Oil Casing Large inventory

Minimum order quantity 5 tons

Casing Pipe 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 casing.

  Key Attributes

Tubing Pipe is the conduit through which oil and gas are brought from the producing formations to the field surface facilities for processing. Tubing must be adequately strong to resist loads and deformations associated with production and workovers. Further, tubing must be sized to support the expected rates of production of oil and gas. Clearly, tubing that is too small restricts production and subsequent economic performance of the well. Tubing that is too large, however, may have an economic impact beyond the cost of the tubing string itself, because the tubing size will influence the overall casing design of the well.

Dimension Tolerance of casing pipe


Types of steel tubes
Outer Diameter
Wall Thickness
Cold-rolled tubes
Tube sizes(mm)
Tolerances(mm)
Tolerances(mm)
＜114.3
±0.79
－12.5％
≥114.3
－0.5％，＋1％


Chemical Composition of casing pipe


StandardGradeChemical compositions（％）
API SPEC 5CT
J55
CSiMnPSCrNiCuMoV
K550.34～0.39
0.20～0.35
1.25～1.50
≤0.020
≤0.015
≤0.15
≤0.20
≤0.20
//
N80
0.34～0.38
0.20～0.35
1.45～1.70
≤0.020
≤0.015
≤0.15
///0.11～0.16
L80
0.15～0.22
≤1.00
0.25～1.00
≤0.020
≤0.010
12.0～14.0
≤0.20
≤0.20
//
P110
0.26～0.395
0.17～0.37
0.40～0.70
≤0.020
≤0.010
0.80～1.10
≤0.20
≤0.20
0.15～0.25
≤0.08



Mechanical properties of casing pipe


GradeTypeTotal elongation under load (%)
Yield strength (min)
Yield strength (max)
Tensile strength min Mpa
Hardness Max (HRC)
Hardness Max(HBW)
J55-0.5
379552517--
K55-0.5
379552655--
N8010.5
552758689--
N80Q0.5
552758689--
L8010.5
55265565523241
L80
9Cr0.5
55265565523241
L80
13Cr0.5
55265565523241
C90-0.5
62172468925.4255
C95-0.5
655758724--
T95-0.565575872425.4255
P110-0.6758965862--
Q125All0.658621034931--


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