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干热岩作为清洁的可再生能源是地热能未来开采和利用中最具潜力的部分,具体的开发工程技术称为增强型地热系统(EGS,Enhanced Geothermal System)。化学刺激技术作为水力压裂的一种辅助方法,具有成本低、风险小的特点,在完善储层改造方面具有重要作用。综述了国内外EGS关于化学刺激研究的相关文献,介绍了化学刺激技术的理论基础及常用的几种化学刺激剂(传统酸、缓速酸、螯合剂和CO2化学刺激剂),并对世界上仅有的几个使用化学刺激技术的EGS工程(美国Fenton Hill和法国Soultz干热岩项目)进行了介绍和总结,在此基础上提出了化学刺激剂在增强型地热系统中的研究建议及应用展望,以期为中国未来EGS的科学研究和项目实施提供参考。
Dry hot rock as a clean renewable energy source is the most potential part of geothermal energy exploration and utilization in the future. The specific development engineering technology is called Enhanced Geothermal System (EGS). As an auxiliary method of hydraulic fracturing, chemical stimulation technology has the characteristics of low cost and low risk, and plays an important role in improving reservoir reconstruction. This review summarizes the domestic and foreign literatures related to chemical stimulation research at EGS, introduces the theoretical basis of chemical stimulation technology and several commonly used chemical stimulants (traditional acids, retarded acids, chelating agents and CO2 chemical stimulants) Only a few of the EGS projects using chemical stimulation technology (Fenton Hill in the United States and the Soultz dry-hot rock project in France) were introduced and summarized. Based on this, the research proposals and applications of chemical stimulants in enhanced geothermal systems With a view to providing reference for the future scientific research and project implementation of EGS in China.