Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
CTOD
Definition(s)
CTOD
Crack tip opening displacement. 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 Source: Offshore Standard DNV-OS-C101, Design of Offshore Steel Structures, General (LRFD Method, Det Norske Veritas, April 2011. Global StandardsCTOD
Measure of crack severity which can be compared against a critical value at the onset of failure. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global StandardsWork
Definition(s)
Work
All activities to be performed within relevant contract(s) issued by designer, owner, operator, contractor, fabricator or manufacturer. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsWork
Force applied through a distance. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsWork
Work has the meaning given by clause 3 of Schedule 3 to the Act. Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. RegulationsWork
Work means work offshore that is directly or indirectly related to the construction, installation, operation, maintenance or decommissioning of a facility. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationWireline/Coiled Tubing BOP
Definition(s)
Wireline/Coiled Tubing BOP (WCT-BOP)
Subsea BOP that attaches to the top of a subsea tree to facilitate wireline or coiled tubing intervention. NOTE WCT-BOP rams are designed to shear wireline or coiled tubing and seal the bore, in one operation. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsWell Completion
Definition(s)
Well Completion
Well operations including tubing installation, well perforation and test production. 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 StandardsWear Bushing
Definition(s)
Wear Bushing
Bushing to be installed in the rotary table, to provide a smooth lateral support to the workover riser at drill floor level. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsWear Bushing
Retrievable cylindrical device that protects the internal surfaces of wellhead equipment and the top of the last casing suspended. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global StandardsWear Bushing
Bore protector that also protects the casing hanger below it. Source: API SPEC 17D, Design and Operation of Subsea Production Systems—Subsea Wellhead and Tree Equipment, Upstream Segment, Second Edition May 2011 (Errata September 2011). Global StandardsWave Frequency Motion
Definition(s)
Wave Frequency Motion
Motion of the vessel at the frequencies of incident waves. 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 StandardsVessel Offset
Definition(s)
Vessel Offset
Total offset of the vessel, taking into account the vessel mean offset, wave frequency motions and low-frequency wind and wave motions. 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 StandardsVessel Mean Offset
Definition(s)
Vessel Mean Offset
Offset created by steady forces from current, wind and waves. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsUmbilical Clamp
Definition(s)
Umbilical Clamp
Clamp used to attach the umbilical(s) to the riser joints. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTubing Riser
Definition(s)
Tubing Riser
Riser which consists of one or more individual strings of production tubing and a hydraulic control umbilical. NOTE If multiple tubing strings are used, they can be left either independent of each other, or secured together using some type of clamping device. The hydraulic control umbilical is normally clamped or strapped to one of the tubing strings as it is run. 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 StandardsTubing Hanger Running Tool
Definition(s)
Tubing Hanger Running Tool
Device used to run, land and lock the tubing hanger inside the wellhead, tubing spool, or subsea tree. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTubing Hanger
Definition(s)
Tubing Hanger
Component used to support the downhole completion tubing string. NOTE It is also typically used to seal and contain the completion annulus from the environment. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTree Running Tool
Definition(s)
Tree Running Tool
Device used to run and land the subsea tree on the subsea wellhead. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTop Tensioned Riser
Definition(s)
Top Tensioned Riser
Vertical or nearly vertical riser supported by top tension in combination with boundary conditions that allow for relative riser/vessel motions in vertical direction and constrained to follow the horizontal vessel motion at one or several locations. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTime Domain
Definition(s)
Time Domain
Timewise, incremental simulation of riser response. NOTE Offers the capability of modelling hydrodynamic and structural non-linearity. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTensioner System
Definition(s)
Tensioner System
Device that applies a tension to the riser string while compensating for the relative vertical motion (stroke) between the floating vessel and the top of the deployed riser string. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global StandardsTensioner System
Device that applies a close to constant tension to the riser string while compensating for the relative vertical motion (stroke) between the floating vessel and the top of the deployed riser string. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTension Ring
Definition(s)
Tension Ring
Attachment point on the tension joint for the floating vessel tensioners. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global StandardsTension Ring
Attachment point on the tension joint for the floating vessel tensioning lines. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsTension Ring
Support ring around the top of the joint where tensioner lines are attached. 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 StandardsTension Joint
Definition(s)
Tension Joint
Special riser joint which provides a means for attaching a vertical riser to the floating vessel's tensioning system. Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global StandardsTension Joint
Special riser joint that provides a means for tensioning the C/WO riser with the floating vessel's tensioning system during open-sea workover mode. NOTE When in use, the tension joint is located below the slick joint, which has a provision for attaching the tensioner unit to the riser. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsSystem 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 StandardsSystem 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 StandardsSurge 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 StandardsPressure Control
Rapid change in line or vessel pressure. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsSupport 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 StandardsSurface 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 StandardsSurface 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 StandardsSurface 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 StandardsSubsea 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 StandardsStroke
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 StandardsStroke
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.
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.