Single-Well Geothermal Pipe Layout With Hydraulic Separation
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Solution Overview
Problem
Existing geothermal energy systems face inefficiencies due to the need for separate wells for pumping and injection, which can lead to chemical and physical parameter differences causing well clogging and environmental issues, and require larger drilling calibers increasing costs.
Innovation Solution
A system with a main pipe in a borehole divided by a transverse seal, surrounded by a porous bed of glass beads, where the porous bed is hydraulically interrupted by a sealing material, allowing efficient thermal connection and heat exchange without hydraulic separation of water layers, using a single pipe for both extraction and injection with optimized flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wells are used for pumping and injection, then groundwater can be extracted and reinjected, but chemical and physical parameter differences cause well clogging and require larger drilling calibers increasing costs
Solution Approach 1:
The patent combines the pumping well and injection well into a single hybrid well structure. The upper section serves as an injection zone while the lower section serves as an extraction zone, eliminating the need for separate wells and reducing drilling complexity while maintaining reliable groundwater management
Solution Approach 2:
The single well is divided into distinct functional sections separated by a screenless zone with gravel pack. The upper injection section and lower extraction section are hydraulically separated by this intermediate zone, allowing each section to perform its function independently while preventing chemical reactions between mixed waters
2Ease of operation
If separate wells are used for pumping and injection, then groundwater flow can be controlled, but it requires larger drilling calibers increasing costs
Solution Approach 1:
The patent merges two separate well constructions into one hybrid well, maintaining the ability to control groundwater flow direction and rate while significantly reducing drilling costs and simplifying construction requirements
3Use of energy by moving object
If traditional geothermal probes are used, then heat can be extracted from the ground, but efficiency is limited and antifreeze must be added posing contamination risk
Solution Approach 1:
The patent changes the working fluid parameter from antifreeze mixture to pure groundwater, eliminating contamination risks while maintaining effective heat transfer capabilities through the natural thermal properties of groundwater and the enhanced heat exchange surface area provided by the screenless design
4Power
If water flows through separate pipes for inflow and outflow, then heat exchange can occur, but no transverse seal separates the upper and lower areas leading to hydraulic mixing
Solution Approach 1:
The patent introduces a gravel pack intermediate zone that acts as a hydraulic barrier between the upper injection section and lower extraction section. This intermediary layer prevents direct hydraulic connection and mixing of waters from different depths while allowing thermal energy to be transferred through the surrounding ground formation
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 configuration enables efficient geothermal energy use with reduced maintenance, lower costs, and minimized chemical reactions, achieving 5 to 10 times higher thermal performance compared to traditional systems while maintaining ecological integrity.
Implementation Method 1
The porous bed is surrounded by a porous bed of glass beads, with the porous bed being hydraulically interrupted by a sealing material at the level of the transverse seal within the main pipe
Implementation Method 2
The passage openings are designed as filter sections
Implementation Method 3
the transverse seal having an opening in which a device is arranged which triggers and/or supports a flow which conveys water from the lower part of the main pipe
Implementation Method 4
the device being connected to a preferably insulated production pipe
Implementation Method 5
wherein the insulated conveyor pipe is connected to a preferably above ground closed circuit
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a system for the exploitation of geothermal heat and for conveying and decontaminating ground water. Said system comprises a main pipe (20), arranged in a pit (10) of a well and being subdivided into an upper and a lower part by a transverse seal (21), said transverse seal having an opening in which a pump (22) is arranged which delivers water from the lower part of the main pipe. The pump is connected to a delivery pipe (30) which is connected to an overground closed circuit, said closed circuit at its other end leading to the upper part of the main pipe and the main pipe having through openings (23) towards the surroundings upstream and downstream of the transverse seal. The main pipe is surrounded by a porous bed which surrounds the hollow space of the pit around the main pipe. The porous bed is interrupted by a sealing material (12) at the level of the transverse seal so that the porous bed is hydraulically interrupted. The invention also relates to the use of said system.