Fracture Network Volume Fracturing Technology in
High-temperature Hard Formation of Hot Dry Rock |
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作者姓名: | CHEN Zuo XU Guoqing ZHOU Jian LIU Jiankun |
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摘 要: |
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收稿时间: | 2021/7/26 0:00:00 |
修稿时间: | 2021/10/28 0:00:00 |
Fracture Network Volume Fracturing Technology in High-temperature Hard Formation of Hot Dry Rock |
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Authors: | CHEN Zuo XU Guoqing ZHOU Jian LIU Jiankun |
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Institution: | SINOPEC Research Institute of Petroleum Engineering,Beijing 102206,China |
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Abstract: | It is more difficult for a hot dry rock to form a fracture network system than shale due to its special lithology, physical and mechanical properties under high temperature. The essential characteristics, rock mechanics and in-situ stress characteristics of a hot rock mass have been systematically studied by means of laboratory tests and true tri-axial physical simulation. The fracture initiation and propagation characteristics under different geological and engineering conditions are physically simulated, and the main controlling factors for the formation of a complex fracture network are revealed. The technology of low displacement for enhancing thermal cracking, gel fluid for expanding fracture and variable displacement cyclic injection for increasing a fracture network has been applied in the field, and good results have been achieved. Micro-seismic monitoring results demonstrate that complex fractures were formed in the field test, and the stimulation volume for heat exchanging reaches more than 3 million cubic meters. The research results play an important role in the stimulation technology of an enhanced geothermal system (EGS) and realize a breakthrough for power generation. |
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Keywords: | hot dry rock granite fracture network natural fractures thermal cracking cyclic injection volume stimulation Gonghe Basin |
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