Threaded and coupled casing joint, resistant to SSC (hydrogen sulfide stress corrosion cracking)

摘要

The invention relates to the field of construction and subsequent maintenance of oil and gas wells, the produced fluid containing hydrogen sulfide. This utility model is directed to solving the technical problem to reduce the magnitude of tensile stresses below the threshold in the elements of the threaded joint due to changes in the actual design parameters of the threaded joint, the structural elements of the thread of the pin and the box and sealing elements. The technical result is achieved in that the threaded screw connection casing resistant SSC, includes a clutch and a pin interconnecting the conical trapezoidal threads (inner and outer respectively) with a conicity of 1:16, a seal assembly adapted to the small diameter side of the cone clutch and pin formed by the conical and radial end surfaces, the taper of the end sealing surfaces configured α≤6 ° angle to the perpendicular axis of the thread, the taper thread is konusnos five radial sealing surfaces and is 1:16, and the transition from the thread surface to surface sealing groove formed tappings inverse taper in the range of 1 ° ÷ 3 ° to the thread axis, while in the traditional trapezoidal thread type "Batress can be used as a conical trapezoidal thread "with the thread angle 13 ° or upgraded thread" Batress "reduced by 0.2 mm on the profile of the pin turns a full thread profile.