Tubing coupling structures are: tubing ends and the inner wall of the coupling connected to the tapered threads, ends with the tubing coupling body with the same thread pitch flat with threaded connect. Relieving single tapered threaded pipe connection male thread root stress concentration features, easy to produce fatigue fracture, good connection effect. Effectively prevent the oil well tubing string broken off accident.
Coupling into tubing coupling and casing couplings. Commonly used steel grade J55, K55, N80, L80, P110 and so on.
没有评论:
发表评论