Highly tight male threaded connection of large-diameter thin-walled electric-welded casing pipes

摘要

A threaded connection refers to the field of construction and operation of oil and gas wells for various purposes and structures both on land and on the shelf. The utility model is intended for thin-walled electric-welded casing pipes with a diameter of 406.4 mm or more, which are mainly included in the last intermediate string and conductor.;The high-tight male threaded connection of thin-walled electric-welded casing pipes of large diameter includes internal (nipple) and external (sleeve) conical mating elements on which a persistent tapered unequal thread with a taper of 1:12 is made, the thread profile has a supporting and embedded edges, and depressions and vertices of the profile made parallel to the axis of the cone, while the connection includes a sealing radial and thrust end nodes, and the thread, as well as sealing smooth conical radially mate e outer (coupling) and inner (nipple) smooth contact surfaces of the metal-metal seal are made with the same taper equal to 1:12, and the smooth contact conical sealing surface of the nipple has a length not less than the length of the end contact surface, while the thrust assembly, formed by the end contact surfaces of the nipple and the coupling, made at an angle of 15 degrees to the normal to the axis of the thread and creates a calculated axial interference when screwing the coupling and nipple with special mechanical devices.;The technical result of using this utility model is to ensure gas tightness of the developed threaded joint during the operation of a gas and oil well - gas tightness of large-diameter intermediate casing strings is ensured and the possibility of the formation of technogenic gas deposits during the commercial operation of a gas and oil field is excluded. 1 ill.