Geothermal Well Layout Using Gravity Flow and Steam Generation
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Solution Overview
Problem
Current geothermal energy systems are inefficient in harnessing energy from hot, deep underground rock formations, and there is a need for a cost-effective method to generate electricity using existing well infrastructure and fluid sources.
Innovation Solution
A system comprising three interconnected well bores: one for gravity-driven fluid flow to a hot area, another for fluid heating, and a third for steam generation, with turbines at each stage to produce electricity, utilizing existing wells and potentially CO2 for rock expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If new well bores are drilled to access hot deep areas, then energy generation capability is improved, but system cost increases
Solution Approach 1:
The patent combines multiple functions into existing well infrastructure: using the same well for fluid injection, steam extraction, and CO2 sequestration. This merging eliminates the need for separate new well bores, thereby maintaining energy generation capability while reducing system costs by reusing existing infrastructure.
Solution Approach 2:
Existing wells are designed to perform multiple functions simultaneously: serving as injection wells for cold fluid, production wells for steam extraction, and storage wells for CO2 sequestration. This multi-functionality allows the system to achieve diverse objectives through a single infrastructure, reducing the need for additional wells and associated costs.
2Volume of moving object
If CO2 is injected into limestone rock formations, then well bore size expands, but system complexity increases
Solution Approach 1:
The patent utilizes chemical parameter changes by injecting CO2 into limestone formations, where it reacts to expand the well bore volume. This parameter change (chemical reaction) naturally enlarges the well bore without requiring mechanical expansion equipment, thereby increasing volume while minimizing added system complexity.
3Ease of manufacture
If existing fracking wells are reused, then infrastructure cost is reduced, but system adaptability is constrained
Solution Approach 1:
The patent implements dynamic operation of existing fracking wells, allowing them to switch between different functions (injection, production, storage) based on operational needs. This dynamic allocation enables the system to adapt to varying energy demands and operational conditions while reusing the existing infrastructure, thus maintaining both cost efficiency and adaptability.
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
This system efficiently generates electricity by leveraging gravity-driven fluid flow and steam generation, reducing costs through reuse of existing infrastructure and potentially enhancing well bore size with CO2 reactions, while improving fracking fluid quality.
Implementation Method 1
a fluid will be passed from the surface to the hot, deep area in the first well bore or pipe substantially by gravity and in the course of doing so will cause turbines installed within that well bore or pipe to turn, thereby generating electricity
Implementation Method 2
The fluid in the second well bore or pipe will be heated by the surrounding rock until it reaches a suitable point above boiling
Implementation Method 3
When it has done so, the second valve will open, allowing the steam created by the subsurface heat to ascend to the surface through the third well bore or pipe
Data Source
AI summary
A hydroelectric and geothermal system includes a fluid communication channel that includes a first portion that extends from the earth's surface toward a subterranean hot area, a second portion connected to the first portion and in thermal communication with the subterranean hot area, and a third portion connected to the second portion and that extends to the earth's surface. A first turbine generator is configured to convert kinetic energy of a fluid flowing substantially under the influence of gravity in the first portion of the fluid communication channel into electrical energy. A second turbine generator is configured to convert kinetic energy of a vapor flowing within or out from the third portion of the fluid communication channel into electrical energy. The system also includes a valve arrangement configured for manipulation to hold the fluid in the second portion of the fluid communication channel in thermal communication with the subterranean hot area to produce the vapor.