油气地质与采收率2025，Vol.32Issue(3)：113-121,9.DOI:10.13673/j.pgre.202310029
含杂质CO2对砂岩溶蚀规律的影响
Influence of CO2 with impurities on dissolution law of sandstone
摘要
Abstract
The CO2 captured from the flue gas of coal-fired power plants usually contains other gases such as nitrogen oxides,sulfur oxides,and O2.These gases may threaten safe CO2 sequestration after they are injected with CO2 into formation.However,there are still some gaps in Chinese and overseas research on the influence of CO2 with impurities on the dissolution law of sandstone.Therefore,this paper took a sandstone reservoir in an oilfield as the research object and conducted an experimental study on the reaction of CO2 containing different concentrations of NO2,SO2,and NO2+SO2 with formation water and reservoir rock under dif-ferent reaction times,temperatures,and pressures.Atmospheric-pressure and high-pressure tests were carried out,respectively.The dissolution rate,micro-morphology,composition,and mechanical properties of the core before and after the reaction,as well as the cation concentration in the solution after the reaction,were analyzed.The results show that during the reaction among other gas,CO2,formation water,and reservoir rock,feldspar,dolomite,chlorite,and other minerals in the core are dissolved,and core dissolution mainly occurs in feldspar;quartz is slightly dissolved when the reaction time reaches 21 days.The core dissolution rate increases as the reaction time increases.The core dissolution rate also increases when the pressure changes from atmospheric pressure to 10 MPa,indicating that the reaction time and pressure have a noteworthy influence on the core dissolution rate.For the same impurity concentration,SO2 is more likely to dissolve sandstone than NO2,and the core dissolution rate is higher when SO2 and NO2 are injected simultaneously.The injection of NO2 decreases the tensile strength and Poisson's ratio of sandstone and increases the elastic modulus.The SO2 injection increases the tensile strength and elastic modulus of the core and decreases the Poisson's ratio of the core.关键词
CCUS/CO2/杂质气体/水岩反应/岩心溶蚀Key words
CCUS/CO2/other gases/water-rock reaction/core dissolution分类
能源科技引用本文复制引用
姬泽敏,郝鹏飞,陈兴隆,史彦尧,向勇..含杂质CO2对砂岩溶蚀规律的影响[J].油气地质与采收率,2025,32(3):113-121,9.基金项目
国家自然科学基金面上项目"碳源杂质-超临界CO2体系L80-13Cr马氏体钢缝隙腐蚀机理与控制方法"(ZX20220200),内蒙古自治区科技厅重大科技专项"中低压纯氢与掺氢燃气管道输送及其应用关键技术研发——中低压纯氢/掺氢燃气管输工艺与关键设备研究"(ZX20220036),北京市自然科学基金面上项目"X80钢焊接接头在多介质耦合的液态/近临界区CO2体系中的腐蚀机理研究"(ZX20220002),中国石油科技重大专项"二氧化碳规模化捕集、驱油与埋存全产业链关键技术研究及示范"(2021ZZ01-05). （ZX20220200）
