【摘要】 针对现有聚合物增黏剂存在高温降黏缺陷，不能有效调控无固相水基钻井液高温流变性能的难题，采用自由基胶束聚合法制备了丙烯酰胺(AM)/新型温敏单体(MVC)/2-丙烯酰胺基-2-甲基丙磺酸钠(NaAMPS)梳型温敏聚合物(TSP-Comb)。采用红外光谱、核磁氢谱和凝胶渗透色谱等表征和测定了TSP-Comb的分子结构和重均分子量，采用热重分析和环境扫描电镜分别测定了TSP-Comb分子链的热稳定性和微观结构，采用流变仪和可见分光光度计研究了TSP-Comb的温度响应特性，并研究了TSP-Comb对无固相水基钻井液高温流变性能的调控效果。研究结果表明，TSP-Comb溶液在90～180℃范围内具有优良的高温增稠特性和较高的相变温度(高于60℃),相比较于线性温敏聚合物，TSP-Comb在高温流变稳定性和相变温度提升方面均有明显改善；TSP-Comb的高温增稠特性有助于改善无固相钻井液的高温流变性能，基于TSP-Comb构建的无固相钻井液的表观黏度、塑性黏度、动切力等流变参数在90～180℃较宽温度范围内的变化率小于25%,TSP-Comb显著提高了无固相钻井液的高温流变稳定性，为无固相水基钻井液高温流变性能调控提供了一种新方法。更多还原

【Abstract】 In view of the problem that existing polymer tackifiers have the defect of viscosity reduction at high temperature and cannot effectively regulate the high-temperature rheological properties of solid-free water-based drilling fluid, acrylamide(AM)/new thermo-sensitive monomer(MVC)/sodium 2-acrylamido-2-methylpropane sulfonate(NaAMPS)comb-type thermo-sensitive polymer(TSP-Comb)was prepared by free radical micellar polymerization. The molecular structure and weight-average molecular weight of TSP-Comb were characterized and measured by infrared spectroscopy, nuclear magnetic hydrogen spectroscopy and gel permeation chromatography. The thermal stability and microstructure of TSP-Comb molecular chain were measured by thermo gravimetric analysis(TGA)and environmental SEM, respectively. The temperature response characteristics of TSP-Comb was studied using rheometer and visible spectrophotometer, and the regulation effect of TSP-Comb on the high-temperature rheological properties of solid-free water-based drilling fluid was also studied. The results show that TSP-Comb solution has excellent high-temperature thickening property within the temperature range of 90 ℃ to 180 ℃ and higher phase transition temperature(higher than 60 ℃). Compared with linear thermo-sensitive polymers, TSP-Comb has been significantly improved in terms of high-temperature rheological stability and phase transition temperature. The high-temperature thickening property of TSP-Comb helps improve the high-temperature rheological properties of solid-free drilling fluid. The change rate of rheological parameters such as apparent viscosity, plastic viscosity and dynamic shear force of solid-free drilling fluid based on TSP-Comb was lower than 25% within a wide temperature range of 90 ℃ to 180 ℃, and TSP-Comb has significantly improved the high-temperature rheological stability of solid-free drilling fluid, providing a new method for regulating the high-temperature rheological properties of solid-free water-based drilling fluid.更多还原