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时间:2020-04-24
《硬脆性泥页岩微裂缝封堵可视化模拟试验与评价-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第42卷第3期石油钻探技术Vo1.42No.32Ol4年5月PETROLEUMDRILLINGTECHNIQUESMay,2014钻井完井doi:10.3969/j.issn.1001—0890.2014.03.007硬脆性泥页岩微裂缝封堵可视化模拟试验与评价石秉忠,胡旭辉,高书阳,徐江,林永学(1.中国石化石油工程技术研究院,北京100101;2.中国石油冀东油田分公司井下作业公司,河北唐山063200)摘要:为了揭示钻井液对硬脆性泥页岩微裂缝的封堵机理,利用自行研制的可视化微裂缝封堵能力评价仪,采用单一和复
2、合封堵材料,以相同时间内的滤失量和承压能力为标准,并结合观察缝内封堵状况,对7种缝宽的模拟微裂缝进行了封堵效果评价。数据处理分析认为,滤失量与封堵压差不是线性关系;缝宽对应于封堵材料粒径分布曲线上的Dso~s时封堵效果较好;封堵效果不随刚性封堵颗粒质量分数增加而提高;可变形溶胀微粒质量分数为0.5~O.7时,封堵效果最好;封堵试验表明,封堵的位置有3种,其中在缝内喉道处形成的封堵层相对较致密,承压能力相对较强。研究表明,硬脆性泥页岩微裂缝封堵模拟试验评价方法是可行的,能够对微裂缝封堵机理进行深化研究。关键词:微
3、裂缝封堵井壁稳定硬脆性泥页岩中图分类号:TE283文献标识码:A文章编号:1001—0890(2014)03—0032一O6VisualizationSealingSimulationTestandEvaluationofHardBrittleShaleMicrofractureShiBingzhong,HuXuhui,GaoShuyang,XuJiang,LinYongxue(1.SinopecResearchInstituteofPetroleumEngineering,Beijing,100101,Chi
4、na;2.DownholeSe—rviceCompany,Jidong(ZfieldCompany,PetroChina,Tangshan,Hebei,063200,China)Abstract:Inordertounderstandthesealingmechanismofmicrofractureinhardandbrittleshale,aseriesoftestshavebeenconductedusingthenewlydevelopedvisualmicrofracturesealingevalua
5、tioninstrument.ManykindsofUvIShadbeenevaluatedinthetest,includingsingleandcombinedUCMFilter1OSSandsealingpressurewereusedasthecriterionofsealingcapacity.Basedonthesealingcapacitycriterionandvisiblefracturesealingcondition,sevensimulatedfractureswithdifferent
6、apertureswereevaluatedinthisarticle.TheresultsshowedthatfilterlOSSandsealingpressuredifferencedidnothavealinearrelationship.MaximUlTIUMperformancecouldbeachievedwhenfractureaperturewasequaltoI)50一I)58oftheIMs.Betterperformancewouldnotbeachievedwiththein-crem
7、entofrigid删concentration.Theoptimummassfractionrangeofdeformablesealingparticleswas0.5一0.7.ThreedifferentSeallocationshadbeenobservedinthefracture,andthebestsealingperformancewasachievedwhenthesea1formedinthemiddleofthefracture.Theresearchresultsshowedthatth
8、ehardandbrittleshalemicrofracturesealingsimulationmethodwasfeasible,anditwasusefultothefurtherstudyofthesealingmechanismofmicrofracture.Keywords:microfracture;sealing;boreholestability;hardandbr
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