Abstract
The permeability of tight sandstone gas reservoirs can be improved using liquid nitrogen (LN2) cryogenic fracturing. To evaluate the effect of the LN2-cooling state on the tensile failure behaviors of the sandstone, a series of physical and mechanical experiments on the sandstone specimens subjected to different LN2 cooling treatments are performed. Compared to the untreated sandstone, the P-wave velocity, tensile strength, and splitting modulus of the frozen sandstone increase by 42.02%, 63.32%, and 22.80%, respectively, while those of the freeze–thaw sandstone decrease by 2.77%, 23.10%, and 11.92%, respectively. After the LN2 cooling treatment, a considerable number of defects inside the sandstone are produced. The fracture energy among all parameters is most sensitive to the LN2 cooling state. After the LN2 cooling treatment, the total fracture length of the sandstone specimens after the frozen and freeze–thaw treatments increases by 29.79% and 37.46%, respectively. The damage degree of the internal structure induced by the LN2 cooling treatment mainly determines the failure mode of the sandstone. The greater the internal structure damage, the more complex the failure pattern.
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Acknowledgements
This project is supported by the National Natural Science Foundation of China (Nos. 52078477 and 51827901), and Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization (2020-3).
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Gao, Y., Hou, P., Su, S. et al. Role of Liquid Nitrogen Cooling State in Physical and Tensile Properties of Sandstone. Int J Thermophys 43, 52 (2022). https://doi.org/10.1007/s10765-022-02981-7
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DOI: https://doi.org/10.1007/s10765-022-02981-7