酸蚀作用对岩石裂隙剪切行为的影响规律研究

doi:10.13722/j.cnki.jrme.2022.0588

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摘要水力–酸化多级交替激发已成为深部热储增产改造的关键技术。以青海共和花岗岩裂隙为研究对象，对每一块裂隙试样均实施6次不同酸化处理的直剪试验。试验结果表明：(1) 经历多次直剪试验后，岩石裂隙的剪切力学行为由脆性破坏变为韧性破坏，峰值抗剪强度明显降低，而残余抗剪强度变化不明显；(2) 经酸蚀处理后，岩石裂隙的剪切力学行为仍表现为韧性破坏，但峰值与残余抗剪强度均有明显降低；(3) 基于经典摩擦学理论，提出粗糙裂隙剪切体积计算公式，与试验结果吻合较好；(4) 酸蚀处理后，不同矿物的差异化溶蚀速率增加裂隙表面粗糙度，然而，剪切在裂隙面内诱发的大量微裂缝进一步促进酸蚀作用，进而显著劣化裂隙表面凸起体强度，后者占据竞争的主导地位，从而导致岩石裂隙表现出弱化效应。

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	张重远1
	2
	窦子豪3
	周伦仕4
	李津津5
	赵志宏3
	李鉴峰5
	陈进帆3
	张士安1
	赵星光6

关键词 ：岩石力学, 干热岩, 水力压裂, 酸蚀作用, 岩石裂隙, 剪切行为, 损伤体积

Abstract：The multi-stage hydraulic-acid stimulation has become a key technology for permeability enhancement of geothermal reservoirs. In this study，the artificial fracture samples were artificially produced from the granite collected from Gonghe Basin，China，direct shear tests were performed on each fracture sample for six times after different acid immersion treatments. The results show that the shear behavior of rock fractures changes from brittle failure to ductile failure after during the previous five shear tests. The peak shear strength significantly reduces，but the residual shear strength does not change significantly during the previous five shear tests. After acid immersion treatment，the shear behavior of the rock fractures still exhibits ductile failure，but the peak and residual shear strengths significantly reduce. Based on wear theory，a formula of calculating shear-induced damage volume of rough fractures is developed，which is in good agreement with the experimental results. After acid immersion treatment，the differential dissolution rates of different minerals increase the fracture surface roughness，but the acid corrosion is further promoted by the large number of micro-cracks in the fracture surfaces induced during the previous five shear tests，which in turn degrades the mechanical properties of fracture asperities. Because the latter mechanism is dominant，rock fractures exhibit weakening effects after acid immersion treatment.

Key words： rock mechanics hot dry rock hydraulic fracturing acid corrosion rock fracture shear behavior damage volume

引用本文:

张重远1，2，窦子豪3，周伦仕4，李津津5，赵志宏3，李鉴峰5，陈进帆3，张士安1，赵星光6. 酸蚀作用对岩石裂隙剪切行为的影响规律研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3256-3265.
ZHANG Chongyuan1，2，DOU Zihao3，ZHOU Lunshi4，LI Jinjin5，ZHAO Zhihong3，LI Jianfeng5，CHEN Jinfan3，ZHANG Shian1，ZHAO Xingguang6. Effect of acid corrosion on shear behaviors of rock fractures. , 2023, 42(S1): 3256-3265.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0588 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3256

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