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1、研究論文（Articles）科技導(dǎo)報2011，29（01）特低滲透儲層滲流特征和影響因素1，21，23何文祥，馬清，馬超亞1.長江大學(xué)地球化學(xué)系，湖北荊州4340232.長江大學(xué)油氣資源與勘探技術(shù)教育部重點實驗室，湖北荊州4340233.中國石油天然氣股份有限公司長慶油田分公司第七采油廠，陜西吳旗717606摘要為了研究特低滲透儲層滲流特征及影響因素，以鄂爾多斯盆地白豹油田為例，對特低滲透巖心的單相和兩相滲流特征進行分析。結(jié)果表明，特低滲巖心單相滲流具有擬啟動壓力梯度，滲透率越小，擬啟動壓力梯度越大；其滲流曲線不再為一條直線，而為下凹型曲線，呈現(xiàn)非達西滲流特征；其流變曲線不是直
2、線，而為上凸型曲線，流體為非牛頓假塑性流體，在較小外力作用下不發(fā)生流動，只產(chǎn)生彈性變形，只有當(dāng)外力大于某值時，流體才發(fā)生流動，且具有明顯的屈服應(yīng)力；動極限剪切應(yīng)力與滲透率的關(guān)系表明，動極限剪切應(yīng)力隨滲透率減小而急劇增大；隨著剪切速率的增大，視黏度逐漸降低，在剪切作用之后，流體濃度具有變小的特性；油水兩相滲流曲線說明束縛水飽和度和殘余油飽和度偏高，共滲區(qū)較窄，且隨著含水飽和度增大，油相滲透率快速下降，水相滲透率緩慢增長。巖心的滲透率大小、潤濕性、水鎖等因素均對滲流特征有影響。關(guān)鍵詞特低滲透儲層；啟動壓力梯度；單相滲流；非達西滲流中圖分類號TE348文獻標(biāo)識碼Adoi10.3981
3、/j.issn.1000-7857.2011.01.03SeepageCharacteristicsandInfluencingFactorsinUltra-lowPermeabilityReservoirs1,21,23HEWenxiang,MAQing,MAChaoya1.DepartmentofGeochemistry,YangtzeUniversity,Jingzhou434023,HubeiProvince,China2.KeyLaboratoryofExplorationTechnologiesforOilandGasResources,MinistryofEduc
4、ation;YangtzeUniversity,Jingzhou434023,HubeiProvince,China3.No.7ProductionPlant,ChangqingOilFieldCompany,ChinaNationalPetroleumCorporation,Wuqi717606,ShaanxiProvince,ChinaAbstractInordertostudyseepagecharacteristicsandinfluencingfactorsinultra-lowpermeabilityreservoirs,withsamplestakenfromOr
5、dos,experimentsofsinglephaseflowandoil-waterphaseflowwereconducted.Theresultsindicatethereexistsathresholdpressuregradientforsinglephaseflowsforpartofsamples.Theflowisofnon-darcyseepagewhenthepressuregradientislowanditchangesintodarcyflowathighpressure;butforothersamples,noobviousnon-darcyfl
6、owisfound.Thelowerthecorepermeabilityis,thehigherthepressureunderwhichnon-Darcystatewillretainandlesstheflowvolumewillbe.Theflowcurveforthecoreisnotastraightlinebutacurveprotrudingtotheshearingstressaxis.Thefluidisnon-Newtonianandfakeplasticfluid,whichdoesnotmovebesidessomeelasticdeformation
7、underaweakexternalforce,andwhichmovesunderastrongexternalforce,withanobviousyieldstress.Therelationbetweenmovingshearingstressandpermeabilityindicatesthattheshearingstressdecreasesrapidlywiththedecreaseofpermeability.Theapparentviscosityreducesslow
