Tag Archives: Specification for Casing and Tubing

Updated list of API and ISO Standards for Tubulars

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In this article, the last updated list of API & ISO standards for Tubulars (Casings, Tubings, Threads, Drill Pipe, Line Pipe) is presented. These standards can be considered as reference documents as well as a basis for training classes in the subject of Tubular Goods.

 

  • API RP 5A3/ISO 13678:2010 – Recommended Practice on Thread Compounds for Casing, Tubing, Line Pipe, and Drill Stem Elements (includes Errata 1 dated April 2011):

API RP 5A3 provides requirements, recommendations, and methods for the testing of thread compounds intended for use on threaded casing, tubing, and line pipe connections and for thread compounds intended for use on rotary shouldered connections. The tests outlined are used to evaluate the critical performance properties and physical and chemical characteristics of thread compounds under laboratory conditions.

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Casing Specifications

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Casing is the major structural component of a well. It is a tubular steel product used to line the wellbore (maintain borehole stability), prevent contamination of water sands, isolate water from producing formations, and control well pressures during drilling, production, and workover operations. Casing provides locations for the installation of blowout preventers, wellhead equipment, production packers, and production tubing.

The cost of casing is a major part of the overall well cost, so the selection of casing size, grade, connectors, and setting depth is a primary engineering and economic consideration.

Casing Strings:

Since the well is normally drilled in segments, multiple concentric casing strings are usually installed in the well. There are six basic types of casing strings:

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