Force-Activated Thermal Battery for Wellbore Safety
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Solution Overview
Problem
Existing batteries used in wellbores degrade or catch fire due to high temperatures, posing safety concerns and limiting their use in harsh wellbore conditions, and their transportation is restricted due to instability.
Innovation Solution
A force-activated thermal battery that uses pyrotechnics or electrical signals to heat above a threshold temperature, activating an electrochemical reaction to provide power, which is resistant to thermal damage and eliminates the need for electrical initiation, thus enhancing safety and operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing batteries are used in wellbores, then they can provide power to downhole tools, but they degrade or catch fire due to high temperatures
Solution Approach 1:
The patent changes the operational parameter threshold by designing a thermal battery that remains inactive at low temperatures and only activates when the temperature exceeds a specific threshold (e.g., 100°C). This is achieved by using a solid electrolyte that transitions to a liquid state at the threshold temperature, enabling electrochemical reactions only when needed. This resolves the contradiction by making the battery inherently resistant to thermal damage through parameter-based activation control.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the battery components in an inactive state with a solid electrolyte barrier that prevents electrochemical reactions until the threshold temperature is reached. The activating device, including a piston and firing pin mechanism, is pre-configured to initiate the reaction only when thermal conditions warrant activation. This preliminary preparation ensures the battery provides power only when high temperatures are present, eliminating degradation from continuous operation.
2Reliability
If lithium batteries are used, then they can provide power, but they are unstable and costly to ship due to safety concerns
Solution Approach 1:
The patent applies preliminary action by designing the battery to be in a completely inactive state during manufacturing and transportation, with the solid electrolyte preventing any electrochemical reactions. The activation mechanism (piston, firing pin, and threshold-based liquid electrolyte transition) ensures the battery cannot accidentally activate during shipping. This resolves the transportation safety issue while maintaining power supply reliability for downhole applications.
Solution Approach 2:
The patent converts the potential harm of thermal runaway into a beneficial feature by using the high temperature condition itself as the activation trigger. The solid electrolyte remains stable at low temperatures (safe for shipping) and only transitions to liquid state when high temperatures are present, at which point the battery activates to provide power. This transforms the thermal hazard into a reliable activation mechanism.
3Temperature
If existing batteries are used in high temperature wellbores, then they can power tools, but they cannot operate reliably above 180°C
Solution Approach 1:
The patent extends the operating temperature range by using a threshold-based activation mechanism where the solid electrolyte transitions to liquid at a specific temperature (e.g., 100°C), enabling the battery to operate reliably only in high-temperature conditions. This parameter change allows the battery to remain stable at lower temperatures during shipping and storage, then activate when temperatures exceed the threshold in the wellbore environment.
Solution Approach 2:
The patent applies local quality by creating different operational states within the battery system: the solid electrolyte provides stability and safety at low temperatures, while the liquid electrolyte enables power generation at high temperatures. The piston and firing pin mechanism create localized conditions (high temperature zone) where the electrochemical reactions occur, ensuring reliable operation only where needed in the wellbore.
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 force-activated thermal battery provides a reliable and safe power source for downhole tools, resistant to high temperatures, reducing the risk of thermal damage and spurious ground paths, and allowing for safer shipping and storage, as it only activates at high temperatures, thereby avoiding electrical hazards.
Implementation Method 1
The piston can activate the thermal battery by moving to the second position. In some examples, the activating device can include a firing pin coupled to the piston, such that the firing pin can contact a primer in response to the piston moving to the second position. The primer can ignite pyrotechnics to heat the thermal battery to a temperature above the threshold temperature.
Implementation Method 2
A thermal battery can be a battery that is activated, such that the battery provides electrical power, in response to being heated to a temperature that exceeds a threshold temperature.
Implementation Method 3
In some other examples, the activating device can include a magnet coupled to the piston for generating an electrical signal by moving through a conductive coil in response to the force being applied to the piston. The electrical signal can be used to ignite the pyrotechnics.
Data Source
AI summary
A thermal battery positioned in a wellbore can be force activated by a device. The device can include a body coupled to a thermal battery positioned in a wellbore. The body can include a piston retained at a first position in an inner area of the body. The piston can move from the first position to a second position in response to a force applied to the body. The thermal battery can be activated by moving the piston to the second position.