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heat-fluid-solid coupling mechanism of supercritical carbon dioxide jet in rock-breaking

Petroleum Exploration and Development 2021年第6期48卷 1450-1461页

作者： LI Mukun WANG Gang CHENG Weimin PU Shijie NI Hongjian SHI Xian College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China No.1 Oil Production Plant Qinghai Oilfield CompanyPetroChinaQinghai 816499China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

Aiming at the synergistic rock-breaking mechanism of supercritical carbon dioxide(SC-CO_(2))jet pressure and tem-perature difference,a heat-fluid-solid calculation model of rock-breaking stress was established and verified to be effective,and the variations of jet flow field and rock stress with jet standoff distance of SC-CO_(2),water and nitrogen were studied.With the increase of jet standoff distance,the jet pressure of SC-CO_(2) decreases and the jet temperature difference increases.The SC-CO_(2) jet is higher in pressure than the nitrogen jet and differs little from the water jet.Temperature difference of SC-CO_(2) jet is 5 times that of water jet and more than 2.5 ti mes that of nitrogen jet when the jet standoff distance is larger than 10.The tem-perature stress is the main reason why SC-CO_(2) jet is superior to water and nitrogen jets in rock-breaking.The rock under the SC-CO_(2) jet has greater rock stress,effective rock-breaking jet standoff distance and rock-breaking area.The jet pressure plays a major role in rock-breaking when the jet standoff distance is small,while the jet temperature difference plays a major role in rock-breaking when the jet standoff distance is large.The SC-CO_(2) jet is an efficient volume rock-breaking method,which results in tensile and shear failure on the rock surface under short time jet and large area tensile failure inside the rock simultaneously under long time jet.

关键词： supercritical carbon dioxide rock-breaking with jet rock stress jet pr essure jet temperature difference tem-perature stress heat-fluid-solid coupling

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