陈帅,石祥超,高雷雨,唐杨,李清鲮

• 1:西南石油大学油气藏地质及开发工程国家重点实验室

摘要(Abstract)：

为了研究高温后花岗岩的可钻性和微观损伤变化，同时也为了研究高温后不同冷却时间对可钻性的影响，对高温热处理后的花岗岩冷却不同时间(2,4,24,48 h),通过可钻性实验和铸体薄片鉴定，得到高温对花岗岩可钻性的影响规律和影响机理，同时也得到不同冷却时间对花岗岩可钻性的影响。研究结果表明，花岗岩在热处理不超过500℃和自然冷却2 h的约束下始终保持一个较高的可钻性级值，在冷却4,24,48 h后，高温对可钻性的影响表现为3个阶段(第一次劣化阶段、强化阶段、第二次劣化阶段)。微裂纹产生的位置及数量影响着岩石抵抗破碎的难易程度，400℃热处理后花岗岩内部微裂纹开始显著增加，当石英颗粒内部产生大量微裂纹时，花岗岩的可钻性显著降低。100℃热处理后同时冷却不超过4 h会显著影响花岗岩的可钻性，200～400℃热处理后，花岗岩的可钻性级值会随着冷却时间(4～48 h)的继续增加显著增加，500℃对花岗岩产生的损伤是不可恢复的，600℃已经完全使花岗岩劣化。弄清高温和冷却时间对花岗岩可钻性的影响，可以为干热岩资源的高效开采提供基础的理论支撑。

关键词(KeyWords)： 冷却时间;高温;花岗岩;可钻性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(地区联合基金)(U20A20266);; 中国石油-西南石油大学创新联合体项目(2020CX040103)

作者(Author): 陈帅,石祥超,高雷雨,唐杨,李清鲮

DOI: 10.19509/j.cnki.dzkq.2022.0102

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