钻探工程2026，Vol.53Issue(1)：46-51,6.DOI:10.12143/j.ztgc.2026.01.007
酸性水-岩作用下花岗岩孔隙结构与热-力学性能劣化机理的实验研究
Experimental study on the degradation mechanism of granite pore structure and thermo-mechanical properties under acidic water-rock interaction
摘要
Abstract
Water-rock interaction(WRI)during Hot Dry Rock(HDR)exploitation is a critical factor affecting the long-term stability of geothermal reservoirs.To address the challenge that conventional experimental methods struggle to simultaneously simulate long-term effects while preserving sample integrity,this study introduces a self-developed high-temperature and high-pressure WRI simulation device.Using an acidic solution as an accelerating medium,dynamic interaction experiments on granite samples were conducted for 3,6,and 9 days.Through a combination of nuclear magnetic resonance,thermal conductivity analysis,and mechanical testing,this research systematically reveals the synergistic degradation mechanism of the granite's pore structure and thermo-mechanical properties under acidic conditions.The results demonstrate that acidic WRI leads to a non-linear and dramatic increase in granite porosity(by 448%within 9 days),with a shift in pore size distribution from predominantly micropores to a higher proportion of meso-and macropores.The deterioration of the pore structure induces a significant decline in thermal conductivity and uniaxial compressive strength,which decrease by 8.63%and 33.19%,respectively,over the same 9-day period,showing highly consistent evolutionary trends.This study successfully establishes a quantitative link between short-term accelerated laboratory simulations and long-term in-situ evolutionary behavior,providing crucial experimental data and theoretical support for accurately predicting the physical-mechanical behavior of HDR reservoirs during their service life,assessing their long-term stability,and ultimately ensuring the safe and efficient development of geothermal resources.关键词
干热岩/水岩作用/花岗岩/酸性溶液/孔隙结构/性能劣化/热传导性能/抗压强度Key words
hot dry rock/water-rock interaction/granite/acidic solution/pore structure/performance degradation/thermal conductivity/compressive strength分类
能源科技引用本文复制引用
程腾飞,陈晨,姜升,张山岭,许振华,刘祥,李鑫,李宏达..酸性水-岩作用下花岗岩孔隙结构与热-力学性能劣化机理的实验研究[J].钻探工程,2026,53(1):46-51,6.基金项目
国家自然科学基金面上项目"干热岩裸眼水平井采热周期内井壁力学行为及其对取热的影响"(编号:42272364) （编号:42272364）
