石油与天然气化工2025，Vol.54Issue(5)：89-97,9.DOI:10.3969/j.issn.1007-3426.2025.05.011
耐盐抗剪切阳离子缔合型共聚物的制备及性能研究
Preparation and properties of salt-resistant and shear-resistant cationic association copolymer
摘要
Abstract
Objective The polymer chain segment used in oilfield chemical working fluids such as fracturing fluid is easy to shear fracture,and the salt-resistant effect needs to be improved.Therefore,the design of a polymer with shear-resistant and salt-resistant is of great significance for the efficient utilization of fracturing fluid.Method Two associative acrylamide copolymers were synthesized by aqueous polymerization using acrylamide(AM),sodium acrylate(NaAA)and two cationic monomers as raw materials.The structural characterization,microstructure,salt resistance,shear resistance and drag reduction were tested.Result Infrared spectroscopy and nuclear magnetic resonance hydrogen spectroscopy confirmed that the prepared copolymers were the target products,and microscopic scanning electron microscopy showed that they had a remarkable spatial network structure.When the mass concentration of the two modified polymers was higher than 3 000 mg/L,the polymers behaved as the high elastic and low viscosity fluids.When the shear rate of 170 s-1 was cut for 60 min,the viscosity retention rate of two polymers was higher than 88%,and the apparent viscosity of two polymers was higher than 25.0 mPa·s at 1 000 s-1,with significant shear-resistant effects.When the mass concentration of P(AM/NaAA/AQAS3)polymer solution was 500 mg/L and the pipeline flow rate was 45 L/min,the drag reduction rate of NaCl with a salinity of 10 000 mg/L was as high as 72.54%,and the drag reduction rate of CaCl2 with a salinity of 2 500 mg/L was 63.52%.Under the same conditions,the drag reduction rate of P(AM/NaAA/AQAS4)polymer solution in 10 000 mg/L NaCl solution was 72.37%,and that in 2 500 mg/L CaCl2 solution was 64.72%,which had a good drag reduction effect.Conclusion By designing associative polymers with different hydrophobic structures,and comparing their salt resistance,shear resistance and other characteristics,a theoretical basis is provided for the development of new salt-resistant and shear-resistant associative polymers with hydrophobic structures,and ideas are also provided for the construction of high-performance shear-resistant and low friction fracturing fluid systems during the shale gas extraction.关键词
丙烯酰胺共聚物/耐盐抗剪切/疏水缔合聚合物/减阻剂/压裂液Key words
acrylamide copolymer/salt resistance and shear resistance/hydrophobically associating polymer/drag-reducing agent/fracturing fluid引用本文复制引用
赵方剑,何冬月,代雅兴,张鹏..耐盐抗剪切阳离子缔合型共聚物的制备及性能研究[J].石油与天然气化工,2025,54(5):89-97,9.基金项目
中国石化重大科研项目"非均相复合驱技术应用与示范"(P23246) （P23246）
