Products:API5CT Gr.J55 casing pipe/J55 seamless casing and tubing
Standard: API5CT-American Petroleum Institute
The oil casing is a steel pipe used to support the oil and gas well wall to ensure the normal operation of the entire well after the drilling process is completed and completed. Each well is based on different depths of drilling and geology, using several layers of casing. After the casing is drilled, the cement cementing is adopted. It is different from the oil pipe and the drill pipe and cannot be reused. It is a disposable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes.
Casing can be divided into: conduit, surface casing, technical casing and oil casing.
Steel grades for oil casings: H40, J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Casing end machining form: short round thread, long round thread, Buttress thread, Premium thread, etc. It is mainly used for oil well drilling mainly for supporting the well wall during and after drilling to ensure the drilling process and the normal operation of the entire well after completion.
[(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / m (weight per meter)
(1) According to SY/T6194-96. The casing and its couplings are of the same steel grade. Sulfur content <0.045%, phosphorus content <0.045%;
(2) Take chemical analysis samples according to the provisions of GB/T222-84. Conduct chemical analysis according to the relevant provisions of GB223;
(3) American Petroleum Institute API SPEC 5CT 1988 first edition. Chemical analysis was prepared according to the latest version of ASTM E59 and chemical analysis was performed according to the latest version of ASTM E350.
(1) According to SY/T6194-96. For the flattening test (GB246-97) tensile test (GB228-87) and hydraulic test;
(2) According to the American Petroleum Institute APISPEC5CT 1988 first edition for hydrostatic pressure test, flattening test, sulfide stress corrosion cracking test, hardness test (ASTME18 or E10 latest version of the provisions), tensile test, lateral impact test ( ASTMA370, ASTME23 and the latest edition of the relevant standards are specified), grain size determination (the latest version of ASTM E112 or other methods).
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