
- MPFM – Multi-Phase Flow Meter
- MPK – Merged Playback Log
- MPP – Multiphase Pump
- MPQT – Manufacturing Procedure Qualification Test
- MPS – Manufacturing Procedure Specification
- MPV – Multi Purpose Vessel
- MQC – Multi Quick Connection Plate
- MR – Marine Riser, (Morning report)
- MRCV – Multi Reverse Circulating Valve
- MRIRE – Magnetic Resonance Image Report
- MRR - Material Receipt Report
- MSCT – MSCT Gamma Ray Log
- MSFL – Micro SFL Log
- MSI – Mechanical and Structural Inspection
- MSIPC – Multi Stage inflatable Packer Collar
- MSL – Mean Sea Level
- MSL – Micro Spherical Log
- MSS – Magnetic Single Shot
- MST – MST EXP Resistivity Log
- MTT – MTT Multi-Isotope Trace Tool
- MUD – Mud Log
- MUDT – Mud Temperature Log
- MuSol – Mutual Solvent
- MVB – Master Valve Block on Xmas Tree
- MW – Mud weight
- MWD – Measurement While Drilling
- MWDRE – Measurement While Drilling Report
- MWS – Marine Warranty Survey
Read more about this topic: List Of Oil Field Acronyms