基于双丙酮丙烯酰胺热增黏聚合物的研究

ThermoviscosifyingBehaviorsofCopolymersBasedon N-（1，1-Dimethyl -3-Oxobutyl）-Acrylamide

冯玉军 鲁智勇 王毓

Feng Yujun ，Lu Zhiyong ，Wang Yu

聚丙烯酰胺及其衍生物是油气开采行业应用最广泛的水溶性聚合物，但由于其耐温抗盐性差而限制了其在高温、高盐油藏中的应用。热刺激增黏是解决油气开采用聚合物耐温抗盐性差的有效途径。利用基于双丙酮丙烯酰胺的温敏大分子单体与丙烯酰胺共聚，得到了系列热增黏聚合物。考察了矿化度、聚合物浓度、聚合物相对分子质量、温敏单体的性质对聚合物溶液热增黏能力的影响。结果表明：在矿化度为82868 mg/L时，0.15% 的聚合物溶液即能表现出明显的热增黏效应；矿化度越高或聚合物相对分子质量越高，热增黏能力越强，热缔合温度越低；相对于偶联反应一步法制得的温敏大单体，利用丙烯酰氯通过两步法合成的温敏大单体与丙烯酰胺共 聚得到的聚合物具有更强的热增黏能力。图8 表2 参20

Polyacrylamide and its derivatives have been widely used in oil and gas production；however，their poor salt-tolerance and weak thermostability have impeded their applications in high-temperature and high-salinity oil reservoirs. Thermo-induced viscosifying may be one of the effective solutions for tackling such deficiencies. In this work，a series of nonionic thermoviscosifying copolymers were prepared by copolymerzation of acrylamide and thermo-sensitive macromonomer based on N-（1，1-dimethyl-3-oxobutyl ）-acrylamide ，and the effect of salinity，polymer oncentration，polymer molecular weight ，as well as the nature of the macromonomer on the thermoviscosifying ability of the copolymers was examined. It was found that 0.15% polymer solution could show clear theomoviscosifying ability at82868 mg/L salinity，and the higher the salinity ，or the higher the polymer concentration，the higher the polymer molecular weight ，the stronger the thermothickening ability ；the copolymers based on the macromonomer prepared from a two-step process with acryloyl chloride showed superior thermoviscosifying ability over those from the macromonoer prep ared via one-step coupling reaction.