高温与不同水压下深部砂岩渗透特性试验研究

doi:10.13722/j.cnki.jrme.2019.1113

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摘要岩石的力学性质与渗透特性与应力，温度及渗透压力具有密切关系。运用Rock Top多场耦合试验仪对红砂岩进行100 ℃高温下不同静水压力与渗透压差条件下的温度–应力–渗流耦合试验研究。研究结果表明：(1) 100 ℃高温下红砂岩全应力–应变经历裂隙压密→线弹性变形→微裂纹稳定发展→非稳定破裂发展→峰后变形与破坏5个阶段；(2) 对应岩石应力–应变曲线，流量随应力差的增大呈现反向急速溢出段，反向稳定溢出段，急剧上升段，稳定增长段，此时渗透率随应力差的增大呈现先由初始值下降，保持水平常值，急速增长至伪峰值后衰落，稳定增长至真峰值等变化特征；(3) 红砂岩在高温、高围压作用下的渗透率随围压的等梯度增长近似呈线性降低趋势，在高围压下渗透压差对渗透率影响并不明显，渗透率值趋于稳定，2种方法均显示红砂岩属于典型低渗类岩石；(4) 相同围压与渗透压差下，瞬态法与稳态法2种渗透率测试方法所测结果相近，在30～60 MPa围压范围内，压力条件是影响渗透率的主要原因。

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	张培森1
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	李腾辉1
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关键词 ：岩石力学, 渗透特性, 静水压力, 高温, 稳态法, 瞬态法

Abstract：The mechanical properties and seepage characteristics of rock are closely related to stress，temperature and osmotic pressure. The Rock Top multi-field coupling tester was used to carry out temperature-stress-seepage coupling experiment of red sandstone under different hydrostatic pressures and seepage pressures at the high temperature of 100 ℃. The results show that，at high temperature，the total stress-strain of red sandstone goes through 5 stages including crack compaction，linear elastic deformation，stable development of microcracks，unsteady fracture development，and post-peak deformation and failure. Corresponding to rock stress-strain curve，the curve of the flow and the deviation stress involves inverse overflow，sharply reverse stable overflow，sharp rise and stable growth sections，and the permeability also show a four-stage behavior of decrease from the initial value，keeping level constant，rapid growth to the pseudo peak and declination，and stable growth to the true peak. The permeability of red sandstone under high temperature and high confining pressure shows an approximate linear decreasing trend with the constant gradient growth of the confining pressure. Under high confining pressure，the effect of the seepage pressure difference on the permeability is not obvious，and the permeability value tends to be stable. Both methods show that red sandstone belongs to typical low-permeability rocks. Under the same confining pressure and seepage pressure difference，the results obtained by the transient method and the steady-state method are similar. Under the confining pressure of 30–60 MPa，pressure condition is the main reason affecting the permeability.

Key words： rock mechanics permeability characteristics hydrostatic pressure high temperature steady state method transient method

引用本文:

张培森1，2，赵成业1，2，侯季群1，2，李腾辉1，2. 高温与不同水压下深部砂岩渗透特性试验研究[J]. 岩石力学与工程学报, 2020, 39(6): 1117-1128.
ZHANG Peisen1，2，ZHAO Chengye1，2，HOU Jiqun1，2，LI Tenghui1，2. Experimental study on seepage characteristics of deep sandstone under high temperature and different hydraulic pressures. , 2020, 39(6): 1117-1128.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.1113 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I6/1117

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