苯乙烯-马来酸酐共聚物对大庆原油降凝作用的研究

Pour-point depressing process of styrene maleic anhydride copolymer in Daqing crude oil

降凝剂对原油的降凝减粘效果受其分子结构、使用剂量、活化温度及所受剪切强度的影响 ,并与原油的品质 (如 :蜡含量、胶质含量、碳数分布及组成等 )有着密切的关系 .为研制出适合大庆原油品质的降凝剂 ,合成了以苯乙烯 -马来酸酐共聚物 (SMA)的酯化物为主体的酯型降凝剂 (HJN -5#) ,并对其使用剂量、活化温度等参数进行了研究 ,还根据观察到的降凝剂使用前后原油中蜡晶形态的变化对降凝减粘作用机理进行了讨论 .结果表明 ,添加质量百分数为 0 .2 %的HJN -5#,可使大庆原油的倾点下降 50 % ,表观粘度下降 90 %以上 ,最佳活化温度为 88℃ .

The effect of pour point depressing and viscosity reducing to crude oil which led by pour point depressor would be severely influenced by the depressor's molecular configuration, additive quantity, active temperature, and shearing strength.And it also relates to the quality of crude oil including cere concentration, pectin concentration, carbon amount distribution and composition. For producing a kind of depressor suitable to Daqing crude oil, a pour point depressor (HJN 5#) mainly cousisting of an esterification product of styrene maleic anhydride copolymer(SMA) has been prepared, and the relationships between the pour point depressing effect and the impacting factors including depressor concentration, activation temperature ,and shear intensity have also been researched. In addition, by watching the variation of modality of cere crystalloid caused by adding depressor, the mechanism of pour point depressing and viscosity reducing were discussed. The results show that adding 0.2 wt% of HJN 5# could get 50% depression of pour point and more than 90% reduction of apparent viscosity of Daqing crude oil. The most suitable activation temperature of the depressor is 88 ℃.