井下工程参数随钻测量短接优化和实践

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1、摘要井下随钻测量仪器可以在靠近钻头处实时测量工程参数、地质参数等，能够真实地反映井下实际情况、优化钻井流程，因而在实际钻井作业中得到广泛运用。本文的主要工作包括三部分：测量短接的结构优化、以单片机为核心的硬件电路开发和现场实验。首先介绍了井下工程参数随钻测量短接的整体结构，包括钻铤上的凹槽安置、短接的内部构造和连接、应变片的贴装、电桥的连接等内容。分析了在钻压、扭矩作用下槽内应变片的形变以及电桥的理论输出。然后详述了如何对信号调理电路和单片机电路从硬件和软件两个方面进行改进和调试，完成了对钻压、扭矩信号的放大、滤波、采集、存储和发送等工作。并对仪器的低功耗性能和抗干扰性能等方面进

2、行优化。最后介绍了下井测试和数据分析，测量短接能够满足实际钻井的工况条件，取得了较好的试验效果。为将来分析井下钻头的实际工作情况提供了可靠的测量数据，也为进一步减少和消除井下复杂事故，缩短钻井时间，提高钻井效率奠定了基础。关键词：井下工程参数，随钻测量，钻压、扭矩，应变测量，抗干扰TheOptimizationandPracticeinMWDSubforDownholeEngineeringParameterswangJingsong(ControlScienceandEngineering)DirectedbyProfessorGengYanfengAbstractM陬∞h,s

3、讥珊entscallbeusedtomeasurethednll啦parametersseal-theb吨suchasformationparameters，downholeengineeringparametersetc．inreal—time，SOt11eyareabletotimelyreflecttheactualdrillingsituationandeffectivelyoptimizedrillingtechnology．Consequently，theMW'Dlnsmmaentsarewildlyapplicatedinwelldrillingoperation．

4、overallstructureofthemeasurementsubwasfirstlyintroducedinthethesis，includingtheplacementofpocketsOildrillstring，theinternalconnectionofeachportion，thebondmgmethodofstraingauges，theconnectionofWheatstonebridgeandSOOn．Andthenthethesisanalyzedthedeformationofstraingaugesinthepocketsunderstressof

5、weightandtorqueonbit，andthetheoreticaloutputofWheatstonebridge．Secondly,thethesisexpoundedhowtodesignandimprovetheinstrument,andhowtotestandoptimizetheprocedurefromtwoaspectsofhardwareandsoRware．Sothemeasurementsubcallfinishmanyfunctions，such私amplifying，filtering，sampling，storageandtransferri

6、ngofWOBandTOBsignals．Theoptimizationmainlyelaboratedonlowpowerdissipationandanti—interferencetechnology．Finally,theexperimentOnwellanddataanalysiswereintroduced．ThesatisfactoryresultsshowedthattheMWDsubcanmeettheworkingconditionsanddownholeenvironmentofactualdrilling．Itprovidedreliablemeasure

7、mentdataforanalyzingtheworkingstatusofbit，establishingthefoundationofreducingandeliminatingtheundergroundcomplexitiesandincidents，shorteningthedrillingtimeandincreasingdrillingefficiency．Keywords：DownholeEngineeringParameters；MeasurementWhile