Removable Collet Lugs Restore Downhole Snap Force
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Solution Overview
Problem
Collets used in downhole operations experience a decrease in snap force due to marring, damage, and wear over long durations of use, leading to reduced effectiveness in holding and releasing tools within wellbores.
Innovation Solution
The collet design features removably coupled lugs that can be replaced, rehabilitated, or repositioned to restore or increase the snap force, utilizing reversible mechanical attachment means such as mechanical fasteners, shrink fits, adhesives, or welding, and incorporating grooves for secure attachment and easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the collet is used for long durations with repeated axial engagements and disengagements, then the collet completes its holding and releasing operations, but the snap force decreases due to marring, damage, and wear of the collet lugs
Solution Approach 1:
The collet is divided into separable components: the collet body with collet fingers and removable collet lugs. This segmentation allows the lugs to be independently replaced when worn, while the main collet body remains intact and continues to function.
Solution Approach 2:
The worn collet lugs are removed and replaced with new or rehabilitated lugs. The used lugs can be rehabilitated through processes such as hardfacing to restore their snap force, extending their service life before replacement.
2Reliability
If the collet lugs are replaced or rehabilitated, then the snap force is restored, but the device complexity increases due to removable attachment mechanisms
Solution Approach 1:
The attachment mechanism transitions from a fixed state to a dynamic removable state. The collet lugs can be attached and detached through reversible mechanical means, allowing flexible maintenance while operating as a fixed component during normal use.
Solution Approach 2:
The collet lugs are extracted as separate replaceable components from the main collet body. This extraction allows the lugs to be independently removed, replaced, or rehabilitated without affecting the structural integrity of the collet body.
3Duration of action of stationary object
If the collet lugs are made removable and replaceable, then the usability is extended, but the ease of operation decreases due to additional assembly and disassembly steps
Solution Approach 1:
The collet system is designed to be self-maintaining through simple user-performed replacement of worn lugs. The reversible attachment mechanism enables operators to restore snap force without requiring specialized tools or complex procedures, making the maintenance process accessible to field personnel.
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 approach allows for the restoration of the collet's snap force to its original value, extending its usability by enabling the replacement or rehabilitation of worn-out lugs with new or hard-faced ones, thereby maintaining operational efficiency.
Implementation Method 1
a deflective structure constructed to deflect radially outwardly or radially inwardly, and resiliently return to an initial position
Implementation Method 2
reversible mechanical attachment means such as mechanical fasteners
Data Source
AI summary
A collet includes a cylindrical body, and a plurality of longitudinally-extending orifices defined through the body and thereby providing one or more axially-extending collet fingers. A collet lug is removably coupled to each axially-extending collet finger.