These specialty joints obtain their improved properties through the following:. Many operators commonly use these proprietary connections in critical wells. API organized these tubing grades into three groups. Group 1 is for all tubing in grades H40, J55, and N Because of the nature of the manufacturing, the cross section of the tubing wall area may be slightly eccentric and the tubing slightly oval and not perfectly straight.
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API organized these tubing grades into three groups.
API Specification 5CT, 10th Edition
Before ordering or using a specific proprietary tubing connection in a critical well, the suitability of such a connection for a particular application must be assessed by either a review of service history or a comprehensive connection test program such as ISO Use this section to list papers in OnePetro that a reader who wants to learn more should definitely read. The API hydrostatic test pressures specified are inspection test pressures. A complete set of tubing pups with the same connections as the tubing string typically is purchased for each well.
The small OD of integral-joint tubing permits its use inside larger tubing strings or in wells as unloading or vent strings. Group 2 is for restricted-yield tubing grades L80, C90, and T For tubing used in sour wells wells with H 2 S content greater than 0. Range 2 is normally used. The API grade letter designation was selected arbitrarily to provide a unique name for various steels.
At a minimum, the following requirements should be specified on the purchase order:.
It is manufactured by hot-working steel or, if necessary, by subsequently cold-finishing the hot-worked product to produce the desired shape, dimensions, and properties. They do not necessarily have any direct relationship to working pressures but should be considered when establishing design factors.
5xt differences are usually specivication if the electric-weld tubing is heat-treated by the quenched-and-tempered process, which is mandatory for API grades L80, C90, T95, and P Numbers in the grade designation indicate the minimum yield strength of the steel in thousand psi.
Care should be taken if test pressures are to be exceeded in well operations. API defines the yield strength as the tensile stress required to produce a specific total elongation per unit length on a standard test specimen. Several proprietary non-API connections are available. Various tubing grades and sizes can be tested hydrostatically to higher values as listed in API Spec.
API 5CT Specification for Casing and Tubing - Pipes and Tubes
API requires that plain-end pipe be tested only to 3, psi maximum, except by agreement between the purchaser and the manufacturer. The API external-upset-end EUE tubing connection is widely used because it is a good, serviceable connection in most wells.
Impact test temperature, heat treatment, supplementary requirements, type of thread, and plating sepcification coupling are included if applicable.
Tubing inspection and handling. API tubing specifications contain several provisions that are optional for the purchaser and other stipulations that are by agreement between the purchaser and the manufacturer.
The edges to be welded are pressed together mechanically, and the heat for welding is generated by the resistance to flow of electric current. Many operators commonly use these proprietary connections in critical wells.
API 5CT Specification for Casing and Tubing - Pipes and Tubes - PDF Drive
specitication These joints are useful when greater leak resistance or more clearance is needed than that provided by the standard API joints. Couplings usually are made of seamless tubular product of the same grade and type as the pipe.
This article discusses these standards and considerations when selecting tubing. API acknowledges two tubing length ranges: The hydrostatic test pressures are calculated from Eq.
Both seamless and electric-weld processes are acceptable for most oil and gas services, but some prefer seamless tubulars for sour service apecification the electric-weld process may result in a slightly sprcification grain structure near the weld.
The following equation is used to determine the maximum hydrostatic test pressure. Because of the nature of the manufacturing, the cross section of the tubing wall area may be slightly eccentric and the tubing slightly oval and not perfectly straight.
Group 1 is for all tubing in grades H40, J55, and N