Subsea Isolation Valve Mechanical Actuation
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Solution Overview
Problem
Existing remotely operated isolation valves in the oil and gas industry face challenges with hydraulic actuation systems, particularly in subsea applications where routing control lines is difficult due to the need for crush protection, limiting their effectiveness in managing pressure and facilitating quick drill string operations.
Innovation Solution
A remotely operated isolation valve system featuring a shifting tool with a tubular housing, mandrel, and engagement member that moves between extended, released, and retracted positions, utilizing a three-way hydraulic configuration and power subs with helical profiles and clutches to operate the valve efficiently, reducing the need for extensive control lines and enhancing subsea drilling capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hydraulic actuation systems with control lines are used, then the isolation valve can be operated remotely, but the control lines require crush protection and are difficult to route through subsea wellheads
Solution Approach 1:
The patent replaces the traditional hydraulic actuation system with control lines with a mechanical actuation system. The shifting tool engages with a helical profile on the mandrel, converting rotational motion into linear motion to actuate the isolation valve. This mechanical substitution eliminates the need for control lines extending to the surface, thereby reducing routing complexity and crush protection requirements while maintaining remote operation capability through drill string rotation.
2Reliability
If hydraulic actuation with multiple control lines is used, then the isolation valve can be actuated, but the system becomes more complex and harder to install in subsea environments
Solution Approach 1:
The patent extracts the hydraulic actuation system and its control lines from the isolation valve assembly. Instead, it integrates a mechanical actuation mechanism directly into the valve structure, where the shifting tool and helical profile form a self-contained actuation system. This extraction eliminates the need for external hydraulic infrastructure, reducing overall system complexity while maintaining reliable valve actuation through the mechanical engagement mechanism.
Solution Approach 2:
The isolation valve incorporates a self-contained mechanical actuation system that does not require external hydraulic control lines. The helical profile and shifting tool create a self-service actuation mechanism where the valve can be operated through rotational input from the drill string, eliminating dependence on complex external hydraulic infrastructure and simplifying installation in subsea environments.
3Reliability
If conventional isolation valves are used, then pressure isolation can be achieved, but the control line routing through subsea wellheads is difficult and requires crush protection
Solution Approach 1:
The patent replaces the hydraulic control line system with a mechanical actuation system using a shifting tool and helical profile. This substitution eliminates control lines that would be susceptible to crushing forces in subsea environments, while maintaining the reliability of pressure isolation through the same valve mechanism. The mechanical engagement through drill string rotation provides a crush-resistant actuation method.
Data Source
AI summary
A shifting tool for use in a wellbore includes a tubular housing having a bore formed therethrough; a tubular mandrel disposed in the housing and longitudinally movable relative thereto; and an engagement member moveable relative to the housing between an extended position, a released position, and a retracted position, wherein: the engagement member is movable from the retracted position to the extended position in response to movement of the mandrel relative to the housing, and the engagement member is further movable from the extended position to the released position in response to movement of the mandrel relative to the housing.