Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
1988 LL Protocol
Definition(s)
1988 LL Protocol
1988 LL Protocol means the Protocol of 1988 relating to the International Convention on Load Lines, 1966, as amended. Source: IMO Resolution A.1023(26), Code for the Construction and Equipment of Mobile Offshore Drilling Units (2009 MODU Code), 2009. Global StandardsN
Definition(s)
n
Number of pad eyes/lifting set legs. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsN (Heat-Treat Process)
Definition(s)
N (Heat-Treat Process)
Full-body, full-length normalised. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global StandardsN&T
Definition(s)
N&T
Normalised and tempered. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global StandardsN/A
Definition(s)
NA
Not applicable. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards Source: API SPEC 5CRA, Specification for Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock, Upstream Segment, First Edition, February 2010 (Errata August 2011). Global Standards Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsN/A
Not applicable. Source: API RP 17L2, Recommended Practice for Flexible Pipe Ancillary Equipment, First Edition, March 2013. Global StandardsNABIS
Definition(s)
NABIS
Natuurlijke bronnen van ioniserende straling. Natural sources of ionizing radiation. Source: NOGEPA Industrial Guideline No. 16, Working with Naturally Occurring Radioactive Materials (NORM), Netherlands, Version 1, January 2009. Global StandardsNACE
Definition(s)
NACE
National Association of Corrosion Engineers. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards Source: API RP 14F, Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class 1, Division 1 and Division 2 Locations, Fifth Edition, July 2008. Global Standards Source: API RP 49, Recommended Practice for Drilling and Well Servicing Operations Involving Hydrogen Sulfide, Third Edition, May 2001. Global Standards Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards Source: API SPEC 17D, Design and Operation of Subsea Production Systems—Subsea Wellhead and Tree Equipment, Upstream Segment, Second Edition May 2011 (Errata September 2011). Global Standards Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsNACE
NACE International (formerly National Association of Corrosion Engineers). Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC GuidelinesNACE
“NACE” means the National Association of Corrosion Engineers. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsNACE
NACE International.. Source: Deepwater Well Control Guidelines. IADC GuidelinesNACE Service
Definition(s)
NACE Service
Packers or bridge plugs whose type 1 components (3.41) are manufactured from materials that comply with ISO 15156 (all parts). Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsNaCL
Definition(s)
NaCL
Sodium Chloride.Source: Deepwater Well Control Guidelines. IADC Guidelines
NAF
Definition(s)
NAF
Non-aqueous fluid. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global StandardsNAFTA
Definition(s)
NAFTA
“NAFTA” has the same meaning as “Agreement” in the North American Free Trade Agreement Implementation Act; ALÉNA. Source: National Energy Board Act, R.S.C., 1985, c. N-7, Canada, current to April 29, 2013. LegislationNAI
Definition(s)
NAI
Normally Attended Installation. Source: NOGEPA Guideline 14, Helideck Operations and Procedures Manual, Netherlands, Version 2, December 2011. Global StandardsNamed Month
Definition(s)
Named month
Named month means one of the 12 months of the calendar year. Source: Offshore Petroleum and Greenhouse Gas Storage (Resource Management and Administration) Regulations 2011 (Select Legislative Instrument 2011 No. 54 as amended), Australia, prepared on 1 January 2012. RegulationsNASA
Definition(s)
NASA
U. S. National Aeronautics and Space Administration Source: ANSI/ISA–99.00.01–2007, Security for Industrial Automation and Control Systems, Part 1: Terminology, Concepts, and Models, 29 October 2007. National StandardNational Authority
Definition(s)
National Authority
National Authority is the Marine Authority in the country in which a unit is registered. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 1, Regulations, June 2013, Lloyd’s Register, Global StandardsNational Average Per Capita Fiscal Capacity
Definition(s)
National Average Per Capita Fiscal Capacity
“National average per capita fiscal capacity” means the per capita fiscal capacity of all of the provinces; moyenne nationale. Source: Canada-Nova Scotia Offshore Petroleum Resources Accord Implementation Act, S.C. 1988, c. 28, Canada, current to May 26, 2013. LegislationNational Building Code
Definition(s)
National Building Code
“National Building Code” means the National Building Code of Canada, 1985, issued by the Associate Committee on the National Building Code, National Research Council of Canada, dated 1985, as amended to January 1987 (Code national du bâtiment). Source: Canada Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, February 2013. Regulations Source: Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, Canada, current to April 29, 2013. RegulationsNational Building Code
“National Building Code” means the National Building Code of Canada, 1985, issued by the Associate Committee on the National Building Code, National Research Council of Canada, as amended from time to time. Source: Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. RegulationsNational Consensus Standard
Definition(s)
National Consensus Standard
"National Consensus Standard" means any standard or modification thereof which:- Has been adopted and promulgated by a nationally recognized standards-producing organization under procedures whereby it can by determined by the Secretary of Labor or by the Assistant Secretary of Labor that persons interested and affected by the scope or provisions of the standard have reached substantial agreement on its adoption;
- Was formulated in a manner which afforded an opportunity for diverse views to be considered;
- Has been designated as such a standard by the Secretary or the Assistant Secretary after consultation with other appropriate Federal Agencies.
National Fire Code
Definition(s)
National Fire Code
“National Fire Code” means the National Fire Code of Canada, 1985, issued by the Associate Committee on the National Fire Code, National Research Council of Canada, dated 1985, as amended to January 1987 (Code national de prévention des incendies). Source: Canada Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, February 2013. Regulations Source: Oil and Gas Occupational Safety and Health Regulations, SOR/87-612, Canada, current to April 29, 2013. RegulationsNational Fire Code
“National Fire Code” means the National Fire Code of Canada, 1985; issued by the Associate Committee on the National Fire Code, National Research Council of Canada, as amended from time to time. Source: Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. RegulationsNational NAVTEX Service
Definition(s)
National NAVTEX Service
National NAVTEX service means the broadcast and automatic reception of maritime safety information by means of narrow-band direct-printing telegraphy using frequencies other than 518 kHz and languages as decided by the Administration concerned Source: IMO resolution A.1051(27), IMO/WMO Worldwide Met-Ocean Information and Warning Service ‒ Guidance Document, 20 December 2011, International Maritime Organization. Regulatory GuidanceNational SafetyNET Service
Definition(s)
National SafetyNET Service
National SafetyNET service means the broadcasting and automated reception of maritime safety information via the Inmarsat EGC system, using languages as decided by the Administration concerned Source: IMO resolution A.1051(27), IMO/WMO Worldwide Met-Ocean Information and Warning Service ‒ Guidance Document, 20 December 2011, International Maritime Organization. Regulatory GuidanceNational Standard
Definition(s)
National standard
A standard approved by a national body of the Russian Federation for standardization. Source: Federal Law on Technical Regulation, No. 184-FZ, Russian Federation, December 2002 (amended September 2010). RegulationsNatural Gas
Definition(s)
Natural gas
Typical composition is (approximate percentages) 80% methane, 7% Ethane, 6% Propane, 2.5% Butane, 1.5% Isobutane, and 3% Pentane. Used in UB Drilling where it is available from local pipelines or other sources at reasonable cost. Has advantage of eliminating downhole corrosion and combustion problems, but surface handling presents safety issues during connections and tripping.
Natural gas
“Natural gas” means all kinds of gaseous hydrocarbons, whether wet or dry, produced from oil or gas wells; and also includes the residue gas remaining after the extraction of liquid hydrocarbons or by-products from wet gas. Source: Law of Information Energy, Petroleum Act B.E. 2514 (1971), Thailand, as of June 2013. LegislationNatural gas
A highly compressible, highly expandable mixture of hydrocarbons which occurs naturally in a gaseous form and passes a meter in vapor phase. Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). RegulationsNatural gas
A highly compressible, highly expandable mixture of hydrocarbons which occurs naturally in a gaseous form and passes a meter in vapor phase. Source: The Oil Industry (Development) Act, 1974, Act No. 47 of 1974, India, as amended as of May 2013. LegislationNatural Gas
“Natural gas” means gas obtained from bore-holes and consisting primarily of hydrocarbons. Source: The Petroleum and Natural Gas Rules, 1959 (As amended from time to time), India, as amended as of May 2013. RegulationsNatural Gas
“Natural gas” means gas obtained from bore- holes and consisting primarily of hydrocarbons and includes-- gas in liquid state, namely, liquefied natural gas and regasified liquefied natural gas,
- compressed natural gas,
- gas imported through transnational pipe lines, including CNG or liquefied natural gas,
- gas recovered from gas hydrates as natural gas, (v) methane obtained from coal seams, namely, coal bed methane, but does not include helium occurring in association with such hydrocarbons.
Natural Gas Liquid
Definition(s)
Natural gas liquid
“Natural gas liquid” means liquid or high vapor pressure hydrocarbons produced with or extracted from natural gas. Source: Law of Information Energy, Petroleum Act B.E. 2514 (1971), Thailand, as of June 2013. LegislationNatural Gas Liquids (NGL)
Definition(s)
Natural Gas Liquids (NGL)
Petroleum fluid primarily composed of ethane, propane, and butane NGL is a gas at atmospheric pressure but transported as a
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
liquid by maintaining it under high pressure.