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1、萬(wàn)方數(shù)據(jù)斷塊油氣田笫19卷第4期FAULT.BLOCKOIL&GASFIELD2012年7月doi:10.6056/dkyqt201204018氣井的流固耦合滲流場(chǎng)分析郭衍茹1,練章華1,魏臣興1’2,藺剛3,王磊1(1.西南石油大學(xué)油氣藏地質(zhì)及開(kāi)發(fā)T程同家重點(diǎn)實(shí)驗(yàn)窀.硼川成都610500;2.巾國(guó)石油集團(tuán)渤海鉆探T程有限公司丁程技術(shù)研究院天津300450;3沖國(guó)石化中原油田分公司博士后工作站,河南濮陽(yáng)457001)基金項(xiàng)目:國(guó)家自然科學(xué)基金項(xiàng)目“基于數(shù)值模擬的復(fù)雜地層地應(yīng)力場(chǎng)反演研究”(50774063);國(guó)家科技重大專項(xiàng)專題“復(fù)雜地層漏失診斷及完井方法研究”(2011ZX05005-00
2、6-008HZ)摘要針對(duì)氣井生產(chǎn)過(guò)程中存在的流固耦夸作用,在充分考慮真實(shí)天然氣的偏差因子、密度以覆黏度隨壓力變化的基礎(chǔ)上.建立數(shù)學(xué)模型。利用COMs0LMuhiphysies軟件對(duì)應(yīng)力場(chǎng)、滲流場(chǎng)進(jìn)行耦合計(jì)算,得到流固耦合作用下的滲流場(chǎng)分布。從中提取井底上方20m處切線上的地層壓力、孔隙度、滲透率、滲流速度、氣體密度、氣體黏度等教據(jù),進(jìn)一步分析耦舍滲流場(chǎng)的分布特點(diǎn)。研究得出:氣并耦舍滲流場(chǎng)中壓力分布與常規(guī)數(shù)值分析得到的“壓力漏斗”趨勢(shì)相似.但壓力敷值偏??;由于應(yīng)力場(chǎng)的作用.耦合滲流場(chǎng)中地層的孔隙度和滲透率是變化的,尤其在井底附近的減小程度顯著。進(jìn)而導(dǎo)致耦合滲流速度小于常規(guī)滲流場(chǎng),最終影響氣藏的
3、開(kāi)發(fā)動(dòng)態(tài):受壓力變化的影響,天然氣的黏度、密度分布也近似為“漏斗”趨勢(shì)。結(jié)果表明.考慮流固耦合作用下的滲流場(chǎng)才是地下滲流的真實(shí)反映。關(guān)鍵詞氣井;流固耦合;數(shù)值模擬;滲流場(chǎng);應(yīng)力場(chǎng)中圖分類號(hào):TE349文獻(xiàn)標(biāo)志碼:AAnalysisoffluid-solidCOUplingseepagefieldforgaswellGuoYmI,ElanZhanghua。,WeiChenxin91jLinG¨dWangtad‘(1StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,SouthwlstPetroleumUniversity,C
4、hengdu610:蛐0,China;2.ResearchInstituteofEngineering&Technology,CNPCBolmiDrillingEngineeringCo.L岫一Tianjin3004S0,China;&PostdoctoralWorkstation,ZhongyuanOtifleldCompany,SINOPEC,Puyang457001,ChinalAbstract:Aimingattheexistenceoffluid-solidcouplingduringgaswellproduction,basedonthesufficientconsiderati
5、onofthechangingofrealgasdeviationfactor,densityandviscositywithpressure,amathematicmodelWasestablished.Seepagefielddistributionundertheactionoffluid-solidcouplinghadbeengottenthmughthecouplingcalculationbetweenstressfieldandseepagefieldwithCOMSOLMuhiphysiessofiwttre.Thedistributiondataat20metersabo
6、vebottomholewereextracted,includingformationpressure,porosity,permeability.Dareyvelocity,gasdensityandgasviscosity.11lefeaturesofthefluid-solidcouplingseepagefieldwerefurtheranalyzed.Thestudyleadstotheideasthatthepressuredistributioningaswellcouplingseepagefieldissimilartothetrendofthe“pressurefunn
7、el”obtainedintheconventionalnumericalanalysis,butcoupledseepagepressurevaluesaresmaller.Andbecauseoftheeffectofstressfield,theformationporosityandpermeabilityincouplingseepagefieldarevariable,especiallyevid