Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Wireline Safety Valve
Definition(s)
Wireline Safety Valve
A downhole safety valve that can be set and retrieved by wireline or slickline. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global StandardsWireline Work Areas
Definition(s)
Wireline Work Areas
Those areas in which wireline work is being performed on a well through a lubricator. API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2, Third Edition, December 2012, Global StandardsWireline/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 StandardsWithdrawal
Definition(s)
Withdrawal
cancellation of a certification, certificate or credential . Source: ISO/IEC TS 17027:2014, Conformity assessment – Vocabulary related to competence of persons used for certification of persons, Global StandardsWithdrawing Accreditation
Definition(s)
Withdrawing Accreditation
Process of cancelling accreditation in full. Source: ISO/IEC 17011:2004, Conformity assessment – General requirements for accreditation bodies accrediting conformity assessment bodies. Global StandardsWitnessing
Definition(s)
Witnessing
Observation of the CAB carrying out conformity assessment services within its scope of accreditation. Source: ISO/IEC 17011:2004, Conformity assessment – General requirements for accreditation bodies accrediting conformity assessment bodies. Global StandardsWitnessing
Signifies attending tests or measurements where the surveyor verify compliance with agreed test or measurement procedures. Source: Rules for Classification – Offshore units, DNVGL-OU-0101, Offshore drilling and support units, DNV GL, July 2015. Global StandardsWIV
Definition(s)
WIV
Water Injection Valve - see also DHIV. Source: 117 OLF, Norwegian Oil and Gas Association recommended guidelines for Well Integrity, No. 117, Revision No. 4, June 2011. Global StandardsWk
Definition(s)
Wk
Week. Source: API SPEC 17F, Specification for Subsea Production Control Systems, Second Edition, December 2006 (Reaffirmed April 2011). Global StandardsWLAN
Definition(s)
WLAN
Wireless local area network.Source: DNVGL-RP-G108, Cyber security in the oil and gas industry based on IEC 62443, DNV GL, September 2017. Global Standards
WLCPF
Definition(s)
WLCPF
Well Life Cycle Practices Forum. Source: Oil & Gas UK, Guidelines on subsea BOP systems, Issue 1, July 2012, Global StandardsWLL
Definition(s)
WLL
Working load limit <lifting set> Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsWLL
Maximum mass or weight that a lifting component is designed to sustain in lifting service. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsWLL
Working load limit <lifting set> Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsWLL
Working load limit. Source: Rules for Classification and Construction, IV Industrial Services, 6 Offshore Technology, 9 Guideline for Personnel Transfers by Means of Lifting Appliances, Edition 2011, Germanischer Lloyd SE, Global StandardsWLLmin
Definition(s)
WLLmin
Minimum working load limit. Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global StandardsWO
Definition(s)
WO
Work order. Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global StandardsWOB
Definition(s)
WOB
Weight on bit. Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global StandardsWOC
WOCS
Definition(s)
WOCS
Workover control system. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global StandardsWOR
Definition(s)
WOR
Workover riser. Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. 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. LegislationWork Area
Definition(s)
Work Area
area of the installation where personnel stay or move in connection with work. Source: Rules for Classification and Construction, IV Industrial Services, 6 Offshore Technology, 9 Guideline for Personnel Transfers by Means of Lifting Appliances, Edition 2011, Germanischer Lloyd SE, Global StandardsWork Environment
Definition(s)
Work Environment
The term “work environment” relates to those conditions under which work is performed including physical, environmental and other factors (such as noise, temperature, humidity, lighting or weather). Source: API SPEC Q1, Specification for Quality Programs for the Petroleum, Petrochemical and Natural Gas Industry, Upstream Segment, Eighth Edition, December 2007 (Addendum December 2010). Global StandardsWork Environment
Physical, chemical, biological, organizational, social and cultural factors surrounding a worker (2.4). Source: ISO 6385:2016, Ergonomics principles in the design of work systems, Third Edition, September 2016. Global StandardsWork Factor
Definition(s)
Work Factor
An estimate of the effort or time needed by a potential adversary, with specified expertise and resources, to overcome a protective measure. Adapted from: CNSSI 4009. Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global StandardsWork Fatigue
Definition(s)
Work Fatigue
Impairing non-pathological manifestation of work strain (2.11), completely reversible with rest.- Note 1 to entry: Work fatigue can be mental, physical, local and/or general. Note 2 to entry: Compare ISO 26800:2011, 2.5.
Work Organization
Definition(s)
Work Organization
Interacting work systems (2.2) acting to produce a specific overall outcome.- Note 1 to entry: The process of work organization includes coherent actions in relation to establishing the form and mode of organization to be adopted (e.g. individual or collective work, teams working separately or interdependently, etc.). It is also necessary to define and allocate resources and determine the means and channels of communication. All these actions lead to the definition and assignment of prescribed tasks to the operators involved.
Work Strain
Definition(s)
Work Strain
Internal response of a worker (2.4) to being exposed to external work load (2.10) depending on his/her individual characteristics (e.g. body size, age, capacities, abilities, skills, etc.).- Note 1 to entry: In ISO 26800, “work strain” is called “internal load”.
- Note 2 to entry: Compare ISO 26800:2011, 2.6.
Work String
Definition(s)
Work String
Tubular conduit used to convey well test tools downhole and provide a flow path for reservoir fluids to surface.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsWork String
The drill pipe or tubing used in well workover operations or abandonment operations to perform specific downhole tasks such as running squeeze cementing tools and stimulation packers, as well as performing stimulation, testing, cementing, wellbore cleanout, etc. operations. Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global StandardsWork String
Collective term for jointed pipe, coiled tubing and wireline, BHA excluded. Source: NORSOK D-002, Well intervention equipment, Rev. 2, June 2013. Global StandardsWork String Tester Valve
Definition(s)
Work String Tester Valve
A downhole device that is designed to integrity test the BHA and work string.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global StandardsWork System
Definition(s)
Work System
System comprising one or more workers (2.4) and work equipment (2.6) acting together to perform the system function (2.21), in the workspace (2.9), in the work environment (2.8), under the conditions imposed by the work tasks (2.17). Source: ISO 6385:2016, Ergonomics principles in the design of work systems, Third Edition, September 2016. Global StandardsWork Task
Definition(s)
Work Task
Activity or set of activities required of the worker (2.4) to achieve an intended outcome. Source: ISO 6385:2016, Ergonomics principles in the design of work systems, Third Edition, September 2016. Global StandardsWork-related
Definition(s)
Work-related
An injury or illness is presumed to be work-related if an event or exposure in the work environment either caused or contributed to the resulting condition or significantly aggravated a pre-existing injury or illness. Exceptions include:- Visitor or members of the general public;
- Voluntary participation in a wellness program such as the use of company-provided exercise equipment;
- Eating, drinking or preparing one’s own food;
- Cold or flu;
- Personal tasks outside working hours;
- Personal grooming, self-medication or self-infliction;
- Symptoms arising on site solely due to outside factors; or
- Motor vehicle accident during commute, provided the injured party is not within course and scope of employment.