浅层边水断块油藏氮气复合吞吐实验
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摘要
浅层边水断块油藏由于含油面积小、非均质性强、黏度高以及开发过程中存在边水突进快等问题,氮气吞吐可有效补充地层能量,具有控抑边水突进的潜力。通过采用高温高压边水径向流模型对氮气、氮气-表面活性剂和氮气-二氧化碳3种吞吐介质控水增油可行性进行室内实验研究,以吞吐阶段含水率最大降低值、控水持续时间和采收率提高程度为指标,并结合模型压力变化对3种吞吐介质控水增油效果进行评价和对比,并在此基础上分别分析3种吞吐介质控水增油机理。结果表明,3种吞吐介质均能控抑边水;氮气吞吐控抑边水能力最强,但氮气的驱油效率低,增油效果较差;而氮气复合吞吐在实现控抑边水的基础上,通过表面活性剂和二氧化碳提高了驱油效率,增油效果优于氮气吞吐。
The strong heterogeneity and high viscosity of crude oil in shallow fault-block reservoirs with small oil content lead to a rapid edge water coning problem during the production.The N_2 huff and puff has the potential of controlling edge water coning since the N_2 can supply the power of the reservoir.Therefore,the feasibility of N_2/N_2-surfactan/N_2-CO_2 huff and puff for controlling the edge water coning and enhancing oil recovery was studied in laboratory by the radial flow model with edge water at high temperature and high pressure.The factors including maximum reduction of water cut,water control duration,and increase of oil recovery were selected to evaluate and compare the effect of controlling the water coning and improving oil production and to analyze the mechanism of controlling edge water coning and improving oil production at different pressures.The results show that:N_2/N_2-surfactant/N_2-CO_2 huff and puff all have the ability of controlling edge water coning;the N_2 huff and puff has the best ability of controlling water coning,but has the least ability of improving oil production with a low displacement efficiency;the N_2 compound huff and puff has the ability of controlling edge water coning,and has the better ability of improving oil production than N_2 huff and puff with the surfactant and CO_2 to improve the oil displacement efficiency.
The strong heterogeneity and high viscosity of crude oil in shallow fault-block reservoirs with small oil content lead to a rapid edge water coning problem during the production.The N_2 huff and puff has the potential of controlling edge water coning since the N_2 can supply the power of the reservoir.Therefore,the feasibility of N_2/N_2-surfactan/N_2-CO_2 huff and puff for controlling the edge water coning and enhancing oil recovery was studied in laboratory by the radial flow model with edge water at high temperature and high pressure.The factors including maximum reduction of water cut,water control duration,and increase of oil recovery were selected to evaluate and compare the effect of controlling the water coning and improving oil production and to analyze the mechanism of controlling edge water coning and improving oil production at different pressures.The results show that:N_2/N_2-surfactant/N_2-CO_2 huff and puff all have the ability of controlling edge water coning;the N_2 huff and puff has the best ability of controlling water coning,but has the least ability of improving oil production with a low displacement efficiency;the N_2 compound huff and puff has the ability of controlling edge water coning,and has the better ability of improving oil production than N_2 huff and puff with the surfactant and CO_2 to improve the oil displacement efficiency.
引文
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[12]王鹏,赵凤兰,侯吉瑞,等.氮气泡沫吞吐抑制潜山底水油藏水平井底水锥进实验研究[J].油气地质与采收率,2018,25(5):110-115.WANG Peng,ZHAO Fenglan,HOU Jirui,et al.An experimental study of horizontal bottom water coning control with nitrogen foam huff and puff in buried-hill reservoirs[J].Petroleum Geology and Recovery Efficiency,2018,25(5):110-115.
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[14]张国强,孙雷,吴应川,等.小断块油藏CO2、N2单井吞吐强化采油可行性对比研究[J].钻采工艺,2008,31(4):53-55,73.ZHANG Guoqiang,SUN Lei,WU Yingchuan,et al.Feasibility study on single well CO2,N2huff and puff in small fault block reservoir[J].Drilling&Production Technology,2008,31(4):53-55,73.
[15]李亮,张建军,林森,等.底水油藏高含水水平井注N2实验与参数优化[J].断块油气田,2016,23(3):354-357.LI Liang,ZHANG Jianjun,LIN Sen,et al.Experiment research and parameter optimization of N2huff and puff for watered-out horizontal well in bottom water reservoir[J].Fault-Block Oil&Gas Field,2016,23(3):354-357.
[2]杨胜来,王亮,何建军,等.CO2吞吐增油机理及矿场应用效果[J].西安石油大学学报:自然科学版,2004,19(6):23-26.YANG Shenglai,WANG Liang,HE Jianjun,et al.Oil production enhancing mechanism and field applying result of carbon dioxide huff-puff[J].Journal of Xi’an Shiyou University:Natural Science Edition,2004,19(6):23-26.
[3]王志兴,赵凤兰,侯吉瑞,等.断块油藏水平井组CO2协同吞吐效果评价及注气部位优化实验研究[J].石油科学通报,2018,3(2):183-194.WANG Zhixing,ZHAO Fenglan,HOU Jirui,et al.Synergistic effects during CO2huff and puff of horizontal well groups in a faultblock reservoir and gas injection optimization under laboratory conditions[J].Journal of Petroleum Science Bulletin,2018,3(2):183-194.
[4]侯广.致密油体积压裂水平井CO2吞吐实践与认识[J].大庆石油地质与开发,2018,37(3):163-167.HOU Guang.Practice and understanding of the CO2huff-puff for the volume fractured horizontal well in tight oil reservoirs[J].Petroleum Geology&Oilfield Development in Daqing,2018,37(3):163-167.
[5]王秋月.TH稠油油藏注CO2/烟道气提高采收率实验研究[D].成都:西南石油大学,2017.WANG Qiuyue.Experiment study of EOR in TH heavy oil reservoir by CO2/flue gas injection[D].Chengdu:Southwest Petroleum University,2017.
[6]侯利,赵军梅,李凤玲,等.边底水油藏CO2吞吐控水稳油技术研究[J].内蒙古石油化工,2017,43(9):72-74.HOU Li,ZHAO Junmei,LI Fengling,et al.Study of stabilizing oil production by water control during CO2huff-puff in reservoir with bottom and edge water[J].Inner Mongolia Petrochemical Industry,2017,43(9):72-74.
[7]周拓,刘学伟,王艳丽,等.致密油藏水平井分段压裂CO2吞吐实验研究[J].西南石油大学学报:自然科学版,2017,39(2):125-131.ZHOU Tuo,LIU Xuewei,WANG Yangli,et al.Experiments of CO2huff-n-puff process in staged fracturing horizontal wells for developing tight oil reservoirs[J].Journal of Southwest Petroleum University:Science&Technology Edition,2017,39(2):125-131.
[8]庞诗师.CO2/N2吞吐提高稠油采收率实验与数值模拟研究[D].成都:西南石油大学,2016.PANG Shishi.Experiment of enhancing heavy oil recovery and study of numerical stimulation for CO2/N2huff and puff[D].Chengdu:Southwest Petroleum University,2016.
[9]孙雷,庞辉,孙扬,等.浅层稠油油藏CO2吞吐控水增油机理研究[J].西南石油大学学报:自然科学版,2014,36(6):88-94.SUN Lei,PANG Hui,SUN Yang,et al.Mechanism study on water control and enhanced oil recovery by CO2huff-puff for shallow heavy oil reservoir[J].Journal of Southwest Petroleum University:Science&Technology Edition,2014,36(6):88-94.
[10]章星,王珍珍,王帅,等.可视装置中CO2与正戊烷或原油接触特征和表征方法[J].石油实验地质,2017,39(3):402-408.ZHANG Xing,WANG Zhenzhen,WANG Shuai,et al.Visual contact characteristics and characterization of the CO2and n-pentane/crude oil interface[J].Petroleum Geology&Experiment,2017,39(3):402-408.
[11]马铨峥,杨胜来,韩伟,等.准噶尔盆地吉木萨尔凹陷芦草沟组致密油储层氮气吞吐物理模拟实验研究[J].油气地质与采收率,2018,25(1):112-116.MA Quanzheng,YANG Shenglai,HAN Wei,et al.Experimental study on the physical simulation of N2huff and puff of the tight oil reservoir in the Lucaogou Formation of Jimsar Sag,Junggar Basin[J].Petroleum Geology and Recovery Efficiency,2018,25(1):112-116.
[12]王鹏,赵凤兰,侯吉瑞,等.氮气泡沫吞吐抑制潜山底水油藏水平井底水锥进实验研究[J].油气地质与采收率,2018,25(5):110-115.WANG Peng,ZHAO Fenglan,HOU Jirui,et al.An experimental study of horizontal bottom water coning control with nitrogen foam huff and puff in buried-hill reservoirs[J].Petroleum Geology and Recovery Efficiency,2018,25(5):110-115.
[13]孙永鹏,杨胜来,徐君,等.低渗油藏单井N2吞吐效果影响因素实验研究[J].断块油气田,2011,18(1):83-86.SUN Yongpeng,YANG Shenglai,XU Jun,et al.Experiment research on influence factors of N2huff-puff for single well in low permeability reservoir[J].Fault-Block Oil&Gas Field,2011,18(1):83-86.
[14]张国强,孙雷,吴应川,等.小断块油藏CO2、N2单井吞吐强化采油可行性对比研究[J].钻采工艺,2008,31(4):53-55,73.ZHANG Guoqiang,SUN Lei,WU Yingchuan,et al.Feasibility study on single well CO2,N2huff and puff in small fault block reservoir[J].Drilling&Production Technology,2008,31(4):53-55,73.
[15]李亮,张建军,林森,等.底水油藏高含水水平井注N2实验与参数优化[J].断块油气田,2016,23(3):354-357.LI Liang,ZHANG Jianjun,LIN Sen,et al.Experiment research and parameter optimization of N2huff and puff for watered-out horizontal well in bottom water reservoir[J].Fault-Block Oil&Gas Field,2016,23(3):354-357.
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