Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Informative References
Definition(s)
Informative References
Shall mean informative in the application of NORSOK standards. Source: NORSOK D-007, Well Testing Systems, Rev. 1, January 1996. Global StandardsSafety Head
Definition(s)
Safety Head
Upper closure device of the secondary barrier. Source: NORSOK D-002, Well intervention equipment, Rev. 2, June 2013. Global StandardsMaximum Anticipated Operating Pressure
Definition(s)
Maximum Anticipated Operating Pressure
The highest calculated pressure that a given equipment component will be subjected to during the execution of the prescribed service and/or during a contingency operation. The maximum anticipated operating pressure may be equal or greater than the maximum anticipated surface pressure. Source: NORSOK D-002, Well intervention equipment, Rev. 2, June 2013. Global StandardsIntervention
Definition(s)
Intervention
Operation to enter the well which requires breaking containment of an existing well barrier. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global StandardsIntervention
Well servicing operations conducted within a completed wellbore. Source: NORSOK D-002, Well intervention equipment, Rev. 2, June 2013. Global StandardsFluid Pumps
Definition(s)
Fluid Pumps
Fluid pumps includes positive displacement pumps, electric or diesel driven, used for well intervention activities such as; flush and test circulation systems, testing of well barriers, circulation through work string, well stimulation and other pumping application that requires high volume or pressure. Pumps may also be used as well kill pumps for well intervention activities. Source: NORSOK D-002, Well intervention equipment, Rev. 2, June 2013. Global StandardsWCI
Definition(s)
WCI
Wind shield index. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsVPH
Definition(s)
VPH
Vertical pipe handling. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsVDU
Definition(s)
VDU
Visual display unit. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsUDL
Definition(s)
UDL
Uniform distributed load. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsSG
Definition(s)
SG
Specific gravity. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsRPM
Definition(s)
RPM
Revolutions per minute. Source: Deepwater Well Control Guidelines. IADC Guidelines Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsRARS
Definition(s)
RARS
Riser anti-recoil system. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsPV
Definition(s)
PV
Pressure vessel. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsPL
Definition(s)
PL
Protection level. Source: DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global StandardsPL
Point load. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsP&A
Definition(s)
P&A
Plug and abandon. Source: API Bulletin 97, Well Construction Interface Document Guidelines, First Edition, December 2013. Global Standards Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsNWEA
Definition(s)
NWEA
North West European Area. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsML
Definition(s)
ML
Mud logging. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsMEWHP
Definition(s)
MEWHP
Maximum expected wellhead pressure. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsLIR
Definition(s)
LIR
Local instrument room. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsLER
Definition(s)
LER
Local equipment room.
Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global Standards
KEMS
Definition(s)
KEMS
Kinetic energy measuring system. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsFlow Allocation
Definition(s)
Flow Allocation
Flow allocation procedure means the procedure to- allocate total measured quantities of petroleum and water produced from or injected into a pool or zone back to individual wells in a pool or zone where individual well production or injection is not measured separately; and
- allocate production to fields that are using a common storage or processing facility.
Drilling Support Module
Definition(s)
Drilling Support Module
Structure that can include diesel generator set, fuel tank, air compressor and storage tank, sack storage and mud mixing, electric drive and associated control system, mud tank, mud pump and auxiliary equipment, pipe deck area, piping and cable tray used to provide power, circulation and other functions to the drilling rig. Source: ISO 18647:2017, Petroleum and natural gas industries — Modular drilling rigs for offshore fixed platforms, First Edition, August 2017. Global StandardsDrilling PC Network
Definition(s)
Drilling PC Network (DPcN)
DCDA system’s PC network. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsDrilling Facilities
Definition(s)
Drilling Facilities
Structures containing systems, equipment and utilities required for drilling operations. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsDrilling Control Systems
Definition(s)
Drilling Control Systems (DCS)
Generic term for drilling control systems, include instrumentation, e.g. DCDA, BOP, Cement, CRI, Mud Mix. ML, MWD etc. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsDrilling Control Network
Definition(s)
Drilling Control Network (DCN)
DCDA system’s control network (controller level). Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsDrilling Control and Data Acquisition
Definition(s)
Drilling Control and Data Acquisition (DCDA)
Specific drilling control system mainly used by operators in driller’s cabin and information with regards to drilling data for the entire drilling rig. Source: NORSOK D-001, Drilling facilities, Rev. 3, December 2012. Global StandardsDES
Definition(s)
DES
Set of equipment that includes derrick/mast, substructure, drawworks, crown block, traveling block, hook, TDS, rotary table, BOP, driller’s cabin, drill floor equipment, choke and kill manifold and can also include shale shakers, degasser, desander, desilter, centrifuge, cuttings dryer, pipe handling system and BOP handling system etc., used to implement hoisting and rotating functions during drilling operations.- Note. 1 to entry: The drilling equipment set is generally movable by means of skid rails such that the centre can be positioned over one of a number of well slots.