EAP Actuated Valve for Autonomous Downhole Flow Control
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Solution Overview
Problem
Downhole tools in oil and gas wells face challenges in achieving reliable and autonomous valve operation without the need for tethered activation tools, particularly in completion operations where selective communication between internal and external flow areas is crucial.
Innovation Solution
The development of downhole tools equipped with a main tool housing, a valve for selective communication between internal and external flow areas, and an electro-active material-based actuation mechanism that provides opening or closing forces on the valve, allowing for autonomous operation without the intervention of a tethered activation tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a tethered activation tool is used to operate the valve, then the valve operation is reliable and controllable, but the device complexity increases and autonomous operation is not achieved
Solution Approach 1:
The patent replaces the traditional mechanical tethered activation system with an electro-active polymer (EAP) based actuation system. The EAP material converts electrical signals directly into mechanical motion to open and close the valve, eliminating the need for physical tethers and complex mechanical activation mechanisms while achieving autonomous operation.
Solution Approach 2:
The valve actuation system is designed to be self-contained and autonomous, using an integrated EAP actuator that can independently respond to electrical control signals. The system includes self-contained power supply and control circuitry that enables the valve to operate without external tethered tools, making the device serve itself.
2Device complexity
If an electro-active material actuation mechanism is used, then autonomous operation is achieved and device complexity is reduced, but the reliability of valve operation may be compromised
Solution Approach 1:
The patent incorporates backup mechanisms and redundancy in the EAP actuation system to ensure reliable valve operation. The design includes features such as mechanical springs that can provide default positioning, multiple EAP actuators that can work in parallel or as backups, and control circuitry that monitors and compensates for potential failures, thereby cushioning against reliability issues.
Solution Approach 2:
The patent optimizes the EAP material properties and actuation parameters to enhance reliability. This includes selecting EAP materials with high stroke-to-thickness ratios and fast response times, optimizing the electrical signal parameters, and designing the actuation mechanism to operate within reliable parameter ranges that ensure consistent valve operation under downhole conditions.
3Adaptability or versatility
If the valve is designed for selective communication between internal and external flow areas, then the completion operation flexibility is improved, but the device complexity increases
Solution Approach 1:
The valve system is segmented into distinct functional components including the valve body, EAP actuator, control circuitry, and flow channels. This segmentation allows each component to be optimized independently for its specific function while maintaining overall system flexibility. The valve can selectively communicate between internal and external flow areas through controlled movement of the valve element.
Solution Approach 2:
The patent employs a dynamic valve design where the valve element can move between different positions to selectively open or close flow paths. The EAP actuator enables dynamic control of the valve position, allowing the system to adapt flow communication patterns in real-time based on operational requirements, thereby achieving flexibility without excessive structural complexity.
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
Enables reliable and efficient valve operation in downhole environments, enhancing the completion process by allowing for controlled fluid communication and stimulation without the need for external activation, thereby improving well production readiness.
Implementation Method 1
a valve actuation mechanism, including an electro-active material, provides at least one of an opening force or a closing force on the valve
Data Source
AI summary
A casing valve including a tool housing defining an internal channel from a wellbore annulus. A valve allows selective communication between the internal channel and the wellbore annulus, where the valve has a sliding sleeve positioned externally to the tool housing. A first piston surface for opening the valve and a second piston surface for closing the valve are attached to the sleeve and a fluid supply valve directs fluid to the first and second piston surface. An electronic controller operates the fluid control valve to direct the fluid to the first and second control valve.