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以丙烯酰胺、N,N’-亚甲基双丙烯酰胺、N-乙烯基吡咯烷酮、十六烷基二甲基烯丙基氯化铵为聚合单体,通过自由基引发进行不规则共聚合成一种清洁的CO2泡沫压裂液稠化剂.该稠化剂能够在饱和CO2酸性水溶液环境中溶解,溶液黏弹性好,并具有良好的抗温、耐剪切性能.由质量分数为0.4％的该稠化剂配制的压裂液在120℃、170 s-1条件下的黏度保持在60 mPa·s以上.同时研究发现,由该稠化剂配合起泡剂配制的清洁CO2泡沫压裂液具有良好的泡沫稳定性,半衰期可达到96 h,并且破胶彻底,残渣质量分数低.在中原油田的现场应用表明,利用该稠化剂配制的清洁CO2泡沫压裂液进行施工,增产效果明显.“,”A thickening agent is synthesized by free radical polymerization,using acrylamide,N,N'-methylene bisacrylamide,N-vinyl-2-pyrrolidone and hexadecyl dimethyl allyl ammonium chloride as raw materials.The obtained thickening agent can swell in acidic environment of the carbon dioxide saturated aqueous solution.Its solution has good viscoelasticity,high temperature-resistance and anti-shearing performance.Under the conditions of 120℃ and 170 s-1,the viscosity of the fracturing fluid prepared by adding 0.4％ of thickening agent still holds over 60 mPa·s.Meanwhile,the clean carbon dioxide foam fracturing fluid has outstanding foams stability.The half-life period of foam reaches up to 96 h.In addition,it possesses good gel breaking property and low residue content.A notable increment in productivity is observed in a production well of Zhongyuan oil field after it has been fractured by the clean carbon dioxide foam fracturing fluid.