Intelligent responsive self-assembled micro-nanocapsules:Used to delay gel gelation time  

作　　者：Chuan-Hong Kang Ji-Xiang Guo Dong-Tao Fei Wyclif Kiyingi 

机构地区：[1]Unconventional Petroleum Research Institute,China University of Petroleum,Beijing,102249,China

出　　处：《Petroleum Science》2024年第4期2433-2443,共11页石油科学（英文版）

基　　金：support and funding from the National Natural Science Foundation of China (No.52174047);Sinopec Project (No.P21063-3)。

摘　　要：In the application of polymer gels to profile control and water shutoff,the gelation time will directly determine whether the gel can"go further"in the formation,but the most of the methods for delaying gel gelation time are complicated or have low responsiveness.There is an urgent need for an effective method for delaying gel gelation time with intelligent response.Inspired by the slow-release effect of drug capsules,this paper uses the self-assembly effect of gas-phase hydrophobic SiO_(2) in aqueous solution as a capsule to prepare an intelligent responsive self-assembled micro-nanocapsules.The capsule slowly releases the cross-linking agent under the stimulation of external conditions such as temperature and pH value,thus delaying gel gelation time.When the pH value is 2 and the concentration of gas-phase hydrophobic SiO_(2) particles is 10%,the gelation time of the capsule gel system at 30,60,90,and 120℃is12.5,13.2,15.2,and 21.1 times longer than that of the gel system without containing capsule,respectively.Compared with other methods,the yield stress of the gel without containing capsules was 78 Pa,and the yield stress after the addition of capsules was 322 Pa.The intelligent responsive self-assembled micronanocapsules prepared by gas-phase hydrophobic silica nanoparticles can not only delay the gel gelation time,but also increase the gel strength.The slow release of cross-linking agent from capsule provides an effective method for prolongating the gelation time of polymer gels.

关 键 词：Profile control and water shutoff Polymer gel Delayed gelation time Intelligent response SELF-ASSEMBLED Micro-nanocapsules 

分 类 号：TE358.3[石油与天然气工程—油气田开发工程]