Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
H2S
Definition(s)
H2S
Hydrogen sulfide. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. 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 STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global StandardsH2S
An abbreviation for hydrogen sulfide. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsH2S
Hydrogen Sulphide. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. 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 Guidelines Source: OGP Report No. 476, Recommendations for enhancements to well control training, examination and certification, International Association of Oil & Gas Producers, October 2012. Global StandardsH2S
Colorless, flammable, extremely hazardous gas with a “rotten egg” smell that occurs naturally in crude petroleum, natural gas, and hot springs and is produced by bacterial breakdown of organic materials and human and animal wastes (e.g. sewage). NOTE 1 Some common names for the gas include sewer gas, stink damp, swamp gas, and manure gas. NOTE 2 Industrial activities that can produce the gas include petroleum/natural gas drilling and refining, wastewater treatment, coke ovens, tanneries, and paper mills. Hydrogen sulfide can also exist as a liquid compressed gas. Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global StandardsH2S
“H2S” means hydrogen sulfide. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsH2S Absent
Definition(s)
H2S absent:
H2S absent means:- Drilling, logging, coring, testing, or producing operations have confirmed the absence of H2S in concentrations that could potentially result in atmospheric concentrations of 20 ppm or more of H2S; or
- Drilling in the surrounding areas and correlation of geological and seismic data with equivalent stratigraphic units have confirmed an absence of H2S throughout the area to be drilled.
H2S Present
Definition(s)
H2S present:
H2S present means drilling, logging, coring, testing, or producing operations have confirmed the presence of H2S in concentrations and volumes that could potentially result in atmospheric concentrations of 20 ppm or more of H2S. H2S present means that drilling, logging, coring, testing, or producing operations have confirmed the presence of H2S in concentrations and volumes that could potentially result in atmospheric concentrations of 20 ppm or more of H2S. Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). RegulationsH2S Trim
Definition(s)
H2S Trim
All components, except external valve body, meeting the H2S service requirements of ISO 15156-2 and ISO 15156-3. NOTE For the purposes of this provision, NACE MR0175 is equivalent to ISO 15156–2 and ISO 15156–3. Source: API SPEC 7-1, Specification for Rotary Drill Stem Elements, First Edition, March 2006 (Addendum April 2011). Global StandardsH2S Unknown
Definition(s)
H2S unknown:
H2S unknown means the designation of a zone or geologic formation where neither the presence nor absence of H2S has been confirmed. Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). RegulationsHacking
Definition(s)
Hacking
Intentionally accessing a computer system without the authorization of the user or the owner. Source: ISO/IEC 27032:2015, Information technology — Security techniques — Guidelines for cybersecurity, First Edition, July 2012. Global StandardsHactivism
Definition(s)
Hactivism
Hacking for a politically or socially motivated purpose. Source: ISO/IEC 27032:2015, Information technology — Security techniques — Guidelines for cybersecurity, First Edition, July 2012. Global StandardsHalocarbon Agent
Definition(s)
Halocarbon Agent
Halocarbon agent is a fire-extinguishing medium consisting of one or more carbon atoms linked to one or more Halogen atoms from the elements bromine, chlorine, fluorine and iodine. Source: IMO MSC.1/Circ.1316, Guidelines on determining the no observed adverse effect level (NOAEL) and lowest observed adverse effect level (LOAEL) values for halocarbon fire-extinguishing agents, 10 June 2009, International Maritime Organization. Regulatory GuidanceHand Lay-up
Definition(s)
Hand Lay-up
Process for fabricating a composite structure in which discontinuous reinforcements, e.g. woven mats, chopped strand mats, are impregnated with a matrix material and are manually applied on a mandrel or mold. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsHand-Tight
Definition(s)
Hand-Tight
Threaded joint that has been made-up by hand without the aid of tongs. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsHand-Tight Standoff
Definition(s)
Hand-Tight Standoff
Length, at hand-tight engagement from the face of the coupling to the vanish point of the threads for round threads and the base of the triangle for buttress threads. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsHandling
Definition(s)
Handling
Handling also means handling during hazard and accident situations. Source: Guidelines Regarding the Activities Regulations, Norway, updated December 2012. Regulatory Guidance Source: Guidelines Regarding the Technical and Operational Regulations, Norway, updated December 2012. Regulatory GuidanceHandling Damage
Definition(s)
Handling Damage
Damage to the OCTG body, coupling or threads that occurred during loading, unloading, movements in transit, etc. EXAMPLES cuts, gouges, dents, flattened (mashed) thread crests or similar. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsHandling Tight
Definition(s)
Handling Tight
Sufficiently tight so that the coupling cannot be removed except by use of a wrench. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global StandardsHandling Tool
Definition(s)
Handling Tool (Running Tool)
A device that joins to the upper end of a riser joint to permit lifting and lowering of the joint and the assembled riser string in the derrick by the elevators. Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global StandardsHandover
Definition(s)
Handover
Handover of wells between units means handover between production, well service, operation, maintenance, etc. Source: Guidelines Regarding the Activities Regulations, Norway, updated December 2012. Regulatory GuidanceHands on Proficiency
Definition(s)
Hands on Proficiency
“Hands On” proficiency is defined as a physical means of verifying the following: 1. Crane Operator’s dexterity and coordination. 2. Crane Operator’s familiarity with overall machine functions and characteristics. Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Sixth Edition, May 2007. Global StandardsHang-off
Definition(s)
Hang-Off
An action whereby the weight of that portion of the drill string below a ram BOP is supported by a tool joint resting on the closed pipe ram or through the use of a special hang-off tool that lands in the wellhead. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global StandardsHang-Off
Riser when disconnected from seabed. NOTE Hang-off is usually differentiated from disconnected. Disconnected is normally the condition directly after disconnecting the riser. Hang-off is normally associated with the riser suspended from the rotary table. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsHanger Mandrel
Definition(s)
Hanger Mandrel
Portion of a casing or tubing hanger that is attached by a threaded connection to the tubular string and forms the upper end of that tubular string. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global StandardsHard Close-In
Definition(s)
Hard Close-In
To Close-in a well by closing a BOP with the choke and/or choke line valve closed. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsHard Hang-Off
Definition(s)
Hard Hang-Off (Riser Hang-Off)
The riser is effectively locked to the vessel and moves with it. Hard hang-off is applicable to either the deployment/retrieval configuration or the storm configuration. Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global StandardsHard Shut In
Definition(s)
Hard Shut In
To close in a well with the bop having the choke or choke line valve closed. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsHard-Banding
Definition(s)
Hard-Banding (or Hard-Facing)
Sacrificial or wear-resistant material applied to component’s surface to prevent wear of the component. Source: API RP 7G-2, Recommended Practice for Inspection and Classification of Used Drill Stem Elements, First Edition, August 2009. Global StandardsHard-Banding (or Hard-Facing)
Application of material onto tool joints to reduce external wear of the tool joint. NOTE Also known as hard facing. Source: API SPEC 5DP, Specification for Drill Pipe, First Edition, August 2009. Global StandardsHardener
Definition(s)
Hardener
Substance or mixture added to a plastic composition to promote or control the curing action by taking part in it.- Note: 1 to entry: For epoxies, hardener is also called curing agent (3.2.13).
Hardness
Definition(s)
Hardness
Material surface property as determined from a test such as Rockwell, Brinell, Vickers, etc.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards