Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Contingency Plan
Definition(s)
Contingency Plan
“Contingency plan” means a plan that addresses abnormal conditions or emergencies that can reasonably be anticipated (plan d’urgence). Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsContingency Plan
“Contingency plan” means a contingency plan referred to in paragraph 4(4)(i) (plan d’urgence). Source: Canada Oil and Gas Diving Regulations, SOR/88-600, February 2013. RegulationsContingency Plan
"Contingency plan" is a written document which provides for an organized plan of action for alerting and protecting the public within an area of exposure following the accidental release of a potentially hazardous volume of poisonous gas such as hydrogen sulfide. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsContingency Plan
A written document that shall provide an organized plan of action for alerting and protecting the public within an area of exposure prior to an intentional release, or following the accidental release of a potentially hazardous volume of hydrogen sulfide. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsClassification Society
Definition(s)
Classification Society
“Classification society” means an independent organization whose purpose is to supervise the construction, ongoing maintenance and any modifications of an offshore platform in accordance with the society’s rules for classing offshore platforms and includes the American Bureau of Shipping, Lloyd’s Register of Shipping, Det norske Veritas Classification A/S and Bureau Veritas (société de classification). Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013.Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsChief
Definition(s)
Chief
“Chief” means the Chief Safety Officer (délégué) Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013.Regulations Source: Nova Scotia Offshore Certificate of Fitness Regulations, SOR/95-187, Canada, current to May 31, 2012. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsChief
“Chief” means the chief of the division of oil and gas resources management. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. RegulationsChief
“Chief” means chief, division of oil and gas. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. RegulationsChief
“Chief” means chief, Division of Mineral Resources Management. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. RegulationsChief
“Chief” means the Chief Conservation Officer as designated pursuant to section 144 of the Act. Source: Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. RegulationsOffshore Area
Definition(s)
Offshore Area
“Offshore Area” means the offshore area as defined by Article 43 of this Accord. Source: Canada – Nova Scotia Offshore Petroleum Resources Accord, Canada, August 26, 1986. LegislationOffshore Area
The area defined in the Accord Acts. Note: C-NAAIA 2; CNSOPRAIA 2. Source: Incident Reporting and Investigation Guidelines, The Canada-Nova Scotia Offshore Petroleum Board and Canada-Newfoundland and Labrador Offshore Petroleum Board, Canada, November 30, 2012. Regulatory GuidanceOffshore Area
“Offshore area” means Sable Island or any area of land not within a province that belongs to Her Majesty in right of Canada or in respect of which Her Majesty in right of Canada has the right to dispose of or exploit the natural resources and that is situated in submarine areas in the internal waters of Canada, the territorial sea of Canada or the continental shelf of Canada; zone extracôtière. Source: National Energy Board Act, R.S.C., 1985, c. N-7, Canada, current to April 29, 2013. LegislationOffshore Area
“Offshore area” means the lands and submarine areas within the limits described in Schedule 1 of the Accord Acts. Source: Canada-Nova Scotia Offshore Petroleum Resources Accord Implementation Act, S.C. 1988, c. 28, Canada, current to May 26, 2013. Legislation Source: Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. RegulationsOffshore Area
Offshore area means:- the offshore area of New South Wales; or
- the offshore area of Victoria; or
- the offshore area of Queensland; or
- the offshore area of Western Australia; or
- the offshore area of South Australia; or
- the offshore area of Tasmania; or
- the Principal Northern Territory offshore area; or
- the Eastern Greater Sunrise offshore area; or
- the offshore area of Norfolk Island; or
- the offshore area of the Territory of Christmas Island; or
- the offshore area of the Territory of Cocos (Keeling) Islands; or
- the offshore area of the Territory of Ashmore and Cartier Islands; or
- the offshore area of the Territory of Heard Island and McDonald Islands;
Certificate of Fitness
Definition(s)
Certificate of Fitness
“Certificate of fitness” means a certificate issued by a certifying authority in accordance with section 4 of the Canada Oil and Gas Certificate of Fitness Regulations (certificat de conformité) Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013. Regulations Source: Nova Scotia Offshore Certificate of Fitness Regulations, SOR/95-187, Canada, current to May 31, 2012. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. RegulationsCertificate of Fitness
“Certificate of fitness” means a certificate, in the form fixed by the Board, issued by a certifying authority in accordance with section 4 of the Nova Scotia Offshore Certificate of Fitness Regulations; certificat de conformité
Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsAccommodation Installation
Definition(s)
Accommodation Installation
“Accommodation installation” means an installation that is used to accommodate persons at a production site or drill site and that functions independently of a production installation, drilling installation or diving installation, and includes any associated dependent diving system (installation d’habitation) Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013. Regulations Source: Nova Scotia Offshore Certificate of Fitness Regulations, SOR/95-187, Canada, current to May 31, 2012. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsAccommodation Area
Definition(s)
Accommodation Area
“Accommodation area” means dependent personnel accommodation or an accommodation installation (secteur d’habitation). Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsCertifying Authority
Definition(s)
Certifying Authority
A third-party organization used to certify and approve the design, fabrication, equipment and operation of the crane. Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Seventh Edition, December 2014. Global StandardsCertifying Authority
“Certifying authority” has the same meaning as in section 2 of the Canada Oil and Gas Certificate of Fitness Regulations (autorité). Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013.RegulationsCertifying Authority
“Certifying authority” means, for the purposes of section 143.2 of the Act, the American Bureau of Shipping, Bureau Veritas, Det norskeVeritas Classification A/S, Germanischer Lloyd or Lloyd’s Register North America, Inc.; autorité. Source: Nova Scotia Offshore Certificate of Fitness Regulations, SOR/95-187, Canada, current to May 31, 2012. RegulationsCertifying Authority
“Certifying authority” has the same meaning as in section 2 of the Nova Scotia Offshore Certificate of Fitness Regulations. Source: Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. Regulations Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. Regulations Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. RegulationsOil Well
Definition(s)
Oil Well
"Oil well" means a well that produces predominantly oil at a gas-oil ratio of 100,000 scf/stb or lower, unless on a pool-by-pool basis the commission establishes another ratio. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. RegulationsOil Well
“Oil well” means any well capable of producing oil and not being a gas well (puits de pétrole). Source: Canada Oil and Gas Drilling and Production Regulations, C.R.C., c. 1517, February 2013. RegulationsOil Well
OIL WELL shall mean a well, the principal production of which at the mouth of the well is oil, as defined by the Act. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsOil Well
"Oil well" means any well capable of producing oil or oil and casinghead gas from a common source of supply as determined by the commission. Source: Oil and gas Conservation, North Dakota Administrative Code, Chapter 43-02-03, April 2012. RegulationsOil Well
“Oil well” means a well capable of producing oil and that is not a gas well as defined in Paragraph (6) of Subsection G of 19.15.2.7 NMAC. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsOil Well
Any well which produces one barrel or more crude petroleum oil to each 100,000 cubic feet of natural gas. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsGas Well
Definition(s)
Gas Well
"Gas well" means a well that produces predominantly gas at a gas-oil ratio over 100,000 scf/stb, unless on a pool-by-pool basis the commission establishes another ratio. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. RegulationsGas Well
“Gas well” means a well- that produces natural gas not associated or blended with oil at the time of production,
- that produces more than 30,000 cubic feet of natural gas to each barrel of oil from the same producing horizon,
- wherein the gas producing stratum has been successfully segregated from the oil and the gas is produced separately, or
- that is classified as a gas well by the Minister for any reason (puits de gaz).
Gas Well
GAS WELL shall mean a well, the principal production of which at the mouth of the well is gas, as defined by the Act. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsGas Well
"Gas well" means a well producing gas or natural gas from a common source of gas supply as determined by the commission. Source: Oil and gas Conservation, North Dakota Administrative Code, Chapter 43-02-03, April 2012. RegulationsGas Well
“Gas well” means a well producing gas from a gas pool, or a well with a gas-oil ratio in excess of 100,000 cubic feet of gas per barrel of oil producing from an oil pool. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsGas Well
“Gas well” means any well the production from which is predominantly natural gas or condensate, or both in quantity. Source: The Petroleum and Natural Gas Rules, 1959 (As amended from time to time), India, as amended as of May 2013. RegulationsGas-oil Ratio
Definition(s)
Gas-oil Ratio
"Gas-oil ratio" means the cubic feet of gas, determined at 60ø F and 14.65 psia, that are produced per stock tank barrel of oil produced. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. RegulationsGas-oil Ratio
“Gas-oil ratio” means the number of cubic feet of gas produced per barrel of oil (rapport gaz-pétrole). Source: Canada Oil and Gas Drilling and Production Regulations, C.R.C., c. 1517, February 2013. RegulationsGas-oil Ratio
"Gas-oil ratio" means the ratio of the gas produced in cubic feet [cubic meters] to a barrel of oil concurrently produced during any stated period. Source: Oil and gas Conservation, North Dakota Administrative Code, Chapter 43-02-03, April 2012. RegulationsGas-oil Ratio
“Gas-oil ratio” means the ratio of the casinghead gas produced in standard cubic feet to the number of barrels of oil concurrently produced during any stated period. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsBarrel(BBL)
Definition(s)
Barrel
"Barrel" means 42 U.S. gallons. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. RegulationsBarrel
“Barrel” means 35 gallons (baril). Source: Canada Oil and Gas Drilling and Production Regulations, C.R.C., c. 1517, February 2013. RegulationsBarrel
"Barrel" means 42 (U.S.) gallons at 60 F at atmospheric pressure. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsBarrel
“Barrel” means a quantity of liquid equal to forty-two U.S. gallons. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. RegulationsBarrel
Unit for volume of oil, the standard barrel contains 42 gallons.. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsBarrel
Barrel or Barrel of Oil―forty-two United States gallons of oil at a test of 60º F with deductions for the full percent of basic sediment, water and other impurities present, ascertained by centrifugal or other recognized and customary tests. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. RegulationsBarrel
BARREL shall mean 42 (U.S.) gallons at 60° F. at atmospheric pressure. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsBarrel
"Barrel" means forty-two United States gallons [158.99 liters] measured at sixty degrees Fahrenheit [15.56 degrees Celsius] and fourteen and seventy-three hundredths pounds per square inch absolute [1034.19 grams per square centimeter]. Source: Oil and gas Conservation, North Dakota Administrative Code, Chapter 43-02-03, April 2012. RegulationsBarrel
“Barrel” means 42 United States gallons measured at 60 degrees fahrenheit and atmospheric pressure at the sea level. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsBarrel
For the purpose of these sections, a "barrel" of crude petroleum is declared to be 42 gallons of 231 cubic inches per gallon at 60 degrees Fahrenheit. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsBarrel
A liquid measure of 42 U. S. gallons (158.9 liters). Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. RegulationsContinental Shelf
Definition(s)
Continental Shelf
Continental shelf means the continental shelf (within the meaning of the Seas and Submerged Lands Act 1973) adjacent to the coast of:- Australia (including the coast of any island forming part of a State or Territory); or
- a Territory.
Continental Shelf
The continental shelf of a coastal State comprises the sea-bed and subsoil of the submarine areas that extend beyond its territorial sea throughout the natural prolongation of its land territory to the outer edge of the continental margin, or to a distance of 200 nautical miles from the baselines from which the breadth of the territorial sea is measured where the outer edge of the continental margin does not extend up to that distance. Source: United Nations Convention on the Law of the Sea (UNCLOS), 1982. LegislationContinental Shelf
The seabed and subsoil of the marine areas extending beyond the Norwegian territorial sea, throughout the natural prolongation of the Norwegian land territory to the outer edge of the continental margin, but no less than 200 nautical miles from the base lines from which the breadth of the territorial sea is measured, however, not beyond the median line to another state, unless otherwise can be derived from the rules of international law for the continental shelf beyond 200 nautical miles from the base lines, or from an agreement with the relevant state. Source: Act 29 November 1996 No. 72 Relating to Petroleum Activities, Norway, amended June 2011. LegislationContinental Shelf
By continental shelf shall be understood the sea bed and subsoil of the submarine areas that extend beyond the Norwegian territorial sea throughout the natural prolongation of its land territory to the outer edge of the continental margin, but no less than 200 nautical miles from the base lines from which the territorial sea has been measured, nevertheless not beyond the median line in relation to other states. Source: Act 29 November 1996 No. 72 Relating to Petroleum Activities, Norway, amended June 2011. LegislationContinental Shelf
Continental shelf: that part of the sea bed located beneath the North Sea and the subsoil thereof, over which the Kingdom, in accordance with the Treaty of the Law of the Sea, signed at Montego-Bay on 10 December 1982 (Tractatenblad 1983, 83), has sovereign rights, and which is located on the seaward side of the line referred to in Article 1.1 of the Wet grenzen Nederlandse territoriale zee. Source: Mining Act of the Netherlands, Netherlands, 2003 (as amended up to 2012). LegislationContinental Shelf
“Continental Shelf” means the seabed and sub-soil or submarine areas adjacent to the coast of India including its island but outside the area of its territorial waters, to a depth of 200 metres, or beyond that limit to where the depth of the superjacent water admits of the exploitation of natural resources of the areas. Source: The Petroleum and Natural Gas Rules, 1959 (As amended from time to time), India, as amended as of May 2013. RegulationsCommissioner
Definition(s)
Commissioner
Commissioner means a person appointed under section 780A. Source: Offshore Petroleum and Greenhouse Gas Storage Act 2006, Australia, amended 2012. LegislationCommissioner
Commissioner―the Commissioner of Conservation of the State of Louisiana. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. RegulationsCommissioner
Commissioner―the Commissioner of Conservation. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. RegulationsCoastal Waters
Definition(s)
Coastal waters
Coastal waters, in relation to a State or the Northern Territory, means so much of the scheduled area for the State or Territory as consists of:- the territorial sea; and
- any waters that are:
- on the landward side of the territorial sea; and
- not within the limits of the State or Territory.
Coastal waters
Waters under tidal influence and waters of the open Gulf of Mexico. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsStructural Casing
Definition(s)
Structural Casing
The outer string of large-diameter, heavy-wall pipe installed in wells drilled from floating installations to resist the bending moments imposed by the marine riser and to help support the wellhead installed on the conductor casing. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsStructural Casing
The outer string of large diameter, heavy-wall pipe installed in wells drilled from floating installations to isolate very shallow sediments from subsequent drilling and to resist the bending moments imposed by the marine riser and to help support the wellhead installed on the conductor casing. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsStructural Casing
"Structural casing" means a short string of large diameter pipe that is set by driving, jetting, or drilling to support unconsolidated shallow sediments, provide hole stability for initial drilling operations, and provide anchorage for a diverter system. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. RegulationsStripping
Definition(s)
Stripping
A procedure for running or pulling pipe from the well bore with pressure in the annulus. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsStripping
Adding or removing pipe from a pressured wellbore while controlling flow from the wellbore. Source: API SPEC 16RCD, Specification for Drill Through Equipment—Rotating Control Devices, Upstream Segment, First Edition, February 2005. Global StandardsStripping
Adding or removing drill pipe into a live or pressurized well after exceeding pipe light depth. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsStripping
“Stripping” means pulling or running pipe under pressure through a resilient sealing element and may also include the removing of rods and tubing from the well at the same time. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. RegulationsSour Gas
Definition(s)
Sour Gas
Natural gas containing hydrogen sulfide. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsSour Gas
Natural gas containing hydrogen sulfide. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsSour Gas
Any natural gas containing more than 1 1/2 grains of hydrogen sulphide per 100 cubic feet or more than 30 grains of total sulphur per 100 cubic feet, or gas which in its natural state is found by the commission to be unfit for use in generating light or fuel for domestic purposes. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsSafety Factor
Definition(s)
Safety Factor
In the context of this publication, an incremental increase in drilling fluid density beyond the drilling fluid density indicated by calculations to be needed to contain a kicking formation. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsSafety Factor
"Safety Factor" means the ratio of the ultimate breaking strength of a member or piece of material or equipment to the actual working stress. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. RegulationsRotating Head
Definition(s)
Rotating Head (or Rotating Drilling Head)
A rotating, low pressure sealing device used in drilling operations utilizing air, gas, or foam (or any other drilling fluid whose hydrostatic pressure is less than the formation pressure) to seal around the drill stem above the top of the BOP stack. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsRotating Head
Low-pressure diverter designed to rotate with drill pipe and used mainly in air drilling. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsRotating Head
"Rotating head" means a rotating, pressure sealing device used in drilling operations utilizing air, gas, foam, or any other drilling fluid whose hydrostatic pressure is less than the formation pressure. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsProductivity Index
Definition(s)
Productivity Index (PI)
The PI represents one point on an inflow performance curve (IPR) and is defined as the well flow in barrels per day per psi pressure drop. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsProductivity Index
The continuous production capacity of a PI is a measure of rate (MSCFD) divided by the pressure drop to generate the flow rate (PSI). Index is MSCFD/PSI or Barrels per day per PSI. Source: IADC UBO / MPD Glossary, December 2011. Global StandardsProductivity Index (PI)
"Productivity index" means the daily production of oil in barrels per unit pressure differential between the static reservoir pressure and the stabilized flowing pressure during flow at a stated rate. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsNormal Pressure
Definition(s)
Normal Pressure
Formation pressure equal to the pressure exerted by a vertical column of water with salinity normal for the geographic area. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsNormal Pressure
"Normal pressure" means a formation pore pressure, proportional to depth, which is roughly equal to the hydrostatic pressure gradient of a column of salt water (.465 psi/ft). Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsDiverter System
Definition(s)
Diverter System
The assemblage of an annular sealing device, flow control means, vent system components, and control system which facilitates closure of the upward flow path of the well fluid and opening of the vent to the atmosphere. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsDiverter System
The assemblage of an annular sealing device, flow control means, vent system components, and control system which facilitates closure of the upward flow path of the well fluid and opening of the vent to the atmosphere. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global StandardsDiverter System
"Diverter system" means an assembly of nipples, valves, and piping attached to a well's structural or conductor casing for venting a gas kick away from the drill rig. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. RegulationsChoke Line
Definition(s)
Choke Line
The high-pressure piping between BOP outlets or wellhead outlets and the choke manifold. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsChoke Line
A high-pressure line connected below a BOP to transmit well fluid flow to the choke manifold during well control operations. Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global StandardsChoke Line
“Choke line” means an extension of pipe from the blowout preventer which is used to direct well fluid from the annulus to the choke manifold. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. RegulationsChoke Manifold
Definition(s)
Choke Manifold
Used to control flowing pressure from underbalance well. May be used on connections or trips to either keep production from displacing the drilling fluid (HP gas wells), or to artificially charge the annulus to avoid loading to reservoir pressure equilibrium (prolific oil wells). Source: IADC UBO / MPD Glossary, December 2011. Global StandardsChoke Manifold (Control Manifold)
The system of valves, chokes, and piping to control flows from the annulus and regulate pressures in the drill string/annulus flow system. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsChoke Manifold (Control Manifold)
"Choke manifold" means an assembly of valves, chokes, gauges, and lines used to control the rate of flow from the well when the blowout preventers are closed. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsCasing Pressure
Definition(s)
Casing Pressure
See Backpressure. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsCasing Pressure
"Casing pressure" means the pressure within the casing or between the casing and tubing at the wellhead. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsBOPE
Definition(s)
BOPE
An abbreviation for blowout preventer equipment. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global StandardsBOPE
"BOPE" means blowout prevention equipment. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. RegulationsDangerous Occurrence
Definition(s)
Dangerous occurrence
Dangerous occurrence has the meaning given by subregulation 2.41 (2). Source: Offshore Petroleum and Greenhouse Gas Storage (Safety) Regulations 2009 (Select Legislative Instrument 2009 No. 382 as amended), Australia, prepared on 1 January 2012. RegulationsDangerous occurence
For the definition of dangerous occurrence in clause 3 of Schedule 3 to the Act, an occurrence, at a facility, that is specified in the following table is a dangerous occurrence.- An occurrence that did not cause, but could reasonably have caused:
- the death of, or serious personal injury to, a person; or
- a member of the workforce to be incapacitated from performing work for the period mentioned in subregulation (1)
- A fire or explosion
- A collision of a marine vessel with the facility
- An uncontrolled release of hydrocarbon vapour exceeding 1 kilogram
- An uncontrolled release of petroleum liquids exceeding 80 litres
- A well kick exceeding 8 cubic metres (or 50 barrels)
- An unplanned event that required the emergency response plan to be implemented
- Damage to safety-critical equipment
- An occurrence to which items 1 to 8 do not apply that:
- results in significant damage to a pipeline (for example, reducing the capacity of the pipeline to contain petroleum or greenhouse gas substance flowing through it); or
- is likely to have a result of a kind mentioned in paragraph (a); or
- is of a kind that a reasonable pipeline licensee would consider to require immediate investigation
- Any other occurrence of a kind that a reasonable operator would consider to require an immediate investigation.