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1、石油與天然氣化工第43卷第4期CHEMICALENGINEERINGOFOIL&GAS409川中沙溪廟致密油藏壓裂液技術(shù)研究及應(yīng)用孫川劉友權(quán)熊穎鄭凱吳文剛陳鵬飛張倩(中國石油西南油氣田公司天然氣研究院)摘要川中沙溪廟致密油藏為特低孔、低滲致密儲(chǔ)層,壓裂工藝要求先以滑溜水大排量泵注方式在地層中形成復(fù)雜縫網(wǎng),再以凍膠壓裂液造主縫,形成大規(guī)模的連通性體積縫網(wǎng)。將聚丙烯酰胺類滑溜水與低分子量胍膠類凍膠壓裂液復(fù)合應(yīng)用,開發(fā)出了適合川中沙溪廟儲(chǔ)層的“滑溜水+凍膠”混合壓裂液技術(shù)。其中,滑溜水具有低摩阻、高效防膨等特點(diǎn);凍膠壓裂液具有耐剪切、低傷害等特點(diǎn)
2、;混合壓裂液體系的破乳效果好、返排能力強(qiáng)?,F(xiàn)場試驗(yàn)表明:“滑溜水+凍膠”混合壓裂液技術(shù)具有良好的儲(chǔ)層改造效果,在G36井、G117井應(yīng)用獲得成功,現(xiàn)場降阻率達(dá)61.5%~64.8%、返排率>40%,返排液油水界面清晰,獲井口測試產(chǎn)油45.1t/d。關(guān)鍵詞沙溪廟壓裂滑溜水凍膠破乳傷害中圖分類號:TE357.1文獻(xiàn)標(biāo)志碼:ADOI:10.3969/j.issn.1007‐3426.2014.04.014ResearchandapplicationoftightoilreservoirfracturingfluidinShaxiTemplelay
3、erofCentralSichuanSunChuan,LiuYouquan,XiongYing,ZhengKai,WuWengang,ChenPengfei,ZhangQian(ResearchInstituteofNaturalGasTechnology,PetroChinaSouthwestOilandGasfieldCompany,Chengdu610213,Sichuan,China)Abstract:ThetightreservoirofSichuanShaxiTemplelayerhascharacteristicsofextr
4、emelylowporosityandlowpermeability,andthefracturingprocessrequirestopumpslickwaterwithlargeemissiontoformcomplexfracturenetworksinformation,thenpumpgelfracturingfluidtocreatemainfractureandformalargevolumeofconnectivefracturenetwork.Duetothecompos‐iteapplicationofpolyacryl
5、amideslickwaterandlowmolecularguargumfracturingfluid,amixedfracturingfluidtechnologyof“slickwater+crosslinkedgel”hasbeendeveloped,whichissuit‐abletoShaxiTemplereservoirinCentralSichuan.Slickwaterhascharacteristicsoflowfrictionandhighclaystableperformance,crosslinkedfractur
6、ingfluidhascharacteristicsofexcellentshearresistanceandlowcoredamage,andthemixedfracturingfluidhasgooddemulsificationperformanceandhighflowbackrate.Fieldtestresultsshowthat“slickwater+crosslinkedgel”technologyhasgoodeffectofreservoirstimulation,whichwassuccessfulappliedinG
7、36well,G117well,thedragreductionratereached61.5%~64.8%,flowbackratewasmorethan40%,interfaceoftheflowbackfluidandtheoilisclearandtestingoilproductionachieved45.1t/d.Keywords:ShaxiTemple,fracturing,slickwater,crosslinkedgel,demulsification,damage項(xiàng)目來源:中國石油股份公司科技部科研計(jì)劃項(xiàng)目“四川盆地侏羅
8、系石油勘探開發(fā)關(guān)鍵技術(shù)研究”(2012E‐2601)。作者簡介:孫川(1985-),碩士,工程師。2010年畢業(yè)于西南石油大學(xué)并獲碩士學(xué)位,現(xiàn)在中國石油西南油氣田公司天然氣研究院