Ball Valve Debris Shield for Low-Force Actuation
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Solution Overview
Problem
Isolation valves fail to operate reliably in debris-laden environments due to increased friction caused by foreign material accumulation, requiring excessive force to open or close, which can exceed equipment ratings.
Innovation Solution
A debris shield mechanism is integrated into the isolation valve design, featuring a stationary debris sleeve with beveled surfaces that redirects debris inward and upward within the extension mandrel, reducing friction by preventing debris from entering the annulus and using beveled surfaces to move debris away from the ball valve during actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the ball valve operates in debris-laden environments, then the valve can function in unclean conditions, but debris accumulates on the ball valve creating a debris plug that increases friction force and requires excessive actuation force
Solution Approach 1:
The mandrel is divided into multiple sections: a first mandrel section that rotates with the ball valve and a second mandrel section that remains stationary. The debris shield is positioned between these sections to prevent debris from entering the annulus, thereby segmenting the debris flow path and reducing friction on the rotating components.
Solution Approach 2:
A debris shield is introduced as an intermediary component between the ball valve and the debris-laden environment. This shield prevents direct contact between debris and the ball valve assembly, acting as a mediator that protects the critical rotating components while allowing the valve to operate in unclean conditions.
2Ease of operation
If traditional mandrels push debris down when opening the ball valve, then the ball valve can be actuated, but this increases friction force between the mandrel and debris plug
Solution Approach 1:
Instead of pushing debris downward as in traditional designs, the stationary second mandrel section allows debris to accumulate above it without interfering with the rotation of the ball valve. The debris shield further prevents debris from entering the annulus between mandrel sections, inverting the traditional approach by preventing rather than forcing debris movement.
Solution Approach 2:
The debris shield extracts or removes debris from the critical rotation path by preventing it from entering the annulus between the first and second mandrel sections. This separation ensures that debris remains outside the friction zone, allowing smooth actuation without the need to push debris along with the mandrel.
3Adaptability or versatility
If debris enters the annulus between the extension sleeve and housing, then debris can accumulate in the actuation mechanism, but this increases friction and hinders valve operation
Solution Approach 1:
The debris shield serves as an intermediary barrier that prevents debris from entering the annulus between the extension sleeve and housing. By blocking the debris path at this critical interface, the shield protects the actuation mechanism from contamination while allowing the valve to maintain reliable operation in debris-laden environments.
Solution Approach 2:
The annulus is segmented into a protected region (inside the debris shield) and an unprotected region (outside the shield). This segmentation isolates the critical actuation components from debris, allowing the valve to operate reliably even when surrounded by debris-laden environments.
Data Source
AI summary
An isolation valve system includes a well string having an isolation valve including a rotatable ball for rotation about a fixed axis. The isolation valve has an extension mandrel and a connecting mandrel disposed above the rotatable ball. The isolation valve has a debris sleeve designed to push debris inward and upward in the extension mandrel accumulated above the rotatable ball when the ball is rotated to alleviate the friction force of the debris acting on the rotating ball.