水合物与钻井液相互作用模拟试验分析

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1、SimulatedExperimentalStudyofInteractionbetweenGasHydratesandDrillingFluidCuiQing(Oil&GasWellEngineering)DirectedbyProf：ChengYuanfangAbstractGashydratesaspotentialenergyresources，hasattractedmoreandmoreattentions．Forthegasforminghydrateismainlymethane，itisalsocalledmethanehydrate．Sincethesev

2、ereshortageofenergysupplyandhighgasolineandnaturalgaspriceinrecentyears，manycountriespaymoreattentionstothepotentialenergyofgashydrates，whichhasthepropertiesofhighenergydensity,largereservesandwide-rangedistribution．Theheatgeneratedintheprocessofdrillingandthechangeofphaseequilibriumconditi

3、oncausedbyinhibitorcouldinducethedissociationofgashydrate．Thepropertiesofitsstratadecidethattherewillbemorecomplicatedproblemswhiledrillinginthegashydratestratathaninconventionaloilgas．Theinstabilityofwellandaccidentinthewellcausedbyhydrateformationanddissociationarethemainproblemsofdrillin

4、ginthegashydratestrata．ThesuitabledrillingfluidsWastheessentialparttoobtainsafesustainabledrillingoperationenvironmentandensurethequalityofdrilling．Inthispaper,self-developedhydratetestsystemWasusedtoresearch．Basedonthedomesticandoverseasinvestigation，itusedthetestmethodtomeasurethewavevelo

5、cityofgashydrate．Thetestsystemusedthemethodofconstanttemperatureenvironment．CoolingequipmentusingM190Cfreezingandrefrigeratingmicrocomputercontrolledthecoldstorage．TheequipmentWasplacedinthelowtemperaturecoldstorage．Thecoldstoragecouldprovidelargespaceoflowtemperatureenvironment．Acousticsys

6、temconsistsofsonicprobeandsoundwavestester,itcouldmeasurethesoundspeedofthesimulativehydrateformation．Inthewholeprocess，ultrasonicmethodsweresimultaneouslyusedtomeasuretheverticalwavevelocity．PurenaturalgashydrateWasmixedwithseasandtomakethesedimentsamplesofnaturalgashydrate．Duetothediffere

7、ntdegreeofsaturationhydrate，theinitialwavevelocityWasdifferent．WhenthesaturationofhydrateWas70％，theverticalwavevelocityWas3359m／stestedbyacousticmeter．Whenthesaturationofhydratewas50％，theverticalwavevelocitywas2895m／s．WhenthesaturationofhydrateWas30％，the