基于Simulink的钻井信息传输通道特性仿真完善版.doc

基于Simulink的钻井信息传输通道特性仿真张会先,尚海燕,周静(西安石油大学井下测控研究所陕西西安)摘要:为利用钻杆有效地随钻传输地面与井下之间的数据,本文应用声波无缝传输模型将任意钻柱组合分解为单个声波无缝传输模型级联方法,根据某单个典型钻具无缝传输模型系统函数的S参数和声波钻井信道的传输特性,推导了在信道通带内某一频点等效传输函数,在Simulink环境下仿真了该S参数的等效传输函数,并仿真了将双口网络S参数构成单钻具系统函数进行级联构成多个钻具的联接的系统函数。最后根据双口网络参数性质,多钻具级联的系统函数等效为各级T参数的连乘,将S参数转化为T参数,得到多个相同钻杆级联后的模型系统函数特性,仿真结果将对随钻声波传输仪器的方案设计提供有力的技术支持。关键词:钻杆信道;声波传输;S参数;Simulink仿真中图分类号:TE21AcousticalPropertiesStudywithinDrillStringsBasedonSimulinkZHANGHui-xian,SHANGHai-yan,ZHOUJing(InstituteofMeasurementandControlinXi’anShiyouUniversity,Xi’an,China)Abstract:Formakingthedrillpipesworkeffectivelywithoilrigonthetransmissionofdatabetweenwellbottomandthesurface,binationtobesingleAcousticseamlesstransferofmodelcascademethodsbyusingacoustictransmissionmodel,ypicalS-parameterformofdrillseamlesstransferofmodelfunctionandthecharacteristicsofSonicdrillingchannel,whichanalyzesS-parametersofafrequencytransferfunctioninsidetheChannelpassband,imitatingthecharacteristicsofS-parametersundertheenvironmentofSimulinkalongwiththemultipledrillconnectedsystemfunctionswhichcascadedbytheSingledrillsystemfunctionsconstitutedbyDual-workS--workparameters,MultipledrillcascadesystemfunctionsareequivalenttoAlllevelsofTparametermultiplicative,exchangingS-parameterstoT-parameters,thenitwillshowthecharacteristicsofmodelsystemfunctionscascadedbydozensofthesamedrillpipe,eofimitationwillprovi