超临界二氧化碳射流冲蚀页岩实验研究

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Abstract Supercritical carbon dioxide(SC-CO2) jet breaking shale is a prominent shale gas drilling method. The shale sample of Longmaxi Formation was collected from southeast of Chongqing area. Based on the experiment platform of SC-CO2 jet breaking rock，the collected shale samples were impact by the SC-CO2 jets with varied jet pressures. The micro changes between original and eroded shale samples were studied utilizing CT，SEM/EDX，XRD and XRF methods. It’s indicated that the collected shale is characterized by low porosity，high clay mineral content and concordant bedding；impacted by SC-CO2 jet，the end face of shale core take on grid-like broken phenomenon，while it takes on large volumetric layered broken phenomenon on the whole；the erosion of shale mineral induced by SC-CO2 may caused the changes of micro-structure of shale，which may reduce mechanical strength of shale and is conducive to the rock breaking.

Key words： SC-CO2 jet Shale SEM Stress wave Erosion

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http://www.rockmech.org/EN/Y2015/V34/I04/787

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