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时间:2020-06-06
《高压低渗砂岩油藏储层驱替特征及影响因素.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第43卷第3期中南大学学报(自然科学版)、,0L43No32012年3月JournalofCentralSouthUniversity(ScienceandTechnology)MaY.2012高压低渗砂岩油藏储层驱替特征及影响因素王瑞飞,吕新华。,国殿斌(1.西安石油大学石油工程学院,陕西西安,710065;2.中石化中原油田分公司,河南濮阳,457001)摘要:利用室内水驱油、氮气驱油驱替实验,对东濮凹陷深层高压低渗砂岩油藏驱替特征及影响因素进行研究。研究结果表明:随物性变好,两相共渗区变宽,驱替效果变好。水驱中相对渗透率曲线交叉点分布相对集中,气驱中气相相对渗透率曲线发散。气
2、驱与水驱效果对比,特低渗储层气驱效果好,低渗及低渗以上储层水驱效果好。影响驱替特征的主要因素有驱替速度、净覆压力、两相启动压力梯度、储层物性。特低渗储层存在一最佳驱替速度,驱替时要求净覆压力尽可能小。水驱或气驱中驱油效率不会大幅度提高。气驱与水驱相比,其驱替特征的差异在于流度比、润湿性、储层微观孔隙结构及气、液渗流规律等的差异。关键词:深层高压低渗透砂岩油藏;驱替特征;驱油效率;微观孔隙结构;两相启动压力梯度中图分类号:TE311文献标志码:A文章编号:1672—7207f2O12)03—1072—08Displacementcharacteristicsandinfluencin
3、gfactorsindeepsectionhighpressureandlow-permeabilitysandstonereservoirWANGRui—fei,LOXin.hua,GUODian—bin(1.CollegeofPetroleumEngineering,Xi’anShiyouUniversity,Xi’an710065,China;2.ZhongyuanOilfieldCompany,SINOPEC,Puyang457001,China)Abstract:Thedisplacementcharacteristicsandinfluencingfactorsofde
4、epsectionhighpressureandlow-permeabilitysandstonereservoirinDongpuSagwereanalyzedwiththewaterandN2floodingexperiment.Theresultshowsthatthebetterthepermeability,thewiderthetwo-phaseregion,andthebetterthedisplacementefect.Thedistributionofthetwo-phasepointofintersectionisrelativelyfocusedinwater
5、floodingexperiment,andthedistributionofrelativepermeabilitycurvesofgasphaseisrelativelyemanative.Theeffectofgasfloodinginultra-lowpermeabilityreservoirisbeter,whilethatofwaterfloodingisbetterinlowpermeabilityreservoir.Thefactorsthataffectdisplacementcharacteristicsmainlyincludedisplacementrate
6、,effectiveoverburdenpressure,start—uppressuregradientoftwophases,andreservoirproperties.Thereisaprimedisplacementrateinultra—lowpermeabilityreservoir.Theeffectiveoverburdenpressureshouldbeminimalindisplacement.TheoildisplacementeficiencyCannotbelargelyimproved.Thedifferencesofdisplacementchara
7、cteristicsbetweenN2floodingandwaterfloodinglieinthedifferencesofmobilityratio,wettability,micro—porestructureandtheseepagelaw.Keywords:deepsectionhi曲pressureandlow-permeabilitysandstonereservoir;displacementcharacteristics;oildisplaceme
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