Long-Term Performance and Parameter Optimization of Deep Hydrothermal Multi-Well Geothermal Heating Systems

Le résumé fourni par la source

Driven by the carbon peaking and carbon neutrality goals, there is an urgent demand for clean heating in northern China. Deep hydrothermal geothermal energy, with its stable and clean characteristics, has become a key development direction. This work focuses on a practical hydrothermal heating system, developing a three-dimensional simulation model for the hydrothermal coupling process and conducting model validation and parameter sensitivity analysis. The model is validated against field pumping test data, showing good agreement with errors controlled within 5%. Results indicate that well spacing is a critical factor in controlling thermal breakthrough risk. Well spacing over 100 meters apart can effectively maintain long-term thermal sustainability. Formation porosity increases porosity, enhances permeability and fluid flow. This strengthened advective heat transfer can potentially lead to higher outlet temperatures and a greater heat extraction rate. Increasing the flow rate from 60 m3/h to 150 m3/h boosts the heat extraction rate by 122.5% but accelerates thermal breakthrough, necessitating a trade-off between instantaneous output and system lifespan. The study further explores multi-well system performance and thermal interaction effects, investigating the potential of flow allocation strategies to regulate system performance. A balanced flow strategy is shown to effectively isolate thermal influence zones compared to unbalanced schemes. This research aims to provide theoretical support and methodological references for the optimized design and efficient operation of deep hydrothermal heating systems.

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