Voltage-Controlled Expandable Metal for Downhole Anchoring and Sealing
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Solution Overview
Problem
Existing downhole tools used for isolating wellbore sections face challenges in efficiently anchoring and sealing within wellbores, particularly in open hole situations, due to surface irregularities and the need for precise control over expansion and corrosion resistance.
Innovation Solution
Utilizing expandable metal components that react to hydrolysis, with voltage control to accelerate or decelerate expansion, and incorporating electrical insulation to manage power consumption and corrosion protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If expandable metal is used to anchor downhole tools, then anchoring capability is improved, but expansion time is excessive and control precision is poor
Solution Approach 1:
The patent applies electrical voltage to change the chemical reaction parameters of the expandable metal, transforming it from a passive slow hydrolysis process to an actively controllable electrochemical expansion process. By adjusting voltage magnitude and polarity, the expansion rate can be precisely controlled to resolve the time loss issue while maintaining anchoring strength.
Solution Approach 2:
The patent replaces the natural passive mechanical expansion process with an electrochemically driven active expansion mechanism. Instead of relying solely on spontaneous hydrolysis, the system uses electrical energy to accelerate and control the metal expansion, thereby reducing expansion time and improving control precision.
2Strength
If expandable metal is subjected to wellbore fluid for expansion, then anchoring capability is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent employs periodic or controlled voltage application to the expandable metal. By applying voltage only during the expansion phase and suspending it during corrosion-prone periods, the system achieves both expansion capability and corrosion protection. The controlled electrochemical process allows selective activation of expansion while minimizing galvanic corrosion in wellbore fluids.
3Speed
If voltage is applied to accelerate expansion, then expansion speed is improved, but power consumption increases
Solution Approach 1:
The patent applies voltage at optimized levels that provide sufficient expansion acceleration without excessive energy input. By carefully selecting voltage magnitude and application duration, the system achieves the required expansion speed while minimizing power consumption. The electrochemical expansion is activated only when and where needed, avoiding continuous energy expenditure.
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
The solution provides enhanced anchoring and sealing capabilities, with accelerated expansion up to 100×, improved corrosion resistance, and efficient power management, ensuring robust wellbore isolation.
Implementation Method 1
a first expandable metal feature positioned on a downhole tubular and configured to expand in response to wellbore fluid
Implementation Method 2
applying a voltage to the expandable metal while the expandable metal is being subjected to the wellbore fluid
Data Source
AI summary
Provided is a method for setting a downhole tool, and a downhole tool, and a well system employing the same. The method, in at least one aspect, includes positioning a downhole tool within a wellbore, the downhole tool including expandable metal configured to expand in response to hydrolysis, and subjecting the expandable metal to a wellbore fluid to expand the expandable metal into contact with one or more surfaces. The method, in at least one aspect, further includes applying a voltage to the expandable metal while the expandable metal is being subjected to the wellbore fluid.