The Synthesis and Evaluation of a New Zwitterionic Copolymer(AM/DEPS)
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摘要: 海上油田在应用聚合物驱油技术时，现有聚合物在海水中黏度低、不易溶解，不能满足海洋平台在线配制驱替液的要求。为此，以丙烯酰胺（AM）和甲基丙烯酰氧乙基-N，N-二乙基丙磺酸盐（DEPS）为共聚单体，采用反相乳液聚合法合成了新型两性离子共聚物（AM/DEPS）。通过红外光谱和氢核磁共振谱分析了共聚物（AM/DEPS）的结构，结果表明，该共聚物分子链中含有丙烯酰胺、DEPS链节，两性离子单体DEPS被引入到了共聚物分子链中。考察了单体DEPS摩尔分数、乳化剂、引发剂、反应温度等对共聚物特性黏数的影响，确定最佳共聚反应条件为：反应温度25~30℃，引发剂用量0.08%，乳化剂与油相质量比1：8，单体DEPS摩尔分数2.5%。共聚物（AM/DEPS）的抗盐增黏性及溶解性评价结果表明，该共聚合物乳液在海水中可快速溶解，且具有优异的抗盐增黏效应，能满足海洋平台上用海水直接在线配制驱替液的要求。Abstract: In polymer flooding in offshore oil fields, the existing polymer cannot meet the requirements of online flooding fluid formulation on offshore platforms due to its low viscosity and poor solubility in seawater. A new type of zwitterionic copolymer (AM/DEPS) was synthesized through inverse emulsion polymerization with acrylamide (AM) and methyl acryl oyloxyethyl-N,N-diethyl-CHAPSO(DEPS) as the comonomer. The structure of the copolymer was analyzed by IR and HNMR spectrum. Analysis results showed that the copolymer molecular chain contains acrylamide, DEPS links and the DEPS zwitterionic monomer is introduced into the molecular chain of the copolymer. The effects of monomer DEPS mole fraction, emulsifiers, initiator and the reaction temperature on the intrinsic viscosity of the copolymer were analyzed. The optimum copolymerization reaction condition were determined: reaction temperature around 25-30℃, initiator percentage 0.08%, emulsifier to oil phase mass ratio 1∶8 and DEPS monomer mole fraction 2.5%. The salt thickening and solubility of the copolymer were evaluated and it showed that the copolymer emulsion could be quickly dissolved in seawater with excellent viscosifying effect, which could meet the requirement of flooding fluid online formulation with seawater for offshore platforms.
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