Vibrating Assembly Downhole Energy Generation
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Solution Overview
Problem
Existing downhole energy generation systems for hydrocarbon wells face challenges such as short battery life due to self-discharge, insufficient energy supply for high-power operations, and vulnerability to harsh well environments, limiting the effectiveness of wireless telemetry and autonomous devices.
Innovation Solution
A vibration-based energy generation system utilizing a vibrating assembly influenced by fluid flow, with an elongated body and stiff rod connected to an energy harvester and active tuning device, optimized for vortex shedding to maximize energy harvesting, and featuring a pressure-compensated compartment and rechargeable battery pack for efficient power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If non-rechargeable batteries are used for downhole devices, then device simplicity is maintained, but battery life is short due to self-discharge and energy supply is insufficient
Solution Approach 1:
The system uses the well's own fluid flow to generate electrical energy through a vibration-based generator, making the environment itself the energy source rather than relying on batteries that lose energy through self-discharge. The fluid flow directly drives the energy generation mechanism.
Solution Approach 2:
The system exploits periodic vortex shedding from the fluid flow to create oscillations in the vibrating assembly, which in turn generates electrical energy through the energy harvester. This periodic action converts the continuous fluid flow into discrete energy-generating cycles.
2Power
If vibration-based energy generation is implemented, then energy output is increased, but device complexity increases due to additional components
Solution Approach 1:
The system combines multiple functions into a single integrated assembly: the vibrating assembly serves as both the energy generation mechanism and the structural framework, while the energy harvester is integrated within this assembly. The pressure-compensated compartment is incorporated into the overall device structure, merging pressure compensation with energy harvesting.
Solution Approach 2:
The vibrating assembly serves multiple purposes: it generates electrical energy through the energy harvester, provides structural support for other downhole device components, and utilizes the fluid flow directly. This multi-functionality reduces the need for separate dedicated components.
3Productivity
If downhole devices operate in harsh well environments, then production capability is maintained, but reliability decreases due to vulnerability to hostile conditions
Solution Approach 1:
The system incorporates a pressure-compensated compartment that protects sensitive electronic components from the harsh well environment. This compartment is designed to maintain stable internal pressure and conditions, cushioning the electronics against external pressure variations and hostile conditions before they can cause damage.
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 provides extended battery life, increased energy output, and enhanced reliability for autonomous downhole devices, enabling prolonged operation and improved functionality in hostile well environments.
Implementation Method 1
A vibration-based energy generation system utilizing a vibrating assembly influenced by fluid flow, with an elongated body and stiff rod connected to an energy harvester and active tuning device, optimized for vortex shedding to maximize energy harvesting
Data Source
AI summary
A downhole electrical energy generating device and a method for transforming energy from a fluid flow passing the device are described. A vibrating assembly is influenced by the fluid flow to oscillate, the vibrating assembly including an elongated body having a longitudinal axis being arranged non-parallel with the fluid flow, a stiff body connecting the elongated body to a portion of the device located downstream of said elongated body; at least one energy harvester influenced by the vibrating assembly, wherein the energy generating device is provided with means for influencing the oscillation frequency of the vibrating assembly.