高含蜡原油聚烯烃降凝防蜡剂的合成及性能评价  

Synthesis and performance evaluation of polyolefin pour point depressant and paraffin inhibitor for high waxy crude oil

作　　者：王翔 张国欣 陆原 胡廷 魏强 陈严飞[2] 陈小敏 曾喆 WANG Xiang;ZHANG Guoxin;LU Yuan;HU Ting;WEI Qiang;CHEN Yanfei;CHEN Xiaomin;ZENG Zhe(CNOOC(Tianjin)Oilfield Chemical Co.,Ltd.,Tianjin 300480,China;China University of Petroleum,Beijing 102249,China)

机构地区：[1]中海油(天津)油田化工有限公司,天津300480 [2]中国石油大学(北京),北京102249

出　　处：《精细化工》2024年第4期902-910,928,共10页Fine Chemicals

基　　金：国家自然科学基金项目(52171285);天津市科技领军企业重大创新项目(22YDLQGX00020);中海油能源发展科技重大专项(HFZDZX-GJ2021-02)。

摘　　要：以丙烯酸十八酯(ODA)、十八烯(ODE)和苯乙烯(SM)为单体合成三元共聚物P(ODA-co-ODE-co-SM),以其为主剂合成了聚烯烃降凝防蜡剂POOS,对三元共聚物的合成条件进行了优化,并对加剂前后原油流变性、析蜡特性、微观形态以及降凝防蜡效果进行了评价。结果表明,三元共聚物最优的合成工艺条件为n(ODA)∶n(ODE)∶n(SM)=5∶3∶2、引发剂过氧化苯甲酰含量(以丙烯酸十八酯、十八烯和苯乙烯总质量为基准,下同)为5‰、反应温度70℃、反应时间8h。当POOS质量浓度为200mg/L时,原油流变性与未加POOS原油相比变化明显,15℃下加剂前后屈服应力为50.30和2.95 Pa,屈服应力降幅为94%,析蜡温度由31.33℃降至24.94℃,凝点由25℃降至15℃,加剂后冷指测试防蜡率为88.00%,环道测试防蜡率为83.70%,蜡晶形态由针状转变为圆状结晶,加剂后蜡晶析出分布不均匀,多个微小蜡晶聚集析出形成单个聚集体,POOS的加入有效改善了蜡晶分散形态,抑制网状结构形成,显著改善了原油低温流动效果。The polyolefin pour point depressant and anti wax agent POOS was synthesized from ternary copolymer P(ODA-co-ODE-co-SM),which was obtained from reaction of octadecyl acrylate(ODA),octadecene(ODE),and styrene(SM).The synthesis conditions of the ternary copolymer P(ODA-co-ODE-co-SM)were optimized,followed by evaluation on influence of POOS on the rheological properties,wax precipitation characteristics,microstructure,and anti wax effect of crude oil.The results showed that the optimal synthesis conditions of P(ODA-co-ODE-co-SM)were as follows:n(ODA)∶n(ODE)∶n(SM)=5∶3∶2,initiator benzoyl peroxide content(based on the total mass of octadecyl acrylate,octadecene and styrene)of 5‰,reaction temperature of 70℃,and reaction time of 8 h.The crude oil added with 200 mg/L POOS exhibited significant changes in rheological properties compared with that without POOS,displaying a drop of yield stress from 50.30 Pa to 2.95 Pa at 15℃,wax precipitation temperature from 31.33℃to 24.94℃,and pour point from 25℃to 15℃.Moreover,the crude oil added with POOS showed a wax prevention rate in the cold index test of 88.00%,and a wax prevention rate in the ring test of 83.70%,with the wax crystal morphology changing from needle like to circular crystal,more uneven wax crystal precipitation distribution,and multiple small wax crystals aggregated and precipitated to form a single aggregate.The addition of POOS effectively improved the dispersion morphology of wax crystals,inhibited the formation of network structures,and significantly improved the low-temperature flow effect of crude oil.

关 键 词：聚烯烃 降凝防蜡 流变性 析蜡特性 微观结构 油田化学品 

分 类 号：TE39[石油与天然气工程—油气田开发工程] TQ317[化学工程—高聚物工业]