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Prepared for use as a blocking agent, acidified steering agent hydrogel, to study the role of the cationic hydrogel and polyacrylamide composite : (1) Through AM homopolymerization AM with the AMPS copolymer and AM DMDAAC synthesized by copolymerization polyacrylamide hydrogel , AM - AMPS hydrogel , and AM-DMDAAC hydrogel. The initiator , monomer mass ratio , a crosslinking agent , filler, etc. to the hydrogel performance , the obtained optimum conditions of synthesis of the three hydrogel . The evaluation showed that the best overall performance of the AM -AMPS hydrogel , hydrogel AM-DMDAAC showed better anti- calcium salt . (2 ) based on the characteristics of the ester group-containing crosslinking agents may be disconnected in the acid hydrolysis , the first AM, AMPS and PEGDA copolymer, synthesized by the acid in the first expansion , after dissolving the reversible diversion agent , The conditions of synthesis : the monomers AM and AMPS molar ratio of 1:1 , the monomer concentration is 25% , the initiator content is 0.1% , the crosslinking agent mass fraction of 0.1% . The diverting agent of the hydrogel in a 15 % hydrochloric acid solution of 90 ° C , the liquid absorbing expansion , expansion in multiples of up to 18 times , and can be dissolved within 12h , play a temporary blockage formation effect . ( 3 ) the the cationic hydrogel solution HPAM complex dubbed composite polymers , evaluation Tackifying , temperature, salinity and shear resistance . The results show that the cationic hydrogel solution added can be improved HPAM viscosity of the solution , when the cationic degree of 5%, the same as the mass fraction of the two solutions , the volume ratio of 1:1 , the best thickening effect at a shear rate 170s -1 the viscosity by 31.1mPa.s to 40.5mPa.s.
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