Continuous resin-rich coating on the inside surface of a pipe or fitting component, used to protect the laminate from chemical attack or to prevent leakage under stress.

  • Note: 1 to entry: The liner can also be used to provide enhanced abrasion and erosion resistance.

Source: ISO 14692-1:2017, Petroleum and natural gas industries — Glass-reinforced plastics (GRP) piping — Part 1: Vocabulary, symbols, applications and materials, Second Edition, August 2017. Global Standards



“Liner” means a continuous, low-permeability layer constructed of natural or human-made materials that restricts the migration of liquid oil field wastes, gases or leachate.

Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations



“Liner” means a length of casing used downhole as an extension to a previously installed casing string to case the hole for further drilling operations and/or for producing operations.

Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. Regulations



“Liner” means a string of casing set and cemented which does not extend to surface. Liners are anchored or suspended inside the previous casing string and may serve the purpose of intermediate or production casing strings.

Source: Division of Mineral Resources Management – Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations



A liner is a casing string that does not extend to the top of the well or to the wellhead. Liners are anchored or suspended from inside the previous casing string using a liner hanger. The liner can be fitted with special components so that it can be connected or tied back to the surface at a later time.

Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards



Pipe that does not extend from the surface and is 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



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


A string of casing which does not extend to the surface but is hung from inside the previous casing string and is cemented in place. The overlap of the liner could vary from 50 ft to 500 ft depending on the purpose of the liner. Production liners are set to the top of, or through, the completion interval. Drilling liners are set primarily to case off and isolate zones of lost circulation, highly overpressured zones, and sloughing shales, so drilling may proceed. Repair liners are used to isolate casing leaks and to repair damaged, worn, corroded, or deliberately perforated casing. A large number of wells are drilled without running liners.

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

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