摘要
CO_(2)驱油是利用CO_(2)提高原油采收率(CCUS-EOR)的技术,是减少碳排放的有效手段之一。为了研究油藏注CO_(2)过程中油气体系相间传质特征,开展了油藏注CO_(2)/干气接触实验,明确了不同压力下油藏注气过程中一次接触条件下油气体系组分变化规律。研究结果表明:CO_(2)与原油一次接触过程中,对挥发性组分和不易挥发组分的相间传质是蒸发抽提,对中间组分的相间传质是溶解扩散,且溶解扩散能力强于蒸发抽提;随着压力的上升,挥发性组分的蒸发抽提能力增强,不易挥发组分的蒸发抽提能力减弱,中间组分的溶解扩散能力增强;注气初期压力较低时,油气体系相间传质以蒸发抽提为主,随着压力上升,油气体系中挥发性组分的相间传质变为溶解扩散;干气与原油一次接触过程中,中间组分和不易挥发组分的相间传质是蒸发抽提;CO_(2)对原油的蒸发抽提能力远强于干气。
CO_(2)flooding is a technique that utilizes CO_(2)to enhance oil recovery(CCUSEOR),and an effective means to reduce carbon emissions.To understand the interphase mass transfer in the petroleum system during CCUSEOR,CO_(2)/dry gas contact experiments were conducted to elucidate the changes in components of the petroleum system during the initial contact conditions at different pressures.The results indicate that during the initial contact between CO_(2)and oil,the interphase mass transfer for volatile and nonvolatile components occurs through evaporative extraction,while the interphase mass transfer for intermediate components occurs through dissolution diffusion,which is stronger than evaporative extraction.As pressure increases,the volatile components show enhanced evaporative extraction,the nonvolatile components reflect diminished evaporative extraction,and the intermediate components exhibit augmented dissolution diffusion.At relatively low pressure in the initial stage of gas injection,the interphase mass transfer of the petroleum system is dominated by evaporative extraction.As pressure increases,the mechanism of interphase mass transfer for volatile components shifts to dissolution diffusion.During the initial contact process between dry gas and oil,the interphase mass transfer for intermediate and nonvolatile components is dominantly evaporative extraction.CO_(2)is more capable of evaporative extraction than dry gas.
作者
苏金长
刘斌
李儒广
SU Jinchang;LIU Bin;LI Ruguang(Engineering Technology Company,Energy Technology&Services Limited,CNOOC,Shenzhen,Guangdong 518054,China)
出处
《新疆石油地质》
CAS
CSCD
北大核心
2024年第5期590-594,共5页
Xinjiang Petroleum Geology
基金
中国海洋石油集团有限公司实验平台项目(E-J621F006)。
关键词
CCUS-EOR
一次接触
蒸发气驱
凝析气驱
蒸发抽提
溶解扩散
CCUS⁃EOR
initial contact
evaporative gas flooding
condensate gas flooding
evaporative extraction
dissolution diffusion
