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1、RoleofMicrostructureinSuckerRodStringFailuresinOilWellProductionSofianeBenhaddadandGlenLee(Submitted12December2000;inrevisedform20February2001)Sucker-rodpumpsareoperatinginveryaggressiveenvironmentsinoilwellproduction.Thecombinedeffectofacorrosiveenvironmen
2、tandsignificantmechanicalloadscontributetofrequentcasesoffailureoftherodstringduringoperation.Standardsandrecommendationshavebeendevelopedtocontrolandavoidthosefailures.Thisstudypresentsvariousfailurecasesofsuckerrodsindifferentapplications.Theheattreatment
3、ofthesteelmaterialandtheresultingmicrostructureareanimportantfactorinthebehaviorofthesuckerrod.Aspheroidizedmicrostructurepresentsaweakerresistancetocorrosionaffectingtherodlife.Non-metallicinclusionsareapittingpreferentialsiteleadingtofatiguecrackinitiatio
4、n.Heterogenousmicrostructureasbandedmartensiteandferrite/pearlitedecreasestheductilityofthematerialaffectingthefatiguepropagationresistance.Keywords:corrosion-fatigue,inclusions,pitting,steelmicrostructure,suckerrod1.IntroductionTheoilproductionwellsinweste
5、rnCanadagenerallyoperateinaggressiveenvironments,includingcorrosiveelements,highvelocityofthefluids,andconsiderabledepthforcompletion.Determinationandanalysisofthenecessarydataarerequiredforselectionofmaterialsforwellcomponents.Materialsforthetubing,casing,
6、andsuckerrodstring,aswellasasuitablecoatingorchemicalprotectionprogramareselectedappropriatelyforeachoperatingwell.Insuchanaggressiveenvironment,themostvulnerabledownholecomponentisthesuckerrodstringduetoitsfunction.Specificationsandstandards[1-4]havebeenwr
7、ittenfortheimprovementoftheperformanceandlifeexpectationofsuckerrods.Therecommendationsofthesecodesandstandardsaredirectedtowardsabetterchoiceofmaterialforgoodcorrosionresistanceandabetterdesignoftherodstringforanevendistributionofstresses.Theresultingrecom
8、mendationsarerestrictiveandmaypaysignificantattentiontoeconomicfactors.Therefore,manyoperatorscontinuetousecarbonoralloysteelcomponentswithanappropriatechemicalinhibitionprogram.Carbonsteelispreferredo
