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1、1ImprovingthequalityofoilwellcementusingsimultaneousfineferrichydroxidegypsumPhD.HongLuuThi1Assoc.prof.PhD.LongLuongDuc2Assoc.prof.PhD.DzungNguyenAnh312.VietnamInstitutefBuildingMaterialsVietnam3.FacultyofSilicateHanoiUn

2、iversityofTechnologyVietnamAbstract:Thispaperpresentsastudyontheeffectoffineferrichydroxidegypsumonthepropertiesofoilwellcementslurryhardenedoilwellcementslurryinthetemperatureconditionof750C.Sincefineferrichydroxidewhic

3、hmainlyconsistsofFe(OH)3isintheshapeofsphericalparticlesmicrometersinsizehasgoodabilitytodisperseinwateritimprovestheflexibilityofoilwellcementslurrybyamechanismascalled“dilutionmechanism“.Atthetemperatureof750Ccalciumhy

4、droxidetookchemicalreactionswithfineferrichydroxidegypsum(CaSO4.2H2O)fmingcalciumFerrosulfatethusincreasedthestrengthofthehardenedoilwellcementpaste.Inadditionasimultaneoususeoffineferrichydroxidegypsumcanactivelyadjustt

5、hickeningtimeofslurryenhancethestrengthofhardenedoilwellcementslurryinthewellbe.KeywdOilwellcementCalciumFerroussulfateFeettringiteI.Materialsmethodsusedinstudy1.1.Studymethods1.1.1.Thestardmethodsusedinthestudyareasfoll

6、ows:MethodofdeterminingtheflowabilityofcementslurryinaccdingtoГOCT26798:296(ГOCT–stardofRussia)MethodofdeterminingtheconsistencyofcementpasteinaccdingtoTCVN6017:1995Methodofdeterminingthefreewaterofoilwellcementslurryina

7、ccdingtoAPISpec10A(API–StardofAmericaPetroleumInstitute)MethodofdeterminingthestrengththickeningtimeofoilwellcementslurryinaccdingtoAPISpec10Ahoweverthetestingtemperatureof750CwasappliedinsteadThemethodsofchemicalanalysi

8、saccdingtoVietnamstards:Analysisofcementferrichydroxidelimegypsum.1.1.2.Chemicophysicallyanalyticalmethodsusedinthestudyareasfollows:XRayDiffraction(XRD)methodScanningelectronmicroscope(SEM)method.1.2.Materialsusedinstud

9、yInthisstudythefollowingmaterialswereused:OilwellcementclinkerwhichisinaccdancewithAPISpec10AClassGproducedbyVietnamInstitutefBuildingMaterialsVietnamLaosGypsumFineferrichydroxidewhichwasproducedbyXuanDinhVietnamwatertre

10、atmentplant.1.2.1.OilwellcementclassGMineralchemicalcompositionsaswellasphysicalpropertiesofclinkercementareshowninTable1.1Figure1.11.21contact:tel:084912425751084435580099fax:0844385811123CLKgiaoTTDC11hK32609000300226()

11、BrownmilleritesynCa2(AlFe3)2O5WL:1.5406thhombicPrimitive000381429()CalciumAluminumOxideCa3Al2O6WL:1.5406CubicPrimitive000310301()CalciumSilicateCa3SiO5WL:1.5406TriclinicPrimitive000330302()LarnitesynCa2SiO4WL:1.5406Monoc

12、linicPrimitiveOperations:Smooth0.048|ImptCLKgiaoTTDC11hK32609File:CLKgiaoTTDC11hK32509.rawType:2ThThlockedStart:10.000End:55.000Step:0.030Steptime:1.sTemp.:25C(Room)TimeStarted:1Lin(Cps)01002003004005006002ThetaScale1020

13、304050d=7.30545d=5.94740d=3.87446d=3.19172d=3.03571d=2.97030d=2.89074d=2.77828d=2.74829d=2.69864d=2.64695d=2.60868d=2.44848d=2.32367d=2.18519d=2.16970d=2.10110d=1.97869d=1.93552d=1.92084d=1.76742Figure1.1.ThediagramXRayD

14、iffractionofclinkerFigure1.2.SEMofclinker1.2.2.GypsumlimeThechemicalcompositionsofgypsumlimeareshownintable1.2.Table1.2ChemicalcomponentsofgypsumlimeMaterialsOxidecontents.%byweightL.O.ISiO2Al2O3Fe2O3CaOMgOSO3Lime7.820.1

15、20.030.0890.371.120.18Gypsum21.842.000.360.0532.160.5042.601.2.3.FineferrichydroxideChemicalmineralcompositionsoffineferrichydroxideareshownintable1.3Figure1.3respectively.Table1.3Chemicalconstituentsoffineferrichydroxid

16、eMaterialOxidecontents%byweightMKNSiO2Al2O3Fe2O3CaOMgOSO3Ferrichydroxide(PGF)14.162.10.881.030.20.30.01Fe.chiHongXMBT010872096(C)QuartzSiO2WL:1.5406HexagonalPrimitive000170536(D)GoethiteFe3O(OH)WL:1.5406thhombicPrimitive

17、Operations:Smooth0.066|ImptFeFile:FechiHongXMBT.rawType:2ThThlockedStart:5.000End:55.010Step:0.030Steptime:1.sTemp.:25C(Room)TimeStarted:1261552768s2Theta:5.000Theta:2.500DisplaLin(Cps)01002003004005002ThetaScale10203040

18、50d=4.25310d=3.34348d=2.23628Figure1.3.ThediagramXRayDiffractionofferrichydroxideAnalysisresultsofchemicalmineralcompositionofferrichydroxide(Table1.3Figure1.3)haveshownthatthemaincompositionofferrichydroxidewasamphousph

19、ase.InadditionferrichydroxideconsistsofSiO2quartzaswell.ParticlesizedistributionofferrichydroxidewasdeterminedbytheequipmentCoulterLSParticlesizeAnalyzer3.00.40.Particlesizedistributionisshownintable1.4figure1.4.Analysis

20、resultindicatesparticlesinthesizerangefrom0.1?mto10?mtoholdof95%volumemostofparticlesaresphereparticlessmallerthan1?m.MostofparticlesareflocculatedsmallparticlesthatisshownonSEMresultwithmagnificationof20.000times(figure

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