广东化工2023年第4期·58·www.gdchem.com第50卷总第486期有机盐-聚合物钻井液在北部湾大斜度井中的应用王养锋1，刘智勤1，陈力1，艾常明2，余意1，刘贤玉1(1．中海石油(中国)有限公司湛江分公司，广东湛江524057；2．中海油能源发展股份有限公司工程技术湛江分公司，广东湛江524057)[摘要]南海北部湾盆地涠洲某油田目的层位于涠三段和流一段，前期已钻六口开发井，后期为动用流一段Ⅴ油组储量，决定部署两口大斜度调整井，井斜均大于80°，且裸眼段较长。流一段平均孔隙度19.3%，平均渗透率3405md，属于中孔高渗储层，为更好的保护储层，经室内试验和配方优选，形成了一套新型低密度无固相有机盐-聚合物钻井液体系，并在两口大斜度调整井中应用。现场应用表明，该体系携岩性好，抑制性强，储层保护效果好，为南海西部类似油田的开发积累了宝贵的经验。[关键词]无固相；有机盐；高渗；大斜度井；储层保护[中图分类号]TQ[文献标识码]A[文章编号]1007-1865(2023)04-0058-03ApplicationofOrganicSaltPolymerDrillingFluidinHighlyDeviatedWellsinBeibuGulfWangYangfeng1,LiuZhiqin1,ChenLi1,AiChangming2,YuYi1,LiuXianyu1(1.CNOOCChinaLimitedZhanjiangBranch,Zhanjiang524057；2.ZhanjiangBranchofCNOOCEnergy&Tech-Drilling&ProductionCo.,Zhanjiang524057,China)Abstract:ThetargetlayerofanoilfieldinWeizhou,BeibuGulfBasininthewestoftheSouthChinaSeaislocatedinWeisanmemberandLiuyimember.Intheearlystage,sixdevelopmentwellshavebeendrilled.Inthelaterstage,thereservesofoilformationVinLiuyimemberhavebeenutilized.Itisdecidedtodrilltwohighinclinationadjustmentwells,withwellinclinationgreaterthan80°andlongopenholesection.TheaverageporosityofthefirstsectionofLiuheformationis19.3%andtheaveragepermeabilityis3405md.Itbelongstoamediumporosityandhighpermeabilityreservoir.Inordertobetterprotectthereservoir,anewlow-densitysolid-freeorganicsaltpolymerdrillingfluidsystemhasbeenformedthroughlaboratorytestsandformulationoptimization,andhasbeenappliedintwohigh-angleadjustmentwellsinthewestoftheSouthChinaSea.Fieldapplicationshowsthatthesystemhasgoodlithology,stronginhibitionandgoodreservoirprotectioneffect,whichhasaccumulatedvaluableexperienceforthedevelopmentofsimilaroilfieldsinthewe...
