Hydrothermal evolution analysis and performance optimization in multi-well fractured reservoirs for enhanced geothermal systems

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2024-11-04 DOI:10.1016/j.applthermaleng.2024.124809
Weiwu Ma , Yifan Xu , Shams Forruque Ahmed , Jiangzirui Xu , Gang Liu
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Abstract

The successful development of Enhanced Geothermal Systems relies on constructing high-quality fracture networks. However, the mechanism of hydrothermal evolution in geothermal reservoirs with artificial fracture networks remains poorly understood. This study aims to elucidate the mechanism of hydrothermal evolution in fractured reservoirs to optimize geothermal energy extraction. Novel metrics, namely reservoir heating efficiency and reservoir flow efficiency, were introduced to assess performance. The study comparatively investigated six fracture structures and evaluated their impact on system production. Key findings reveal that fluid flow in multiple horizontal wells fractures reservoirs efficiently, with heat effectively extracted from the edges of the Stimulated Reservoir Volume. Enhanced reservoir heating efficiency and optimized flow efficiency were achieved due to improved heat exchange and fluid diversion. Optimal hydrothermal evolution was realized with a reservoir heating efficiency of 0.2022 and a reservoir flow efficiency of 0.2398, using a configuration of a 0° rotation angle, 30 kg/s injection mass flow, 60 °C injection temperature, 3.12 mm hydraulic fracture aperture, and 200 m production well spacing. These findings provide valuable insights into reservoir design and production strategies for Enhanced Geothermal System.
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强化地热系统多井压裂储层的水热演化分析和性能优化
强化地热系统的成功开发有赖于构建高质量的断裂网络。然而,人们对具有人工裂缝网络的地热储层中的热液演化机制仍然知之甚少。本研究旨在阐明裂缝储层的热液演化机制,以优化地热能源的提取。研究引入了新的指标,即储层加热效率和储层流动效率,以评估其性能。研究比较调查了六种断裂结构,并评估了它们对系统生产的影响。主要研究结果表明,多水平井中的流体流动可有效压裂储层,并从受刺激储层体积的边缘有效提取热量。由于改善了热交换和流体分流,提高了储层加热效率,优化了流动效率。在旋转角度为 0°、注入质量流量为 30 kg/s、注入温度为 60 °C、水力压裂孔径为 3.12 mm、生产井间距为 200 m 的配置下,实现了最佳热液演化,储层加热效率为 0.2022,储层流动效率为 0.2398。这些发现为强化地热系统的储层设计和生产策略提供了宝贵的见解。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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