Autonomous Downhole Power Generation with Intermittent Mode Switching
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Solution Overview
Problem
Downhole power generation devices face short operating life due to excessive stress and wear from continuous operation, and they often generate more power than needed, leading to inefficient utility and difficult maintenance.
Innovation Solution
An autonomous downhole power generation system with a power generation device switchable between power generation and bypass modes, coupled with a control processor that manages power storage and switches between modes based on stored power levels or preprogrammed protocols to optimize power usage and reduce wear on the power generation mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power generation device operates continuously to generate sufficient power for the downhole assembly, then the power demand is met, but the operating life of the device becomes short due to excessive stress and wear
Solution Approach 1:
The power generation device operates intermittently rather than continuously. The control system activates the power generation mechanism only when the stored power level falls below a threshold, creating periodic operation cycles that reduce cumulative wear while ensuring power availability when needed.
Solution Approach 2:
Power is generated and stored in advance before it is needed. The system accumulates energy in the power storage device during periods when power demand is low, preparing sufficient power reserves ahead of time to meet future demands without requiring continuous generation operation.
2Power
If the power generation device generates excess power beyond what is needed for the downhole assembly, then sufficient power is available, but the stress and wear on the mechanism increases without translating into increased utility
Solution Approach 1:
The control system continuously monitors the stored power level and compares it against a threshold value. This feedback mechanism enables the system to adjust its operation dynamically, activating power generation only when necessary and avoiding unnecessary operation that would create excess power and unnecessary wear.
3Power
If the power generation device operates continuously, then power is always available, but maintenance becomes extremely difficult and often impossible due to the harsh downhole environment
Solution Approach 1:
By operating intermittently rather than continuously, the system reduces the total operational time and exposure to harsh conditions, thereby extending the interval between maintenance requirements and reducing the frequency of difficult maintenance operations in the inaccessible downhole environment.
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 system extends the life of the power generation mechanism by only generating power when needed, reducing unnecessary wear and improving overall utility by using stored power efficiently.
Implementation Method 1
Some of the devices may be designed to use mechanical power from the fluid flow to generate electric power downhole
Implementation Method 2
a power storage device electrically coupled to the power generation device and configured to store power generated by the power generation device
Data Source
AI summary
An autonomous downhole power generation system includes a power generation device configured to be disposed in an annular space around a portion of a production tubing. The power generation device is switchable between a power generation mode and a bypass mode. The system further includes a power storage device electrically coupled to the power generation device and configured to store power generated by the power generation device, and a control processor communicatively coupled to the power generation device. The control processor switches the power generation device between the power generation mode and the bypass mode based on a preprogrammed operational protocol.