Soft Close-In

Soft Close-In

Definition(s)


Soft Close-In

To Close-in a well by closing a BOP with the choke and choke line valve open, then closing the choke while monitoring the casing pressure gauge for maximum allowable casing pressure. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards
Shear Rams

Shear Rams

Definition(s)


Shear Rams

BOP rams with a built-in cutting edge that will shear tubulars that may be in the hole. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards
Saltwater Flow

Saltwater Flow

Definition(s)


Saltwater Flow

An influx of formation saltwater into the well bore. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards
Safety Factor

Safety Factor

Definition(s)


Safety Factor

In the context of this publication, an incremental increase in drilling fluid density beyond the drilling fluid density indicated by calculations to be needed to contain a kicking formation. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  

Safety Factor

"Safety Factor" means the ratio of the ultimate breaking strength of a member or piece of material or equipment to the actual working stress. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. Regulations  
Safety Case

Safety Case

Definition(s)


Safety case

Safety case means the document known as a safety case that is submitted to NOPSEMA under Part 2 of Chapter 2. Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. Regulations  

Safety cases

For S.I. 1996/913, in regulation 2(1) (interpretation) in the definition of “safety cases” for the words “1992” substitute “2005”. Source: The Offshore Installations (Safety Case) Regulations 2005, UK S.I. 2005/3117, 2005. Regulations  

Safety cases

Explanatory Note: A safety case is defined in the Regulations as a document containing specified information relating to the management of health and safety and the control of major accident hazards and containing the particulars specified in the Schedule referred to in the provision of the Regulations under which it is prepared (regulations 2(2) and 12). Source: The Offshore Installations (Safety Case) Regulations 2005, UK S.I. 2005/3117, 2005. Regulations  
Start-up Notice

Start-up Notice

Definition(s)


Start-up notice

Start-up notice, for a diving project, means a written notice, signed by or for the person giving it, dated and containing the following information:
  1. the name, address and telephone number of the diving contractor for the project;
  2. the name, address and telephone number of a person who can be contacted by NOPSEMA at any time during the project;
  3. the date when diving is expected to begin;
  4. the expected duration of the project;
  5. the location of the project;
  6. the depth to which divers will dive;
  7. the purpose of the diving project;
  8. the estimated number of people to be engaged in the project;
  9. the breathing mixture to be used;
  10. the title, document number and revision number of the diving project plan for the project.
Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. Regulations  
Substantive Criminal Law

Substantive Criminal Law

Definition(s)


Substantive criminal law

Substantive criminal law has the meaning given in subclause 1 (1) of Schedule 1 to the Crimes at Sea Act 2000. Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. Regulations  
Safety Authority

Safety Authority

Definition(s)


Safety Authority

Safety Authority has the same meaning as it had in section 7 of the Act before the commencement of Part 1 of Schedule 2 to the Offshore Petroleum and Greenhouse Gas Storage Amendment (National Regulator) Act 2011. Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. Regulations  
Safety Case in Force

Safety Case in Force

Definition(s)


Safety case in force

For the definition of safety case in force in relation to a facility in subsection 7 (8) of the Offshore Petroleum and Greenhouse Gas Storage (Safety Levies) Act 2003, a safety case in force in relation to a facility is a safety case that is in force. Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. Regulations  
Stage in Life

Stage in Life

Definition(s)


Stage in life

Stage in the life of the facility means any of the following:
  1. construction of the facility;
  2. installation of the facility;
  3. operation of the facility;
  4. modification of the facility;
  5. decommissioning of the facility.
Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. Regulations  
Survey Interpretation Report

Survey Interpretation Report

Definition(s)


Survey interpretation report

Survey interpretation report means a report that includes the following information:
  1. the name of the survey;
  2. the title under which the survey was conducted;
  3. the name of the titleholder;
  4. a description of the objectives of the interpretation;
  5. for a seismic survey:
    1. a list of the surfaces interpreted; and
    2. a justification of the surfaces interpreted, including synthetic seismograms if available; and
    3. the velocity field used to convert time to depth (including ASCII data) and the basis for the velocity field; and
    4. if available, time slices to describe the environment of deposition;
  6. a bathymetric map of the survey area;
  7. an index of the maps created during the interpretation.
 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. Regulations  
Survey Processing Report

Survey Processing Report

Definition(s)


Survey processing report

Survey processing report means a report that includes:
  1. the name of the survey; and
  2. the title under which the survey was conducted; and
  3. the name of the titleholder; and
  4. the dates on which processing of the survey started and ended; and
  5. the name of the processing contractor; and
  6. the purpose of the processing; and
  7. a summary of the data acquisition parameters; and
  8. details of all the processing sequences and techniques used; and
  9. a sample Extended Binary Coded Decimal Interchange Code (EBCDIC) header from the final data set; and
  10. listings of all processed data; and
  11. for a 3-dimensional survey:
    1. a description of the position of the survey polygon; and
    2. a calculation for the 3-dimensional line numbering convention.
 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. Regulations  
Survey Acquisition Report

Survey Acquisition Report

Definition(s)


Survey acquisition report

Survey acquisition report means a report that includes:
  1. the name of the survey; and
  2. the title under which the survey was conducted; and
  3. the name of the titleholder; and
  4. the name of the contractor that conducted the survey; and
  5. the name of the vessel or aircraft that conducted the survey; and
  6. a map of where the survey was conducted; and
  7. the dates on which the survey started and ended; and
  8. details of all data acquisition equipment and systems used; and
  9. details of all positioning and navigation equipment and systems used; and
  10. the number of lines of data acquired in the survey and the number of data acquisition points along each line; and
  11. navigation data for the survey, in the form of:
    1. for a 2-dimensional survey — line ends and bends; or
    2. for a 3-dimensional seismic survey — a full fold polygon outline; or
    3. for other 3-dimensional surveys — a polygon outline; and
  12. the geometry of the acquisition parameters; and
  13. the results of any onboard data processing; and
  14. the results of any system tests, calibrations and diagnostics.
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. Regulations  
Survey Acquisition Data

Survey Acquisition Data

Definition(s)


Survey acquisition data

Survey acquisition data means:
  1. for a seismic survey — each type of data mentioned in an item in Part 1 of Schedule 3:
    1. presented on a medium and in a format specified in the item; or
    2. presented on another medium or in another format that the Titles Administrator has authorised the petroleum titleholder to use; or
  2. for any other type of survey — each type of data mentioned in an item in Part 2 of Schedule 3 and presented in accordance with subparagraph (a) (i) or (ii).
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. Regulations  

Survey acquisition data

Survey acquisition data means:
  1. for a seismic survey — each type of data mentioned in an item in Part 1 of Schedule 3:
    1. presented on a medium and in a format specified in the item; or
    2. presented on another medium or in another format that the Titles Administrator has authorised the greenhouse gas titleholder to use; or
  2. for any other type of survey — each type of data mentioned in an item in Part 2 of Schedule 3 and presented in accordance with subparagraph (a) (i) or (ii).
 
Significant Event

Significant Event

Definition(s)


Significant event

Significant event includes the following:
  1. a change in the understanding of the characteristics of the geology or reservoir that may have a significant impact on the optimum recovery of petroleum;
  2. a new or increased risk to the recovery of petroleum within the licence area;
  3. a new or increased risk to the recovery of petroleum outside the licence area caused by the development of pools in the licence area;
  4. a new or increased risk of activities in the licence area causing effects outside the licence area (for example aquifer depletion caused by hydrocarbon extraction);
  5. change to the proposed option for development of pools in the licence area, including any tie-in opportunity with nearby licence areas.
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. Regulations  
System Test Pressure

System Test Pressure

Definition(s)


System Test Pressure

Test pressure applied to the riser during system field pressure test of the C/WO riser system performed after installation and before start of operation. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
System Pressure Test

System Pressure Test

Definition(s)


System Pressure Test

Field hydrostatic leak-tightness pressure test of the complete riser system performed after installation and before start of operation. 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
Surge Pressure

Surge Pressure

Definition(s)


Surge Pressure

Pressure produced by sudden changes in the velocity of the moving stream of fluids inside the riser. 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  

Pressure Control

Rapid change in line or vessel pressure. Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Support Shoulder

Support Shoulder

Definition(s)


Support Shoulder

Shoulder or projection on the external surface of a connector or the riser component for supporting the riser system or well control equipment during riser running operations. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Surface Tree Adapter Joint

Surface Tree Adapter Joint

Definition(s)


Surface Tree Adapter Joint

Crossover from the standard riser joint connector to the connection at the bottom of the surface tree. NOTE Its bore configuration is consistent with the standard riser joint. This speciality joint is usually made up to the surface tree prior to installation. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Surface Tree

Surface Tree

Definition(s)


Surface Tree

Device placed at top of the riser string that provides flow control of the production and/or annulus bores during production. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Surface Tree

Device which provides flow control of the production and/or annulus bores during both tubing hanger installation and subsea tree installation/workover operations. NOTE It can also have provisions to support the mass of the C/WO riser system. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Subsea Test Tree

Subsea Test Tree

Definition(s)


Subsea Test Tree

Assembly of valves positioned above the tubing hanger running tool located inside the subsea BOP and equivalent to the lower workover riser package. NOTE It is used to secure the well and provides a disconnect point for the C/WO riser. The subsea test tree can be configured for operation on horizontal or vertical trees. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Stroke

Stroke

Definition(s)


Stroke.

One current component of a lightning flash. The number of strokes per flash is typically three to four, but may be as low as one or as high as 30 (Uman, All About Lightning, p. 41). Source: API RP 545 Recommended Practice for Lightning Protection of Aboveground Storage Tanks for Flammable or Combustible Liquids, First Edition, October 2009. Global Standards

Stroke

Total vertical movements (upward and downward) of the riser relative to the vessel which is also the travel of the riser tensioner.
  • NOTE: Stroke is affected by environmental loads, functional loads (i.e. top tension, temperature and mean static vessel offset) and pressure.
Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Stroke

Total upward and downward vertical movements of the riser relative to the vessel, i.e. travel of the riser tensioner, draw works and slick joint.
  • NOTE: It includes effects from environmental loads, functional loads (i.e. top tension, temperature and mean static vessel offset) and pressure.
Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Stress Range

Stress Range

Definition(s)


Stress Range

The difference between stress maximum and stress minimum in a stress cycle. 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
Stress Joint

Stress Joint

Definition(s)


Stress Joint

Specialized riser joint designed with a tapered cross-section to control curvature and reduce local bending stresses. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Stress Joint

Specialized riser joint designed with a tapered cross-section, in order to control curvature and reduce local bending stresses. NOTE It is the lowermost riser joint in the riser string when configured for workover. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Stress Intensity Factor

Stress Intensity Factor

Definition(s)


Stress Intensity Factor

Term used in fracture mechanics to define the local conditions of stress and strain around a crack tip, in terms of global parameters such as of loads, geometry and crack size. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Stress Intensity Factor (Fracture Mechanics)

Factor used to define the local conditions of stress and strain around a crack tip in terms of global parameters such as of loads, geometry and crack size. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Stress Concentration Factor

Stress Concentration Factor

Definition(s)


Stress Concentration Factor

Equal to the local peak stress in a component (including welds) divided by the nominal stress in the component cross-section at the location of the local peak stress.

Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards

Stress Concentration Factor (SCF)

Local peak alternating stress in a component (including welds) divided by the nominal alternating stress in the pipe wall at the location of the component.
  • NOTE: This factor is used to account for the increase in the stresses caused by geometric stress amplifiers that occur in the riser component.
Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards

Stress Concentration Factor (SCF)

Local peak alternating stress in a component (including welds) divided by the nominal alternating stress in the pipe wall at the location of the component.
  • NOTE: This factor is used to account for the increase in the stresses caused by geometric stress amplifiers, which occur in the riser component.
Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Stress Concentration Factor

Factor relating a nominal stress to the local stress at a detail. NOTE Adapted from ISO 19902:2007, definition 3.50. Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards
Strength

Strength

Definition(s)


Strength

Mechanical property of a material, usually given in units of stress. 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
Stab Sub

Stab Sub

Definition(s)


Stab Sub

Male half of sealing mechanism between component interfaces. NOTE Stab subs can use elastomeric or metal seals or both. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  
Splash Zone

Splash Zone

Definition(s)


Splash Zone

The area of the structure that is intermittently wet and dry due to wave and tidal action. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards

Splash Zone

Part of the riser subjected to repeated wetting and drying by seawater. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Splash Zone

part of a structure that is intermittently exposed to air and immersed in the sea Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards  

Splash Zone

The external surfaces of the unit that are periodically in and out of the water. The determination of the splash zone includes evaluation of all relevant effects including influence of waves, tidal variations, settlements, subsidence and vertical motions, see Sec.10 B200. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  

Splash Zone

That part of the external structure above the boot topping zone subject to wet and dry conditions. Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 8, Corrosion Controls, June 2013, Lloyd’s Register, Global Standards