TUBULAR CONNECTION WITH HELICALLY EXTENDING TORQUE SHOULDER Russian patent published in 2018 - IPC E21B17/42 F16L15/00 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to oil and gas industry. Tubular connection comprises a nipple element having a first tapered thread with a constant pitch having a cavity, a vertex, an embedded side and a supporting side, the surface of the first helical torque shoulder with a differently shaped thread across the width, arranged coaxially with the nipple element from the first tapered thread with a constant pitch, a locking member having a second tapered thread with a constant pitch having a cavity, a vertex, an embedded side and a supporting side, the surface of the second helical torque shoulder with a differently shaped thread across the width, arranged coaxial with the locking member from the second tapered thread with a constant pitch. Surface of the first helical torque shoulder with a differently shaped thread across the width is different from conical. Surface of the second helical torque shoulder is different from conical. Nipple element and the locking member are configured such that, in the position of beginning engagement, the surface of the first helical torque shoulder with a differently shaped thread across the width is not engaged or overlaps with the surface of the second helical torque shoulder with a differently shaped thread across the width.

EFFECT: technical result is higher torque resistance.

17 cl, 9 dwg