Formation Isolation Valve Ball Rotation Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing flow isolation valves in downhole applications face issues with debris clogging and complex, difficult-to-manufacture designs that lead to inefficiency and high scrap rates due to tight tolerances and dimensional instability.
Innovation Solution
A formation isolation valve design featuring a ball that rotates about a fixed axis, utilizing yoke arms or rods for actuation, with a wiper to prevent debris accumulation, and simple, strong components that are easier to manufacture and less sensitive to tolerances, allowing for reliable operation and reduced material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ball valve design with translation and rotation mechanisms is used, then the valve can be actuated, but the design becomes complex and difficult to manufacture with tight tolerances
Solution Approach 1:
The ball actuation mechanism is segmented into distinct functional components: the ball itself, the arm connected at an offset position, and the shifting tool. This segmentation allows each component to be optimized independently, simplifying manufacturing while maintaining actuation functionality.
Solution Approach 2:
Instead of allowing the ball to translate and rotate independently through complex mechanisms, the invention inverts the approach by constraining the ball to rotate only about a fixed axis. The offset arm connection converts linear motion into rotational motion, eliminating the need for complex translation mechanisms.
2Reliability
If tight tolerances and complex designs are employed to achieve rotation and translation, then the ball valve can function, but manufacturing efficiency decreases and scrap rates increase
Solution Approach 1:
The invention changes the operational parameters of the ball from requiring both translation and rotation to requiring rotation about a fixed axis only. This parameter change simplifies the manufacturing tolerances required while maintaining reliable valve function through the offset arm mechanism.
Solution Approach 2:
The simplified design with relaxed tolerances reduces manufacturing costs and scrap rates, making the valve components more economical to produce while maintaining sufficient reliability for the application.
3Ease of operation
If the ball is used as a flow isolation component, then fluid flow can be controlled, but debris accumulates on the ball creating a barrier that causes clogging
Solution Approach 1:
The harmful effect of debris accumulation is extracted and addressed separately through the addition of a wiper component. The wiper actively removes debris from the ball surface, preventing clogging while maintaining the ball's flow control function.
Solution Approach 2:
The wiper mechanism is integrated into the ball actuation system, allowing the ball to clean itself of debris during normal operation. This self-service approach maintains flow control capability while continuously preventing debris accumulation.
Data Source
AI summary
A technique employs a formation isolation valve that utilizes a ball rotatably mounted within a valve housing. The valve is designed to enable rotation of the ball about a fixed axis without translation of the ball. Rotation of the ball is achieved by connecting an arm to the ball at a position offset from the axis of rotation. A movable mandrel also is connected to the arm to enable selective actuation of the ball.