耐温抗盐驱油用纳米分散体系的研制与性能评价  

Development and Performance Evaluation of Nano-dispersion System for Oil Displacement with Temperature Resistance and Salt Tolerance

作　　者：王凯璐 杨欢[1] 高洁[2] 李俊成[2] 原堃 于小荣[1] 苏高申[1] WANG Kailu;YANG Huan;GAO Jie;LI Juncheng;YUAN Kun;YU Xiaorong;SU Gaoshen(College of Chemistry and Environmental Engineering,Yangtze University,Jingzhou,Hubei 434023,P R of China;The Third oil Production Plant of Changqing Oilfield,Yinchuan,Ningxia 750000,P R of China;China United Coal Bed Methane Company,Ltd,Taiyuan,Shanxi 030032,P R of China)

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023 [2]长庆油田第三采油厂,宁夏银川750000 [3]中联煤层气有限责任公司,山西太原030032

出　　处：《油田化学》2021年第4期677-682,共6页Oilfield Chemistry

基　　金：国家自然科学基金“温敏聚合物纳米复合材料对高温无固相钻井液流变性的调控机理”(项目编号51974034)。

摘　　要：为了改善聚合物驱油体系在高温高盐油藏中高温断裂、抗盐性和长期稳定性差的问题,研制了一种由油酸改性纳米SiO_(2)(O-SiO_(2))和疏水缔合聚合物KAPAM组成的纳米分散体系,评价了纳米分散体系的增黏性、耐温性、抗盐性、抗剪切性、长期稳定性和驱油效果。结果表明,与单一KAPAM溶液相比,纳米分散体系的三维网格结构提升了体系的结构稳定性及结构恢复能力,从而提高了体系的各项性能。O-SiO_(2)可使KAPAM溶液黏度增加,组成为0.15%KAPAM+0.3%O-SiO_(2)的纳米分散体系的黏度最大,增黏率为25.73%。纳米分散体系在90℃下的黏度保留率为89.41%;当体系中的NaCl、CaCl_(2)的质量浓度为60、7 g/L时,黏度保留率分别为72.13%、65.74%;纳米分散体系在90℃下可稳定分散约20 d;在90℃、矿化度为3.3×10^(4)mg/L的条件下,向填砂管中注入0.5 PV纳米分散体系可在水驱基础上提高采收率23.5%,表现出较好的耐温抗盐性、长期稳定性及驱油能力。In order to improve the problems of high temperature fracture,poor salt resistance and long-term stability of polymer flooding system in high temperature and high salt reservoirs,a new nano-dispersion system composed of oleic acid modified nano-SiO_(2)(O-SiO_(2))and hydrophobically associating polymer KAPAM was developed.The viscosity,temperature resistance,salt tolerance,shear resistance,long-term stability and oil displacement effect of the nano-dispersion system were evaluated.The results showed that compared with single KAPAM solution,the three-dimensional grid structure of nano-dispersion system increased structural stability and structural resilience of the system,which improved the properties of the system.O-SiO_(2) could increase the viscosity of KAPAM solution.The viscosity of nano-dispersion system composed of 0.15%KAPAM and 0.3%O-SiO_(2) was the highest,and the viscosity increasing rate was 25.73%.The viscosity retention of nano-dispersion system at 90℃was 89.41%.When the mass concentration of NaCl and CaCl_(2) in the system was 60 g/L and 7 g/L,the viscosity retention was 72.13%and 65.74%,respectively.The nano-dispersion system could be stably dispersed for about 20 days at 90℃.Under the condition of 90℃and salinity of 3.3×10^(4) mg/L,injecting 0.5 PV nano-dispersion system into sand filling pipe could improve oil recovery by 23.5%on the basis of water flooding,which showed good temperature resistance and salt tolerance,long-term stability and oil displacement ability.

关 键 词：纳米分散体系 疏水缔合聚合物 耐温抗盐 采收率 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]