复合水凝胶调剖剂P(AM-DMDAAC)CB的制备及性能研究

Preparation and properties of P(AM-DMDAAC)CB composite hydrogel as profile control agent

以丙烯酰胺(AM)、二甲基二烯丙基氯化铵(DMDAAC)为聚合单体,钙基膨润土(CB)为增韧剂,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸铵和亚硫酸氢钠为引发剂,采用水溶液聚合法,合成了一种复合型水凝胶调剖剂P(AM-DMDAAC)/CB.通过SEM和XRD表征了调剖剂的形貌和CB的晶型变化,探讨了反应条件对调剖剂的吸水倍率和压缩强度的影响.得到最佳制备条件为:AM与DMDAAC的质量比为9∶1,MBA用量为0.16%(占单体总质量的比例,下同),CB添加量为100%,引发剂用量(以过硫酸铵质量计,过硫酸铵和亚硫酸氢钠质量比为1∶1)为0.08%,反应温度为55℃.在最佳工艺条件下,与无CB的调剖剂相比,CB增加量为100%时,调剖剂的吸水倍率有所降低,但成本降低了约50%,压缩强度大幅提高.

In this work,a type of composite hydrogel as a profile control agent based on the acrylamide（AM）,diallyl dimethyl ammonium chloride（DMDAAC）,and calcium bentoniteand（CB）is prepared with free radical solution polymerization using ammonium persulfate/sodium bisulfate as a redox initiating pair,and N,N′-methylene-bis-acrylamide（MBA）as a crosslinker.The morphology and the crystal deformation are characterized by SEM and XRD,respectively.The effect of the reaction condition on the swelling capacity and compressive strength of the profile control agent is investigated.The optimum processing technology is obtained as follows：the mass ratio of AM to DMDAAC 9∶1,MBA dose 0.16%（the ratio of the total monomers mass,the same below）,initiator dose（for ammonium persulfate,the mass ratio of ammonium persulfate to sodium bisulfate is 1∶1）0.08%,CB content 100%,and reaction temperature 55℃.Compared to clay-free hydrogel P（AM-DMDAAC）,P（AM-AMPS）/CB（CB addition amount 100%）hydrogel exhibits a better performance：the cost is reduced by about 50% and the compressive strength is enhanced largely,despite the swelling capacity decreases somewhat.