西南石油大学学报（自然科学版）2017，Vol.39Issue(1)：133-139,7.DOI:10.11885/j.issn.1674-5086.2015.04.24.01
缝洞型碳酸盐岩油藏注气吞吐EOR效果评价
Evaluation of EOR Effect of Gas Huff-n-puff in Fractured Vuggy Carbonate Reservoirs
摘要
Abstract
Large water-eroded caves,solution pores,and fractures are the main spaces of fractured vuggy carbonate reservoirs with strong heterogeneity.The technology of gas huff-n-puff is an effective way to improve oil recovery in such reservoirs.In this study,an indoor physical simulation apparatus was designed and produced for carbonate reservoirs in order to explore the huff-n-puff effect of different gases.The huff-n-puff effect and its mechanism for four gases(CO2,N2,CO2 injected before N2,CO2 injected after N2) were analyzed considering the parameters of oil change rate,gas generation rate,and cumulative gas production.The experimental results show that the huff-n-puff mechanism of the four injected gases is obvious.The lowest oil change rate was 0.422(N2 huff-n-puff).The mixed gas (CO2 and N2 mixture) huff-n-puff fully develops a synergistic effect.CO2 dissolved in crude oil decreases oil viscosity,while N2 occupies the high positions of caves and forms a gas cap due to gravitational differentiation.The huff-n-puff effect of the gaseous mixture of CO2 and N2 is better than that of a single gas,and CO2 injection after N2 huff-n-puff can achieve the best effect with an oil change rate of 0.861.Experimental research shows that gas huff-n-puff is an effective EOR,and the huff-n-puff effect of CO2 injected after N2 is more remarkable.关键词
缝洞型稠油油藏/注气吞吐/吞吐物理模型/二氧化碳/氮气/提高采收率Key words
fractured-vuggy heavy oil reservoir/gas injection huff-n-puff/huff-n-puff physical simulation/CO2/N2/enhanced oil recovery分类
能源科技引用本文复制引用
苏伟,侯吉瑞,刘娟,朱道义,席园园..缝洞型碳酸盐岩油藏注气吞吐EOR效果评价[J].西南石油大学学报（自然科学版）,2017,39(1):133-139,7.基金项目
国家科技重大专项(2011ZX05014-003) （2011ZX05014-003）
国家重点基础研究发展计划(“973”计划)(2011CB201006). （“973”计划）
