二元复合体系界面活性与乳化性能协同提高采收率实验研究
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摘要
二元复合驱能够大幅度提高水驱后油藏采收率,为深化二元复合体系提高采收率机理认识,开展二元复合体系界面活性与乳化性能协同提高采收率研究。通过物理模拟实验、微观可视化驱替实验和核磁共振实验,研究具有不同界面活性和乳化性能二元复合体系的驱油效果,明确渗流过程中其界面活性变化规律,阐明油水界面张力与乳化性能协同提高采收率机理。结果表明,由于油藏的非均质性及驱油体系性能变化,二元复合体系与原油界面张力并非越低越好。过高界面张力不利于洗油效率的提高,而过低界面张力不利于乳化作用的发挥。当油水界面张力与乳化性能配伍关系良好时,二元复合体系既可以利用较低界面张力启动油藏深部残余油,又可以通过残余油滴封堵大孔道,改变油藏深部流场分布,降低非优势层剩余油饱和度,实现大幅度提高采收率的目标。
The binary compound flooding can dramatically improve oil recovery after water flooding.In order to have a better understanding of the enhanced oil recovery(EOR)mechanism of binary compound system,the synergistic effect of interfacial activity and emulsifying properties on EOR was studied.The physical simulation experiments,microscopic visualized displacement experiments,and nuclear magnetic resonance(NMR)experiments were applied,with the purpose to study the oil displacement effect of the systems with different interfacial activity and emulsifying properties,to clarify the change law of interfacial activity of the system during the percolation,and to illustrate the synergistic effect of interfacial tension and emulsification on enhancing oil recovery.Results show that because of the reservoir heterogeneity and the performance change of compound system,a lower interfacial tension between the system and oil may not get a better oil recovery.A high interfacial tension is negative to improve the displacement efficiency.However,a low interfacial tension results in an ignorable emulsification effect.When the oil-water interfacial tension and emulsifying properties match well,the residual oil in deep reservoir may be produced at low interfacial tension of the binary compound system.At the same time,oil droplets could plug large throats to change deep flow field distribution and to reduce remaining oil saturation of non-preferred stratum.All of these would reach the aim to dramatically enhance oil recovery.
The binary compound flooding can dramatically improve oil recovery after water flooding.In order to have a better understanding of the enhanced oil recovery(EOR)mechanism of binary compound system,the synergistic effect of interfacial activity and emulsifying properties on EOR was studied.The physical simulation experiments,microscopic visualized displacement experiments,and nuclear magnetic resonance(NMR)experiments were applied,with the purpose to study the oil displacement effect of the systems with different interfacial activity and emulsifying properties,to clarify the change law of interfacial activity of the system during the percolation,and to illustrate the synergistic effect of interfacial tension and emulsification on enhancing oil recovery.Results show that because of the reservoir heterogeneity and the performance change of compound system,a lower interfacial tension between the system and oil may not get a better oil recovery.A high interfacial tension is negative to improve the displacement efficiency.However,a low interfacial tension results in an ignorable emulsification effect.When the oil-water interfacial tension and emulsifying properties match well,the residual oil in deep reservoir may be produced at low interfacial tension of the binary compound system.At the same time,oil droplets could plug large throats to change deep flow field distribution and to reduce remaining oil saturation of non-preferred stratum.All of these would reach the aim to dramatically enhance oil recovery.
引文
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[2]陈涛平,宋文玲,高明,等.超低界面张力体系驱油方式与微观驱油效果[J].科学技术与工程,2010,10(17):4 259-4 262.CHEN Taoping,SONG Wenling,GAO Ming,et al.The research on displacement ways and microscopic displacement effects of ultralow interfacial tension system[J].Science Technology and Engineering,2010,10(17):4 259-4 262.
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[7]李华斌,陈中华.界面张力特征对三元复合驱油效率影响的实验研究[J].石油学报,2006,27(5):96-98.LI Huabin,CHEN Zhonghua.Characteristics of interfacial tension and oil displacement efficiency with alkaline-surfactant-polymer flooding technology[J].Acta Petrolei Sinica,2006,27(5):96-98.
[8]陈中华,李华斌,曹宝格.复合驱中界面张力数量级与提高采收率的关系研究[J].海洋石油,2005,25(3):53-57.CHEN Zhonghua,LI Huabin,CAO Baoge.Study on the relation between level of IFT and enhanced oil recovery[J].Offshore Oil,2005,25(3):53-57.
[9]舒政,丁思家,韩利娟,等.表面活性剂驱油效率的影响因素研究[J].应用化工,2012,41(6):1 032-1 036.SHU Zheng,DING Sijia,HAN Lijuan,et al.Factors influencing of the surfactant oil displacement efficiency[J].Applied Chemical Industry,2012,41(6):1 032-1 036.
[10]刘艳华,孔柏岭,吕帅,等.稠油油藏聚驱后二元复合驱提高采收率研究[J].油田化学,2011,28(3):288-291,295.LIU Yanhua,KONG Bailing,LüShuai,et al.A study on enhanced oil recovery of surfactant/polymer combinational flooding after polymer flooding in heavy oil reservoir[J].Oilfield Chemistry,2011,28(3):288-291,295.
[11]贾忠伟,杨清彦,袁敏,等.大庆油田三元复合驱驱油效果影响因素实验研究[J].石油学报,2006,27(增刊):101-105.JIA Zhongwei,YANG Qingyan,YUAN Min,et al.Experimental study on influential factors of ASP displacement efficiency in Daqing Oilfield[J].Acta Petrolei Sinica,2006,27(Supplement):101-105.
[12]孙盈盈,岳湘安,张立娟,等.乳化作用对水驱后残余油膜效果的实验与评价[J].新疆石油地质,2014,35(1):73-76.SUN Yingying,YUE Xiang’an,ZHANG Lijuan,et al.Effect of emulation on displacement of residual oil film following waterflooding:Experiment and evaluation[J].Xinjiang Petroleum Geology,2014,35(1):73-76.
[13]赵方剑.特高温低渗透油藏乳液表面活性剂驱现场试验[J].特种油气藏,2017,24(6):125-128.ZHAO Fangjian.Field tests for emulsion surfactant flooding in reservoirs with ultra-high temperatures and low permeability[J].Special Oil&Gas Reservoirs,2017,24(6):125-128.
[2]陈涛平,宋文玲,高明,等.超低界面张力体系驱油方式与微观驱油效果[J].科学技术与工程,2010,10(17):4 259-4 262.CHEN Taoping,SONG Wenling,GAO Ming,et al.The research on displacement ways and microscopic displacement effects of ultralow interfacial tension system[J].Science Technology and Engineering,2010,10(17):4 259-4 262.
[3]FOSTER W R.A low tension waterflooding process[J].Journal of Petroleum Technology,1973,25(2):205-210.
[4]WAGNER O R,LEACH R O.Effect of interfacial tension on displacement efficiency[J].SPEJ,1966,6(4):335-344.
[5]贾忠伟,袁敏,张鑫璐,等.水驱微观渗流特征及剩余油启动机理[J].大庆石油地质与开发,2018,37(1):65-70.JIA Zhongwei,YUAN Min,ZHANG Xinlu,et al.Waterflooding microscopic flow characteristics and the remained oil starting mechanisms[J].Petroleum Geology&Oilfield Development in Daqing,2018,37(1):65-70.
[6]刘晨,王业飞,于海洋,等.低渗透油藏表面活性剂驱油体系的室内研究[J].石油与天然气化工,2011,40(5):486-489,498.LIU Chen,WANG Yefei,YU Haiyang,et al.The laboratory study on surfactant flooding system in low permeable reservoir[J].Chemical Engineering of Oil&Gas,2011,40(5):486-489,498.
[7]李华斌,陈中华.界面张力特征对三元复合驱油效率影响的实验研究[J].石油学报,2006,27(5):96-98.LI Huabin,CHEN Zhonghua.Characteristics of interfacial tension and oil displacement efficiency with alkaline-surfactant-polymer flooding technology[J].Acta Petrolei Sinica,2006,27(5):96-98.
[8]陈中华,李华斌,曹宝格.复合驱中界面张力数量级与提高采收率的关系研究[J].海洋石油,2005,25(3):53-57.CHEN Zhonghua,LI Huabin,CAO Baoge.Study on the relation between level of IFT and enhanced oil recovery[J].Offshore Oil,2005,25(3):53-57.
[9]舒政,丁思家,韩利娟,等.表面活性剂驱油效率的影响因素研究[J].应用化工,2012,41(6):1 032-1 036.SHU Zheng,DING Sijia,HAN Lijuan,et al.Factors influencing of the surfactant oil displacement efficiency[J].Applied Chemical Industry,2012,41(6):1 032-1 036.
[10]刘艳华,孔柏岭,吕帅,等.稠油油藏聚驱后二元复合驱提高采收率研究[J].油田化学,2011,28(3):288-291,295.LIU Yanhua,KONG Bailing,LüShuai,et al.A study on enhanced oil recovery of surfactant/polymer combinational flooding after polymer flooding in heavy oil reservoir[J].Oilfield Chemistry,2011,28(3):288-291,295.
[11]贾忠伟,杨清彦,袁敏,等.大庆油田三元复合驱驱油效果影响因素实验研究[J].石油学报,2006,27(增刊):101-105.JIA Zhongwei,YANG Qingyan,YUAN Min,et al.Experimental study on influential factors of ASP displacement efficiency in Daqing Oilfield[J].Acta Petrolei Sinica,2006,27(Supplement):101-105.
[12]孙盈盈,岳湘安,张立娟,等.乳化作用对水驱后残余油膜效果的实验与评价[J].新疆石油地质,2014,35(1):73-76.SUN Yingying,YUE Xiang’an,ZHANG Lijuan,et al.Effect of emulation on displacement of residual oil film following waterflooding:Experiment and evaluation[J].Xinjiang Petroleum Geology,2014,35(1):73-76.
[13]赵方剑.特高温低渗透油藏乳液表面活性剂驱现场试验[J].特种油气藏,2017,24(6):125-128.ZHAO Fangjian.Field tests for emulsion surfactant flooding in reservoirs with ultra-high temperatures and low permeability[J].Special Oil&Gas Reservoirs,2017,24(6):125-128.
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