Terms, Abbreviations and Acronyms by N


NAAQS National Ambient Air Quality Standards
NACE  National Association of Corrosion Engineers
NGRC  National Geological Records Centre (United Kingdom)
NGDC  National Geoscience Data Centre (United Kingdom)
NHDA  National Hydrocarbons Data Archive (United Kingdom)
NIMS National Incident Management System
NIPP National Infrastructure Protection Plan
NIOSH National Institute for Occupational Safety, a US agency working to prevent work-related injury and illness
NOIA National Ocean Industries Association
NOAA National Oceanic and Atmospheric Administration
40 CFR Part 300 National Oil and Hazardous Substances Pollution Contingency Plan
NOC  National Oil Company
NOV National Oilwell Varco
NPDES National Pollutant Discharge Elimination System, authorized by the US Clean Water Act
NRDA National resource damage assessment
NRC National Response Corporation
NRT National response team
NTP National Toxicology Program
NWR National wildlife refuge
NGR  Natural Gamma Ray
NG  Natural Gas
NGH Natural gas hydrate (methane clathrate, or fire ice)
NGL  Natural Gas Liquids
NGPL Natural gas pipeline
NORM Naturally occurring radioactive material
33 CFR 142 Navigation and Navigable Waters, Workplace Safety and Health (US Regulation)
NAVIG  Navigational Log
NBR Near-bit reamer
NTU  Nephelometric Turbidity Unit
NHPV  Net Hydrocarbon Pore Volume
NPSH  Net Positive Suction Head
NPV Net present value
NRI  Net Revenue Interest
NEUT  Neutron Log
NFW  New Field Wildcat, Lahee classification
NPW  New Pool Wildcat, Lahee classification
NYMEX New York Mercantile Exchange
N Newton
NGSS  NGS Spectro Log
NGTR  NGT Ratio Log
NCDMB Nigerian Content Development and Monitoring Board
ND  Nipple Down
NOX Nitrogen oxides
NFG  ‘No Fucking Good’ used for marking damaged equipment, not to be confused with NG being natural gas
NFI  No Further Investment
NOISL  Noise Log
NB  Nominal Bore
NPS  Nominal Pipe Size (sometimes NS)
NASA  Non Active Side Arm (term used in the North Sea for kill wing valve on a Xmas tree)
NAPF  Non Aqueous Phase Fluid
NDE  Non Destructive Examination
NMDC  Non Magnetic Drill Collar
NP  Non Producing well (as opposed to P 
NRV  Non Return Valve
NCR Nonconformance report
NDT Nondestructive testing
NGO Non-governmental organization
NOW Non-hazardous oilfield waste
NMHC  Non-Methane Hydrocarbons
NMVOC  Non-Methane Volatile Organic Compounds
NPT Nonproductive time
NTHF  Non-Toxic High Flash
NMO Normal moveout offset (arrival time offset)
NORSOK Norsk Sokkels Konkurranseposisjon, standards for the Norwegian petroleum industry
PN North Padre Island Area Gulf of Mexico leasing area
NS  North Sea; can also refer to the North Slope Borough, Alaska, the North Slope, which includes Prudhoe Bay Oil Field (the largest US oil field), Kuparuk Oil Field, Milne Point, Lisburne, and Point McIntyre among others.
N/S North/south
NNS  Northern North Sea
NPD  Norwegian Petroleum Directorate
NIMBY Not in my backyard
NTE Not to exceed
NOI Notice of intent
NPR Notice of proposed rulemaking
NTL Notice to Lessees and Operators
NMR Nuclear magnetic resonance
NMR  Nuclear Magnetic Resonance Log