The casing pipe
coupling is a kind of oilfield drilling tool, which is mainly used for the connection of the oil pipe, and mainly solves the problem that the existing coupling easily generates fatigue fracture due to stress concentration.
The tubing coupling structure is: the tubing end is connected to the inner wall of the coupling by a taper thread, and the end of the coupling body and the oil pipe are connected by the same thread with the pitch flat thread. The utility model has the characteristics of alleviating the stress concentration of the root of the external thread of the single taper thread connection tubing, is not easy to produce fatigue fracture, and has good connection effect. Effectively prevent oil well pipe string breakage accidents.
The coupling is divided into a tubing coupling and a casing coupling. Commonly used steel grades are J55, K55, N80, L80, P110 and so on.
Main buckle type: NU (not thickened), EU (thickened), TBG (not thickened), UP-TBG (thickened) special buckle, etc. We can process various specifications, various lengths and various material couplings according to customer's request order drawings.
Coupling material: J55, K55, N80, L80, C-90, C95, T95, P110, P110S, stainless steel
Executive Standard: API-5CT API-5L