Stress reducing thread form

Abstract

A thread form for a threaded connection comprising a plurality of threads, wherein at least a portion of each of the threads comprise a root having a root radius that extends from a point central to the root and having planar flanks extending from both sides thereof.

Description

technical field [0001] Embodiments disclosed herein relate to threaded structures for coupling and decoupling threaded connections. More specifically, embodiments disclosed herein relate to a threaded configuration that reduces stress and improves fatigue life of threaded connections subjected to cyclic and / or vibration loading. Background technique [0002] Threaded connections are widely used in the oil and gas industry to connect one or more devices together. These types of threaded connections are often subjected to significant vibratory forces and / or significant cyclic loading. An example includes high pressure reciprocating pumps, such as multiplex piston pumps. These types of pumps have a fluid end, including valves, plungers, bushings, and other components, that is driven by a power end that converts rotation of a drive shaft into reciprocating motion of a plunger in the fluid end. These types of pumps pump fluid into the wellbore at rates of up to 10 barrels per ...

AI Technical Summary

Problems solved by technology

In particular, the threads are stressed along a shear plane that is substantially parallel to the longitudinal axis of the threads during operation of the fluid end, which leads to fatigue and ultimately failure of the thread interface

Additionally or alternatively, the threaded interface may experience vibrational forces which may lead to loosening and premature failure of the connection

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