Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
IFJ
Definition(s)
IFJ
Intermediate flex joint. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsFull-length Riser Joint
Definition(s)
Full-length Riser Joint
Riser joint of standard length for a particular drilling vessel design or a particular riser string purchase.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsFailsafe
Definition(s)
Failsafe
Term applied to equipment of system so designed that, in the event of failure or malfunction of any part on the system, devices are automatically activated to stabilize or secure the safety of the operation.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsDual Gradient Drilling
Definition(s)
Dual Gradient Drilling
A drilling process that creates multiple pressure gradients to manage the annular pressure profile.
Source: ABS Guide for Classification and Certification of Managed Pressure Drilling Systems, September 2017. Global StandardsDual Gradient Drilling
Drilling technology that uses or simulates the effect of two fluids of different gradients in the annulus to create dual hydrostatic gradients to better manage the annular pressure profile.- NOTE: This technology is used to facilitate well construction through enhanced wellbore pressure management.
DGD
Definition(s)
DGD
Dual gradient drilling.
Source: ABS Guide for Classification and Certification of Managed Pressure Drilling Systems, September 2017. Global Standards
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsDGD
A drilling process that creates multiple pressure gradients to manage the annular pressure profile.
Source: ABS Guide for Classification and Certification of Managed Pressure Drilling Systems, September 2017. Global StandardsDGD
Drilling technology that uses or simulates the effect of two fluids of different gradients in the annulus to create dual hydrostatic gradients to better manage the annular pressure profile.- NOTE: This technology is used to facilitate well construction through enhanced wellbore pressure management.
Moonpool Line
Definition(s)
Moonpool Line
Flexible line connecting a choke, kill, and auxiliary line terminal fitting on the telescopic joint to the appropriate piping on the rig structure.- NOTE: A U-shaped bend in this flexible line accommodates vessel and telescopic joint inner barrel movement, while the outer barrel remains fixed and under tension.
Crossover Joint
Definition(s)
Crossover Joint
Special joint that provides for the interface between two different coupling designs.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsCollapse Pressure
Definition(s)
Collapse Pressure
External pressure differential which causes buckling collapse of a component. Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global StandardsCollapse Pressure
Differential (external minus internal) pressure at which structural failure is initiated within a tubular.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsChoke and Kill Lines
Definition(s)
Choke and Kill Lines
High-pressure line that allows fluids to be pumped into or removed from the well with the BOPs closed.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsChoke-and-Kill Line
External conduits, arranged laterally along the riser pipe, and used to circulate fluids into and out of the wellbore to control well pressure. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global StandardsChoke-and-Kill Line
External conduit arranged laterally along the riser pipe and used for circulation of fluids into and out of the wellbore to control well pressure. 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 StandardsC/K Lines
Definition(s)
C/K Lines
Choke and kill lines. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsC/K Lines
High-pressure line that allows fluids to be pumped into or removed from the well with the BOPs closed. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsBreech-lock Coupling
Definition(s)
Breech-lock Coupling
Coupling that is engaged by rotation of one member into an interlock with another member by a small angle, generally less than 45°. Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsBottomhole Assembly
Definition(s)
Bottomhole Assembly
Assembly composed of the bit, stabilizers, reamers, drill collars, various types of subs, etc., that is connected to the bottom of a string of drill pipe.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsAir Can
Definition(s)
Air Can
Closed top, open bottom cylinder forming an annulus around the outside of the riser pipe that is filled with air (or other low-density fluid) to provide buoyancy.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global StandardsWeldment
Definition(s)
Weldment
Portion or area of a component on which welding has been performed.- NOTE: A weldment includes the weld metal, the heat-affected zone (HAZ), and the base metal unaffected by the heat of welding.
Utility Bolting
Definition(s)
Utility Bolting
All bolting that is required to mount equipment and accessories to the drill-through equipment that is not closure bolting, pressure retaining, or pressure controlling.- NOTE: Examples: bolting on lifting eye, pad eye (nonwelded), wear bushing, name plate, clamps for tubing, guards.
Utility Bolting
All bolting that is required to mount equipment and accessories to the drill-through equipment that is not closure bolting, pressure retaining, or pressure controlling.- NOTE: Examples include bolting on lifting eyes, pad eyes (non-welded), wear bushing, nameplate, clamps for tubing, guards.
SST
Definition(s)
SST
Stainless steel. Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsSST
[austenitic] stainless steel. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsSMAW
Definition(s)
SMAW
Shielded metal arc welding. 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 StandardsSCWI
Definition(s)
SCWI
Senior certified welding inspector. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsRepair Weld
Definition(s)
Repair Weld
Welding performed to correct a nonconformance
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 StandardsRated Range
Definition(s)
Rated Range
Range of tubulars that can be sealed up to the full rated working pressure of the BOP. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsPressure-retaining Part
Definition(s)
Pressure-retaining Part
Part not exposed to wellbore fluids whose failure to function as intended will result in a release of wellbore fluid to the environment.- NOTE: An example is a clamp.
Pressure-retaining Bolting
Definition(s)
Pressure-retaining Bolting
Bolting used to assemble or join pressure-retaining parts whose failure would result in a release of wellbore fluid to the environment.- NOTE: Examples are studs and nuts on top of a hydraulic connector, and clamp bolts.
Pressure-controlling Bolting
Definition(s)
Pressure-controlling Bolting
Bolting used to assemble or join pressure-controlling part(s).NOTE: Examples include bolting on ram, seat or seal retainer bolting, shear ram blade bolting.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsPressure-controlling Bolting
Bolting used to assemble or join pressure-controlling part(s).- NOTE: Examples: bolting on ram, hydraulic operator cylinder bolting, hydraulic cylinder piston bolting, seat or seal retainer bolting, shear ram blade bolting.
Performance Requirement Level
Definition(s)
Performance Requirement Level
Designation determined by the extent of testing successfully performed in accordance with minimum performance criteria identified by this specification. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsOutlet Connection
Definition(s)
Outlet Connection
Clamp hub end connector and flange, studded or through bolted, or any other end connection with a bore that intersects the vertical drill-through bore. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsNon-sealing shear ram
Definition(s)
Non-sealing shear ram
Closing component in a ram blowout preventer that is capable of shearing or cutting certain tubulars, but does not seal. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsMultiple Indications
Definition(s)
Multiple Indications
Multiple indications are defined as two or more indications (each exceeding 50 % of the reference distance amplitude curve) within 13 mm (1/2 in) of each other in any direction.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards
Manufacturing Data Book
Definition(s)
Manufacturing Data Book
Composite file of records from a traceable API product that includes records associated with the original API product manufacturing, including certification records as required by this specification. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global StandardsManufacturing Data Book
Composite file of records from a traceable API product, which includes all records associated with the original API product manufacturing, including certification records as required by this standard.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global StandardsMDB
Definition(s)
MDB
Manufacturing data book. 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 StandardsMDB
Composite file of records from a traceable API product, which includes all records associated with the original API product manufacturing, including certification records as required by this standard.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards