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1、第38卷第2期石油钻采工艺Vol.38No.22016年3月OILDRILLING&PRODUCTIONTECHNOLOGYMar.2016文章编号:1000–7393(2016)02–0138–06DOI:10.13639/j.odpt.2016.02.002车66区块钻井过程井底压力波动及渗流规律12李云 贾江鸿1.中国石化胜利石油工程有限公司技术装备处;2.中国石化胜利石油工程有限公司钻井工艺研究院引用格式:李云,贾江鸿.车66区块钻井过程井底压力波动及渗流规律[J].石油钻采工艺,2016,38(2
2、):138-143,155.摘要:针对车66区块钻井过程中易出现的阻塞、地层垮塌、井漏甚至井喷等问题,基于环空流体力学并结合地层渗透性特征,分析了在起、下钻及钻井过程中产生的抽汲压力和激动压力的大小,以及钻井液黏度、密度,井深和钻井速率对其影响的规律;依据线性渗流定律,单向流体球面向心流和平面径向流模型研究了井底负压差下进入、钻过储层的渗流规律变化及正压差条件下钻井液漏失情况,得出井底压差越大、地层渗透率越高,地层流体渗流速度越高,钻井液漏失量越大。该分析结果揭示了钻井过程中井底压力波动和井下渗流规律及其相
3、关影响因素,为井身结构设计优化提供了必要依据。关键词:钻井;井底压力;渗流规律;井身结构设计;车66区块中图分类号:TE254 文献标识码:ABottom-holepressurefluctuationandseepagepatternduringwelldrillinginChe-66Block12LIYun,JIAJianghong1.TechnologyandEquipmentDepartment,SINOPECShengliOilfieldServiceCorporation,Dongying,S
4、handong257000,China;2.DrillingTechnologyResearchInstitute,SINOPECShengliOilfieldServiceCorporation,Dongying,Shandong257000,ChinaCitation:LIYun,JIAJianghong.Bottom-holepressurefluctuationandseepagepatternduringwelldrillinginChe-66Block[J].OilDrilling&Product
5、ionTechnology,2016,38(2):144-149,154.Abstract:DrillingoperationsintheChe-66Blockaresusceptibletoblocking,formationcollapsing,lostcirculation,blowoutandothercomplexities.Basedonfluiddynamicsinannulusandwithconsiderationtoformationpermeabilityfeatures,magnit
6、udesofswabbingpressureandsurgepressureproducedduringtrippinganddrillingoperationswereanalyzed,togetherwitheffectsofdrillingfluidviscosities,densities,welldepthsandROPs.Inaccordancewithlinearseepagetheory,modelsforunidirectionalfluidsphericalcentripetalflow
7、andplaneradialflowweredeployedtodetermineseepagepatternsandlostcirculationofdrillingfluidsduringpenetrationofreservoirformationsundernegativepressure.Researchresultsshowthathigherbottom-holedifferentialpressureandformationpermeabilitymayleadtohigherspeedin
8、seepageofformationfluidsandhighervolumeofdrillingfluidslost.Theconclusionshighlightedfluctuationinbottom-holepressureduringdrilling,togetherwithseepagepatternandrelevantinfluencingfactors.Theresearchresultsca