Development of AMPS/DMAEMA/AM terpolymer drilling fluid filter loss reduction agent
The PAAD filter loss depressants were prepared by aqueous solution polymerization using acryl-amide,2-acrylamido-2-methylpropanesulfonic acid and dimethylaminoethyl methacrylate as the monomers and ammonium persulfate as the initiator,and the preparation process was optimized by a one-factor test,and the temperature and salt resistance of the filter loss depressants were investigated.The results showed that under the optimal conditions of acrylamide,2-acrylamido-2-methylpropanesulfonic acid and dimethyl-aminoethyl methacrylate in the mass ratio of 4∶2∶0.02,the reaction temperature of 60℃,the reaction time of 4 h,and the dosage of ammonium persulfate of 0.15%of the mass of the mixed monomer,the fil-ter-loss reducing agent prepared was the best in terms of the filter-loss reducing effect,and the resistance to the temperature reached 210℃.
filter loss reducertemperature and salt resistancedrilling fluids
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