摘要
针对高重质组分原油(C_(20+)摩尔分数>50%)与CO_(2)体系最小混相压力过高导致常规混相驱效率低的问题,基于高温高压细管实验法,测量不同温度下的最小混相压力,得出不同温度下的驱替效率曲线,并对驱替影响因素进行敏感性分析。研究发现:①低温段(≤200℃)以CO_(2)凝析混相为主,最小混相压力随温度升高增加;②高温段(>200℃)原油轻质组分汽化作用增强,最小混相压力显著下降;③N 2杂质降低CO_(2)溶解度,中间组分(C_(2)~C_(6))增加促进多级接触混相;④混相带前缘突破后效率增速放缓,后缘突破后效率趋稳。
Aiming at the problem of low efficiency of the conventional miscible flooding caused by excessively high minimum miscibility pressure(MMP)in the crude oil with high heavy components(C_(20+)Molar fraction>50%)and CO_(2) systems,this study measured MMP at different temperatures based on high-temperature and high-pressure slim tube experiments,obtained the displacement efficiency curves under various temperatures,and conducted a sensitivity analysis on the influencing factors of displacement.Study results show:①CO_(2) condensation-driven miscibility dominates in the low-temperature range(≤200℃),and the MMP increases with the rise of temperature;②The vaporization of light components in crude oil is enhanced,leading to a significant decrease in MMP in the high-temperature range(>200℃);③N 2 impurities reduce CO_(2) solubility,while the increase of intermediate components(C_(2)~C_(6))promotes multi-contact miscibility;④After the breakthrough of the miscible zone front,the growth rate of displacement efficiency slows down,and the efficiency stabilizes after the breakthrough of the miscible zone trailing edge.
作者
张秋实
田洛
李兴财
梁金中
黎星宇
ZHANG Qiushi;TIAN Luo;LI Xingcai;LIANG Jinzhong;LI Xingyu(College of Petroleum and Natural Gas Engineering,Liaoning Petrochemical University,Liaoning Fushun 113001,China;Engineering Technology Research Institute of China National Petroleum Group Great Wall Drilling Engineering Co.,Ltd.,Liaoning Panjin 124000,China;Beijing Ruisita Technology Co.,Ltd.,Beijing 102200,China;Sinopec Dazhou Natural Gas Purification Co.,Ltd.,Sichuan Dazhou 636500,China)
出处
《非常规油气》
2026年第2期45-53,共9页
Unconventional Oil & Gas
基金
辽宁省国际科技合作计划项目(2023JH2/10700020)。
关键词
高重质油藏
CO_(2)高温混相驱替
高温高压细管实验
最小混相压力
驱替效率
敏感性分析
high heavy oil reservoirs
CO_(2)high-temperature miscible displacement
high-temperature high-pressure slim-tube experiments
minimum miscibility pressure
displacement efficiency
sensitivity analysis
