Introduction to N80  API 5ct octg casing and Tubing Borewell

N80 API 5CT octg casing and Tubing Borewell
The Oil and gas industry relies heavily on the use of casing and tubing in borewells. These essential components play a crucial role in the extraction of oil and gas from underground reservoirs. One such type of casing and tubing is the N80 API 5CT OCTG, which stands for National Institute of standards and technology (NIST) 80 American petroleum Institute (API) 5CT oil country tubular goods (OCTG). The N80 API 5CT OCTG casing and tubing are made from high-quality steel and are designed to withstand the harsh conditions encountered during drilling and production operations. These components are manufactured in accordance with the API 5CT specification, which sets the standards for the design, manufacture, and testing of casing and tubing used in the oil and gas industry. The N80 grade of steel used in the manufacturing of these casing and tubing is known for its excellent mechanical properties and high resistance to corrosion. This makes it an ideal choice for use in borewells, where the casing and tubing are exposed to corrosive fluids and high-pressure environments.
Chemical composition, Mass Fraction (%)
Grade CMnMoCrNiCuPSSi
 Typeminmaxminmaxminmaxminmaxmaxmaxmaxmaxmax
123456789101112131415
H400.03
J550.03
K550.03
N8010.030.03
N80Q0.030.03
R950.45 c1.90.030.030.45
L8010.43 a1.90.250.350.030.030.45
L809Cr0.150.30.60.91.18100.50.250.020.031
L8013Cr0.150.220.25112140.50.250.020.031
C9010.351.20.25 b0.851.50.990.020.03
T9510.351.20.25 b0.850.41.50.990.020.03
C1100.351.20.2510.41.50.990.020.03
P110e0.030 e0.030 e
Q12510.35 1.350.851.50.990.020.01
NOTE Elements shown shall be reported in product analysis.
a The carbon content for L80 may be increased up to 0.50 % maximum if the product is oil-quenched or polymer-quenched.
b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the Wall thickness is less than 17.78 mm.
c The carbon content for R95 may be increased up to 0.55 % maximum if the product is oil-quenched.
d The molybdenum content for T95 Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 17.78 mm.
e For EW Grade P110, the phosphorus content shall be 0.020 % maximum and the sulfur content 0.010 % maximum.
The N80 API 5CT OCTG casing and tubing are available in various sizes and dimensions to suit different drilling requirements. The casing is the outermost layer that is inserted into the borehole and provides structural support to the wellbore. It prevents the collapse of the wellbore and ensures the stability of the drilling operation. The tubing, on the other hand, is the innermost layer that is inserted into the casing. It serves as a conduit for the extraction of oil and gas from the reservoir to the surface. The tubing is also used for injecting fluids into the wellbore during production operations. The N80 API 5CT OCTG casing and tubing are designed to be compatible with other components of the well completion system, such as the Wellhead and the production tree. This ensures seamless integration and efficient operation of the entire system. alt-8012 In addition to their mechanical properties, the N80 API 5CT OCTG casing and tubing also undergo rigorous testing to ensure their quality and reliability. These tests include visual inspection, dimensional inspection, Hydrostatic testing, and Non-destructive testing. These tests are conducted to verify the integrity of the casing and tubing and to detect any defects or abnormalities that may affect their performance. The N80 API 5CT OCTG casing and tubing are widely used in the oil and FEP Coiled Tubing Units

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