电磁波随钻测量干扰信号消除算法研究.pdf

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1、第35卷第9期仪器仪表学报V01．35No．92014年9月ChineseJournalofScientificInstrumentSep．2014电磁波随钻测量干扰信号消除算法研究术龙玲，陈庆，刘飞(1．西南民族大学电气信息工程学院成都610041；2．中国地质大学(武汉)构造与油气资源教育部重点实验室武汉430074；3．华中科技大学电气与电子工程学院武汉430074；4．川庆钻探工程有限公司钻采工程技术研究院广汉618300)摘要：电磁波随钻测量(EM．MWD)是一种以电磁波形式实现地层传输的无线随钻测量技术，对井场随钻测

2、量实测的信号噪声进行分析，发现接收噪声中的主要干扰成分是来自工频的谐波干扰。为消除工频信号对于地面接收到的随钻测量信号的干扰，提出了一种基于正弦波参数估计的谐波干扰消除算法。该算法首先对干扰谐波参数进行估计，然后重构干扰谐波信号，并从接收信号中减去干扰信号，该过程迭代进行，直到接收信号中有效信号能量占到50％以上。经过仿真测试和实际实验验证，该方法有效的消除谐波干扰，最大程度上减小了有效信号的失真，并大大地提高了接收信号的信噪比。关键词：电磁波随钻测量；正弦波参数估计；谐波干扰中图分类号：TP29TN98TH89文献标识码：A国

3、家标准学科分类代码：510．99ResearchoneliminatinginterferencesignalalgorithmofEM-MWDLongLing，ChenQing一，LiuFei(J．CollegeofElectrical&InformationEngineering，SouthwestUnivemi~forNationalities，Chengdu610041，China；2．KeyLaboratoryofTectonicsandPetroleumResources，Min~tryofEducation，Chi

4、naUnwemityofGeosciences，Wuhan钌DD，China；3．SchoolofElec—tricalandElectronicEngineering，HuazhongUniversityofScienceandTechnology，Wuhan钳DD74，China；4．DrillingandProductionTechnologyResearchInstitute，ChuanqingDrillingEngineeringCo．，Ltd．，CNPC，Guanghan618300，China)Abstract：E

5、lectromagneticmeasurementwhiledrilling(EM—MWD)isakindofwirelessmeasurementwhiledrillingwithelectromagneticwave．Thenoiseinthemeasuredwel1．sitesignaliSanalyzed．andtheanalysisresultindicatesthatthemaindisturbancefactorinthere—ceivednoiseistheharmonicinterferencefromthep

6、owerfrequency．InordertoeliminatetheinterferencetothesignalofEM-MWD，thispaperexploresaharmonicinterferenceeliminationapproachbasedonsine—waveparameterestimation．Thismethodfirstestimatestheharmonicinterferenceparameters，andthenrestructurestheharmonicinterferencesignal，

7、andthereconstructedharmonicinterferencesignalissubtractedfromthereceivedsignal；thisprocessisperformediterativelyuntiltheefectivesignalenergyreachesmorethan50％inthereceivedsigna1．Simulationtestandactualexperimentwereconducted，theresultsshowthatthisapproachefectivelyel

8、iminatestheharmonicinterference，minimizesthedistortionoftheeffectivesignal，andgreatlyimprovesthesignaltonoiseratioofthereceivedsign