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时间:2020-04-05
《恒进气量欠平衡钻井方式气侵特征及井口压力控制研究.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35卷第3期石油钻采工艺Vo1.35No.32013年5月OILDRILLING&PRODUCTIONTECHNOLOGYMav2013文章编号:1000—7393(2013)03—0019—03恒进气量欠平衡钻井方式气侵特征及井口压力控制研究张兴全李相方'任美鹏马龙徐大融(1.中国石油大学石油工程学院,北京102249;2.中国石油大学机械储运学院,北京102249)引用格式:张兴全,李相方,任美鹏,等.恒进气量欠平衡钻井方式气侵特征及井口压力控制研究[J].石油钻采_T-艺,2013,35(3):19—21.摘要:
2、欠平衡钻井打开储层后,随着打开储层的厚度不断增加,储层进入井筒中的气体不断增加,引起井口含气率剧烈变化,从而造成井底压力的失控。计算了欠平衡钻井期间不同井深含气率的变化,分析了不同进气量和井口回压对井筒含气率的影响;在考虑井口回压对井底压力增加值影响的情况下,得到欠平衡钻井打开储层期间恒进气量时井口回压的计算方法。结果表明:井筒中的气体在井口处急剧膨胀,井口回压对井口段气体含气率影响很大,对500m以下井段含气率影响很小;在恒定进气量下,打开储层厚度越大,井口回压越大,井筒恒进气量越小,需施加的井口回压越大。关键词:欠平
3、衡钻井;恒进气量;井口回压;打开储层厚度;气侵中图分类号:TE249文献标识码:ACharacteristicsofgaskickinunderbalanceddrillingwithconstantairintakeflowandofwellheadpressuremanagementZHANGXingquan,LIXiangfang,RENMeipeng2,MALong,XUDar0ng(1.CollegeofPetroleumEngineering,ChinaUniversityofPetroleum,Beijin
4、g102249,China;2.CollegeofMechanicalandTransportationEngineering,ChinaUniversityofPetroleum,Beijing102249,China)Abstract:Intheprocessofpenetratingthereservoirbyunderbalanceddrilling,withtheincreaseofthepenetratedreservoirthick—ness,thevolumeofgaskickingintothewell
5、boreincreases,whichcausesthedrasticchangeofwellheadvoidfraction,leadingtothebottom—holepressureoutofcontro1.Thechangingofvoidfractionsindiferentwelldepthsarecalculatedduringunderbalanceddrilling,andtheinfluenceofdiferentairintakeflowandwellheadbackpressureonwellb
6、orevoidfractionsisanalyzed.Inconsiderationofwell-headpressureaddingvalueonbosomholepressure,thecomputingmethodofwellheadpressureofconstantairintakeflowisobtainedforpenetratingthereservoirbyunderbalanceddrilling.Theresultsshowthatgasrapidlyexpandswhenitreachesthes
7、urface,andthewellheadbackpressurehaveaenormousefectonthevoidfractionsatwellheadwhilehavealittleinfluenceonthevoidfractionunder500meters.Keepingtheairintakeflowconstant,withtheincreaseofthepenetratedreservoirthickness,thewellheadpressureincreases.Thesmallertheairi
8、ntakeflow,thebiggerthewellheadpressureneedstoload.Keywords:underbalanceddrilling;constantairintakeflow;wellheadbackpressure;penetratedreservoirthickness;gaskic
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