ExperimentalevaluationofthepluggingeffectofpermanentlyabandonedwellsZHONGShou-ming1，DENGKuan-hai2，WUYan-xian1，ZHANGHao1，ZHAOQian2，LINYuan-hua2(1EngineeringTechnologyＲesearchInstitute，XinjiangOilfieldCompany，Karamay834099，Xinjiang，China;2StateKeyLaboratoryofOilandGasＲeservoirGeologyandDevelopmentEngineering，SouthwestPetroleumUniversity，Chengdu610500，China)Abstract:Withthecontinuousdevelopmentofoilandgasresources，thereareincreasingabandonedoilandgaswellswithnocommercialexploitationvalue．Thepluggingeffectofabandonedwellsisthekeytopermanentlymaintainingtheintegrityofthewellbore．Therefore，basedonthecharacteristicsofpermanentlyabandonedwellsandpluggingtechnicalspecificationsandrequirements，amethodfortestingandevaluatingthepluggingeffectofpluggingbarrierunitsinpermanentlyabandonedwellsisproposed．WeindependentlydevelopedatestsystemtoevaluatetheeffectivenessandfeasibilityofthecementpluginsidethecasingandthecementsheathoutsidethecasingandsimulatedthedownholeworkingconditionsoftypicalwellsinNorthwestChina．Thesealingperformancetestandinterfacemechanicalperformancetestofthecementplugintheabandonedwellsandthecementsheathoutsidethepipeswerecarriedout．Thetestresultsofmaximumpluggingpressureandbreakdownpressureofcementplugandcementsheathunderfoureffectivebondinglengthsandthemechanicalparametersoftheinterfacewithcasingwereobtained．Theinfluenceofthecementplug/thelengthofcementsheathonitssealingperformance，andthefunctionalrelationshipbetweenthecementplug/thelengthofcementsheathandthepluggingpressureareobtainedbyfitting．Theintegrityfailuremechanismunderhydraulicimpactandtheweakareaofthesealingbarrierisclarified．Thesealingperformanceandinterfacemechanicalpropertiesofcementplugandcementsheatharecompared．Theprocessparametersthattheplugginglengthofcementpluginthepipeismorethan22.99mandtheplugginglengthofcementsheathoutsidethepipeismorethan36.92maredefined，forminganeconomicandfeasiblepermanentpluggingprocessforabandonedwells．Theresearchresultscanprovideanimpor...
