Synthesis and properties of AA-AM-SBMA terpolymer thickener
A low damage ternary copolymer thickener AA-AM-SBMA for fracturing was synthesized by a-queous solution polymerization using acrylic acid(AA),acrylamide(AM),and amphoteric monomer methacrylethyl sulfobetaine(SBMA)as the main raw materials,with ammonium persulfate sodium bisul-fite as the initiator system.The structure of AA-AM-SBMA was characterized by infrared spectroscopy,nu-clear magnetic resonance hydrogen spectroscopy,scanning electron microscopy,etc.The result showed that when prepared with injected water at 35℃,the viscosity and suspension properties of AA-AM-SBMA were comparable to those of partially hydrolyzed polyacrylamide(HPAM);when the concentration of sodi-um chloride in the mixing water was greater than 3 000 mg/L,AA-AM-SBMA could exhibit strong salt re-sistance;when the concentration of sodium chloride in the preparation water was6 000 mg/L,the apparent viscosity of AA-AM-SBMA solution at 3 000 mg/L was 58.4%higher than that of HPAM solution under the same conditions.The degradation rate of AA-AM-SBMA at 120℃for 2 h were 95.13%,which were 3.19%higher than that of HPAM under the same conditions.The results of core permeability recovery rate measurement showed that the permeability recovery rate corresponding to AA-AM-SBMA was 95.27%,4.52%higher than that of HPAM under the same conditions,indicating that the introduction of SBMA was beneficial for reducing the damage of thickeners to core permeability.
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