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时间:2020-01-13
《低渗透油藏渗流物理特征的几点新认识.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第37卷第2期石油农驺沾届V01.37.No.22015年3月PETRoLEUMGEoLoGY&EXPERⅡENTMar.,2015文章编号:1001-6112(2015)02-0129-05doi:10.7603/s40972—015—0021—7低渗透油藏渗流物理特征的几点新认识计秉玉,赵宇,宋考平,许关利(1.中国石化石油勘探开发研究院,北京100083;2.东北石油大学石油工程学院,黑龙江大庆163318)摘要:对于低渗透油藏.油水界面张力、岩石润湿性和孔喉比是影响产量和采收率的重要因素.而润湿指数和润湿角通过毛管数与驱油效率有直接的定量关系。该文提出
2、了一个关联着界面张力、润湿性和孔喉比的修正毛管数概念,建立了基于Amott润湿指数与USBM指数的润湿角表征方法.继而推导出低渗透储层毛管数表达式.并通过岩心实验确定出其与残余油饱和度的关系。以此为基础给出不同界面张力与润湿情况下的相对渗透率曲线、驱油效率和注入能力的计算公式,揭示了各种油藏物理参数之间的关联性,为优化低渗透油层化学驱改变界面张力、润湿性控制参数.进而为提高驱油效率和采收率提供了理论依据。关键词:毛管数;润湿角;界面张力;相对渗透率;驱油效率;低渗透储层中圈分类号:rE311文献标识码:ANewinsightsintothephysicalpe
3、rcolationfeaturesoflow-permeabilityreservoirsJiBingyu,ZhaoYu,SongKaoping,XuGuanli(1.SINOPECPetroleumExploration&ProductionResearchInstitute,Beng100083,China;2.SchoolofPetroleumEngineering,NortheastPetroleumUnwemi@,Daqing,Heilongfiang163318,China)Abstract:Forlow-permeabilityreservoir
4、s,interfacialtension,rockwettabilityandpore-throatratioayeimportantfactorsaffectingproductionandrecovery.Wettabilityindexandwettinganglehaveadirectquantitativerelation—shipwithoildisplacementefficiency.Thispaperpresentsaconceptofmodifiedcapillarynumberassociatedwithinterfacialtensio
5、n,rockwettabilityandpore—throatratio,andestablishesawettinganglecharacterizationmethodoflow—permeabilityreservoirbasedonAmottwettabilityindexandUSBMindex.Wealsoderiveacapilarynumberexpressionforlow—permeabilityreservoirsanddeterminetherelationshipwithresidualoilsaturationthroughcore
6、test.Basedonthis,thecalculationformulasofarelativepermeabilitycurve,oildisplacementefficiencyandinjectionabilityaregivenfordifferentconditionsofinterfacialtensionandwettingangle,whichrevealstherelationshipbetweenreservoirphysicalcharacteristics.Thestudyprovidesatheoreticalbasisforop
7、ti—mizingchemicalflooding,changinginterfacialtensionandwettabilitycontrollingparametersinlow-permeabilityreservoir,andfurtherimprovesoildisplacementeficiencyandrecovery.Keywords:capillarynumber;wettingangle;interfacialtension;relativepermeability;displacementefficiency;low-permeabil
8、ityreservoir储层润湿性、毛
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