THREADED CONNECTION OF OILFIELD CASING AND TUBING GOODS WITH HIGH RESISTANCE TO COMPRESSION AND COMBINED LOADS (OPTIONS) Russian patent published in 2019 - IPC F16L15/00 E21B17/00 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oilfield casing and tubing goods with threaded connections, configured for mounting a wellbore wall of a drilled well. Threaded connection of casing and oil-well tubing has a threaded part, as well as a metal-to-metal sealing unit structure, which is a combination of sealing elements providing 100 % efficiency of compression and tension of the connection, including under action of internal and external pressure on the medium, which is ensured by meeting the requirements of the dimensional ratio of sphere-cone seal, in which the radial sealing surface is made with two successively located toroidal surfaces, which, upon axial contact of the shoulders, form with the counter sealing surface of the female element two seals maintaining airtightness at any combination of loads.

EFFECT: improved reliability of a threaded connection of pipes under the action of static and variable operating loads, including external pressure, compression, torsion and combined loads in bending and rotation of a pipe string, wherein pipes can be used in the construction of wells with a curvature intensity of up to 13°/10 m.

11 cl, 9 dwg