基于油套环空声学特性的油井动液面监测技术-研究

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1、山东科技大学硕士学位论文摘要ABSTRACTWellfluidleveldepthknownasthe”thepulseofoil”isanimportantparameterofoilfielddevelopmentandwellmonitored．Currently,dual—channelechoinstrumentiswidelyusedinthewellfluidlevelmeasurementsinactualproduction．Itsprincipleismakinginstantlygeneratenegativehighvoltagepuls

2、easthedetectionsignal，andrangingthroughecho．However,thesoundingdeviceisnotonlyhavingacertainrisk，butalsoCannotmakemultiplecontinuousmeasurements．Therefore，wedesignedallultra-lowfrequencyacousticloggingtoolinthisissue．Theprincipleisthatultra-lowfrequencyelectromagneticspeakeremitsacon

3、tinuousacousticprobe，whichisthemodulatedwithsinechirp．First，thebasicfeaturesandprinciplesofsoundpropagationwithinthetubing-casingannularspacewereanalyzed．Soundtravelswithinthetubing-casingannularspaceinidealandnon—idealconditionoflinearandnonlinearwaveequationsweredescribedbywaveequa

4、tion，aswellasthethree-dimensionalwaveequationincylindricalacousticwaveguide，andsonicreflectionandabsorptionpropertieswereanalyzedtheoretically．Second，thesoundwavepropagationcharacteristicsinavariablecross-sectiontubeandthepropagationcharacteristicsofthefoamsegmentwereanalyzed，andthea

5、cousticwavepropagationcharacteristicsofthefoaminthemodelsegmentweresuccessfullyestablished．Further,wefoundthattheacousticattenuationspeedwasproportionaltothefrequencyintheprocessoftransmission，andwiththeincreaseoffrequency,thecouplingofreflectioncoefficientalsoincreasesgradually,just

6、asthedeeperthewelldepth，highfrequencysignalattenuationondramatically．Eventually,accuratecalculationmethodofthetemperaturegradientwithintheoilcasingannulusWasobtained．Basedonthetheoreticalanalysis，wedesignedthewellfluidlevelmonitoringsystem，developedultra-lowfrequencyacousticloggingto

7、olintermsofhardware，testedfrequencyresponsecurvesoftheultra-lowfrequencyelectromagneticspeaker,andanalyzedtheperformanceofthepipelineinfrasoundsensorsexperimentally．Testsoftwareandsignalanalysissoftwaremonitoringsystemwerewrittentosimulatetheechosignal．Inaddition，twotestsweredoneinoi

8、lfield．There