改性羧基纳米纤维带界面及驱油性能  

Study on interface and oil displacement performance of modified nanofiber strips

作　　者：袁杰[1,2] 刘德新[1] 贾寒[1] YUAN Jie;LIU Dexin;JIA Han(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao City,Shandong Province,266580,China;Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257001,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石化胜利油田分公司,山东东营257001

出　　处：《油气地质与采收率》2023年第3期136-144,共9页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目“高效耐盐两亲聚合物超分子包合驱油体系增效方法及作用机理”(52130401)和“特低渗油藏壁面流体层调控机理与方法”(51974344)。

摘　　要：针对油田常用聚合物驱油剂用量高、耐盐性能差、与表面活性剂复配使用易发生色谱分离现象等问题,选取天然高分子化合物竣基纳米纤维带为原料,制备了疏水改性竣基纳米纤维带(CCNF-n)和两性-疏水改性按基纳米纤维带(ACCNF-zi)单组分稠油驱油剂,评价了疏水改性程度和两性-疏水改性对竣基纳米纤维带界面活性、乳化能力及驱油性能的影响。结果表明:疏水改性程度的增加使得竣基纳米纤维带界面活性先提升后降低,而阳离子基团的引入增强了竣基纳米纤维带与水的相互作用,使得具有相同疏水改性程度的两性-疏水改性竣基纳米纤维带界面活性相应减小。在温度为70℃,矿化度为50000mg/L,质量分数为0.2%的条件下,疏水改性程度越大,纳米纤维带黏度越高,5种疏水改性竣基纳米纤维带黏度为1.54-3.85mPa·s,而两性-疏水改性竣基纳米纤维带在相同条件下黏度为18.46-27.31mPa·s,耐盐性能较强。岩心驱替结果表明,两性-疏水改性竣基纳米纤维带体系能够显著提高采收率(为18.91%)。Polymer flooding agents commonly used in oilfields have high consumption and poor salt resistance and tend to undergo chromatographic separation when compounded with surfactants.In view of these problems,the carboxyl nanofiber strips of the natural polymeric compound were selected as raw materials,and single-component flooding agents of hydrophobically modified nanofiber strips(CCNF-n)and amphoteric-hydrophobically modified nanofiber strips(ACCNF-n)were prepared for heavy oil.The effects of the hydrophobic modification degree and amphoteric-hydropho-bic modification on the interfacial activity,emulsification ability,and oil displacement performance of carboxyl nanofiber strips were evaluated.The results showed that the increament of hydrophobic modification degree first increased and then decreased the interfacial activity of carboxyl nanofiber strips,and the interaction between the carboxyl nanofiber strips and the water was enhanced due to the introduction of cationic groups,which made the interfacial activity of am-photeric-hydrophobically modifed nanofiber strips with the same hydrophobic modification degree decrease correspondingly.Under the conditions of 70℃,salinity of 50000 mg/L,and mass fraction of 0.2%,the nanofiber strips with a greater bydrophobic modification degree indicates a higher viscosity.The viscosities of five hydrophobically modified nanofber strips ranged from 1.54 to 3.85 mPa.s.Under the same conditions,the viscosities of the amphoteric-hydropho-bically modified nanofiber strips fluctuated between 18.46 mPa's and 27.31 mPa's,exhibiting excellent salt resistance.The results of core displacement experiments showed that the amphoteric-bydrophobically modified nanofiber strip system could significantly enhance the oil recovery(18.91%).

关 键 词：改性羧基纳米纤维带 疏水改性程度 界面活性 乳化能力 耐盐性能 

分 类 号：TE357.9[石油与天然气工程—油气田开发工程]