Casing

Casing

Definition(s)

Casing

Pipe installed in the wellbore and usually cemented in place to retain the borehole dimension and seal off hydrocarbon and water-bearing formations.
  1. Surface casing: The outside and first pipe string installed in the wellbore, except for drive pipe or conductor pipe, to seal off surface sands; provide support for blowout prevention equipment and blowout protection; prevent loss of circulation while drilling deeper; and to protect fresh water sources. This casing is normally run to a depth below the base of the fresh water zones and cemented in place.
  2. Protective (intermediate) casing: A pipe string extending to the wellhead and installed inside of surface casing in wells of such depth without which drilling fluid cannot be balanced because of simultaneous lost circulation and high pressure entry of another zone, or in regions where abnormal pressure gradients are encountered.
  3. Production casing: The full length pipe string extending between the wellhead and an elevation at or below the producing formation, inside of protective or surface casing, and cemented in place to seal off productive zones and waterbearing formations.
  4. Liner: The partial length pipe string extending between the bottom of the borehole to an elevation above the bottom of the previous casing string. The liner may perform the same function as protective or production casing in sealing off producing zones and water-bearing formations. Liner may or may not be cemented in place. This term can also refer to a partial length pipe string set inside casing as a patch string.
  5. Tubing: Pipe installed in the wellbore inside casing strings and extending from the wellhead to a depth below, at, or above a producing, disposal, or injection formation. This is the pipe through which the produced or injected fluids flow.
Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Casing

Steel pipe used in oil wells to seal off fluids from the bore hole and to prevent the walls of the hole from sloughing off or caving in. Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards  

Casing

Pipe intended to line the walls of a drilled well. 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 Standards  

Casing

Pipe run from the surface and intended to line the walls of a drilled well. Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global Standards  

Casing

Pipe run from the surface and intended to line the walls of a drilled well. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Casing

Pipe extending from the surface and intended to line the walls of a drilled well. Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global Standards  

Casing

The casing category is included to store information on individual casing-string sections and associated casing failures. The casing category represents full lengths of individual casing sections and does not represent individual items threaded into the casing string, compared with the production/injection string. Sealing elements that are designed to seal off against leakage of hydrocarbons between the various sections of casing string (casing pack-offs) are not included. Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards  

Casing

“Casing” means lengths of steel pipe, coupled or connected together to form a continuous conduit in the well bore. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Casing

“Casing” means the pipe installed in the wellbore. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations    
Casing Liner

Casing Liner

Definition(s)

Casing Liner

Casing string with its uppermost point inside a previous casing string and not in the wellhead.

Source: ISO 16530-1:2017, Petroleum and natural gas industries - Well integrity – Part 1: Life cycle governance, First Edition, March 2017. Global Standards

Casing Liner

“Casing liner” means a casing that is suspended from a string of casing previously installed in a well and does not extend to the wellhead (tubage partiel). Source: Canada Oil and Gas Drilling and Production Regulations, SOR/2009-315, February 2013. Regulations 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: Nova Scotia Offshore Petroleum Drilling and Production Regulations, SOR/2009-317, Canada, current to May 31, 2012. Regulations
Casing Pressure

Casing Pressure

Definition(s)

Casing Pressure

See Backpressure. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  

Casing 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. Regulations  
Casing Seat

Casing Seat

Definition(s)

Casing Seat

Casing seat—The depth to which casing is set. Source: Oil and Gas Wells, Pennsylvania Code, Title 25, Chapter 78, December 2012. Regulations
Casing Shoe Test

Casing Shoe Test

Definition(s)

Casing Shoe Test

“Casing shoe test” means a pressure test conducted after drilling into the confining strata below a cemented casing string seat to evaluate pressure containment integrity and to determine the maximum fluid density that the strata can contain without breaking down. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations
Casing Stub

Casing Stub

Definition(s)

Casing Stub

"Casing stub" means the remnant of a casing string when the upper portion of the casing has been cut and recovered. Source: Alaska Oil and Gas Conservation Commission, Definitions, Alaska Admin. Code tit. 20, § 25.990, December 7, 2012. Regulations
Casinghead Gas

Casinghead Gas

Definition(s)

Casinghead Gas

"Casinghead gas" means any gas or vapor, or both gas and vapor, indigenous to and produced from a pool classified as an oil pool by the commission. Source: Oil and gas Conservation, North Dakota Administrative Code, Chapter 43-02-03, April 2012. Regulations  

Casinghead Gas

Any gas or vapor, or both, indigenous to an oil stratum and produced from such stratum with oil. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations  

Casinghead Gas

“Casinghead gas” means a gas or vapor or both gas and vapor indigenous to and produced from a pool the division classifies as an oil pool.  This also includes gas-cap gas produced from such an oil pool. Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations    
Casualty

Casualty

Definition(s)

Casualty

“Casualty” means a casualty or other accident involving loss of life or danger to life suffered by a person—
  1. employed on, on or working from an offshore installation; or
  2. on or working from an attendant vessel, in the course of any operation undertaken on or in connection with an offshore installation.
Source: The Offshore Installations (Inspectors and Casualties) Regulations 1973, UK S.I. 1973/1842, 1973. Regulations  
Category I Dive

Category I Dive

Definition(s)

Category I Dive

“Category I dive” means a dive to a depth of less than 50m using surface-oriented diving techniques and a breathing mixture of air, but no other breathing mixture except in cases of decompression, treatment or emergency, and includes a dive in which a diving bell or diving submersible is used for an observation dive, but does not include a lock-out dive; plongée de catégorie I. Source: Nova Scotia Offshore Area Petroleum Diving Regulations, SOR/95-189, Canada, current to May 31, 2012. Regulations
Category I Diving Operation

Category I Diving Operation

Definition(s)

Category I Diving Operation

“Category I diving operation” means a diving operation in which a category I dive is made (opérations de plongée de catégorie I). 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. Regulations
Category II Dive

Category II Dive

Definition(s)

Category II Dive

“Category II dive” means a dive in which a diving bell or diving submersible is used for a lock-out dive to a depth of less than 50 m using a breathing mixture of air, or to a depth of 50 m or more using a breathing mixture of mixed gas other than air, but does not include a saturation dive (plongée de catégorie II). 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. Regulations
Category II Diving Operation

Category II Diving Operation

Definition(s)

Category II Diving Operation

“category II diving operation” means a diving operation in which a category II dive is made (opérations de plongée de catégorie II). 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. Regulations
Category III Dive

Category III Dive

Definition(s)

Category III Dive

“Category III dive” means a saturation dive and any dive other than an ADS dive, a category I dive or a category II dive (plongée de catégorie III). 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. Regulations
Category III Diving Operation

Category III Diving Operation

Definition(s)

Category III Diving Operation

“Category III diving operation” means a diving operation in which a category III dive is made (opérations de plongée de catégorie III). 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. Regulations
Cathead

Cathead

Definition(s)

Catline, Cathead

Catline is a line powered by the cathead, which is a concave, rotating, pulley-type device mounted on the end of the cat shaft of the drawworks. Catlines are used to lift or pull equipment around a rig. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Cathead

“Cathead” means a rotating device mounted on the end of a shaft of the draw works. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  

Cathead

Unless referred to as “automatic” cathead, means a spool shaped metal mechanical device mounted on the end of a shaft on which a rope is wrapped. The rotating cathead imparts a pulling power to the rope that is wrapped on it. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Cathead, Automatic

Cathead, Automatic

Definition(s)

Cathead, Automatic

A clutch operated metal mechanical device consisting of a wheel having a flanged or flat surfaced rim or a spool shaped drum mounted on a shaft to which the end of a wire or fiber rope or chain is attached. The rotating cathead imparts a pulling power to the line attached to it. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Cathodic Protection Well

Cathodic Protection Well

Definition(s)

Cathodic Protection Well

Any well drilled for the purpose of installing one or more anodes to prevent corrosion of a facility associated with the production of oil, gas, or geothermal resources, such as a well casing, storage and separation facility, or pipeline. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations
Catline

Catline

Definition(s)

Catline, cathead

Catline is a line powered by the cathead, which is a concave, rotating, pulley-type device mounted on the end of the cat shaft of the drawworks. Catlines are used to lift or pull equipment around a rig. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Catline

A rope, usually reeved on a crown block sheave in a derrick or mast, for the primary purpose of lifting and transferring materials from one place to another about the derrick or mast floor. A rotating cathead imparts the pulling power to the catline that is wrapped on it. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Catwalk

Catwalk

Definition(s)

Catwalk

Elongated platform adjacent to the rig floor where pipe is laid out and lifted into the derrick. The catwalk is connected to the rig floor by a pipe ramp. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Catwalk

“Catwalk” means a elongated platform to the side of a rig where pipe is laid out and lifted into the derrick. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  
Catwalk (Derrick Walk or Mast Walk)

Catwalk (Derrick Walk or Mast Walk)

Definition(s)

Catwalk (Derrick Walk or Mast Walk)

A walkway extending from the derrick and/or mast to a point beyond the outer end of the drill pipe and casing storage rack at a well, the purpose of which is to facilitate the handling of such pipe between the rack and the derrick and/or mast. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Cavern

Cavern

Definition(s)

Cavern

The storage space created in a salt formation by solution mining. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations
CBMNG

CBMNG

Definition(s)

CBMNG

“CBMNG” Means Coal Bed Methane Natural Gas. "Combustible liquid" means any liquid having a flashpoint at or above 100°F. (37.8°C.). (See definition of "Flashpoint") Combustible liquids shall be divided into two classes as follows: (A) "Class II liquids" shall include those with flashpoints at or above 100°F. (37.8°C.) and below 140°F. (60°C.) except any mixture having components with flash points of 200°F. (93.3°C.) or higher, the volume of which make up ninety-nine (99) percent or more of the total volume of the mixture. Example: Stoddard Solvent; No.2 Fuel Oil. (B) "Class III liquids" shall include those with flashpoints at or above 140°F. (60°C.). Class III liquids are subdivided into two sub-classes:
  1. "Class IIIA liquids" shall include those with flashpoints at or above 140°F. (60°C.) and below 200°F. (93.3°C.), except any mixture having components with flashpoints of 200°F. (93.3°C.), or higher, the total volume of which make up ninety-nine (99) percent or more of the total volume of the mixture. Example: Fuel Oil No. 6.
  2. "Class IIIB liquids" shall include those with flashpoints at or above 200°F. (93.3°C.). Example: Ethylene Glycol.
(C) When a combustible liquid is heated for use to within 30°F. (16.7°C.) of its flashpoint, it shall be handled in accordance with the requirements for the next lower class of liquids. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. Regulations
Cease and Desist Order

Cease and Desist Order

Definition(s)

Cease and Desist Order

CEASE AND DESIST ORDER shall mean an order issued by the Commission or the Director pursuant to C.R.S.  §34-60-121(5). Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. Regulations  
Cell

Cell

Definition(s)

Cell

Cell―an earthen area constructed with an underdrain system within a land treatment facility used for the placement, land treatment and degradation of E and P Waste at a commercial facility. (A cell as defined in this Section is not considered a pit.). Source: Natural Resources, Office of Conservation – General Operations, Louisiana Administrative Code, Title 43, Part XIX, March 2013. Regulations  
Cellar

Cellar

Definition(s)

Cellar

Excavation around the wellhead to provide space for items of equipment at the top of the wellbore. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards  

Cellar

A pit beneath the rig floor to provide additional height between the rig floor and the wellhead and to allow the installation of the bops / rotating head / rotating diverter, rat hole mouse hole etc. Source: IADC UBO / MPD Glossary, December 2011. Global Standards  

Cellar

“Cellar” means an excavation around the wellhead to provide space for items of equipment at the top of the wellbore. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  

Cellar

An excavation around the well head to provide space for equipment at the top of the well bore. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Cement

Cement

Definition(s)

Cement

A powder consisting of alumina, silica, lime, and other substances that hardens when mixed with water. Cements are used in oil, gas, geothermal, injection, or water wells for protecting and supporting casing, isolating intervals within the wellbore, repairing casing leaks, sealing perforated or open hole intervals, and protecting fresh water aquifers. Well cements are manufactured to meet MI Specification lOA, which includes chemical, physical, and performance requirements for MI Classes A through H. 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 Standards  

Cement (or Portland Cement)

Ground clinker generally consisting of hydraulic calcium silicates and aluminates and usually containing one or more of the forms of calcium sulfate as an interground addition. NOTE 1 Hydraulic calcium silicates and aluminates are those which harden under water. NOTE 2 Interground additions are added before grinding, rather than after grinding. Source: API RP 10B-2, Recommended Practice for Testing Well Cements, First Edition, July 2005 (Reaffirmed: July 2010). Global Standards  

Cement

“Cement” means a complex, finely-ground kiln-fired calcium silicate which, when mixed with water, forms a slurry which will harden in the borehole to form an effective seal between the well bore and casing or tubing, or to effectively seal formations penetrated by the well bore. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Cement

Cement—A mixture of materials for bonding or sealing that attains a 7-day maximum permeability of 0.01 millidarcies and a 24-hour compressive strength of at least 500 psi in accordance with applicable standards and specifications. Source: Oil and Gas Wells, Pennsylvania Code, Title 25, Chapter 78, December 2012. Regulations  
Cement Job Log

Cement Job Log

Definition(s)

Cement Job Log

Cement job log—A written record that documents the actual procedures and specifications of the cementing operation. Source: Oil and Gas Wells, Pennsylvania Code, Title 25, Chapter 78, December 2012. Regulations
Cementing

Cementing

Definition(s)

Cementing

Making cement into a slurry and pumping it into a wellbore to perform functions such as supporting casing, isolating formations behind casing, protecting fresh water sands, and sealing perforations in casing. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Cementing

“Cementing” means the act of pumping a slurry into a wellbore to perform functions such as supporting and sealing casing, isolating formation behind casing, protecting freshwater formations, and sealing perforations in casing. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations
Centralized E&P Waste Management Facility

Centralized E&P Waste Management Facility

Definition(s)

Centralized E&P Waste Management Facility

CENTRALIZED E&P WASTE MANAGEMENT FACILITY shall mean a facility, other than a commercial disposal facility regulated by the Colorado Department of Public Health and Environment, that (1) is either used exclusively by one owner or operator or used by more than one operator under an operating agreement; and (2) is operated for a period greater than three (3) years; and (3) receives for collection, treatment, temporary storage, and/or disposal produced water, drilling fluids, completion fluids, and any other exempt E&P wastes that are generated from two or more production units or areas or from a set of commonly owned or operated leases. This definition includes oil-field naturally occurring radioactive materials (NORM) related storage, decontamination, treatment, or disposal. This definition excludes a facility that is permitted in accordance with Rule 903 pursuant to Rule 902.e. Source: Oil and Gas Conservation Commission, Practice and Procedure, Code of Colorado Regulations, 2 CCR 404-1, February 2013. Regulations  
Centralized Waste Collection Facility Or CWCF

Centralized Waste Collection Facility Or CWCF

Definition(s)

Centralized Waste Collection Facility Or CWCF

A facility that meets the requirements of subsection (m)(3) of this section. Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations