API 5CT K55/J55 SC steel oil casing and tubing

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API 5CT K55/J55 SC steel oil casing and tubing

API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.API 5CT J55 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT J55 Casing Tubing in accordance with the SY/T6194-96 standard, it is available as short thread type and long thread type supplied with their couplings.

This Standard specifies the technical delivery conditions for steel pipes (casing, tubing and pup joints), coupling stock, coupling material and accessory material and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3).
The requirements for PSL-1 are the basis of this Standard.
The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all Grades except H-40, L-80 9Cr and C110, are contained in Annex H.
Peotroleum and natureal gas industies – Steel pipes for use as casing or tubing for wells.

Products: API SPEC 5CT Seamless Steel  Tubes
Applications: It is widely used for oil casing and tubing in oil wells
Grades: J55, K55, N80, L80-1, L80-9Cr, L80-13Cr, P110, Q125, K55 D10, L80 D10.
Special Service: Sweet Service, Sour Service, Anti-H2S, NACE MR0175/ISO15156
Produce Process: Hot Rolled, Cold Drawn, Hot Expanded.
Accessories: Pup Joint, Coupling (Coupling Stock), Blast Joint, Crossover etc.

Surface treatment: Bare,Varnished, Zinc coating, Anti-corrosion,3PE,PE/PP/EP/FBE. etc.
Model number: J55,K55,N80,L80,C90,T95,P110,Q125,V150,etc
Inspection: With chemical composition and mechanical properties analysis; hydrostatic test,
dimensional and visual inspection, also with nondestructive inspection.

Connection: API connection and Premium connection, like TPCQ, HSM etc.

Dimension Tolerance

Types of steel tubesOuter DiameterWall Thickness
Cold-rolled tubesTube sizes(mm)Tolerances(mm)Tolerances(mm)
<114.3±0.79-12.5%
≥114.3-0.5%,+1%

Chemical Composition

StandardGradeChemical compositions(%)
API SPEC 5CTJ55CSiMnPSCrNiCuMoV
K550.34~0.390.20~0.351.25~1.50≤0.020≤0.015≤0.15≤0.20≤0.20//
N800.34~0.380.20~0.351.45~1.70≤0.020≤0.015≤0.15///0.11~0.16
L800.15~0.22≤1.000.25~1.00≤0.020≤0.01012.0~14.0≤0.20≤0.20//
P1100.26~0.3950.17~0.370.40~0.70≤0.020≤0.0100.80~1.10≤0.20≤0.200.15~0.25≤0.08

Mechanical propertiesc

GradeTypeTotal elongation under load (%)Yield strength (min)Yield strength (max)Tensile strength min MpaHardness

Max

(HRC)

Hardness

Max

(HBW)

J550.5379552517
K550.5379552655
N8010.5552758689
N80Q0.5552758689
L8010.555265565523241
L809Cr0.555265565523241
L8013Cr0.555265565523241
C900.562172468925.4255
C950.5655758724
T950.565575872425.4255
P1100.6758965862
Q125All0.658621034931

Oil casing is used to support the oil, gas wells of steel pipe, in order to ensure the drilling process and the completion of the entire well after the normal operation. Each well has several layers of casing depending on the drilling depth and geology. Casing down to use cement cementing, it and the tubing, drill pipe is different, can not be reused, a one-time consumption of materials. Therefore, the casing of the total consumption of more than 70% of the wells. Casing according to the use can be divided into: catheter, surface casing, casing technology and oil casining

API 5CT oil casing used in oil well drilling, which is mainly used for drilling and completion of the right wall of the support, to ensure that the conduct and completion of the drilling process after the normal operation of the wells. Casing is to maintain the wells run lifeline.

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