高温高压条件下CO_2驱稠油微观运移特征
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摘要
为深入探究高温高压(70℃,8 MPa)条件下,CO_2驱稠油的微观运移特征及其对采收率的影响,利用高温高压微观可视化模拟系统,模拟不同区域不同阶段的CO_2驱稠油过程,研究CO_2驱稠油的微观运移特征,并定量分析该过程中CO_2对稠油采收率的影响。研究结果表明:CO_2驱稠油过程可分为油气互溶、沥青质析出和气体携带部分沥青质颗粒运移3个部分。一次气驱阶段,CO_2先以小气泡自由移动,随后发生变形、合并或分裂,最后以连续相运移为主;关井阶段,CO_2气体溶解于稠油且伴随沥青质析出;二次气驱阶段,CO_2携带部分沥青质颗粒呈连续状运移,扩大波及面积。此外,调整CO_2驱稠油过程中的反应条件可以平衡气体降黏和沥青质析出的相互影响,促进油气有效运移,提高采收率。
In order to study the microscopic migration characteristics of heavy oil by CO_2 flooding and its influence on the recovery at high temperature and high pressure(70 ℃,8 MPa),the microscopic visualization simulation system of high temperature and high pressure was used to simulate the displacement process of heavy oil by CO_2 flooding in different stages and different regions,and its microscopic migration characteristics were studied.The effect of CO_2 on recovery of heavy oil in this process was quantitatively analyzed.The results show that the process of CO_2 flooding can be divided into three parts:oil and gas being soluble with each other,asphaltene precipitation,and gas-carrying asphaltene particles migration.At the stage of first gas flooding,CO_2 moves freely with small bubbles,and then deformation,merge or splitting occurs.Finally,dominated by continuous phase migration.During the closing time,CO_2 dissolves in heavy oil and precipitates out with asphaltene;at the stage of second gas flooding,CO_2 carries some asphaltene particles and migrates continuously,and the swept volume increase.In addition,the reaction conditions in the process of CO_2 flooding are adjusted to balance the interaction of gas viscosity reduction and asphaltene precipitation,so as to promote the effective migration of oil and gas and improve the recovery.
In order to study the microscopic migration characteristics of heavy oil by CO_2 flooding and its influence on the recovery at high temperature and high pressure(70 ℃,8 MPa),the microscopic visualization simulation system of high temperature and high pressure was used to simulate the displacement process of heavy oil by CO_2 flooding in different stages and different regions,and its microscopic migration characteristics were studied.The effect of CO_2 on recovery of heavy oil in this process was quantitatively analyzed.The results show that the process of CO_2 flooding can be divided into three parts:oil and gas being soluble with each other,asphaltene precipitation,and gas-carrying asphaltene particles migration.At the stage of first gas flooding,CO_2 moves freely with small bubbles,and then deformation,merge or splitting occurs.Finally,dominated by continuous phase migration.During the closing time,CO_2 dissolves in heavy oil and precipitates out with asphaltene;at the stage of second gas flooding,CO_2 carries some asphaltene particles and migrates continuously,and the swept volume increase.In addition,the reaction conditions in the process of CO_2 flooding are adjusted to balance the interaction of gas viscosity reduction and asphaltene precipitation,so as to promote the effective migration of oil and gas and improve the recovery.
引文
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[15]王雅春,赵振铎.压力对二氧化碳驱油效果影响的实验研究[J].特种油气藏,2017,24(4):132-135.WANG Yachun,ZHAO Zhenduo.Experimental research on the effect of pressure on CO2oil displacement efficiency[J].Special Oil&Gas Reservoirs,2017,24(4):132-135.
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[20]刘晓蕾,杨思玉,秦积舜,等.二氧化碳对原油中胶质沥青质作用的可视化研究[J].特种油气藏,2017,24(2):149-154.LIU Xiaolei,YANG Siyu,QIN Jishun,et al.Visualization of effects of CO2on colloid and asphaltene in crude oil[J].Special Oil&Gas Reservoirs,2017,24(2):149-154.
[2]王福顺,牟珍宝,刘鹏程,等.超稠油油藏CO2辅助开采作用机理实验与数值模拟研究[J].油气地质与采收率,2017,24(6):86-91.WANG Fushun,MOU Zhenbao,LIU Pengcheng,et al.Experiment and numerical simulation on mechanism of CO2assisted mining in super heavy oil reservoirs[J].Petroleum Geology and Recovery Efficiency,2017,24(6):86-91.
[3]胡伟,吕成远,王锐,等.水驱油藏注CO2非混相驱油机理及剩余油分布特征[J].油气地质与采收率,2017,24(5):99-105.HU Wei,LüChengyuan,WANG Rui,et al.Mechanism of CO2immiscible flooding and distribution of remaining oil in water drive oil reservoir[J].Petroleum Geology and Recovery Efficiency,2017,24(5):99-105.
[4]HAMOUDA A A,HUKWUDEME E A,MIRZA D.Investigating the effect of CO2flooding on asphaltenic oil recovery and reservoir wettability[J].Energy&Fuels,2009,23(2):1 118-1 127.
[5]黄磊,贾英,全一平,等.CO2驱替沥青质原油长岩芯实验及数值模拟[J].西南石油大学学报:自然科学版,2012,34(4):135-140.HUANG Lei,JIA Ying,QUAN Yiping,et al.The long core experiment and numerical simulation research on asphaltic oil with CO2flooding[J].Journal of Southwest Petroleum University:Science&Technology Edition,2012,34(4):135-140.
[6]王琛,李天太,高辉,等.CO2驱沥青质沉积量对致密砂岩油藏采收率的影响机理[J].油气地质与采收率,2018,25(3):107-111.WANG Chen,LI Tiantai,GAO Hui,et al.Study on influencing mechanism of asphaltene precipitation on oil recovery during CO2flooding in tight sandstone reservoirs[J].Petroleum Geology and Recovery Efficiency,2018,25(3):107-111.
[7]王丹,赵瑞明,崔茂蕾,等.高温高压下CO2在原油和高矿化度地层水中溶解度实验--以塔河油田某区三叠系油藏为例[J].石油实验地质,2017,39(增刊1):40-43.WANG Dan,ZHAO Ruiming,CUI Maolei,et al.Solubility of CO2in crude oil and high-salinity formation water under high temperature and high pressure:Taking the Triassic reservoirs in a certain area of Tahe oilfield as an example[J].Petroleum Geology&Experiment,2017,39(Supplement1):40-43.
[8]高树生,薛蕙,胡志明,等.高温高压CO2驱油微观机理实验研究[J].特种油气藏,2010,17(2):92-94.GAO Shusheng,XUE Hui,HU Zhiming,et al.Laboratory study of microscopic mechanism of CO2flooding at high temperature and pressure[J].Special Oil&Gas Reservoirs,2010,17(2):92-94.
[9]吕成远,王锐,崔茂蕾,等.高含水条件下CO2混相驱替实验[J].石油学报,2017,38(11):1 293-1 298.LüChengyuan,WANG Rui,CUI Maolei,et al.Displacement experiment of CO2miscible flooding under high water condition[J].Acta Petrolei Sinica,2017,38(11):1 293-1 298.
[10]李宾飞,叶金桥,李兆敏,等.高温高压条件下CO2-原油-水体系相间作用及其对界面张力的影响[J].石油学报,2016,37(10):1 265-1 272,1 301.LI Binfei,YE Jinqiao,LI Zhaomin,et al.Phase interaction of CO2-oil-water system and its effect on interfacial tension at high temperature and high pressure[J].Acta Petrolei Sinica,2016,37(10):1 265-1 272,1 301.
[11]HASSANV M,SHAHSAVANI B,ANOOSHE A.Study of temperature effect on asphaltene precipitation by visual and quantitative methods[J].Journal of Petroleum Technology and Alternative Fuels,2013,3(2):1-18.
[12]SONG Z,ZHU W,WANG X,et al.2-D pore-scale experimental investigations of asphaltene deposition and heavy oil recovery by CO2flooding[J].Energy&Fuels,2018,32(3):3 194-3 201.
[13]王明,杜利,聂法健,等.高温高压CO2/水交替微观驱油机制及运移特征[J].科技导报,2014,32(36):80-85.WANG Ming,DU Li,NIE Fajian,et al.Microscopic visualization simulation of CO2/water alternating flooding[J].Science&Technology Review,2014,32(36):80-85.
[14]高云丛,赵密福,王建波,等.特低渗油藏CO2非混相驱生产特征与气窜规律[J].石油勘探与开发,2014,41(1):79-85.GAO Yuncong,ZHAO Mifu,WANG Jianbo,et al.Performance and gas breakthrough during CO2immiscible flooding in ultralow permeability reservoirs[J].Petroleum Exploration and Development,2014,41(1):79-85.
[15]王雅春,赵振铎.压力对二氧化碳驱油效果影响的实验研究[J].特种油气藏,2017,24(4):132-135.WANG Yachun,ZHAO Zhenduo.Experimental research on the effect of pressure on CO2oil displacement efficiency[J].Special Oil&Gas Reservoirs,2017,24(4):132-135.
[16]牛保伦.超临界CO2/水交替微观驱油特征研究[J].科学技术与工程,2017,17(25):51-56.NIU Baolun.Study on the microscopic flooding characteristic of water-alternating-supercritical gas[J].Science Technology and Engineering,2017,17(25):51-56.
[17]BOLOURI H,SCHAFFIE M,KHARRAT R,et al.An experimental and modeling study of asphaltene deposition due to CO2miscible injection[J].Petroleum Science and Technology,2013,31(2):129-141.
[18]ZANGANEH P,AYATOLLAHI S,ALAMDARI A,et al.Asphaltene deposition during CO2injection and pressure depletion:A visual study[J].Energy&Fuels,2012,26(2):1 412-1 419.
[19]CUI M,WANG R,LV C,et al.Research on microscopic oil displacement mechanism of CO2EOR in extra-high water cut reservoirs[J].Journal of Petroleum Science&Engineering,2017,154:315-321.
[20]刘晓蕾,杨思玉,秦积舜,等.二氧化碳对原油中胶质沥青质作用的可视化研究[J].特种油气藏,2017,24(2):149-154.LIU Xiaolei,YANG Siyu,QIN Jishun,et al.Visualization of effects of CO2on colloid and asphaltene in crude oil[J].Special Oil&Gas Reservoirs,2017,24(2):149-154.