电化学预氧化技术在油田污水处理中研究与应用

·-22Cl2eCl2+3+-22Fe+HOFe+OH+OH2+3+-Fe+OHFe+OH2S2Se22H2He233HCOHCO223COHOHCOHRTZFCkRTZFCkZFAisRbsaxfexpexpiZFAfkbksaxCsRC1RTx≤μResearchandApplicationofElectrochemicalPreoxidationTechnologyinOilfieldWastewaterTreatmentCUIZhi-jian1ZHOUJia-ming2YANGTao-tao1CollegeofPetroleumEngineering,Xi’anShiyouUniversity,ShaanxiXi’an710065China2.InternationalDivisionofChinaPetroleumPipelineBureau,CNPC,HebeiLangfang065000ChinaAbstract:Oilfieldproducedliquidsewagetreatmentisthekeytowaterinjectionproduction.Thewaterqualityanalysisshowsthattheoilfieldproducedliquidhasthecharacteristicsofhighsalinity,highironcontent,lowCO2contentandlowPHvalue,itswaterqualityisextremelyunstable,andhasstrongcorrosive.Theelectrochemicalwatertreatmenttechnologyistousesewage’shighsalinitytoelectrolyticallyproduce·OHandO,H2O2,Cl2(ClO-)strongoxidizingsubstanceswhichcankillbacteria,andoxidizeFe2+andS-ionstoFe3+andStoberemovedbyprecipitation,sotheaveragecorrosionratereduceto0.031mm/a.Inthispaper,combinedwiththeactualoilfieldproduction,thenewelectrochemicalpreoxidationprocessforsewagetreatmentwasdesigned;on-sitetestobtainedsatisfactoryeffect.Themechanismofelectrochemicalpreoxidationtechnologyanddesignofthenewtechnologicalprocessforoilfieldsewagetreatmentcanprovideareferenceforotheroilfieldenterprises.Keywords:electrochemicaloxidation;preoxidation;sewagetreatment;corrosionrateStudyonSedimentaryMicrofaciesofYanchangFormationChang8ReservoirinFanxueDistrict,NorthwesternOrdosBasinZHANGPeng1,DANGHai-long1,CAOYu-shan1,WANGTao1,KANGSheng-song1,ZHAOPeng-fei1YanchangPetroleum(Group)Co.,Ltd.ResearchInstitute,ShaanxiXi’an710075,ChinaAbstract:TheoilsandofChang8reservoirofYanchangformationinFanxuedistrict,northwesternOrdosbasinistaupefine,fine-grainedfeldspathicsandstone,grainsizeprobabilityiscurvetwo-stageformandpartialthree-partform.Combinedwithsedimentationinthestudyarea,diagenesisandindividualwell-phaseanalysis,it’spointedoutthatChang8reservoirisdeltafrontfaciesoflakedeltadepositionalsystem,theprovenanceofthenorthornortheastdirectionfrommainlydevelopedunderwaterdistributarychannel,riversideedge,splitbetweenbaymicrofacies.Loggingcurveshapeisbox,bell-shapedandtheircombination,whichreflectsthemicrounderwaterdistributarychanneldevelopment,sandbodieswerestackedonaseriesofcyclesrepeatedcross-section,formedflatconvexlensontheprofilebody.Invertical,thereisacoarsening-upwardsequence,whichindicatesthescopeofthestudyareasedimentarybasinexpandedtoconstitutedeltaicsediments.Keywords:Fanxueoilregion;Yanchangformation;lakedelta;sedimentarymicrofacies;deltafrontfacies