辽宁工程技术大学学报（自然科学版）2023，Vol.42Issue(5)：513-520,8.DOI:10.11956/j.issn.1008-0562.2023.05.001
高温作用对三维应力下花岗岩渗透率影响试验研究
Experimental study on the effect of high temperature on the permeability of granite under three dimensional stress
摘要
Abstract
In order to reveal the influence law of three-dimensional stress on the permeability of granite thermal reservoir after high temperature,this study took the geothermal exploitation of Songliao basin as the engineering background,the high temperature(150℃～650℃)after processing granite as test object,and used the independent research and development of permeability measuring device.With CO2 as permeable medium,under the three-dimensional stress(different pore pressure,axial pressure and confining pressure)granite gas permeability test was carried out,and the granite permeability under different combination of three-dimensional stress was obtained.The influences of heating temperature,pore pressure and volumetric stress on granite permeability were analyzed.The results show that the permeability of granite increases exponentially with temperature,and the permeability increases slowly within 550℃,while the permeability increases rapidly between 550℃and 650℃.It is found that the gas slippage effect is easy to occur when the pore pressure is small,and the permeability of granite decreases with the increase of pore pressure.When the pore pressure increases to a certain critical value,the permeability of granite increases with the increase of pore pressure,and the critical value is related to temperature and volume stress.With the increase of bulk stress,the granite is compressed,the original fractures are closed,the connectivity is weakened,and the permeability of granite decreases.关键词
增强型地热系统/花岗岩/渗透率/高温作用/三维应力/体积应力Key words
enhanced geothermal system/granite/permeability/high temperature action/three dimensional stress/volumetric stress分类
能源科技引用本文复制引用
唐巨鹏,魏志豪,邱于曼..高温作用对三维应力下花岗岩渗透率影响试验研究[J].辽宁工程技术大学学报（自然科学版）,2023,42(5):513-520,8.基金项目
国家自然科学基金项目(51874165) （51874165）
辽宁"兴辽英才计划"支持项目(XLYC1902106) （XLYC1902106）
