Radioisotope Power Source for Downhole Sensor Longevity
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Solution Overview
Problem
Powering low-power electrical sensors downhole in wellbore operations presents challenges due to battery self-discharge and limited placement options for turbine generators, while fiber optic sensors are limited in sensing capabilities and require invasive processes for data transmission.
Innovation Solution
A radioisotope power source is used to provide long-lasting electrical power for sensors, enabling wireless communication through acoustic or electromagnetic signals without invasive processes, allowing for more accurate and varied data collection over extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If batteries are used to power downhole sensors, then the sensors can be powered for extended periods, but the batteries will self-discharge and require replacement
Solution Approach 1:
The patent converts the naturally occurring radioactive decay (which would otherwise be considered waste or harmful radiation) into useful electrical energy through a thermoelectric generator. The radioactive material continuously generates heat that is converted to electricity, providing long-term power without self-discharge issues that plague chemical batteries.
Solution Approach 2:
The radioisotope power source is designed to be self-sustaining, using the inherent radioactive decay of the material to continuously generate heat, which is then converted to electrical energy. The system requires no external fuel supply, recharging, or maintenance, effectively serving itself for decades.
2Duration of action of moving object
If turbine power generators are used downhole, then they can provide power for extended operations, but their placement options are limited
Solution Approach 1:
The patent replaces the complex mechanical turbine system with a solid-state radioisotope thermoelectric generator. This eliminates moving parts, mechanical complexity, and fluid requirements, allowing the power source to be placed in locations where turbines cannot operate, such as confined or sensitive downhole environments.
3Ease of operation
If fiber optic sensors are used, then they can transmit data wirelessly, but they require invasive processes for data transmission and have limited sensing capabilities
Solution Approach 1:
The patent introduces an acoustic transducer as an intermediary device that converts electrical signals from the sensor into acoustic waves that can travel through the wellbore environment to the surface. This eliminates the need for invasive fiber optic cable installations while enabling wireless data transmission.
Data Source
AI summary
A system comprising a sensor device to perform measurements in a wellbore. The system may also include a wireless transmitter to transmit a signal representing the measurements to a wired transmission system. The wired transmission system may transmit the signal to an interrogation system. A radioisotope power source may provide electrical power to the sensor system in the wellbore.