| 不同冷却时间对高温花岗岩可钻性实验研究 |
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| 引用本文： | 陈帅,石祥超,高雷雨,唐杨,李清鲮.不同冷却时间对高温花岗岩可钻性实验研究[J].地质科技通报,2023,42(2):356-364. |
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| 作者姓名： | 陈帅 石祥超 高雷雨 唐杨 李清鲮 |
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| 作者单位： | 西南石油大学油气藏地质及开发工程国家重点实验室, 成都 610500 |
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| 基金项目： | 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 |
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| 摘 要： | 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。
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| 关 键 词： | 冷却时间 高温 花岗岩 可钻性 |
| 收稿时间： | 2021-08-19 |
Experiment research of the influence of different cooling times on the drillability of high-temperature granite |
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| Affiliation: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China |
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| Abstract: | To study the drillability and microscopic damage changes of granite after high temperature exposure and to study the influence of different cooling times on drillability after high temperature exposure, granite for high-temperature heat treatment was cooled by different times (2 h, 4 h, 24 h, and 48 h). Through the drillability experiment and the cast thin identification of the processed rock samples, the influence law and mechanism of high temperature on the drillability of granite were obtained, and the influence of different cooling times on the granite drillability was also investigated. The research results show that granite always maintains a high drillability index under the constraints of heat treatment not exceeding 500℃ and natural cooling for 2 h. After cooling 4 h, 24 h, and 48 h, the impact of high temperature on drillability shows three stages (First degradation stage, strengthening stage, second degradation stage). The location and number of microcracks affect the difficulty of rock resistance to crushing. After 400℃ heat treatment, the internal microcracks of the granite begin to increase significantly. When the microcracks generate a large number of microcracks inside the quartz particles, the drillability of the granite is significantly reduced. After heat treatment at 100℃, cooling for no more than 4 h at the same time will significantly affect the drillability of granite. After heat treatment at 200-400℃, the drillability index of granite will increase significantly as the cooling time (4-48 h) continues to increase. The damage caused by 500℃ to granite is irreversible, and 600℃ has completely degraded the granite. Understanding the influence of high temperature and cooling time on the drillability of granite can provide basic theoretical support for the efficient exploitation of hot dry rock resources. |
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