Preparation and performance evaluation of terpolymer viscosity increasing and fluid loss reducing agent
Using acrylamide,acrylic acid,and 2-acrylamido-2-methylpropanesulfonic acid as monomers,and potassium persulfate/sodium bisulfite as initiators,a terpolymer viscosity-increasing filtrate reducer was prepared through aqueous solution polymerization.The effects of solution pH,monomer ratio,reaction temperature and initiator dosage on the intrinsic viscosity of the terpolymer were analyzed through single-factor experiments.The optimum preparation conditions were determined as follows:the pH value of 8,reaction temperature of 35℃,monomer ratio m(AM)∶m(AA)∶m(AMPS)of 65∶10∶25 and initiator dosage of 0.010%,the resulting product intrinsic viscosity was 7.8dL·g-1.The performance evaluation results demonstrate that the prepared terpolymer exhibits temperature resistance up to 180℃.When 0.5%,1.0%and 1.5%of the terpolymers were added to fresh water-based pulp,salt water-based pulp,and composite salt water-based pulp,respectively,the apparent viscosity retention rates after high-temperature aging reached 71.4%,62.5%and 52.0%,respectively.Additionally,the filtration loss was less than 10.0 mL,indicating excellent viscosity increase and filtration loss reduction as well as temperature-resistant,salt-resistant and calcium-resistant properties.
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