Stress Amplification Factor

Stress Amplification Factor

Definition(s)

Stress amplification factor

Equal to the 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.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Stress amplification factor

The ratio of the localized stress to the stress in adjacent material. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

Stress amplification factor

Equal to the local peak alternating stress in a component (including welds) divided by the nominal alternating stress in a defined reference section somewhere in the system (e.g. through wall section of the wellhead above or below the locking profile).
  • NOTE: This factor is used to account for the increase in the stresses caused by geometric stress amplifiers which occur in connector components.
Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards  

Stress amplification factor (SAF)

Equal to the 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. This factor is used to account for the increase in the stresses caused by geometric stress amplifiers which occur in riser components. 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  

Stress Amplification Factor

Value equal to the 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 riser components.
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 Standards
Production Tieback

Production Tieback

Definition(s)

Production tieback

Production casing run from top of the production liner to the subsea wellhead housing NOTE The production liner tieback should have sufficient internal diameter to accommodate the surface controlled subsurface safety valve (SCSSV) and any control or chemical injection lines required for the completion. Normal clearance casing OD in.: N/A. Tight clearance casing OD in.: 10 3/4 × 9 7/8. NOTE These are examples only. Each well can have variations in number of casing strings and sizes. Naming conventions can vary. The heavy-wall surface casing designs may allow 13 5/8 in. to be run as a liner and not tied back. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
Intermediate Liner

Intermediate Liner

Definition(s)

Intermediate liner

Liner hung below intermediate casing/liner. Normal clearance casing OD in.: N/A. Tight clearance casing OD in.: 13 5/8 or 11 7/8. NOTE These are examples only. Each well can have variations in number of casing strings and sizes. Naming conventions can vary. The heavy-wall surface casing designs may allow 13 5/8 in. to be run as a liner and not tied back. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
Drilling Tieback

Drilling Tieback

Definition(s)

Drilling tieback

Casing run from top of liner to the subsea wellhead housing (i.e. for increased pressure capacity and/or casing wear considerations). Normal clearance casing OD in.: N/A. Tight clearance casing OD in.: 13 5/8 optional. NOTE These are examples only. Each well can have variations in number of casing strings and sizes. Naming conventions can vary. The heavy-wall surface casing designs may allow 13 5/8 in. to be run as a liner and not tied back. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
Shallow Intermediate Liner

Shallow Intermediate Liner

Definition(s)

Shallow intermediate liner

Large diameter casing normally run as a liner and hung in a profile in the surface casing (18 in. can be called “surface extension” by regulators). Normal clearance casing OD in.: N/A. Tight clearance casing OD in.: 18 and/or 16. NOTE These are examples only. Each well can have variations in number of casing strings and sizes. Naming conventions can vary. The heavy-wall surface casing designs may allow 13 5/8 in. to be run as a liner and not tied back. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
WOC

WOC

Definition(s)

WOC

Waiting on cement. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

WOC

Waiting on cement. Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global Standards  
VIT

VIT

Definition(s)

VIT

Vacuum insulated tubing. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
TOC

TOC

Definition(s)

TOC

Top of cement. 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 RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
TD

TD

Definition(s)

TD

Total depth. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

TD

To deliver. Source: API SPEC 13A, Specification for Drilling Fluids Materials, Eighteenth Edition, February 2010. Global Standards
SWF

SWF

Definition(s)

SWF

Shallow water flow. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global Standards Source: Deepwater Well Control Guidelines. IADC Guidelines
SWA

SWA

Definition(s)

SWA

Stop work authority. Source: API  Bulletin 97, Well Construction Interface Document Guidelines, First Edition, December 2013. Global Standards Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
SSTT

SSTT

Definition(s)

SSTT

Subsea test tree. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
SRB

SRB

Definition(s)

SRB

Sulfate reducing bacteria. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

SRB

Sulphate reducing bacteria. Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  
QC

QC

Definition(s)

QC

Quality Control. Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards Source: API Technical Report 17TR7, Verification and Validation of Subsea Connectors, First Edition, April 2017. Global Standards 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 RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global Standards Source: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards  

QC

Those physical activities that are conducted to check conformance with specifications in accordance with the QA plan.

Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards  

qc

Cone resistance.

Source: ABS Guidance Notes on Geotechnical Performance of Spudcan Foundations, January 2017. Global Standards
QA

QA

Definition(s)

QA

Quality Assurance. Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards 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 RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards Source: NOPSEMA Guidance Note: Safety Management Systems, N04300-GN1052, Australia, Revision 0, December 2012. Regulatory Guidance Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. 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: ISO 19900:2013, Petroleum and natural gas industries – General requirements for offshore structures. Global Standards  

QA

All planned, systematic, and preventative actions specified to determine if materials, equipment, or services will meet specified requirements so that equipment will perform satisfactorily in service. The minimum contents of a QA inspection manual for in-service inspection are outlined in 4.1.2.

Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards
MYS

MYS

Definition(s)

MYS

Minimum yield stress. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
LTP

LTP

Definition(s)

LTP

Liner top packer. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
LPWH

LPWH

Definition(s)

LPWH

Low pressure wellhead housing. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
ITC

ITC

Definition(s)

ITC

Internal tree cap. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
HTH

HTH

Definition(s)

HTH

Horizontal tubing hanger. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
HPWHH

HPWHH

Definition(s)

HPWHH

High pressure wellhead housing. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards
C&K

C&K

Definition(s)

C&K

Choke and kill. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards Source: Deepwater Well Control Guidelines. IADC Guidelines
Well Test

Well Test

Definition(s)

Well Test

Flowing reservoir fluids to the surface to evaluate the reservoir and the completion. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

Well Testing

Well testing as mentioned in the third subsection, means flow during formation testing, test production, cleanup and stimulation of the well. Source: Guidelines Regarding the Facilities Regulations, Norway, updated December 2012. Regulatory Guidance  
Watch circle

Watch circle

Definition(s)

Watch circle

Area of predetermined size in which the drilling rig maintains its intended position (station) in order to not exceed equipment or reaction time limitations. NOTE If the rig moves to the edge of the watch circle, then attention is heightened. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

Watch circle

The rig offset perimeter around the well location for which special procedures are to be initiated to prepare to disconnect the drilling riser or actually implement the disconnect to prevent damage due to excessive offset. Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global Standards  
Verification

Verification

Definition(s)

Verification

Confirmation that specified design requirements have been fulfilled, through the provision of objective evidence.
  • NOTE: Typically verification is achieved by calculations, design reviews, hydrostatic testing, and factory acceptance testing (FAT).
Source: API Recommended Practice 17H, Remotely Operated Tools and Interfaces on Subsea Production Systems, Second Edition, June 2013 (Addendum 1, October 2014). Global Standards

Verification

Examination, testing, audit or review to confirm that an activity, product or service is in accordance with specified requirements. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards

Verify/verification

A quality control process used to evaluate whether or not a product, service, or system complies with a given criteria set (i.e. regulations, specifications, or conditions). NOTE Verification can be in development or production phases (often an internal process). Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  

Verification

Examination to confirm that an activity, a product or a service is in accordance with specified requirements. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Verification

A word used in UK offshore OHS legislation, but not Australian, to describe a process related to validation but significantly broader. Source: NOPSEMA Guideline – Glossary – Regulatory Operations, N-09000-GL0326, Australia, Revision 5, December 2011. Regulatory Guidance  

Verification

Confirmation, through the provision of objective evidence, that specified requirements have been fulfilled. [SOURCE: ISO 9000:2005]
  • Note 1 to entry: This could also be called compliance testing.
Source: ISO/IEC 27000:2014, Information technology — Security techniques — Information security management systems — Overview and vocabulary, Third Edition, January 2014. Global Standards  

Verification

Examination made to confirm that an activity, product, or service is in accordance with specified requirements. Source: ISO 19901-7:2013, Petroleum and natural gas industries – Specific requirements for offshore structures – Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units. Global Standards Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global Standards  

Verification

A service that signifies a confirmation through the provision of objective evidence (analysis, observation, measurement, test, records or other evidence) that specified requirements have been met. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global Standards  

Verification

An examination to confirm that an activity, a product or a service is in accordance with specified requirements. Guidance note: The examination shall be based on information, which can be proved true, based on facts obtained through observation, measurement, test or other means. ISO 8402: 1994: Verification: Confirmation by examination and provision of objective evidence that specified requirements has been fulfilled. Source: Verification of Lifting Appliances for the Oil and Gas Industry, DNV-OSS-308, October 2010, Det Norske Veritas AS, Global Standards
Verify

Verify

Definition(s)

Verify/verification

A quality control process used to evaluate whether or not a product, service, or system complies with a given criteria set (i.e. regulations, specifications, or conditions). NOTE Verification can be in development or production phases (often an internal process). Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
Verified Barrier

Verified Barrier

Definition(s)

Verified barrier

Barrier whose proper deployment has been substantiated through a postinstallation assessment or through observations recorded during its installation. NOTE A tested barrier has the greatest level of assurance. EXAMPLE Observations that can be recorded during a cement displacement operation to support the evaluation of the cement as a barrier include a mud displacement volume equal to the calculated capacity of the casing string, and observed lift pressure matching the calculated lift pressure. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards  
Variable Bore Ram

Variable Bore Ram

Definition(s)

Variable bore ram

Closing and sealing component in a ram blowout preventer that is capable of sealing on a range of tubular sizes. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

Variable bore ram

A pipe ram that seals on more than one pipe size. Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards