首页|Syntheses and properties of associative acrylamide copolymers containing short hydrophobic chains used in a friction reducer for slick-water fracturing
Syntheses and properties of associative acrylamide copolymers containing short hydrophobic chains used in a friction reducer for slick-water fracturing
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Two allyldimethylalkyl quaternary ammonium salt(AQAS)monomers,N,N-dimethylallylphenylpropy-lammonium bromide(AQAS1)and N,N-dimethylallylnonylammonium bromide(AQAS2),were synthe-sized and used to prepare modified polyacrylamide materials.Two new drag reducers were synthesized from acrylamide(AM),sodium acrylate(NaAA)and a cationic modified monomer(AQAS1 or AQAS2)via aqueous solution polymerization,and the copolymers were named P(AM/NaAA/AQAS1)and P(AM/NaAA/AQAS2),respectively.The structures of the drag reduction agents were confirmed by IR and 1H NMR spectroscopies.The molecular weight(Mw)of P(AM/NaAA/AQAS1)was 1.79 × 106 g/mol.When the copolymer concentration was 1000 mg/L and the flow rate was 45 L/min,in fresh water the highest drag reduction rate was 75.8％,in 10,000 mg/L NaCl solution the drag reduction rate decreased to 72.9％.The molecular weight of P(AM/NaAA/AQAS2)was 3.17 × 106 g/mol.When the copolymer concentration was 500 mg/L and the flow rate was 45 L/min,the drag reduction rate reached 75.2％,and in 10,000 mg/L NaCl solution the drag reduction rate was 73.3％,decreased by approximately 1.9％.The drag reduction rate for partially hydrolyzed polyacrylamide(HPAM)was also investigated,and the results showed that the drag reduction rates for 500 and 1000 mg/L HPAM solutions were merely 43.2％and 49.0％in brine,respec-tively.Compared with HPAM,both of the above copolymers presented better drag reduction capacities.
College of Chemistry and Chemical Engineering Chongqing University of Science and Technology,Chongqing,401331,China
College of Ecology and Environment,Chongqing Resources and Environmental Protection of University,Chongqing,401331,China
College of Chemistry and Chemical Engineering,Chongqing University of Science and Technology,Chongqing 401331,China
China Property Project Department of Dezhou,Mining Property Service Center,Shengli Oilfield Company of Sinopec,Dezhou,253000,Shandong,China
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScientific and Technological Key Research Program of Chongqing Municipal Education CommissionGeneral Project of Chongqing Natural Science FoundationScience and Technology Research Program of Chongqing Municipal Education Commission
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