Piezoelectric Downhole Power Generator for Temperature Extremes
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Solution Overview
Problem
Downhole fluid driven generators and batteries face reliability issues at high and low temperatures, affecting power generation in drilling environments.
Innovation Solution
A downhole generator utilizing piezoelectric assemblies integrated into a tubular body within the drill string, where rotation-induced compression and cyclical stresses generate voltage across piezoelectric elements, converting mechanical energy into electrical power through a rectifier and storage system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If downhole fluid driven generators are used to supply electrical power, then power generation capability is improved, but reliability deteriorates due to susceptibility to temperature extremes
Solution Approach 1:
The patent replaces fluid-driven mechanical generators with piezoelectric assemblies that convert mechanical stress directly into electrical energy. The piezoelectric elements are positioned to receive compressive forces from drill string rotation, eliminating the need for fluid-driven rotating machinery and its associated reliability issues in extreme temperatures.
Solution Approach 2:
The invention changes the operating parameters from fluid flow-dependent mechanical generation to stress-dependent piezoelectric generation. By positioning piezoelectric assemblies to receive compressive forces during drill string rotation, the system adapts to varying drilling conditions while maintaining reliable power generation across temperature extremes.
2Quantity of substance
If downhole batteries are used to supply electrical power, then power storage capability is improved, but reliability deteriorates at high and low temperatures
Solution Approach 1:
The piezoelectric assemblies continuously generate electrical energy during drill string rotation to recharge batteries in advance, ensuring power availability is maintained regardless of temperature conditions. This preliminary energy generation prevents battery depletion before critical operations occur.
Solution Approach 2:
The system uses the drill string's own rotational motion during normal drilling operations to generate electrical energy through piezoelectric assemblies, which automatically charges the batteries. This self-service mechanism eliminates dependency on external power sources or complex temperature management systems.
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
Provides reliable and efficient electrical power generation, capable of charging batteries and powering downhole devices, with the ability to adapt to varying drilling conditions and temperatures.
Implementation Method 1
A downhole generator utilizing piezoelectric assemblies integrated into a tubular body within the drill string, where rotation-induced compression and cyclical stresses generate voltage across piezoelectric elements, converting mechanical energy into electrical power
Data Source
AI summary
A downhole power generator has a substantially tubular body. A cover surrounds at least a portion of the body. At least one piezoelectric element is disposed in a cavity in the body, the piezoelectric element acting cooperatively with the cover such that motion of the cover relative to the body causes the piezoelectric element to generate electric power. A method for generating power downhole comprises disposing a cover around at least a portion of a substantially tubular body; disposing at least one piezoelectric element in the body; and engaging the piezoelectric element with the cover such that motion of the cover relative to the body causes the piezoelectric element to generate electric power.