Downhole Ball Valve Sleeve for Backpressure and Tool Access
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Solution Overview
Problem
Backpressure valves in oil and gas wells can restrict access to subjacent downhole tools, making mechanical actuation difficult due to their design, which prevents reverse fluid flow but hinders access from the surface.
Innovation Solution
A downhole valve with a sleeve and retaining element, featuring a radially-oriented opening that prevents fluid flow in one direction while allowing actuation of subjacent tools through a smaller obstructing member that can pass through the valve when the primary obstructing member is moved away from the seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backpressure valve is used to prevent reverse fluid flow, then fluid flow control is improved, but mechanical actuation of subjacent tools becomes difficult
Solution Approach 1:
The valve assembly is segmented into multiple functional components: a first obstructing member (ball) for fluid flow control, and a second obstructing member for mechanical actuation. These segments operate independently - the ball handles fluid direction while the second member provides access for actuating subjacent tools, resolving the contradiction between flow control reliability and operational ease
Solution Approach 2:
The sleeve acts as an intermediary structure that contains both obstructing members and mediates between the fluid flow function and the mechanical actuation function. It allows the ball to move for flow control while providing a passage for the second obstructing member to reach subjacent tools, thus resolving the access restriction problem
2Reliability
If the valve element restricts access to maintain sealing, then fluid flow prevention is improved, but access to subjacent tools deteriorates
Solution Approach 1:
The obstructing function is segmented into two separate members: the first obstructing member (ball) maintains sealing by engaging the seat, while the second obstructing member is specifically designed to pass through the sleeve and actuate subjacent tools. This segmentation allows both sealing reliability and tool accessibility to be maintained simultaneously
Solution Approach 2:
The solution transitions from a single-dimensional blocking approach to a multi-dimensional approach by introducing radial passages through the sleeve. The second obstructing member travels through a different spatial path (radial dimension) compared to the ball's axial movement, enabling tool actuation without compromising the sealing function
Data Source
AI summary
A downhole valve includes a housing, and a sleeve positioned within the housing. The sleeve has a first axial end, a second axial end, and a seat positioned between the first and second ends. The sleeve defines an opening facing in a radial direction. The sleeve prevents fluid flow in an opposite radial direction, away from the opening. The valve also includes a retaining element coupled to or integral with the sleeve, and a first obstructing member positioned in the sleeve and movable between the seat and the retaining element. In a first position, the first obstructing member engages the seat and prevents fluid flow through the housing. In a second position, the first obstructing member is separated apart from the seat such that at least a portion of the opening is axially between the first obstructing member and the first obstructing member.