Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Diving Crew
Definition(s)
Diving Crew
“Diving crew” means the persons who are designated by a diving contractor to be involved in a diving operation conducted by the diving contractor and who are under the supervision of a supervisor (équipe de plongée). Source: Canada Oil and Gas Diving Regulations, SOR/88-600, February 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. RegulationsSurvival Probability
Definition(s)
Survival Probability, R(t)
Likelihood of the continued functioning of an item, as given by Equation (1): R(t ) = Pr (T > t ) (1) where Pr is the probability that T, the time to failure of an item, is greater than t, a time equal to or greater than 0. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsSRA
Definition(s)
SRA
Security Risk Assessment.
Source: API RP 781 Security Plan Methodology for the Oil and Natural Gas Industries.1st Ed. September 2016. Global StandardsSRA
Structural-reliability analysis. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsSIMOPS
Definition(s)
SIMOPS
Simultaneous Operations. Source: ISO 16530-1:2017, Petroleum and natural gas industries — Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards Source: API Bulletin 97, Well Construction Interface Document Guidelines, First Edition, December 2013. Global Standards Source: 117 OLF, Norwegian Oil and Gas Association recommended guidelines for Well Integrity, No. 117, Revision No. 4, June 2011. Global Standards Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC Guidelines Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsRoot Cause
Definition(s)
Root Cause
Circumstances during design, manufacture or use that have led to a failure. NOTE Generic failure cause codes applicable for equipment failures are defined in ISO 14224:2006, B.2.3. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsRisk Register
Definition(s)
Risk Register
Tool to record, follow up and close out actions related to relevant assessed risks- Note: 1 to entry: Each entry in the risk register typically includes a description of the risk, a description of the action(s), the responsible party, the due date, and status of the action.
Risk Register
A complete list of risks for a company, business, asset or project. Each risk in the register is normally briefly described and then, using a common process, characterised in terms of factors such as potential consequences, likelihood, priority or ranking, risk controls/barriers, residual risk type/classification, actions underway, review dare and owner. Source: IOGP Report No. 510, Operating Management System Framework for controlling risk and delivering high performance in the oil and gas industry, International Association of Oil & Gas Producers, June 2014. Global StandardsRisk Register
Tool to log, follow up and close out relevant risks. NOTE Each entry in the risk register should typically include ⎯ description of the risk, ⎯ description of the action(s), ⎯ responsible party, ⎯ due date, ⎯ action status. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsRisk Register
Record of information about identified risks (1.1). NOTE The term “risk log” is sometimes used instead of “risk register”. Source: ISO Guide 73:2009(E/F), Risk Management – Vocabulary, First Edition, 2009. Global StandardsReliability Data
Definition(s)
Reliability Data
Data for reliability, maintainability and maintenance support performance. NOTE Reliability and maintainability (RM) data is the term applied by ISO 14224:2006. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global Standards Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global StandardsDiving Bell
Definition(s)
Diving Bell
“Diving bell” means a compression chamber that is intended to be submerged and that is designed to transport a person at atmospheric pressure or divers at pressures greater than atmospheric pressure from the surface to an underwater work site and back and includes the compression chamber of a diving submersible (tourelle de plongée). Source: Canada Oil and Gas Diving Regulations, SOR/88-600, February 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. RegulationsDiving Bell
A diving bell is a submersible compression chamber used for transferring divers under pressure to and from the worksite. Source: Commercial Diving Projects Offshore, Diving at Work Regulations 1997, Approved Code of Practice (UK HSE L103), First Edition, 1998. Regulatory GuidanceDiving Bell
“Diving bell” means any compression chamber which is capable of being manned and is used or designed for use under the surface of water in supporting human life being a chamber in which any occupant is or may be subjected to a pressure of more than 300 millibars above atmospheric pressure during normal operation. Source: The Diving at Work Regulations 1997, UK S.I. 1997/2776, 1997. Regulations Source: The Offshore Installations (Safety Case) Regulations 2005, UK S.I. 2005/3117, 2005. RegulationsRBD
Definition(s)
RBD
Reliability block diagram. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsDiver
Definition(s)
Diver
“Diver” means a person who meets the requirements of section 53, 55 or 57, who is involved in a diving operation that is part of a diving program and who may be subject to pressures greater than atmospheric pressure (plongeur). Source: Canada Oil and Gas Diving Regulations, SOR/88-600, February 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. RegulationsDiver
“Diver” means a person at work who dives. Source: The Diving at Work Regulations 1997, UK S.I. 1997/2776, 1997. RegulationsProduction Performance
Definition(s)
Production Performance
Capacity of a system to meet demand for deliveries or performance. NOTE 1 Production availability, deliverability or other appropriate measures can be used to express production performance. NOTE 2 The use of production-performance terms should specify whether it represents a predicted or historic production performance. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsProduction Availability
Definition(s)
Production Availability
Ratio of production to planned production, or any other reference level, over a specified period of time. NOTE This measure is used in connection with analysis of delimited systems without compensating elements such as substitution from other producers and downstream buffer storage. Battery limits need to be defined in each case. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsProduction Assurance
Definition(s)
Production Assurance
Activities implemented to achieve and maintain a performance that is at its optimum in terms of the overall economy and at the same time consistent with applicable framework conditions. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsDive Time
Definition(s)
Dive Time
“Dive time” means the period commencing when a person begins pressurization or descent for a dive and terminating when the person completes decompression or ascent (durée de la plongée). Source: Canada Oil and Gas Diving Regulations, SOR/88-600, February 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. RegulationsProduction-Performance Analysis
Definition(s)
Production-Performance Analysis
Systematic evaluations and calculations carried out to assess the production performance of a system. NOTE The term should be used primarily for analysis of total systems, but may also be used for analysis of production unavailability of a partial system. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsDive Site
Definition(s)
Dive Site
“Dive site” means the place on a craft or installation from which a diving operation is conducted and from which a diver or pilot involved in the diving operation enters the water (lieu de plongée). Source: Canada Oil and Gas Diving Regulations, SOR/88-600, February 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. RegulationsPOR
Definition(s)
POR
Performance and operability review. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsDecompression Table
Definition(s)
Decompression Table
“Decompression table” means a table or set of tables that- shows a schedule of rates for safe descent and ascent and the appropriate breathing mixture to be used by a diver during a dive, and
- has been approved in accordance with section 5 (table de décompression).
PNA
Definition(s)
PNA
Petri net analysis. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsPerformance Requirements
Definition(s)
Performance Requirements
Required minimum level for the performance of a system. NOTE Requirements are normally quantitative but may also be qualitative. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsPerformance Objectives
Definition(s)
Performance Objectives
Indicative level for the desired performance. NOTE Objectives are expressed in qualitative or quantitative terms. Objectives are not absolute requirements and may be modified based on cost or technical constraints. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsPAP
Definition(s)
PAP
Production-assurance programme. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsDecompression Sickness Type II
Definition(s)
Decompression Sickness Type II
“Decompression sickness type II” means a decompression sickness that is characterized by one or more of the following symptoms, namely,- neurological manifestations related to the central nervous system,
- interference with the respiratory or cardiovascular system,
- otologic disorders, and
- any symptoms not referred to in the definition “decompression sickness type I” (maladie de la décompression de type II).
Observation Period
Definition(s)
Observation Period
Time period during which production performance and reliability data are recorded. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsDecompression Sickness Type I
Definition(s)
Decompression Sickness Type I
“Decompression sickness type I” means a decompression sickness that is characterized by one or both of the following symptoms, namely,- pain that is located at or near the joints of the limbs but is not felt in other parts of the body, and
- cutaneous manifestations including a rash and cutaneous pruritis (intense itching) (maladie de la décompression de type I).
MPA
Definition(s)
MPA
Markov process analysis. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsMean Time to Repair
Definition(s)
Mean Time to Repair
Expectation of the time to restoration. Source: ISO 20815:2008, Petroleum, petrochemical and natural gas industries – Production assurance and reliability management. Global StandardsMean Time to Repair
expected time to achieve the repair of a failed item Note 1 to entry: This term MTTR is used in ISO 14224[15] and ISO 20815[16] where the fault detection time is not really considered: ISO 14224[15] deals with detected faults (in fact, the actual time spent to detect the fault is never known and cannot be collected); ISO 20815[16] deals mainly with immediately revealed failure where t he t ime spent to detect the faults is close to 0 (i.e. negligible). As the fault detection time is very important for the purpose of this Technical Report there is a need to clearly distinguish between the two following times (cf. Figure 5): 1) the time elapsing from the actual occurrence of the failure of an item to its detection (cf. 3.1.35, MFDT); 2) the time elapsing from the detection of the failure of an item to the restoration of its function (cf. 3.1.33, MRT). Note 2 to entry: The acronym MTTR is defined as the mean time to restore in the IEC 60500–191[14] or in the IEC 61508[2]. This is not the same as in ISO 14224[15] or ISO 20815[16]. Therefore, in order to avoid any mixed-up, the acronym MTTRes is used in this Technical Report instead of MTTR (cf. 3.1.32).
Source: ISO/TR 12489:2013(E) Reliability modelling and calculation of safety systems. Global Standards