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

CHENG Shao-ling;HUANG Chun-long;ZHANG Ya-pei;WU Zhen;QU Zhi-hui;College of Science,Tianjin University of Science and Technology;College of Materials Science and Chemical Engineering,Tianjin University of Science and Technology;Jilin Songyuan Petroleum and Chemical Corporation;  
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.
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