单位代码:10615西南石油大学工程硕士学位论文论文题目:塔河原油外输管线腐蚀机理研究摘要塔河油田自1997年投入开发以来,已建原油处理规模能力530×104t/a,建成联合站3座,重质原油外输首站及末站各1座,原油外输管线179km,满足了油田生产的需要。此管线自建成投产以来未进行过有关重质原油外输管道内腐蚀速率方面的试验,对于管线的腐蚀状况和腐蚀机理不是十分清楚。本文采用实验室挂片法,分析了不同温度、时间、含水量等因素对外输管线的腐蚀影响规律,利用电子显微扫描、X射线衍射及电子能谱、俄歇电子能谱(AES)分析等方法完成了腐蚀形态、特征和形成机理分析,腐蚀产物主要成分为Fe、S、O、C、Cl,主要为Fe2O3同时含有一定量的FeS、NaCl。同时采用CORR-CP失重挂片装置在705、首站和三联进行了在线挂片失重实验,确定了705站、首站、三联的腐蚀速率。采用非线性回归方法建立了现有工况条件下平均腐蚀速率预测公式.02456.00539xy,利用该式可以预测不同时间下管道腐蚀速率和腐蚀程度。根据实验研究和腐蚀影响因素分析结果,在合理控制运行工况参数的前提下,针对性地提出了缓蚀剂+电阻探针的腐蚀缓解及控制措施,缓蚀剂的缓蚀率在85%以上能有效降低管道腐蚀速率,保证了管线的安全运行和生产。关键词:重质原油;腐蚀机理;腐蚀形态;腐蚀速率;缓蚀剂AbstractTaheOilfieldhasbeendevotedtoitsdevelopmentsince1997,hasbuiltthescaleofcrudeoilprocessingcapacityof530×104t/a,withthreejointstations,onefirstandterminalstationand179kmlongdistancepipeline,tomeettheoilproduction.Sincethecompletionofthispipelinehasnotbeenputintotheheavycrudeoiltransmissionpipelinecorrosionrateoutsidethepilotareaforthepipelinecorrosionandcorrosionmechanismsarenotveryclear.Inthispaper,laboratoryweightlessnessexperimenthanging,analysisofdifferenttemperature,time,watercontentofexternalfactorssuchascorrosionofpipelinesinfluenceoftheuseofscanningelectronmicroscopy,X-raydiffractionandelectronspectroscopy,Augerelectronspectroscopy(AES)analysismethodssuchasthecompletionofthecorrosionmorphology,characteristicsandformationmechanismanalysisofthecorrosionproductsmainlycomposedofFe,S,O,C,Cl,mainlyFe2O3alsocontainacertainamountofFeS,NaCl.AtthesametimeusingCORR-CPweightlessnesshangingpieceinstalledin705,thefirststopandtriplehangingpieceforanonlineweightlossexperimenttodeterminethe705stations,thefirststop,triplethecorrosionrate.Usingnon-linearregressionmethodtoestablishtheexistingconditionsundertheconditionsoftheaveragecorrosionratepredictionequation.02456.00539xy,usingthetypecanbepredictedunderdifferenttimeandthecorrosionrateofpipelinecorrosion.Basedonexperimentalstudiesandcorrosionanalysisofinfluencingfactors,inthereasonablecontrolparametersofoperatingconditions,underthepremiseputforwardspecificinhibitor+corrosionresistanceprobemitigationandcontrolmeasures,corrosioninhibitionrateof85%abovecaneffectivelyreducethecorrosionrateofpipelinetoensurethesafeoperationofpipelinesandproduction.Keywords:heavycrudeoil;corrosionmechanism;corrosionmorphology;corrosionrate;inhibitor目录摘要Error:ReferencesourcenotfoundAbstractError:Referencesourcenotfound1绪论11.1目的及意义11.1.1研究背景11.1.2研究的目的与意义31.2国内外现状41.3技术路线及主要内容62室内与现场挂片失重实验研究72.1室内挂片失重实验72.1.1试验对象72.1.2仪器设备82.1.3试验方法82.1.4腐蚀试验92.1.5试验结果132.1.6室内试验结论282.2现场在线挂片失重试验分析292.2.1腐蚀速率302.2.2宏观分析312.2.3金相分析322.2.4扫描电镜分析332.2.5X射线衍射(XRD)分析342.2.6X射线光电子能谱(XPS)分析352.2.7俄歇电子能谱(AES)分析382.2.8动态腐蚀试验结论382.3腐蚀速率预测393重质原油外输...