Pipe used in wells to conduct fluid from the well’s producing formation into the subsea or surface tree.

Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards


See 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



Pipe installed in the wellbore inside the production casing, extending from the wellhead to a depth at or above the completion interval, and through which formation fluids are transported to the surface and through which stimulation or injection fluids are transported to the formation.

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



Pipe placed within a well and serving as a conduit for produced well fluids or to inject fluids.

Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards



“Tubing” means a small diameter pipe that is run into a well to serve as a conduit for the passage of oil or gas to the surface. [Mich. Admin. Code R 408 (2013)].

Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations



Pipe placed in a well to produce or inject fluids.

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

Source: API SPEC 5CT, Specification for Casing and Tubing, Upstream Segment, Ninth Edition, July 2011 (Errata September 2012). Global Standards



Retrievable pipe placed within a well to conduct fluid from the well’s producing formation into the christmas tree or to conduct kill or treatment fluids in a well. NOTE Tubing is distinguished from casing as being retrievable during the life of the well.

Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards



Pipe placed within a well to serve as a production or injection conduit.

Source: API SPEC 11D1, Packers and Bridge Plugs, Upstream Segment, Second Edition, July 2009. Global Standards


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