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Oil pipe

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  • Oil pipe
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Oil pipe
Oil Country Tubular Goods (OCTG) is the collective term for the steel tubular products used in oil and gas well construction and production. Under API Spec 5CT, OCTG is primarily divided into casing and tubing—two distinct product families serving different functions downhole.
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Product Description
ParameterCasingTubing
StandardAPI Spec 5CT / ISO 11960API Spec 5CT / ISO 11960
Outside Diameter4½″ – 20″ (114.3 – 508 mm)1.050″ – 5½″ (26.7 – 139.7 mm)
Wall ThicknessTypically 5.21 – 16.13 mm (varies by size & weight)Typically 2.87 – 9.52 mm (varies by size & weight)
Length RangeRange 2 & Range 3Range 2 (commonly R2)
Steel GradesH40, J55, K55, N80-1/N80Q, L80, C90, T95, P110, Q125; 13Cr availableH40, J55, K55, N80, L80, C90, T95, P110, Q125
Sour Service GradesL80, C90, T95 (controlled hardness, SSC-resistant)L80, C90, T95
End Finish / ConnectionSTC, LTC, BTC, Premium gas-tightNUE, EUE, Premium gas-tight
Product Specification LevelPSL1 / PSL2PSL1 / PSL2
Manufacturing RouteSeamless / ERWSeamless / ERW
Inspection & TestingHydrostatic test per API 5CT; NDT (UT) after hydrotest; drift testHydrostatic test; NDT; drift test
Typical Export FormBlack bare / coated; with couplings; 6–18 m jointsBlack bare / coated; with couplings; R2 joints


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