【摘 要】
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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
【机 构】
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SINOPEC Research Institute of Petroleum Engineering,Beijing 102206,China
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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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