Well Threaded Connection Ratchet Locking Against Break-Out Damage
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Solution Overview
Problem
Existing threaded connections for hydrocarbon well exploration and production are susceptible to damage due to forces applied during rotational make-up and break-out, particularly affecting the anti-rotation device.
Innovation Solution
The threaded connection features a robust anti-rotation device with a first anti-rotation member having a ratchet part and spring part integrally formed, eliminating connection components prone to shear stress damage, and allowing tangential movement to direct stresses away from mounting parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the anti-rotation device uses separate connection components to join the ratchet part and spring part, then the device is easier to manufacture and assemble, but the connection components are susceptible to damage from shear stresses during operational torques
Solution Approach 1:
The ratchet part and spring part are integrally formed as a single homogeneous anti-rotation member, eliminating separate connection components. This merging removes the weak points where shear stresses could cause failure, while the integral structure maintains manufacturability through processes like forging or integral machining.
2Reliability
If the first anti-rotation member is made as a single integral piece, then the resistance to damage from shear stresses is improved, but the device complexity increases due to the need for integral forming processes
Solution Approach 1:
The invention changes the manufacturing parameter from assembly of separate parts to integral forming. This single-step forming process, while requiring specific manufacturing capabilities, actually reduces overall device complexity by eliminating multiple components, fasteners, and assembly steps, resulting in a simpler homogeneous structure.
3Stability of the object's composition
If the mounting part is constrained to prevent tangential movement, then the structural stability is improved, but the mounting part becomes susceptible to shear stress damage during make-up rotation
Solution Approach 1:
The mounting part is designed to allow dynamic tangential movement during make-up rotation, transitioning from a static constrained state to a dynamic permitted state. This dynamic capability enables the mounting part to escape shear stress zones during assembly while maintaining structural stability during operational break-out torques when rotation is prevented.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the durability and resistance to damage of the anti-rotation device, providing a more reliable threaded connection that can withstand operational torques without compromising the connection's integrity.
Implementation Method 1
a spring part which allows radial movement of the first ratchet part in radial direction relative to the longitudinal axis when first ratchet teeth slide along second ratchet teeth during relative rotation between the pin and the box in the make-up rotation direction
Data Source
AI summary
Threaded connection for exploration and production of a hydrocarbon well, said threaded connection including a pin including an outer pin surface provided with an external thread, a box including an inner box surface provided with an internal thread for mating with the external thread during rotational make-up of the threaded connection, and an anti-rotation device to allow relative rotation between the pin and the box in a make-up rotation direction and prevent relative rotation between the pin and the box in an opposite break-out rotation direction, wherein the pin and the box extend along a longitudinal axis, the anti-rotation device includes a releasable mounted first anti-rotation member which is arranged in a first radial recess provided in one of the outer pin surface and the inner box surface, and a second anti-rotation member provided at the other of the outer pin surface and the inner box surface.