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1、摘要潜油电泵采油技术与其他机械采油技术相比，具有运行平稳、排液量大、寿命长、无杆管偏磨问题等优点，潜油电泵采油技术作为提高采油速度和采收率的主要采油方式，在油田生产中发挥着越来越重要的作用。随着油田开发的不断深入，井液含水率增高，腐蚀破坏成为潜油电泵机组损坏的一个重要因素。论文开展了潜油电泵机组腐蚀机理研究，通过对失效井机组进行解剖，总结出腐蚀主要发生在电机壳体外表、分离器壳体和离心泵壳体等位置。发生腐蚀的机理主要有电化学腐蚀、流场诱导腐蚀和磨损冲蚀腐蚀三种。油井产出液矿化度高，尤其是产出液中的Cl-、H2S和CO2等腐蚀性组分含
2、量高的井电化学腐蚀严重，出现点蚀、晶间腐蚀、缝隙腐蚀、垢下腐蚀、全面腐蚀和应力腐蚀等多种腐蚀失效形式。井下套管与潜油电机壳体之间的环空间隙小，油井产出液在此环空处流速较大，出现流场诱导腐蚀。在出砂井上，分离器壳体和潜油电机壳体外表面在含砂粒液体的冲刷下会产生磨损冲蚀腐蚀。针对潜油电泵机组腐蚀破坏的机理，通过改变结构设计、采用新型耐磨材料和涂敷耐腐蚀层等技术，提高了潜油电泵机组的耐腐蚀性能。改进后的电泵机组抗腐蚀性能大幅提高，经大量试验证明，所采取的防腐蚀技术有效延长了检泵周期，现场应用效果良好。关键词：电动潜油泵，腐蚀，冲蚀，治理
3、对策iCorrosionMechanismofElectricSubmersiblePumpsandCountermeasuresHeDongxu(Petroleumandnaturalgasengineering)DirectedbyProf.WangHaiwenAbstractComparedwithothermechanicaloilrecoverytechnology,thetechnologyofsubmersibleelectricpumphastheadvantagesofstableoperation,fluidd
4、eliverylarge,longlifeandnorodandtubinglopsidedwearandsoon.Technologyofelectricsubmersiblepumpiswidelyusedinoilfield,whichisthemainmethodtoenhanceoilrecoveryrateandrecoveryrate,anditplaysanincreasinglyimportantroleinoilfieldproduction.Withthedevelopmentofoilfield,thewa
5、tercutofthewellisincreased,andthecorrosiondamageisanimportantfactorforthedamageoftheelectricsubmersiblepumpunit.Inthispaper,thecorruptionmechanismofthesubmersiblepumpunitisstudied.Throughanalyzingthefailureofthewellsetoftheunit,thecorrosionpositionissummarizedmainlyin
6、themotorshellappearance,theseparatorshellandthecentrifugalpumpshellandsoon.Therearethreemainmechanismsofcorrosion,anditiselectrochemicalcorrosion,flowinducedcorrosionanderosioncorrosion.Thesalinityofoilproducedfluidishigh,especiallyhighcontentintheproductionofCO2,H2Sa
7、ndCl-,whichhasahighelectrochemicalcorrosion.Causingvariousformsofcorrosionfailure:pittingcorrosion,intergranularcorrosion,crevicecorrosion,foulingcorrosion,generalcorrosion,shouldstresscorrosionandsoon.Thespacegapbetweenthecasingandthesubmersiblemotorshellissmall,andt
8、heflowvelocityoftheoutputliquidoftheoilwellislarge,thustheflowinducedcorrosionoccurs.Inasandwell,theseparatorshellandsubmers
