SEALED THREADED JOINT FOR METAL PIPES
The invention relates to the field of sealed threaded joints for metal pipes in the oil and gas industry. A joint is formed by threaded end portions, having an internal and an external conical buttress thread, of two coaxially arranged pipes, and by contiguous sealing and thrust surfaces. The sealing surface of a female pipe is conical, and the sealing surface of a male pipe is toroidal. The thrust surfaces of the pipes are conical with a negative taper angle. The male pipe is provided with an additional cylindrical surface, which interfaces with the toroidal sealing surface and with the threaded end portion. The male pipe is provided with an additional conical surface, which interfaces with the toroidal sealing surface and, at the opposite end, with the conical thrust surface. The female pipe is provided with an internal annular groove, situated between the threaded end portion and the conical sealing surface. The technical result is improved tightness of the joint.