HIGH-TORQUE SLEEVELESS THREADED CONNECTION FOR OIL AND GAS FIELD PIPES Russian patent published in 2022 - IPC F16L15/00 

FIELD: oil and gas production.

SUBSTANCE: invention relates to the field of oil and gas production, in particular to high-torque sleeveless threaded connections of oil and gas field pipes used in the construction of oil and gas wells. The connection contains nipple and socket elements, at the ends of which there are external and internal conical threads mating with it and sealing surfaces forming an internal sealing assembly. The threads of the nipple and socket elements are made with negative angles of inclination of the side faces of the coil profile, with the troughs and tops of the coil profile parallel to the axial line of the thread, with the width of the coil profile changing in opposite directions in such a way that the gaps formed at the beginning of the screwing of the joint along the side faces of the coil profile are selected until a sealing contact is formed along the side faces of the coil profile at the end of the make-up. The sealing surfaces of the internal sealing unit are made in the form of conical and convex spherical surfaces on the socket element and convex spherical and conical surfaces on the nipple element, arranged in series, starting from the side of the thread, forming two sealing zones during the screwing of the connection - “cone-sphere” and “sphere -cone".

EFFECT: invention ensures gas-tightness of the connection when exposed to high torque and bending loads.

14 cl, 3 dwg, 1 tbl