摘要
以CO_2捕集与封存为研究背景,开展了二氧化碳盐水层封存条件下超临界二氧化碳在多孔结构中的流动规律研究。通过基于孔隙尺度的数值模拟方法,研究了超临界CO_2注入储层多孔结构时突破压力梯度和流动时间以及CO_2饱和度的关系,分析了压力、温度、颗粒直径、接触角和表面张力系数对突破压力梯度的影响规律。研究表明,对于孔隙率以及颗粒分布状况相同的储层结构,在超临界CO_2注入速度相同时,影响突破压力梯度增加的因素包括:CO_2地质封存压力减少,地质封存温度增加,颗粒直径减小,接触角减小或表面张力系数增加。
Supercritical CO_2 flow in porous media under CO_2 saline aquifer storage conditions against the background of CO_2 capture and storage（CCS） was investigated.The pore-scale modeling method was used to investigate the relationship between breakup pressure gradient and flow time, as well the relationship between breakup pressure gradient and CO_2 saturation.The influences of pressure,temperature,grain diameter,contact angle and surface tension on the breakup pressure gradient were analyzed.The results show the breakup pressure gradient increases with elevated temperature,surface tension as well as the decrease of pressure,grain diameter and contact angle under the same injection flow rate into the aquifer with the same porosity and grain distribution.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2011年第5期819-823,共5页
Journal of Engineering Thermophysics
基金
国家自然科学青年基金项目(No.50906043)
清华大学自主科研项目(No.2009THZ02232)
中澳地质封存合作项目CAGS
关键词
二氧化碳盐水层封存
突破压力梯度
压力
颗粒直径
接触角
CO_2 saline aquifer storage
breakup pressure gradient
pressure
grain diameter
contact angle
