高温4 000 m静水压力下钻进过程中花岗岩体变形特征

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摘要为从高温岩体中提取热能，需向热能储层花岗岩层中施工深部钻孔，钻孔的稳定性将影响钻井施工的进展，但钻孔的稳定性又受其围岩变形的影响。因此，为研究高温高压下钻孔围岩的变形特性，利用中国矿业大学600 ℃ 20 MN伺服控制高温高压岩体三轴试验机系统，模拟研究4 000 m静水压力下，不同温度时钻孔施工过程中花岗岩体的变形特征，结果表明：(1) 恒温恒压下花岗岩体钻进过程中的变形呈现明显的蠕变特征，轴向和侧向变形均具有完整的初始蠕变和稳态蠕变；(2) 不同温度下钻进过程中花岗岩轴向和侧向变形量随温度的增加而增大，且存在温度阈值，为150 ℃～300 ℃；(3) 4 000 m静水压力下花岗岩体钻进过程中，300 ℃时开始出现明显的加速蠕变过程，500 ℃时产生蠕变破坏。

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	冯子军1
	赵阳升1
	赵金昌1
	万志军2
	董付科3
	张源2

关键词 ：岩石力学, 高温高压, 花岗岩, 钻井, 变形, 临界温度, 高温岩体

Abstract：The stability of borehole will influence the construction progress of deeply drilling hole into the hot granite reservoir so as to extract hot energy from hot dry rock. However，the stability of borehole is subjected to the deformation of surrounding rock. The 600 ℃ 20 MN servo-controlled rock triaxial testing machine with high temperature and pressure developed by China University of Mining and Technology was utilized to investigate the deformation characteristics of surrounding rock of drilling hole at high temperature and pressure. The experiment on the deformation characteristics of granite in the process of drilling at 4 000 m in-situ hydrostatic pressure and different high temperatures was carried out. The results indicate that：(1) A clear creep process occurs in the process of drilling hole in granite at constant pressure and temperature，while the axial and lateral deformations appear the whole initial and secondary creep processes. (2) The axial and lateral strains increase with temperature rising in the process of drilling at 4 000 m hydrostatic pressure and different high temperatures；and there exists a critical temperature which ranges from 150 ℃ to 300 ℃. (3) Tertiary creep of granite deformation clearly happens at 300 ℃ in the process of drilling hole at 4 000 m hydrostatic pressure；and creep damage occurs at 500 ℃.

Key words： rock mechanics high temperature and pressure granite drilling deformation critical temperature hot dry rock

引用本文:

冯子军1，赵阳升1，赵金昌1，万志军2，董付科3，张源2. 高温4 000 m静水压力下钻进过程中花岗岩体变形特征[J]. 岩石力学与工程学报, 2010, 29(S2): 4108-4112.
FENG Zijun1，ZHAO Yangsheng1，ZHAO Jinchang1，WAN Zhijun2，DONG Fuke3，ZHANG Yuan2. GRANITE DEFORMATION CHARACTERISTICS IN DRILLING PROCESS AT 4 000 m HYDROSTATIC PRESSURE AND HIGH TEMPERATURE. , 2010, 29(S2): 4108-4112.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/4108

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