What is tubing connection

Tubing coupling is a kind of oil field drilling tool, mainly used for tubing connection. It mainly solves the problem of fatigue fracture caused by stress concentration of existing coupling.
The structure of the tubing coupling is: the tubing end is connected with the inner wall of the coupling by means of conical thread, and the coupling body end is connected with the tubing by means of flat thread with the same pitch and thread. The utility model has the characteristics of relieving the stress concentration at the root of the external thread of the tubing with a single cone thread, and is not easy to produce fatigue fracture, and the connection effect is good. Effectively prevent the occurrence of oil well broken pipe string accident.
The joint is divided into tubing joint and casing joint. Commonly used steel types are J55, K55, N80, L80, P110 and so on.