温敏凝胶体系研究与性能评价  

Research and performance evaluation of thermosensitive gel system

作　　者：李亮[1,2] 王翔[1,3] 陈金梅 郭继香 LI Liang;WANG Xiang;CHEN Jin-mei;GUO Ji-xiang(Research Institute of Unconventional Oil and Gas Science and Technology,China University of Petroleum(Beijing),Beijing 102249,China;Research Institute of Engineering Technology,Northwest Oilfield Branch,SINOPEC,Urumqi 834000,China;CNOOC Energy Tech-Drilling&Production Co.,Tianjin 300459,China;Tianjin LNG Emergency Reserve Project Department of Beijing Gas Group Co.,Ltd.,Tianjin 300280,China)

机构地区：[1]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [2]中国石化西北油田分公司工程技术研究院,新疆乌鲁木齐834000 [3]中海油能源发展股份有限公司工程技术分公司,天津300459 [4]北京燃气集团有限责任公司天津液化天然气应急储备项目部,天津300280

出　　处：《应用化工》2022年第7期1869-1874,共6页Applied Chemical Industry

基　　金：国家自然科学基金(5217040876)。

摘　　要：为了克服油田开发中后期非期望水过高难题,实现水流优势通道的深部调控,采用物理交联成胶的方法,基于对凝胶化温度影响因素的分析,形成具有温度刺激响应特性的温敏凝胶体系,并对其性能进行评价。结果表明,体系热行为响应过程可分为聚合物舒展、凝胶形成和结构完善三个阶段;在90~120℃下高温老化50 d,体系黏度保留率最高可达94.97%,具有长期热稳定性;且在6×10^(4)mg/L地层水中可持续成胶,具有高浓度无机盐耐受性;变振荡频率扫描测试表明,振荡频率在0.01~1 Hz变化时,体系表现为弹性占主导的强弹性体流体特征;微观结构分析表明,聚合物与纳米二氧化硅之间存在相互作用,球状颗粒一方面附着在凝胶树状结构上,增强凝胶强度,另一方面增加凝胶网络的交联密度,形成孔径分别为2.37~3.76μm和6.57~7.94μm的致密内外层叠状网络结构。In order to overcome or minimize the excessive production of undesired water amounts during the secondary and tertiary stages of oilfield development and achieve deep-water control in the dominant channels.The basic adopts the method of physical crosslinking and gluing, and based on the analysis of the factors influencing the gelation temperature, the thermosensitive gel system with temperature stimulus response characteristics is formed, and its performance is evaluated.The results showed that the thermal behavior of the system can be divided into three stages: polymer stretching, gel formation and structural perfection.After being heated at 90~120 ℃ for 50 d, the viscosity retention rate of the system is as high as 94.97% and has long-term thermal stability;it can form gel continuously in 6×10^(4) mg/L formation water and has high concentration inorganic salt tolerance;the scanning test of variable oscillation frequency showed that when the oscillation frequency changes from 0.01 to 1 Hz, the system shows the characteristics of strong elastomer fluid dominated by elasticity;microstructural analysis with scanning electron microscope revealed that there was interaction between polymer and nano silica.On the one hand, globular particles attached to gel dendrimers, enhanced gel strength, and on the other hand increased crosslinking density of gel network, forming pore size of 2.37~3.76 μm and 6.57~7.94 μm.

关 键 词：物理凝胶 温敏性水凝胶 流变性 微观结构 

分 类 号：TQ317[化学工程—高聚物工业] TQ352[石油与天然气工程—油气田开发工程] TE357TE39