EVA/PMMA杂化改性降凝剂对长庆含蜡原油流变性的影响机理  

Influence Mechanism of EVA/PMMA Hybrid Pour Point Depressant on Rheology of Changqing Waxy Crude Oil

作　　者：刘峻峰 石磊 杨飞[2] 闫锋 李其抚 聂超飞 LIU Junfeng;SHI Lei;YANG Fei;YAN Feng;LI Qifu;NIE Chaofei(PipeChina Research Institute of Science and Technology,Langfang 065000,China;College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266580,China)

机构地区：[1]国家管网集团科学技术研究总院分公司,河北廊坊065000 [2]中国石油大学(华东)储运与建筑工程学院,山东青岛266580

出　　处：《石油学报（石油加工）》2024年第6期1720-1725,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(51904327,51774311)资助。

摘　　要：基于聚甲基丙烯酸甲酯(PMMA)微球良好的有机相容性,通过熔融共混法将PMMA微球与乙烯-醋酸乙烯酯共聚物(EVA28)降凝剂复合制备了EVA/PMMA杂化改性降凝剂;以长庆含蜡原油为研究对象,通过流变实验评价了EVA/PMMA杂化改性降凝剂对原油流变性的改善效果,利用差示扫描量热法和偏光显微镜法考察了添加降凝剂前后原油的结晶特性和蜡晶形貌变化。结果表明:与纯EVA28降凝剂相比,加入质量分数20 mg/kg EVA/PMMA杂化改性降凝剂使长庆含蜡原油的凝点从8℃降低到5℃,5℃时的黏度从40.96 mPa·s减小到35.56 mPa·s,屈服值从0.527 Pa减小到0.224 Pa。EVA/PMMA杂化改性降凝剂可以进一步降低长庆含蜡原油的析蜡点,增溶石蜡的正向作用更加显著,利于改善原油的流变性。Based on the organic compatibility of polymethyl methacrylate(PMMA),an ethylene-vinyl acetate copolymer and polymethyl methacrylate(EVA/PMMA)hybrid pour point depressant was prepared by melt blending method.This is a case study of Changqing waxy crude oil.The improvement of EVA/PMMA hybrid pour point depressant on the rheological properties of crude oil was evaluated by rheological experiments,and changes in the crystallization characteristics of crude oil and morphology of wax crystals before and after adding pour point depressant were investigated by differential scanning calorimetry and polarizing microscope.The results show that the pour point of Changqing crude oil is further decreased from 8℃to 5℃,and the viscosity and yield value at 5℃are further decreased from 40.96 mPa·s to 35.56 mPa·s and 0.527 Pa to 0.224 Pa respectively by EVA/PMMA hybrid pour point depressant,as compared with the pure EVA28 at the dosage of 20 mg/kg.The hybrid depressant can further reduce the wax precipitation point of Changqing crude oil and solubilizes paraffin waxes more significantly,which positively contributes to the improvement of crude oil rheology.

关 键 词：含蜡原油 降凝剂 聚甲基丙烯酸甲酯 乙烯-醋酸乙烯酯共聚物 流变性 黏度 蜡晶 

分 类 号：TE832[石油与天然气工程—油气储运工程]