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时间:2019-05-13
《随钻测量钻井液脉冲传输理论中幂律流体水击方程的建立》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第35卷第6』fJ』新躺石油地质Voj.35.No.6201412川XIN.IIANCPE_rR0LEUMGEOLOGYDec.2014随钻测量钻井液脉冲传输理论中幂律流体水击方程的建立张忠志,刘涛(1.中国石油集团西部钻探工程有限公司,乌鲁木齐83001l;2.东北石油大学石油工程学院,黑龙江大庆163318;3.中国石油大学地球物理与信息工程学院油气资源与勘探国家重点实验室,北京102249)摘要:针对随钻测量(MWD)系统中钻井液脉冲信号传输方式存在的问题,依据流体力学原理,深入开展了MWD信号传输系统非牛顿流体水击
2、问题基础理论研究。提出了一种线性化处理方法和幂律流体微分黏度近似表达式,建立了幂律流体瞬变流扰动量的变系数线性动量平衡方程,在此基础上建立了幂律流体水击方程。幂律流体瞬变流不仅取决于流体性质,而且还取决于其稳定流流动状态;方程中的变系数揭示了牛顿流体瞬变流与非牛顿流体瞬变流的主要区别。该方程的理论创新之处在于,一是考虑了非牛顿流体的影响,二是没有采用Darcy—Weisbach经验系数计算,而是进行了严格的解析解。关键词:随钻测量;钻井液脉冲;信号传输;幂律流体;水击方程文章编号:1001—3873(2014)06—068
3、4—06中图分类号:TE21文献标识码:AEstablishmentofNovelWaterhammerEquationsforPower—LawFluidsInsidePipeinMWDDrillingFluidPulseSignalTransmissionSystemZHANGZhongzhi.LIUTao(1.XibuDrillingEngineeringCo.,Ltd.,CNPC,Urumqi,Xinjiang830011,China;2.CollegeofPetroleumEngineering,Northeas
4、tPetroleumUniversity,Daqing,Heilongjiang163318,China;3.StateKeyLaboratoryofPetroleumResourceandProspecting.CollegeofGeophysicsandInformationEngineering,ChinaUniversityofPetroleum,Beijing102249,China1Abstract:Thispaperdealswiththepulsesignaltransmissionmodefordrill
5、ingfluidsinmeasurementwhiledrilling(MWD)systems.Ae—cordingtothefluidmechanicsprinciples,thefundamentalstudyonthewaterhammerproblemofnon—Newtonianfluidsinthesignaltrans—missionsystemofMWDwasdeeplyinvestigated.Alinearprocessingmethodandapproximateexpressionofthediff
6、erentialviscosityforpower—lawfluidswereproposed.Thelinearmomentumbalanceequationswithvariablecoeficientsfortheperturbedvariablesoftransientflowofpower—lawfluidswerepresented.Onthebasisofthis,thewaterhammerequationsofthepower—lawfluidsweresetup.Theresultsshowedthat
7、thesolutionsoftransientflowproblemsforpower—lawfluidsarenotonlyrelatedtothefluidsnature,butalsodependedonflow—ingstateofsteadyflows.ThevariablecoefficientsoftheequationsshowedthemaindifferencebetweenNewtonianandnon—Newtonianflu—idstransientflow.Inthispaper,thehigh
8、lightsofwaterhammerequationsforpower—lawfluidscomparedtotheexistingtheoriescanbesum—marized:thestudyconsidersthebehaviorofthenon—Newtonianfluids,andthes
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