OCTG Casing
Product: OCTG Casing,OCTG Casing and Tubing Pipes
Thread types: STC, LTC, BTC, premium connection.
Specification: OD: 114.3-508mm. WT: 5.21-16.13mm. L.:Range 1(4.88~7.62), Range 2(7.62~10.36), Range 3(10.36~14.63)
Standards: API Spec 5CT, ISO13680
Grade: J55, K55, N80-1,N80-Q, L80-1, L80-9Cr,L80-13Cr,C95, P110.
Uses: Well Casing serves as well sidewall.
Packing: Standard Export Package
What is OCTG Casing?
OCTG casing is used for lining the borehole which has been dug into the ground for procuring oil or gas and stabilizing it. An OCTG casing is subject to axial tensions and high internal pressures which are generated while pumping oil or gas. Similar to the drill pipe, the oil well OCTG casing is also subjected to axial tension, therefore they are required to be made from high-quality strong steel material. They also have to bear the external pressures arising from the surrounding rocks underground.
OCTG casing is a large diameter pipe that needs to be cemented into the borehole. The diameters of OCTG casing range from 4.5″ to 20″. Bestar Steel has much experience in supplying OCTG casing, which will be the best rate and internationally certificated quality. OCTG casing is a large diameter pipe that is held in place in the borehole using cement. The pipe is well-cemented and stands strong, it acts as the structural component of the well and offers hole integrity. The OCTG casing prevents the well from collapsing when the drilling process is on. Well-cemented casing should last the life of the well.
Chemical Composition of OCTG Casing
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Chemical Composition of OCTG Casing |
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Standard |
Grade |
Chemical compositions（％） |
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|
API SPEC 5CT |
J55 |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Cu |
Mo |
V |
|
K55 |
0.34～0.39 |
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 |
|
