延长油田长2储层采出水回注结垢研究.pdf

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1、第46卷第3期石油与天然气化工CHEMICALENGINEERINGOFOIL&GAS115延长油田长2储层采出水回注结垢研究畅平1张群正1郭王钊1柯从玉1郝西鹏1逯毅21．西安石油大学化学化工学院2．延长油田股份有限责任公司摘要以延长油田长2储层采油厂的采出水为研究对象，采用Scalechem软件对采出水及其与地表水、地层水的配伍进行了结垢预测。结果表明，在地面管线中，』D(BaSO。垢)为176mg／L，J0(CaC0。垢)为540mg／L；在井筒水平段，lD(BaS0。垢)为168mg／L，iD(CaCO。垢)为526mg／L，不符合油田回注

2、水要求。需进行絮凝复配工艺处理，lD(PAC)为60mg／L，10(CPAM)为1．2mg／L，最佳加药间隔为30S，搅拌时间为5min，处理后采出水透光率为88．1％，配伍性较好。采用Scalechem软件进行结垢预测，BaSO。结垢率降低超过750A，CaCO。结垢率降低甚至达到99％，降低了采水负荷，符合油田回注水要求。关键词采油污水絮凝回注结垢预测中图分类号：TE357．6文献标志码：ADOI：10．3969／j．issn．1007—3426．2017．03．023Astudyonproducedwaterscalingduringrein

3、jectionfromChang2reservoirinYanchangOilfieldChangPin91，ZhangQunzhen91，GuoWangzha01，KeCongyul，HaoXipen91，LuYi21．CollegeofChemistryandChemicalEngineering，Xi’anShiyouUniversity，Xi’an，Shaanxi，China2．YanchangOi圻eldCo．，Ltd，Yan'an，Shaanxi，ChinaAbstract：Inthisstudy，takingproducedwater

4、fromoilproductionplantofChang2reservoir，YanchangOilfieldasaresearchobject，scalingpotentialoftheproducedwater，aswellasthecompatibilityofproducedwaterwithsurfacewaterorformationwater，weredeterminedbythesimulationt001Scalechem。TheresultsshowedthatmassfractionofBaS04andCaC03scales

5、inproducedwaterwouldbe176mg／Land540mg／Lrespectivelyinsurfacepipelines，while168mg／LoftheBaS04and526mg／LoftheCaC03waspredictedtogenerateinhorizontalsectiondownhole，failingtomeettherequirementsofwaterreinjectioninoilfields．Thus，itwasnecessarytotreatthewaterwithcoagulation／floccuI

6、ationprocess．TheoptimumoperationparameterswereidentifiedtobewithPACdosageat60mg／L，CPAMdosageat1．2mg／L，theintervaltimebetweentheabovetwochemicalswas30S，andmixingtimeforfloceulationwas5min．Lighttransmittanceofthetreatedproducedwaterwas88．1％withbettercompatibility．AccordingtoScal

7、echemsimulation，massfractionofBaSO4scalingwasreducedmorethan75％，whileCaC03scalingwasreducedalmost99％inreconciledwateraftertreatment．Theproposedtreatmentwasprovedtodecreasethewaterproductionloadandsatisfywiththewaterreinjectionrequirementsinoilfield．Keywords：oilwastewater，flocc

8、ulation，reinjection，scaleprediction基金项目：西安石油大学国家级大学生创新创业训练计划项