S

Definition(s)

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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 Standards  

Stress 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 Standards  

Stress Corrosion Cracking

Cracking induced by a combination of stress and corrosion. Source: IADC UBO / MPD Glossary, December 2011. Global Standards  

Stress 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 Standards

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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 Standards

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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 Standards  

Subsurface 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 Standards

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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 Standards

Special 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 Standards

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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 Standards

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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 Standards  

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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 Standards  

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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 Standards  

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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

Shear Device

Component designed to disconnect under a predetermined load. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global Standards

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Stop Collar

Device attached to the casing to prevent movement of a casing centralizer. NOTE A stop collar can be either an independent piece of equipment or integral with the centralizer. Source: API SPEC 10D, Specification for Bow-String Casing Centralizers Upstream Segment, Sixth Edition, March 2002 (Reaffirmed August 2010). Global Standards

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Starting Force

Maximum force required to insert a centralizer into a specified wellbore diameter. NOTE Starting-force values can vary depending on the installation methods. Source: API SPEC 10D, Specification for Bow-String Casing Centralizers Upstream Segment, Sixth Edition, March 2002 (Reaffirmed August 2010). Global Standards

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Standoff Ratio

Ratio of standoff to annular clearance. NOTE It is expressed as a percentage. Source: API SPEC 10D, Specification for Bow-String Casing Centralizers Upstream Segment, Sixth Edition, March 2002 (Reaffirmed August 2010). Global Standards

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Standoff

Smallest distance between the outside diameter of the casing and the wellbore. Source: API SPEC 10D, Specification for Bow-String Casing Centralizers Upstream Segment, Sixth Edition, March 2002 (Reaffirmed August 2010). Global Standards

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Slurry Container or Slurry Cup

Container in an atmospheric or pressurized consistometer used to hold the slurry for conditioning purposes or for the thickening-time test. Source: API SPEC 10A, Specification for Cements and Materials for Well Cementing, Twenty-fourth Edition, December 2010. Global Standards

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Static Load

Operation that can change or affect the mechanical properties, including toughness, of the materials used in equipment. Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards  

Static Load

The load exerted on the BOP handling system by the static weight of the BOP stack.

Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards

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Snub-Line

Wire rope, one end of which is fastened to the end of a pipe tong handle attachment point and the other end secured to hold the tong stationary while the tong is in use. NOTE: Snub-lines do not work over a sheave or bend. Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards  

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Size Range

Range of tubular diameters to which an assembly is applicable. Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards  

Size Range

Range of tubular diameters covered by an assembly. Source: API SPEC 8C, Drilling and Production Hoisting Equipment (PSL 1 and PSL 2), Fifth Edition, April 2012. Global Standards

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Size Class

Designation of the dimensional interchangeability of equipment specified herein. Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards  

Size Class

Designation by which dimensionally-interchangeable equipment of the same maximum load rating is identified. Source: API SPEC 8C, Drilling and Production Hoisting Equipment (PSL 1 and PSL 2), Fifth Edition, April 2012. Global Standards

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Stress-Relief Features

Modification performed on rotary shouldered connections by removing the unengaged threads on the pin or box to make the joint more flexible and to reduce the likelihood of fatigue-cracking in highly stressed areas. Source: API SPEC 7-1, Specification for Rotary Drill Stem Elements, First Edition, March 2006 (Addendum April 2011). Global Standards  

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SSV

Surface Safety Valve. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: IADC UBO / MPD Glossary, December 2011. Global Standards

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Swab Valve or Crown Valve

Uppermost valve on the vertical bore of the christmas tree above the flowline outlet. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

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Surface Safety Valve or SSV

Automatic wellhead valve assembly that closes upon loss of power supply. NOTE Where used in this International Standard, the term is understood to include an SSV valve and SSV actuator. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

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Substantive Change

Change that potentially affects the performance or rating of the tool in the intended service as evaluated by a qualified person at the supplier/manufacturer.

Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards

Substantive Change

Change identified by the manufacturer that affects the performance of the product in the intended service. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

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Studded Connection

Flanged end or outlet connection in which thread-anchored studs screwed into tapped holes replace the holes for bolt studs. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Studded Connection

Connection in which thread-anchored studs are screwed into tapped holes. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards

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Stress-Corrosion Cracking

Cracking that results from a combination of corrosion and stress. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

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Stress Relief

Controlled heating of material to a predetermined temperature for the purpose of reducing any residual stresses after welding. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards  

Stress Relief

Controlled heating of material to a predetermined temperature for the purpose of reducing any residual stresses. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards Source: API SPEC 14A, Specification for Subsurface Safety Valve Equipment, Eleventh Edition, October 2005 (Reaffirmed June 2012). Global Standards Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global Standards

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Stainless Steel

Steel containing more than 11 % mass fraction chromium to render the steel corrosion resistant. NOTE Other elements may be added to secure special properties. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Stainless Steel

Steel containing chromium, more than 11%, to render the steel corrosion resistant. Other elements may be added to secure special properties. Source: API SPEC 16C, Specification for Choke and Kill Systems, First Edition, January 1993 (Reaffirmed 2001). Global Standards

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SSV Actuator or Underwater Safety Valve Actuator or USV Actuator

Device which causes the SSV/USV valve to open when power is supplied and to close automatically when power is lost or released. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

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Slip-Type Casing Hanger

Mechanism used to support a casing string in a casing head by gripping the pipe with wedge-type members. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards