Tubing is pipe used for the transportation of crude oil and natural gas from an oil or gas layer to the surface after drilling is complete. It is made to withstand the pressure generated from the extraction process. Tubing is manufactured in the same way as casing, except that an additional process known as “upsetting” is applied to thicken the pipes.
N80-Q is different from N80-1 in heat treatment and the color of the coupling.
N80-Q needs to be given normalizing and tempering ( or quenching and annealing) in order to meet the requirements in API 5CT . But it is not neccessary for N80-1.
The coupling of N80-Q is painted with red green colors.
The coupling of N80-1 is painted with whole red color.
Therefore, it is very easy to tell of the N80-Q from N80-1 from the couplings.
Standard: API 5CT
Material: H40, J55, K55, N80, L80, P110, Q125.
Threads: LTC ( Long Round Thread), STC ( Short Round Thread), BTC ( Buttress Thread)
Length:R1(4.88-7.62m), R2(7.62-10.36m), R3(10.36-14.63m))