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1、遼寧石油化工大學(xué)繼續(xù)教育學(xué)院論文低滲透油藏?cái)?shù)值模擬技術(shù)研究摘要隨著現(xiàn)代石油工業(yè)的發(fā)展,低滲透油田的開(kāi)發(fā)愈來(lái)愈為人們所重視。與中、高滲油藏相比較,低滲透油藏具有以下明顯滲流特征:流體滲流不遵循達(dá)西定律,滲流中存在啟動(dòng)壓力梯度,并且應(yīng)力敏感性影響不可忽略。本文在廣泛調(diào)研的基礎(chǔ)上,綜合考慮啟動(dòng)壓力梯度和應(yīng)力敏感性,對(duì)低滲透油田的數(shù)值模擬方法進(jìn)行研究。主要考慮油水兩相具有相同的啟動(dòng)壓力梯度,并且啟動(dòng)壓力梯度的大小與地層滲透率和含水飽和度有關(guān),同時(shí)考慮地層彈塑性變形引起的滲透率改變。在此基礎(chǔ)上,建立了符合實(shí)際情況的二維油水兩相數(shù)學(xué)模型,并通過(guò)IMPES方法
2、進(jìn)行數(shù)值求解,對(duì)低滲透油藏注水開(kāi)發(fā)的生產(chǎn)特征,產(chǎn)能影響因素及不同注采井網(wǎng)方式進(jìn)行了研究,研究表明啟動(dòng)壓力梯度、應(yīng)力敏感性、油水粘度差和毛管力對(duì)低滲透油藏產(chǎn)能影響明顯。關(guān)鍵詞:低滲透油藏,啟動(dòng)壓力梯度,應(yīng)力敏感性,IMPES方法,數(shù)值模擬25遼寧石油化工大學(xué)繼續(xù)教育學(xué)院論文AbstractWiththedevelopmentofmodernoilindustry,theexploitationoflowpermeabilityreservoirhasbeenpaidmoreandmoreattentioninrecentyears.Compared
3、withmediumandhighpermeabilityreservoirs,thelowpermeabilityreservoirhasdifferentseepageflowcharacteristics,whichareasfollows:TheflowofthefluiddoesnotobeyDarcy`sLaw;Thestartingpressuregradientexistsintransfusion;Thestresssensitivityinfluencecannotneglect.Thispaper,basedonwidesp
4、readinvestigationandstudy,consideredstartingpressuregradientandstresssensitivityinfluence,makessomeresearchonnumericalsimulationoflowpermeabilityreservoir.Specifically,itisconsideredthatoilandwaterhavethesamestartingpressuregradient,whichhastherelationshipwithabsolutepermeabi
5、lityandwatersaturation.Atthesametime,itisalsoconsideredthattheabsolutepermeabilitywillvary,becauseofstratumelastoplasticitydistortion.Onthisbasis,atwo-dimensionalmathematicalmodelofoil-watertwo-phaseissetup,whichissolvedwiththeIMPESnumericalmethod.Theproductioncharacteristics
6、,thefactorsaffectingthedeliverabilityandthedifferentinjectionpatternwerestudied.Theresultindicatesthatstartingpressuregradient、stresssensitivity、oil/waterviscosityratioandcapillarypressurehaveobviouseffecttothedeliverabilityoflowpermeabilityreservoir.Keywords:Lowpermeabilityr
7、eservoir,Startingpressuregradient,Stresssensitivity,ThemethodofIMPES,Numericalsimulation25遼寧石油化工大學(xué)繼續(xù)教育學(xué)院論文目錄摘要IAbstractII目錄III1緒論11.1研究目的和意義11.2國(guó)內(nèi)外研究現(xiàn)狀11.2.1低滲透油藏滲流機(jī)理及特征研究11.2.2低滲透油藏滲流模型的研究31.2.3低滲透油藏?cái)?shù)值模擬技術(shù)應(yīng)用的研究51.3研究?jī)?nèi)容和技術(shù)路線51.3.1研究?jī)?nèi)容51.3.2技術(shù)路線72低滲透油藏滲流基本規(guī)律和油藏?cái)?shù)值模擬基礎(chǔ)82.1低滲透油藏滲
8、流特征82.1.1低滲透油藏滲流呈現(xiàn)非線性特征82.1.2低滲透油藏存在啟動(dòng)壓力梯度102.1.3低滲透油藏存在應(yīng)力敏感性122.2低滲