Downhole Localized Heaters for Faster Expandable Metal Setting
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Solution Overview
Problem
Existing downhole tools used for wellbore isolation and anchoring, such as frac plugs and packers, require extended periods for the expansion of expandable metals to set properly, which can take up to 90 days depending on downhole temperatures.
Innovation Solution
The implementation of a downhole localized heater that provides a temperature spike to accelerate the expansion process of expandable metals, thereby reducing the time required for setting downhole tools from days to hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downhole tools use expandable metals for wellbore anchoring and isolation, then the tools can effectively isolate wellbore sections and function as anchors, but the setting time extends to up to 90 days depending on downhole temperatures
Solution Approach 1:
The patent applies parameter changes by introducing thermal energy to alter the temperature parameter of the expandable metal, thereby accelerating the hydrolysis reaction rate. The heater increases the temperature from typical downhole conditions (e.g., 60-120°F) to elevated temperatures (e.g., 140-200°F or higher), which exponentially increases the reaction rate and reduces setting time from 90 days to hours or days, while maintaining the reliability of anchoring and isolation functions.
Solution Approach 2:
The patent employs periodic action through the use of a heater that can be activated in stages or continuously for controlled periods. The thermal treatment can be applied intermittently or in controlled bursts, allowing the expandable metal to undergo hydrolysis at accelerated rates during heated periods while maintaining operational flexibility. This periodic thermal stimulation achieves rapid setting without requiring continuous high-energy input throughout the entire 90-day period.
2Stability of the object's composition
If downhole tools require extended setting periods for expandable metals, then the expansion can proceed under normal downhole temperature conditions, but operational efficiency decreases and downtime increases
Solution Approach 1:
The patent changes the temperature parameter of the expandable metal from normal downhole conditions to elevated temperatures using a heater. This parameter change accelerates the hydrolysis reaction and expansion process, reducing setting time from 90 days to hours or days. The controlled thermal treatment maintains expansion stability while dramatically improving operational efficiency and reducing well downtime.
Solution Approach 2:
The patent applies preliminary action by pre-heating the expandable metal or the surrounding environment before or during the expansion process. This preliminary thermal treatment prepares the expandable metal for rapid hydrolysis and expansion, ensuring stable composition changes while accelerating the overall process. The heater is positioned to provide thermal energy in advance or concurrently with the expansion, optimizing both stability and productivity.
3Loss of time
If a downhole localized heater is used to accelerate expandable metal expansion, then setting time is reduced from days to hours, but additional equipment and operational complexity are introduced
Solution Approach 1:
The patent introduces a heater as an intermediary device between the downhole environment and the expandable metal. This intermediary applies thermal energy to accelerate the hydrolysis reaction and expansion process. The heater can be electrically powered or chemically driven, and it mediates the energy transfer needed to reduce setting time from 90 days to hours, accepting the added operational complexity as a trade-off for dramatic time savings.
Solution Approach 2:
The patent replaces the purely time-dependent chemical hydrolysis process with a thermally-driven accelerated reaction. Instead of relying on slow ambient temperature hydrolysis over 90 days, the system substitutes thermal energy input to drive the same chemical transformation much faster. This substitution of the reaction driving mechanism (from passive chemical to active thermal-chemical) reduces setting time to hours while introducing heater equipment and associated operational procedures.
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 use of a downhole localized heater significantly accelerates the expansion and setting of expandable metals, allowing for quicker deployment and anchoring of downhole tools, which is crucial for efficient well operations and reduced downtime.
Implementation Method 1
The use of a downhole localized heater significantly accelerates the expansion and setting of expandable metals, allowing for quicker deployment and anchoring of downhole tools
Data Source
AI summary
Provided is a method for setting a downhole tool, and a downhole localized heater. 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 positioning a downhole localized heater within the wellbore, the downhole localized heater being proximate the expandable metal. The method additionally includes subjecting the expandable metal to a wellbore fluid to expand the expandable metal into contact with one or more surfaces while activating the downhole localized heater to create a temperature spike and accelerate an expansion of the expandable metal.