胶凝原油启动压力衰减特性分析

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1、StudyonthePropertiesofStartupPressureAttenuationforGelledC!rudeOilHaoXihui(Oil&GasStorageandTransportationEngineering)DirectedbyProf．ZhangGuozhongAbstractTheobjectiveofthispaperwhichisbasedontheexperimentswhichmakeuseofTheModelLoop-lineTestApparatusisto

2、studythestartuppressureunderdifferentpipelengthsandthestartuppressuretransmissionandattenuationpropertiesofNanYangcrudeoilwitllrate-controlledandpressure—controlledtests．Thestartuppressuretransmittingspeedwithtwokindsofstart-upmethodsandcompressibilityo

3、fthegelledcrudeoilaleresearchedaswell．Thestudyfindsthat：1．Fortherate—controlledrestarttestsoftheopentypepipeline，thestartuppressureunderdifferentpipelengthsincreaseswiththepipelengthsandtherestartflowrateboostingandthestartuptemperaturereducing．Whenthes

4、tartuptemperatureis40"(2andtherestartflowrateis9．2mL／s，thestartuppressuredistributionalongtheloopappearslinearapproximately．2．Fortherate—controlledpipelinerestarttests，thepressureandtimedifferencesandthepressuregradientbetweentheadjacentoilpressuresenso

5、rsalongtheloopincreasewiththestartuptemperaturedecreasing，andtheincreasingspeedisfaster．Also，thetemperaturepointofoilrheologybehaviorvariationexists．namelythepressuredifferenceofeachadjacentoilpressuresensorwillincreasemarkedly．3．Comparingtherate—contro

6、lledrestartteststothepressure-controlledrestarttests，wecanfindthatincreasingpressurewithinasecondofeachadjacentoilpressuresensorsalongtheloopappearsincreaseswiththerestartflowrateandthestartuppressureraising．However，thestaltuptemperatureproducedifferent

7、results．Becausethepressuredifferenceisthemajorfactorintherate-controlledrestarttestsandthetimedifferenceisthemajorfactorinthepressure—controlledrestarttests．4．Intheprocessofrate-controlledandpressure—controlledrestarttests．thepipepressurereducesalongthe

8、loopandappearslinearapproximately．Thelowerthestartuptemperatureis，thelargerthepressureattenuationwillbeandthefastertheattenuationspeedis．Butthestartupflowrateproduceoppositeeffects．Besides，thehigherthepressureis，thesharperthecurv