Convection-Driven Closed Well Loop for Geothermal Heat Extraction
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Solution Overview
Problem
Current geothermal systems with closed well loops neglect the impact of convection, leading to imbalanced fluid flows and inefficient heat extraction.
Innovation Solution
Employ directional drilling to create well geometries that utilize convection-driven fluid flow, with hotter fluid convecting upward and colder fluid convecting downward in lateral sections of the injection and production wells, and intersecting these sections to balance flow rates and enhance heat extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional 1D modeling is used that neglects convection, then the system design is simpler, but fluid flow balance between multilateral loops is poor and heat extraction efficiency is reduced
Solution Approach 1:
The patent changes the modeling approach from 1D to a more sophisticated model that incorporates convection parameters. This allows the system to account for convective heat transfer coefficients and fluid dynamics, enabling better prediction of heat extraction efficiency while maintaining manageable complexity through systematic parameter integration.
Solution Approach 2:
The patent implements a feedback mechanism where the model continuously evaluates fluid flow rates, temperature distributions, and heat extraction performance across multiple lateral loops. This feedback enables dynamic adjustment of operational parameters to optimize heat extraction efficiency while maintaining system simplicity through automated control.
2Ease of manufacture
If multilateral loops are drilled parallel and sloped downwards as currently preferred, then drilling is easier and construction is simpler, but convection-driven fluid flow is not utilized and flow balance is poor
Solution Approach 1:
The patent introduces asymmetric well configurations where lateral loops are positioned at different depths and orientations to optimize convective flow patterns. By creating asymmetric geometry that leverages natural convection currents, the system achieves better fluid flow balance between loops while maintaining reasonable drilling complexity through systematic design rules.
3Loss of time
If convection is neglected in the design model, then the modeling process is simpler and faster, but the system cannot balance flows between multilateral loops effectively
Solution Approach 1:
The patent performs preliminary convection analysis during the design phase to establish baseline convective flow patterns and heat transfer coefficients. This preliminary action allows the system to pre-calculate optimal operational parameters and geometry configurations, reducing the need for iterative modeling while improving flow balance accuracy from the outset.
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 proposed design balances fluid flows and maximizes thermal energy extraction by leveraging convection, improving the efficiency and performance of geothermal systems.
Implementation Method 1
The fluid flow in the at least one lateral section is driven by convection where hotter fluid convects upward along the top part of the lateral section and colder fluid convects downward along the bottom part of the lateral section
Implementation Method 2
Fluid flow in the at least one lateral section extracts thermal energy from the subterranean formation
Data Source
AI summary
A closed well loop is provided for a geothermal system. The closed well loop includes at least one well having at least one lateral section the traverses a subterranean formation. Fluid flow in the at least one lateral section extracts thermal energy from the subterranean formation. The fluid flow in the at least one lateral section is driven by convection where hotter fluid convects upward along the top part of the lateral section and colder fluid convects downward along the bottom part of the lateral section.