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1、识别油气井径向流选层提高老井重复压裂措施效果对油田的可持续发展变得尤为重要。基础井网压裂井数比例达86.76%，压裂厚度达74.5%；压裂投产后油气井的生产特征一般分为3个阶段。Improvetheeffectofoldwellrepeatedfracturingmeasuresforthesustainabledevelopmentoftheoilfieldisparticularlyimportant.Basicwellpatternfracturingwellnumberproportionrea
2、ches86.76%,thethicknessofthefracturingwas74.5%;Fracturingofoilandgaswellproductioncharacteristicsaftertheproductionofgeneralisdividedintothreestages. （1）线型流阶段。此阶段原油从支撑裂缝前缘流向井筒，为压后高产阶段，不过产量下降较快。(1)linearflowphase.Atthisstageofcrudeoilisflowingfromsupport
3、crackfrontshaft,forhighyieldafterpressurestage,butthedeclineinoutputquickly. （2）拟径向流阶段。此阶段原油一方面从支撑裂缝前缘流向井筒，另一方面也从裂缝两侧基岩流入井筒。此时产量已低于第一阶段产量，但生产能力仍高于油层未经过压裂改造前的产量，此阶段产量较稳定。(2)thephaseofquasiradialflow.Thisstageofcrudeoilisflowingfromsupportcrackfrontshafto
4、nonehand,ontheotherhandalsoonbothsidesofthebedrockfromthecracksintothewellbore.Productionatthispointisbelowthefirststageofproduction,butproductioncapacityisstillhigherthanbeforeafterfracturingoillayeroftheproduction,theoutputofthisstageisrelativelystable
5、. （3）径向流阶段。此阶段支撑裂缝已失去了高导流能力，生产能力已恢复到压前水平。压裂井经过线型流、拟径向流直至径向流，增产期即告结束，此时，原油处于经济生产下限，应考虑重复压裂。(3)theradialflowstage.Thisstagetosupportcrackshaslosthighflowconductivity,productioncapacityhasbeenrestoredtothefrontofthepressurelevel.FracturingWellsafterlinearf
6、low,quasiradialflowandradialflow,productionperiodiscometoanend,atthispoint,thecrudeoilintheeconomiclimitproduction,repeatedfracturingshouldbeconsidered.支撑剂镶嵌到裂缝壁面，减小了裂缝宽度，使导流能力下降，其影响达到20%以上；同时对裂缝壁面产生压实作用，加大了地层流体进入裂缝的渗流阻力； 以往原缝重复层压裂措施有效率为40%左右，有效井压后初期平均单井
7、日增油仅为平均压裂井增油效果的1/3，平均有效期只有3个月。Proppantinlaidintothecracksinthewall,decreasethecrackwidth,thediversionabilitydrops,itsinfluencetoover20%;Compactiononthecracksinthewallatthesametime,increasedtheformationfluidintothefractureseepageresistance;Beforetheorigin
8、alseamduplicatelayerfracturingmeasureseffectiveratewas40%,effectiveaftertheinitialgrowingonaveragesinglewelloilwellpressurewasonlyaboutonethirdoftheaverageincrementofoilfracturingwell,meanisonlyvalidfor3months.压裂选井选层不合理。对井
