Weight Down Collet Segmentation for Indicator Coupling
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Solution Overview
Problem
Downhole tools in the oil and gas industry face issues with abrasive wear and clogging due to particulate matter, and existing weight down collets often prematurely cycle and fail when trying to locate indicator couplings within completion strings, leading to potential damage and operational inefficiencies.
Innovation Solution
A weight down collet design featuring a primary and secondary collet with snap values that prevent premature engagement with seal bores, allowing the collet to correctly locate indicator couplings and move to a fully supported position, utilizing a J-slot mechanism to ensure secure alignment and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the weight down collet enters and passes through seal bores to locate indicator couplings, then the service tool can be positioned at the desired production interval, but friction generates premature cycling and potential damage to the service tool or weight down collet
Solution Approach 1:
The weight down collet is divided into two separate collets: a primary collet for engaging seal bores and a secondary collet for engaging indicator couplings. This segmentation allows each collet to have specialized geometry optimized for its specific function, preventing premature cycling while enabling reliable location of the indicator coupling.
Solution Approach 2:
Each collet is given distinct local geometry and properties: the primary collet has features suited for seal bore engagement while the secondary collet has features for indicator coupling engagement. This local differentiation ensures that each component performs its specific function effectively without causing premature cycling.
2Adaptability or versatility
If the weight down collet is designed to engage seal bores, then it can pass through restrictions, but it may prematurely cycle to a weight down position before reaching the desired indicator coupling
Solution Approach 1:
The collet system is segmented into primary and secondary collets with distinct engagement characteristics. The primary collet can pass through seal bores while the secondary collet provides precise engagement with indicator couplings, ensuring accurate positioning without premature cycling.
Solution Approach 2:
The secondary collet acts as an intermediary mechanism that prevents the primary collet from causing premature cycling. It provides an intermediate engagement state that allows the service tool to pass through seal bores while maintaining positioning accuracy for the indicator coupling.
Data Source
AI summary
A weight down collet includes a mandrel that provides an outer diameter feature and a shoulder, and a collet sleeve assembly movably disposed about the mandrel. The collet sleeve assembly includes a body, a primary collet provided on the body and defining an upper detent and a lower detent having a gap defined therebetween, and a secondary collet provided on the body and axially spaced from the primary collet. The upper and lower detents extend radially outward from the body and are engageable with one or more restrictions provided on an inner wall of a completion string, and the secondary collet defines an inner detent that extends radially inward and is engageable with the shoulder. The collet sleeve assembly is movable between an unsupported position, where the primary collet is radially unsupported, and a supported position, where the primary collet is radially supported on the outer diameter feature.