超分子凝胶封堵剂及其封堵机制

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中图分类号：TE53 文献标志码：A

Abstract：Inorder tosolvetheproblemof workingfluidlossduring oiland gas drillngand production，asupramoleculargel plugging agent basedon hydrophobicasociation was prepared bymicellar copolymerization method，whichcan beused to plug fracturesand pores inthe formation during oilandgas driling and production.The plugingagent was formedbyfree radical polymerizationof acrylamide，octadecylmethacrylate，sodiumdodecyl sulfateandother monomers.According to the requirements of plugging materials during oiland gasdrilingand production，theforming time，rheology，swelling property， mechanical propertiesand plugging properties of supramolecular gels wereevaluated in laboratory.Theresults show thatthe formingtimeofsupramoleculargel pluggingagent iscontrollable，and ithasexcellent viscoelasticrecoveryabilitywithina certainrange of shear strainand scanning frequency.Thecompressivestress reaches 1.43 MPa when the compresion amount is close to 87% . Meanwhile，supramolecular gel shows good swelling performance，and its swelling process is non-fickian difusiontype.Besides water moleculardiffusion，theswellng processis greatlyaffected bygelnetworkand polymerchain relaxation，interaction between water moleculesand polymer network and polymer network groups，etc.Inadition，supramoleculargel presentsstrong formationbondingability，goodplugingperformance，andthepluggingrateisgreaterthan 95% .Itcan effectivelyreduce lost circulationand improve the plugging efect，and issuitableforlong-term plugging of heterogeneous and malignant lost circulation layers.

Keywords ： supramolecular gel; plugging agent； rheological property; swelling property; plugging effect

油田应用较早的封堵剂为聚丙烯酰胺类，其作用原理是通过注入储层后限制注人水的流动方向，使得液流发生转向进入到未被波及区域，属于一种相对低廉的处理剂[1-2]。（剩余14774字）