Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Stress Corrosion Cracking (SCC)
Definition(s)
Stress Corrosion Cracking (SCC)
Cracking of metal involving anodic processes of localized corrosion and tensile stress (residual and/or applied) in the presence of water and H2S. NOTE Chlorides and/or oxidants and elevated temperature can increase the susceptibility of metals to this mechanism of attack. [ISO 15156-1]. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsStress Corrosion Cracking
The cracking which results from a combination of corrosion and stress. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global StandardsStress Corrosion Cracking
Cracking induced by a combination of stress and corrosion. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsStress Corrosion Cracking
Cracking of metal involving anodic processes of localized corrosion and tensile stress (residual and/or applied). NOTE 1 Parameters that influence the susceptibility to SCC are temperature, pH, chlorides, dissolved oxygen, H2S and CO2. NOTE 2 The above definition differs from that of the same term given in ISO 15156-1:2009, definition 3.21, since it includes external environments. Source: ISO 21457:2010, Petroleum and natural gas industries — Materials selection and corrosion control for oil and gas production systems, First Edition,September 2010. Global StandardsSubsurface Safety Valve Equipment or SSSV Equipment
Definition(s)
Subsurface Safety Valve Equipment or SSSV Equipment
Subsurface safety valve, and all components that establish tolerances and/or clearances which can affect its performance or interchangeability. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsSubsurface Safety Valve (SSSV)
Definition(s)
Subsurface Safety Valve (SSSV)
Device whose design function is to prevent uncontrolled well flow when closed. NOTE SSSVs can be installed and retrieved by wireline or pump-down methods (wireline retrievable) or be an integral part of the tubing string (tubing-retrievable). Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsSubsurface Safety Valve (SSSV)
device installed in a well below the wellhead with the design function to prevent uncontrolled well flow when actuated Note 1 to entry: These devices can be installed and retrieved by wireline (Wireline retrievable) and/or pump down methods (TFL-Thru Flow Line) or be integral part of the tubing string (Tubing retrievable). Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global StandardsSpecial Feature
Definition(s)
Special Feature
Specific additional functional capability not specifically described in the validation profile test sequences in Annex A.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsSpecial Feature
Specific component or sub-assembly that provides a functional capability that is not validated during the validation test conducted in accordance with 6.5. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsSize
Definition(s)
Size
Relevant dimensional characteristics of the equipment as defined by the manufacturer. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsSealing Device
Definition(s)
Sealing Device
Device preventing contact of liquid and/or gas across the interface between the lock mandrel and the landing nipple. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsMass Loss Corrosion
Definition(s)
Mass Loss Corrosion
weight loss corrosion (deprecated term) loss of metal in areas exposed to fluids which contain water or brine and carbon dioxide (CO2), oxygen (O2) or other corrosive agents NOTE The term “weight” is commonly incorrectly used to mean mass, but this practice is deprecated. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsInterchangeable
Definition(s)
Interchangeable
Specified, timed sequence of controlled heating and cooling of materials for the purpose of changing physical or mechanical properties. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsFunctional Test
Definition(s)
Functional Test
Test process performed to confirm proper operation of a tool.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsFunctional Test
Test performed to confirm proper operation of equipment. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsBean Or Orifice
Definition(s)
Bean Or Orifice
Designed restriction causing the pressure drop in velocity-type SSCSVs. Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global StandardsNBS
Definition(s)
NBS
National Bureau of Standards. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsOCMA
Definition(s)
OCMA
Oil Companies' Materials Association. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsCMC-LVT
Definition(s)
CMC-LVT
Carboxymethylcellulose — Low-viscosity, technical-grade. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsCMC-HVT
Definition(s)
CMC-HVT
Carboxymethylcellulose — High-viscosity, technical-grade. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsEDTA
Definition(s)
EDTA
Ethylenediaminetetraacetic acid. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsAPME
Definition(s)
APME
Association of Plastic Manufacturers in Europe. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsACS
Definition(s)
ACS
American Chemical Society. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsACS
Anti-collision (zone management) system. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsFlash Side
Definition(s)
Flash Side
Side containing residue (“flash”) from stamping, or the side with concave indentation. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global StandardsMTR
Definition(s)
MTR
Material test report. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsMTR
Material test report (mill test report). Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global StandardsCOC
Definition(s)
COC
Document in which the manufacturer certifies that the assembly or part is in conformance to the mentioned standard(s), specifications, and guidelines in accordance with the original product definition. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsCOC
Certificate of Conformance. Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsCOC
Certificate of compliance (or conformance). Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsCOC
Certificate of compliance. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsCOC
Certificate of competency. Source: IMO Resolution A.1079(28), Recommendations for the Training and Certification of Personnel on Mobile Offshore Units (MOUs), Adopted on 4 December 2013, International Maritime Organization, Regulatory GuidanceType 2 Component 〈Weld〉
Definition(s)
Type 2 Component 〈Weld〉
Component that does not meet the criteria of a type 1 component (3.41). Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsType 1 Component 〈Weld〉
Definition(s)
Type 1 Component 〈Weld〉
Component that isolates pressure and/or may be loaded in tension as the result of axial loads on the packer or bridge plug during run-in, setting, in situ, or retrieval. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsTemperature Range
Definition(s)
Temperature Range
Specified range of temperature over which the product is designed to operate. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsTemperature-Cycle Range
Definition(s)
Temperature-Cycle Range
Specified range of temperature fluctuation over which the product is designed to operate. NOTE The temperature-cycle range is applicable anywhere within the product’s temperature range. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsSubstantive Design Change
Definition(s)
Substantive Design Change
Change to the design, identified by the supplier/manufacturer, that affects the performance of the product in the intended service condition. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global StandardsStandard Service
Definition(s)
Standard Service
Packer (3.26) or bridge plug (3.2) whose components might or might not be 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 StandardsShear Device
Definition(s)
Shear Device
Component designed to part under a predetermined load.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards