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摘要目前国内陆上油田的中低渗透储层占有较大比例,而且不少油井处于大量出水阶段,仅采用机械堵水法己不能满足要求,需要借助化学堵水法并开发新型堵水剂,因此研究凝胶堵水剂对于提高这些油井的原油采收率和经济效益就具有重要现实意义。以丙烯酸、丙烯酞胺为原料,过硫酸钾一无水亚硫酸钠为引发体系,用瞬时聚合法合成了一种相对分子量较低的丙烯酸一丙烯酞胺共聚物,考察了引发剂用量、引发剂配比和单体配比对产物特性粘数、分子量、固含量、溶解度的影响,结果表明:随着引发剂的用量和配比增大,分子量逐渐减小、固含量有所升高,但其用量或配比过大时产物的溶解性反而降低;分子量随单体配比(AA/AM)的变化出现先减小再增大的趋势,而固含量和溶解度则相反。经综合分析,确定了该共聚物的适宜合成条件为:温度为260C,51发剂用量(K2S208占单体重)为1.0%wt,引发剂配比((Na2s03/K2S208)为0.8,单体配比(AA/AM)为1:1.2。该条件下,共聚物的特性粘数为1.2X103mL/g,粘均分子量约8.3X10'.FT1R分析显示该共聚物在3448cm-’处有轻基伸缩振动吸收峰、1652cm’有酞胺基不对称伸缩振动吸收峰。以丙烯酸一丙烯酞胺共聚物为成胶剂、六亚甲基四胺和乙酸苯min-E3为交联体系制备了凝胶堵水剂,在30℃的地层水中吸水24h,利用正交试验法获得凝胶的较佳配方为:共聚物用量为9%wt,六亚甲基四胺为0.7%wt,乙酸苯酷为0.6%wt,该配方下凝胶吸水倍率为37.0lg/g。进而讨论了凝胶堵水剂的基木性能和主要应用性能,得出:80℃下凝胶成胶后较长时间内凝胶强度处于F-J级,国内外的目测凝胶码有一定对应关系;在地层水中,80℃前凝胶的吸水倍率随温度几乎呈直线上升,在800C,24h内吸水倍率达74.55g/g;在30℃下,48h内凝胶在蒸馏水、地层水、0.5%wtNaCl水溶液中的吸水倍率分别为98.94g/g,23.87g/g,19.14g/g,而在0.5%wtCaCl:水溶液中吸水倍率仅2.42g/g;凝胶放置于80℃地层水中,第1天的吸水倍率达63.80g/g,三天后趋于85.26g/g,在轻质原油中凝胶会脱水,放置4天后脱水率达30.84%并变化缓慢。此外,用SEM观察凝胶得知其吸水后出现孔洞及通孔,TG测试得到凝胶失重开始温度约为890C。岩心驱替实验表明凝胶对低渗透岩心的封堵率为81.95%。今后应改进该凝胶堵水剂在高矿化度地层水中的吸水性和在低渗透地层中的注入性,以使其有更好的封堵效果。关键词:丙烯酸一丙烯酞胺共聚物;凝胶;堵水剂;吸水倍率:岩心驱替实验AbstractNowadays,lowpermeabilityreservoirstakeagreatamountamongdomesticonshoreoilfields,andwithamassofwaterbreakthrough,justusingmechanicalwatershutoffcan'tmeetthedemands,sothechemicalmethodandnewshut-offagentareessential,thestudyonwatershut-offagenthasapracticalsignificanceforhigherrecoveryandeconomicbenefit.Acrylicacid/acrylamidecopolymerwassynthesizedbyinstantaneouspolymerization,duringtheprocess,acrylicacidandacrylamide(AA/AM)asmainrawmaterials,anhydroussodiumsulfite-potassiumpersulfate伽a2S03/K2S20g)astheinitiatorsystem.Theeffectsofdifferentreactionconditionshadbeenstudiedindetail.Theresultsshowedthatmolecularweightwasdecreasingwiththeincreasingdosageandtheratioofinitiator,butforsolidcontent,onthecontrary,whenbeyondthesomepoint,watersolubilitydropped.Ontheotherside,whenthemonomerratiochanged,themolecularweightdecreasedfirstly,thenincreasedandtheconsequencesofsolidcontentandwatersolubilitywereinoppositeofmolecularweight.Bycomprehensiveanalysis,thesuitablesynthesisconditionswereobtained:dosageofinitiatorwas1.0%wt,theratioofinitiatorwas0.8,themonomerratiowas1:1.2at26C,inthesituation,intrinsicviscositywas1.2X103mL/g,viscositymolecularweightwas8.3X104.FT-11Zwereusedforconfirmingtheexistenceofhydroxylgroupwithstretchingvibrationabsorptionat3448cm一I,aswellasasymmetricstretchingvibrationabsorptionofacylaminogroupat1652cm-I.Gelshut-offagentwasobtainedfromAA-AMcopolymerreactingwithHMTandphenylacetate.Thebefittingconditiontosynthesizegelshut-offagentwhichwasgotbyorthogonaltestat300Cduring24hinformationwaterwas:theconcentrationofcopolymer,HMT,phenylacetateat9%wt,0.7%wt,0.6%wtseparately.Dosageofcopolymerhadagreateffectonwaterabsorption,thewaterabsorptionwas37.01g/ginbetterformula,gelstrengthhadbeeninfluencedbythephenylacetate,thegelstrengthwasinF-Jinanextendedperiodat800C,foreignMarathongelstrengthcodeanddomesticgelstrengthcodewerediscussed.Thebasicpropertiesandmainapplicationperformanceshadbeendiscusseddeeper.Theresultsshowed:at800C,waterabsorptionofgelalmostgrewstraight,andthewaterabsorptionwas74.55g/gin24h.whengelwasindistilledwaterorformationwaterorNaClsolutionat300Cduring48h,waterabsorptionofthegelwere98.94g/g,23.87g/g,19.14g/g,however,inCaC12solutionthepropertyjustwas2.42g/g.Whengelwasinformationwaterat800C,watcrabsorptionchangedwiththestoragetime,inthefirstday,thewaterabsorptiongotto63.80g/g,itwasgraduallystableafterthreedaysto85.26g/g.Andwhengelwasinlightoilatthesametemperature,shrinkagewasbiggerduringthefirstfourdaysat30.84%,afterthatthechanges目录第1章绪论.......................................................................................................................................................11.1研究目的及意义..........................................................................................................................11.2丙烯酸一丙烯酞胺类聚合物国内外研究现状......................................................................11.2.1合成方法研究.....................................................................................................................11.2.2合成机理研究..…,.............................................................................................................41.3聚合物类堵水剂国内外研究现状...........................................................................................41.3.1聚丙烯酞胺一醋酸铬类凝胶体系的研究.......................................................................41.3.2有机交联聚合物凝胶体系的研究..............................................................................51.3.3聚合物类堵水剂相关机理研究..................................................................................61.4研究内容...........................................................................................................................................7第2章丙烯酸一丙烯酞胺共聚物的合成................................................................................................92.1概述..........................................................................................................
本文标题:聚丙烯酰胺类暏水剂的研究
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