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1、2015年6月大慶石油地質(zhì)與開發(fā)June,2015第34卷第3期PetroleumGeologyandOilfieldDevelopmentinDaqingVo1.34No.3DoI:10.3969/J.ISSN.1000—3754.2015.03.015冪律型壓裂液對裂縫擴展影響的數(shù)值模擬曾青冬姚軍(中國石油大學(xué)(華東)石油工程學(xué)院,山東青島266580)摘要:水力壓裂作為油氣藏增產(chǎn)的重要措施,壓裂液的流變性質(zhì)對裂縫擴展形態(tài)起著重要作用。為探尋冪律型壓裂液對裂縫擴展的影響,建立了考慮巖石變形和裂縫冪律流體流動的二維非均質(zhì)油藏水力裂縫擴展數(shù)學(xué)模型,分別采用擴展有限元和標準有限元法求解應(yīng)
2、力場和流場,并通過迭代法將兩場耦合起來。通過與經(jīng)典模型計算結(jié)果比較,證明了模型能準確地預(yù)測裂縫擴展形態(tài)。參數(shù)敏感性分析表明:巖石彈性模量的非均質(zhì)越強,越容易形成短、寬型水力裂縫,而泊松比的非均質(zhì)幾乎沒有影響;冪律流體流性指數(shù)越大,越容易形成短、寬型水力裂縫;冪律流體稠度系數(shù)越大,越容易形成短、寬型水力裂縫。該模型可為壓裂設(shè)計和預(yù)測提供理論指導(dǎo)。關(guān)鍵詞:冪律流體;壓裂液;非均質(zhì)性;水力壓裂;擴展有限元;裂縫擴展中圖分類號:TE357.12文獻標識碼:A文章編號:1000—3754(2015)03—0081—06NUMERICALMoDELINGOFTHEPoWER.LAWFRACTURI
3、NGFLUIDINFLUENCESoNTHEHYDRAULICFRACTUREPRoPAGATIoNZENGQingdong,YAOJun(SchoolofPetroleumEngineering,ChinaUniversityPetroleum,Qingdao266580,China)Abstract:Hydraulicfracturingisanimportantstimulatingtreatmentforoilandgasreservoirs,andtherheologicalpropertiesofthefracturingfluidplaysignificantrolein
4、thefracturepropagatedconfigurations.Toseekfortheinflu-encesofthepower-lawfracturingfluidonthepropagation,themathematicalmodelof2Dhydraulicfracturepropa—gationfortheheterogeneousoilreservoirisestablishedintheconsiderationsoftherockdeformationsandpower—lawfluidflowinthefractures,thestressandflowfi
5、eldsaresolvedthroughtheextendedandstandardfiniteelementmethodsrespectively,andmoreoverthetwofieldsarecoupledbytheiteratingmethod.Themodelisverifiedtobecapableofforecastingthefracturepropagationaccuratelybycomparisonwiththecomputedresultsoftheclassicalmode1.Furthermore,theparametersensitivityanal
6、ysisshowsthatthestrongertheheterogeneityoftheelasticmodu—lusis,theshorterandwiderthefractureswillinduce;thereisalmostnoinfluencefortheheterogeneityofthePois—sonSratio;thelargertheliquidityindexofthepower—lawfluidis,theshorterandwiderfractureswillproduce;thelargertheconsistencyindexofthepower—law
7、fluidis,theshorterandwiderthefractureswillgenerate.Themodelcanprovidethetheoreticguidanceforthefracturingdesignandprediction.收稿日期:2014-04-15改回日期:2014.10.22基金項目:國家自然科學(xué)基金項目(51234007)、長江學(xué)者和創(chuàng)新團隊發(fā)展計劃(1RT1294)和中央高校基本科研業(yè)務(wù)費專項資金(11CX