Main Tube

Main Tube

Definition(s)

Main Tube (riser pipe)

Pipe that is the principal conduit of the riser joint; the conduit for guiding the drill string into the well and returning fluid flow from the well.

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

Lower Stack

Definition(s)

Lower Stack

Lower section of a subsea BOP stack that contains BOP spools, valves, hydraulic connectors, and nipples that typically connect to the subsea wellhead, subsea tree, or tubing head spool (below) and LMRP (above). Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards
Keel Joint

Keel Joint

Definition(s)

Keel Joint

Riser joint designed to withstand contact between the riser and the bottom of the moonpool.

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

Jumper Line (hose)

Definition(s)

Jumper Line (hose)

Flexible section of choke, kill, or auxiliary line that provides for continuous flow around a flex/ball joint while accommodating the angular motion at the flex/ball joint.

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

Intermediate Flex Joint

Definition(s)

Intermediate Flex Joint

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

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 Standards
Full-length Riser Joint

Full-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 Standards
Failsafe

Failsafe

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 Standards
Dual Gradient Drilling

Dual 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 Standards

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

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 Standards  

DGD

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 Standards  

DGD

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

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

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 Standards
Collapse Pressure

Collapse 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 Standards

Collapse 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 Standards
Choke and Kill Lines

Choke 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 Standards  

Choke-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 Standards  

Choke-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 Standards
C/K Lines

C/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 Standards  

C/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 Standards
Breech-lock Coupling

Breech-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 Standards
Bottomhole Assembly

Bottomhole 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 Standards
Air Can

Air 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 Standards
Weldment

Weldment

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.
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
Utility Bolting

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.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

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.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards
SST

SST

Definition(s)

SST

Stainless steel. Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

SST

[austenitic] stainless steel. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards
SMAW

SMAW

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 Standards
SCWI

SCWI

Definition(s)

SCWI

Senior certified welding inspector. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards
Repair Weld

Repair 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 Standards
Rated Range

Rated 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 Standards
Pressure-retaining Part

Pressure-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.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards
Pressure-retaining Bolting

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.
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
Pressure-controlling Bolting

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 Standards  

Pressure-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.
Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards
Performance Requirement Level

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 Standards
Outlet Connection

Outlet 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 Standards