Brazilian Splitting Tests on Organic-Rich Shale Under Real-Time High-Temperature Steam Heating or High-Temperature Steam Heating-Cooling
In the process of in-situ thermal injection mining of organic-rich shale,the tensile strength under thermal coupling is directly related to the strength and stability of shale ore layers,which has a crucial impact on shale mining.In order to study the relationship between the splitting mechanical properties of shale and temperature changes under high-temperature steam heating-cooling or under real-time high-temperature steam heating,Brazilian splitting tests were conducted on organic-rich shale within the range of 500 ℃ using a self-developed real-time high-temperature steam testing system and a rock press.The research results indicate that as the temperature increases,the tensile strength under high-temperature steam heating-cooling shows a trend of first decreasing,then increasing,and then decreasing.It reaches its maximum value at 300 ℃,and the peak strain shows a continuous upward trend.Under real-time high-temperature steam heating,the tensile strength shows a trend of first decreasing and then increasing,reaching its lowest point at 400 ℃,and the peak strain shows a trend of first decreasing,then increasing,and then decreasing.The splitting failure cracks of shale samples are composite cracks,with the main cracks being through cracks and the secondary cracks being bedding cracks.Furthermore,the number of secondary cracks increases with the increase of temperature.The research results have certain engineering significance for determining fracturing parameters during the transformation of fluid migration channels.
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