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.
1.Specification range:OD: 42.16 MM - 114.3 MM(1.66"--4 1/2") WT:3.56-16mm(2.3ppf-26.1ppf)
2. Materials: H40, J55, K55, N80-1, N80-Q, L80-1,L80-9Cr, L80-13Cr, P110, Q125 etc
3. Executive standards: API 5CT, GB, ISO11960, GOST
4. Thread connection: NU, EU，IJ
5. Length: R1, R2, R3
6. Testing: NDT etc related rules of API 5CT and 5B