Delayed-Opening Casing Valve Using a Dissolvable Piston Restraint
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Solution Overview
Problem
Drilling operations face challenges in controlling equipment located thousands of feet underground, limiting the control that can be provided over drilling processes.
Innovation Solution
A delayed opening fluid communication valve is designed with a piston and dissolvable seal, where the dissolvable seal restrains the piston until it dissolves under fluid pressure, allowing the piston to move and open the valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve is opened immediately upon deployment, then fluid communication with the formation is established quickly, but premature fluid loss occurs and pressure control is compromised
Solution Approach 1:
The valve is pre-configured with a dissolvable seal that will automatically degrade at a predetermined time, eliminating the need for real-time control decisions and ensuring the valve opens at the optimal moment without premature fluid loss
Solution Approach 2:
A dissolvable seal acts as an intermediary component between the piston and the valve opening mechanism, temporarily restraining the piston and then automatically degrading to allow valve opening without requiring external control intervention
2Ease of operation
If a dissolvable seal is used to delay valve opening, then precise timing control is achieved, but the device complexity increases
Solution Approach 1:
The dissolvable seal automatically degrades based on predetermined time or environmental conditions, enabling the valve to self-regulate its opening timing without requiring external control systems, sensors, or complex actuation mechanisms
Solution Approach 2:
The dissolvable seal's material properties change over time through degradation, transforming from a restraining state to a non-restraining state, which automatically triggers valve opening without requiring complex control logic
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables controlled fluid communication with the formation by delaying the opening of the valve until the dissolvable seal loses mechanical integrity, effectively managing pressure and facilitating drilling operations.
Implementation Method 1
a dissolvable component configured to restrain the piston in the first position and to dissolve when exposed to a fluid
Implementation Method 2
dissolve when exposed to a fluid to increase a lateral force on the piston
Data Source
AI summary
A casing valve, comprising a first component configured to connect to a casing string, a second component configured to connect to the casing string, a mandrel disposed between the first component and the second component, the mandrel having a plurality of ports, a housing disposed outside of the mandrel, the housing having a plurality of ports, a piston disposed between the mandrel and the housing and configured to move in a first direction from a first position that forms a barrier between the ports of the mandrel and the ports of the housing to a second position that is adjacent to the ports of the mandrel and the ports of the housing and a dissolvable component configured to restrain the piston in the first position and to dissolve when exposed to a fluid to increase a lateral force on the piston.