Multiple Well Pair Geothermal Systems for Scalable Power Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional geothermal energy extraction is limited by geographical bias towards volcanic regions, inefficient designs, and short-lived systems due to low thermal diffusivity of rock, restricting power generation capacity to around 20 megawatts, which is insufficient for modern energy demands.
Innovation Solution
The implementation of multiple underground lateral well pairs in hot sedimentary aquifers, creating a large-scale convective flow field through dipole pressure gradients, allowing for the simultaneous pumping of hot water from extraction wells and re-injection of cooled water, enhancing heat harvesting over a wider area and longer duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional single well pair design is used, then system simplicity is maintained, but power generation capacity is limited to around 20 megawatts
Solution Approach 1:
The system divides the geothermal energy extraction into multiple independent well pairs (first well pair, second well pair, third well pair, etc.), each consisting of an injection well and an extraction well. This segmentation allows the total power generation capacity to be scaled by adding more segments (well pairs) while maintaining the simplicity of individual well pair design. Each well pair operates semi-independently to contribute to the overall power output.
Solution Approach 2:
Multiple well pairs are merged into a single integrated geothermal power system that shares common infrastructure including the power generation facility, fluid distribution network, and control systems. This merging allows the individual 20 megawatt-capable well pairs to work together to achieve much higher total power generation capacity (25 to 500 megawatts) while benefiting from shared infrastructure efficiencies.
2Temperature
If geothermal facilities are located in volcanic regions, then high temperature and energy accessibility are achieved, but geographical limitations restrict widespread deployment
Solution Approach 1:
The geothermal system is designed to function universally across different geological settings by using multiple well pairs that can be configured to extract heat from various subsurface formations. The system can adapt to different temperature gradients, rock types, and aquifer conditions by adjusting well depth, spacing, and configuration, making it applicable beyond just volcanic regions to sedimentary basins and other geothermal resources worldwide.
Solution Approach 2:
The system adjusts key parameters including well depth, well spacing, injection rate, and extraction rate to optimize performance for different geographical and geological conditions. By changing these parameters, the same basic multiple well pair configuration can be adapted to extract heat efficiently from various subsurface environments, from shallow sedimentary aquifers to deeper crystalline rock formations.
3Duration of action of stationary object
If traditional geothermal extraction methods are used, then initial energy harvesting is achieved, but system lifespan is short due to low thermal diffusivity of rock
Solution Approach 1:
The system maintains continuous useful action by constantly circulating fluid through the multiple well pairs, continuously extracting heat from the subsurface formations. The coordinated operation of multiple injection and extraction wells ensures uninterrupted heat transfer and energy generation, maximizing the productive lifespan of the geothermal system by preventing thermal shutdown that occurs in single well pair systems.
Solution Approach 2:
By segmenting the heat extraction across multiple well pairs distributed over a larger subsurface volume, the system accesses a much larger thermal reservoir. This segmentation prevents rapid depletion of heat in any single location, as each well pair draws from a different portion of the thermal field, thereby extending the overall system lifespan and reducing the rate of thermal energy loss.
4Area of stationary object
If single well pair configuration is used, then system simplicity is maintained, but heat harvesting area and duration are limited
Solution Approach 1:
The heat harvesting area is segmented into multiple zones, each served by a separate well pair. This segmentation allows the system to cover a much larger total area (hectares to square kilometers scale) by distributing multiple injection-extraction well pairs across the geothermal field, with each pair responsible for a specific zone, thereby expanding the effective heat harvesting area without creating a single complex centralized system.
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 approach enables the generation of 25 to 500 megawatts of power for extended periods, overcoming geographical limitations and inefficiencies of traditional systems, making geothermal energy a more viable and sustainable option for global energy needs.
Implementation Method 1
pumping heated water from a plurality of extraction wells to a power generation unit
Implementation Method 2
extracting thermal energy from the heated water in the power generation unit
Implementation Method 3
pumping or reinjecting the cooled water back into the subsurface via a plurality of injection wells
Data Source
AI summary
Disclosed herein are system, apparatus, article of manufacture, method and/or computer program product embodiments, and/or combinations and sub-combinations thereof, for using a hot sedimentary aquifer (HSA) in geothermal energy generation applications. An example embodiment operates by pumping, via multiple extraction wells, heated water from one or more extraction depths of an HSA. The HSA is identified based on a permeability satisfying a threshold permeability range. The example embodiment further operates by extracting, via a power generation unit, heat from the heated water to generate power and transform the heated water into cooled water. Subsequently, the example embodiment operates by injecting, via multiple injection wells, the cooled water at one or more injection depths of the HSA.