用于超稠油乳化降黏的两亲型聚合物  

Amphiphilic Polymers for Emulsification and Viscosity Reduction of Super Heavy Oil

作　　者：张蕊[1] 张刚 王桂芹[1] 张添锦[1] 张伟[3] ZHANG Rui;ZHANG Gang;WANG Guiqin;ZHANG Tianjin;ZHANGWei(School of Petroleum Engineering and Environmental Engineering,Yan’an University,Yan’an,Shaanxi 716000,P R of China;Dingbian Oil Production Plant of Yanchang Petroleum Company,Ltd,Yulin,Shaanxi 718600,P R of China;Petroleum Engineering General Contracting Branch of CNPC Bohai Drilling Engineering Company,Xi’an,Shaanxi 710016,P R of China)

机构地区：[1]延安大学石油工程与环境工程学院,陕西延安716000 [2]延长石油股份有限公司定边采油厂,陕西榆林718600 [3]中国石油集团渤海钻探工程公司石油工程总承包分公司,陕西西安710016

出　　处：《油田化学》2023年第3期496-502,共7页Oilfield Chemistry

基　　金：陕西省教育厅专项科研计划项目“鄂尔多斯盆地吴起地区长8裂缝性碳酸盐岩储层保护技术研究”(项目编号20JK0879);延安大学教学改革研究项目“工程教育专业认证背景下的石油工程专业生产实习教学改革研究”(项目编号YDJG22-40)。

摘　　要：为了提高超稠油油藏乳化降黏开发的效率,首先以丙烯酰胺(AM)、N,N-二甲基甲酰胺(DMF)、溴代烷烃和溴化苄等为原料制得功能单体N-苄基-N-烷基丙烯酰胺(DTAM),然后再以AM、2-丙烯酰胺基-2-甲基丙磺酸钠(AMPS)和DTAM为原料制得两亲型聚合物(PBS-2)。采用红外光谱仪、核磁共振波谱仪和元素分析仪对聚合物的结构进行了表征;以合成产物的降黏率为评价指标,对PBS-2的合成条件进行了优化;评价了PBS-2的界面活性、润湿性能和对不同黏度稠油的乳化降黏性能。结果表明,PBS-2的最佳合成条件为:AM、AMPS、DTAM物质的量比为90∶4∶6,单体总质量分数为25%,引发剂偶氮二异丙基咪唑啉盐酸盐的质量分数为0.4%,反应温度为50℃,反应时间为6 h。PBS-2的界面活性较强,当其质量浓度达到3 g/L时,即可将油水界面张力值降至10^(-2)mN/m数量级。PBS-2的润湿性能较好。PBS-2溶液的质量浓度由0增至5 g/L时,其与稠油之间的接触角由113.2°降至32.9°,稠油表面的润湿性由亲油转变为亲水。PBS-2对超稠油的乳化降黏效果较好,当质量浓度为3g/L时,对黏度为10.5~112.5 Pa·s的超稠油样品的降黏率可以达到99%以上。合成的两亲型聚合物PBS-2能有效乳化剥离稠油,改善稠油的流动性,满足超稠油乳化降黏的需求,为超稠油油藏化学降黏开发提供借鉴。In order to improve the efficiency of emulsification and viscosity reduction development of super heavy oil reservoirs,the functional monomer N-benzyl-N-alkylacrylamide(DTAM)was first prepared using acrylamide(AM),N,N-di N-methylformamide(DMF),bromoalkane and benzyl bromide as raw materials.Then the amphiphilic polymer(PBS-2)was prepared from AM,2-acrylamido-2-methylpropane sulfonate(AMPS)and DTAM.The structure of the polymer was characterized using infrared spectroscopy,nuclear magnetic resonance spectroscopy,and elemental analysis.The synthesis condition of PBS-2 was optimized using the viscosity reduction rate of synthesized product as an evaluation indicator.The interfacial activity,wetting performance,and emulsification and viscosity reduction performance of PBS-2 for heavy oil with different viscosities were evaluated.The results showed that the optimum synthesis condition for PBS-2 was obtained as follows:90∶4∶6 the molar ratio of AM,AMPS and DTAM,25%the total mass fraction of monomers,0.4%the mass fraction of initiator azodiisopropyl imidazoline hydrochloride,50℃ reaction temperature,and 6 hours reaction time.The interfacial activity of PBS-2 was strong.When its mass concentration reached 3 g/L,the oil-water interfacial tension value could be reduced to the order of 10^(-2) mN/m.PBS-2 had good wetting performance.When the mass concentration of PBS-2 solution increased from 0 to 5 g/L,the contact angle between it and heavy oil decreased from 113.2°to 32.9°.The wettability of the heavy oil surface changed from lipophilic to hydrophilic.PBS-2 had a good emulsification and viscosity reduction effect on super heavy oil.When the mass concentration of PBS-2 was 3 g/L,the viscosity reduction rate of super heavy oil samples with viscosity ranging from 10.5 Pa·s to 112.5 Pa·s could reach over 99%.The synthesized amphiphilic polymer PBS-2 could effectively emulsify and peel off heavy oil,improve the flowability of heavy oil,meet the needs of emulsification and viscosity reduction of super heavy oil,and the

关 键 词：超稠油 乳化降黏 两亲型聚合物 界面活性 润湿性 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]