Glossary
Browse the IADC Lexicon alphabetically or by category. Get comprehensive definitions of drilling industry terms.
Dead Line
Definition(s)
Dead Line
The line (which does not travel) from the crown block sheave to the anchor. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. RegulationsDead Line Stabilizer
Definition(s)
Dead Line Stabilizer
A device attached to the mast or derrick for restricting lateral movement of the dead line. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. RegulationsDeclaration
Definition(s)
Declaration
“Declaration” means a declaration of operator as required by Section 143.1 of the Federal Accord Act and Section 136.A1 of the Nova Scotia Accord Act. Source: Nova Scotia Offshore Petroleum Occupational Health & Safety Requirements, Canada-Nova Scotia Offshore Petroleum Board, Canada, December 2000. RegulationsDeclaration of Compliance
Definition(s)
Declaration of compliance
A form of confirmation of the products' compliance with the requirements of technical regulations. Source: Federal Law on Technical Regulation, No. 184-FZ, Russian Federation, December 2002 (amended September 2010). RegulationsDecommissioning Plan
Definition(s)
Decommissioning Plan
The licensee, the lessee, or as the case may be, the operator shall submit decommissioning plan to the competent authority including description of -
- risk during and following a possible removal;
- methods intended to be used in the event of a possible removal, including re-floating of the structure;
- analyses planned to be carried out;
- operations planned to be carried out in the event of a possible removal;
- consequences of a possible removal in respect of adjacent fields and facilities;
- other matters of importance; and
- measures, if any, designed to secure the area against possible future pollution from abandoned wells or polluted deposits of cuttings.
Decompression
Definition(s)
Decompression
“Decompression” means the gradual reduction of the pressures of the inert components of a breathing mixture in the body (décompression). 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. RegulationsDecompression Sickness
Definition(s)
Decompression Sickness
“Decompression sickness” means a condition caused by the reduction or other changes of pressure on or in the body (maladie de la décompression). 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. RegulationsDecompression 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).
Decompression 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).
Decompression 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).
Dedicated Injection Well
Definition(s)
Dedicated Injection Well
DEDICATED INJECTION WELL shall mean any well as defined under 40 C.F.R. §144.5 B, 1992 Edition, (adopted by the U.S. Environmental Protection Agency) used for the exclusive purpose of injecting fluids or gas from the surface. The definition of a dedicated injection well does not include gas storage wells. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. RegulationsDeep Pool
Definition(s)
Deep Pool
“Deep pool” means a common source of supply that is situated 5000 feet or more below the surface. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. RegulationsDeepest Fresh Groundwater
Definition(s)
Deepest Fresh Groundwater
Deepest fresh groundwater—The deepest fresh groundwater bearing formation penetrated by the wellbore as determined from drillers logs from the well or from other wells in the area surrounding the well or from historical records of the normal surface casing seat depths in the area surrounding the well, whichever is deeper. Source: Oil and Gas Wells, Pennsylvania Code, Title 25, Chapter 78, December 2012. RegulationsDeepwater Well Control
Definition(s)
Deepwater well control:
Deepwater well control means well control when you are using a subsea BOP system. Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). RegulationsDefect
Definition(s)
Defect
An imperfection whose type or size exceeds the applicable acceptance criteria and is therefore rejectable.
Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global StandardsDefect
An imperfection of a type or magnitude exceeding the acceptance criteria.
Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global StandardsDefect
An imperfection, whose type or size, exceeds the applicable acceptance criteria. Source: API 510, Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration Downstream Segment, Ninth Edition, June 2006. Global StandardsDefect
An imperfection, fault, or flaw in a component of an existing platform. As used in this recommended practice, the term "defect" does not necessarily denote that the platform is not fit-for-purpose. Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global StandardsDefect
Imperfection of sufficient magnitude or properties to warrant rejection of OCTG based on the specified acceptance criteria. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global StandardsDefect
Imperfection having sufficient magnitude to warrant rejection of the product based on the criteria defined in this International Standard. Source: API SPEC 5CRA, Specification for Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock, Upstream Segment, First Edition, February 2010 (Errata August 2011). Global StandardsDefect
Imperfection of sufficient magnitude to warrant rejection of the product based on criteria defined in this Standard. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global StandardsDefect
Imperfection of sufficient magnitude to warrant rejection of the product based on criteria defined in this International Standard. [ISO 11960:2004, definition 4.1.11]. Source: API SPEC 5DP, Specification for Drill Pipe, First Edition, August 2009. Global StandardsDefect
"Defect" means any characteristic or condition which tends to weaken or reduce the strength of the tool, object or structure of which it is a part, beyond the recognized operating limitations of the tool, object or structure. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. RegulationsDefence Forces of the Union
Definition(s)
Defence Forces of the Union
“Defence Forces of the Union” includes General Reserve Engineering Forces under the Director General, Border Road, the Central Reserve Police Force, Assam Rifles, Border Security Force and National Security Guard under the Ministry of Home Affairs and Special Security Bureau under the Cabinet Secretariat. Source: The Petroleum Rules, 1976, India, 1976. Regulations Source: The Petroleum Rules, 2002, India, 13th March 2002. RegulationsDeficient Wells
Definition(s)
Deficient Wells
Deficient Wells―with reference to this particular order, wells producing more than 25 percent BS&W, and/or incapable of producing the current monthly depth bracket allowable. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. RegulationsDelegate
Definition(s)
Delegate
The person authorized by the director to take action on behalf of the Railroad Commission of Texas under this section. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsDeleterious Substances
Definition(s)
Deleterious Substances
"Deleterious substances" means any chemical, salt water, oil field brine, waste oil, waste emulsified oil, basic sediment, mud, or injurious substance produced or used in the drilling, development, production, transportation, refining, and processing of oil, gas and/or brine mining. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. RegulationsDelineation Well
Definition(s)
Delineation Well
In these Regulations, “delineation well”, “development well” and “exploratory well” have the same meaning as in subsection 101(1) of the Canada Petroleum Resources Act. Source: Canada Oil and Gas Drilling and Production Regulations, SOR/2009-315, February 2013. RegulationsDelineation Well
“Delineation well” means a well that is so located in relation to another well penetrating an accumulation of petroleum that there is a reasonable expectation that another portion of that accumulation will be penetrated by the first-mentioned well and that the drilling is necessary in order to determine the commercial value of the accumulation. Source: Drilling and Production Guidelines, The Canada-Nova Scotia Offshore Petroleum Board and Canada-Newfoundland and Labrador Offshore Petroleum Board, Canada, March 31, 2011. Regulatory Guidance Source: Canada Petroleum Resources Act, R.S.C. 1985, c. 36 (2nd Supp.), current to April 29, 2013. Legislation Source: Canada-Nova Scotia Offshore Petroleum Resources Accord Implementation Act, S.C. 1988, c. 28, Canada, current to May 26, 2013. LegislationDelineation Well
In these Regulations, “delineation well”, “development well” and “exploratory well” have the same meaning as in subsection 122(1) of the Act. Source: Nova Scotia Offshore Petroleum Drilling and Production Regulations, SOR/2009-317, Canada, current to May 31, 2012. RegulationsDelinquent Inactive Well
Definition(s)
Delinquent Inactive Well
An inactive well for which, after notice and opportunity for a hearing, the Commission or its delegate has not extended the plugging deadline.1Source(s)
Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations
Department
Definition(s)
Department
Department―the Department of Conservation of the state of Louisiana. Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. RegulationsDepartment
"Department" means the Department of Workforce Services. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. RegulationsDepartment
Department means the department of State that, with the authority of the Prime Minister, is for the time being responsible for the administration of this Act. Source: Health and Safety in Employment Act 1992, Public Act 1992 No 96, New Zealand, as of 1 July 2011. LegislationDepartment Of The Army Permits
Definition(s)
Department Of The Army Permits
Individual or general permits or letters of permission issued by the U.S. Army Corps of Engineers under the authority of the Federal Clean Water Act, §404, or the Rivers and Harbors Act of 1899, §9 and §10, United States Code, Title 33, §402 and §403. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsDepartment Of Transportation Or DOT
Definition(s)
Department Of Transportation Or DOT
The United States Department of Transportation. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. RegulationsDepartures
Definition(s)
Departures:
Departures mean approvals granted by the appropriate BSEE or BOEM representative for operating requirements/procedures other than those specified in the regulations found in this part. These requirements/procedures may be necessary to control a well; properly develop a lease; conserve natural resources, or protect life, property, or the marine, coastal, or human environment. Source: Oil and Gas and Sulphur Operations in the Outer Continental Shelf, 30 CFR 250 (2013). RegulationsDependent Contractor
Definition(s)
Dependent Contractor
A person, whether or not employed under a contract of employment and whether or not furnishing the person’s own tools, vehicles, equipment, machinery, material or any other thing, who performs work or services for another on such terms and conditions that the person is in a position of economic dependence upon the other, under an obligation to perform duties mainly for the other, and in a relationship with the other more closely resembling that of an employee than an independent contractor. Note: 6 OSH (NS) Element 1, Part 1, Section 1.1. 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 GuidanceDependent Contractor
“Dependent contractor” means a person, whether or not employed under a contract of employment and whether or not furnishing the person’s own tools, vehicles, equipment, machinery, material or any other thing, who performs work or services for another on such terms and conditions that the person is- in a position of economic dependence upon the other,
- under an obligation to perform duties mainly for the other, and
- in a relationship with the other more closely resembling that of an employee than an independent contractor.