摘要
在油田修井作业中,需要控制暂堵剂的破胶速度,修井过程中不破胶确保作业完成,修井结束后快速破胶恢复生产。传统破胶剂很难达到“前慢后快”的释放效果,为此设计了纤维素基双层衣膜结构的缓释型胶囊破胶剂。将破胶剂与熔融的巴西棕榈蜡混合均匀,利用挤出-滚圆法制成固体分散体式载药丸芯,再将丸芯在Wurster流化床中包覆组份不同的双层衣膜,制得缓释胶囊破胶剂。正交试验结果表明:此制备方法可靠,丸芯收率为93.2%;电子扫描电镜结果表明,微丸表面衣膜光滑均匀,衣膜孔隙的封堵和疏通是药物缓释的关键;缓释效果测试实验和模拟储层破胶实验结果表明,缓释胶囊具有良好的缓释效果和储层渗透率恢复效果。药物的缓释主要由双层膜结构控制,此制备方法简便高效,能达到实验预期效果。
During oilfield workover,it is necessary to control the gel breaking speed of the temporary plugging agent,so that the gel is not broken during the workover to ensure the completion of the operation and is broken quickly after the workover to resume production.For traditional gel breakers,it is difficult to achieve a slow release at the initial stage and a fast release at the late of the workover.This paper describes a cellulose-based sustained-release encapsulated gel breaker with a double-layer film.This gel breaker is evenly mixed with molted Carnauba wax and the solid dispersion pellet is made using the extrusion-speronization method.In the Wurster fluidized bed,a double-layer film with different components is put on the pellet to prepare the sustained-release encapsulated gel breaker.The result of the orthogonal test shows that this method is reliable,the yield of the pellet is 93.2%.SEM result shows that the film on the surface of the pellet is smooth and uniform,and the sealing and unblocking of the film pores are crucial to sustained-release.The results of sustained-release test and simulation test of reservoir gel breaking exhibit that the sustained-release encapsulated gel breaker has an excellent controlled-release effect and reservoir permeability recovery effect.Herein,the preparation method is simple and efficient.The sustained-release of drugs is mainly controlled by the double-layer film.
作者
黄晓磊
丁伟
HUANG Xiaolei;DING Wei(College of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing 163318,China)
出处
《山东科学》
CAS
2023年第4期97-103,共7页
Shandong Science
基金
黑龙江省应用技术研究与开发计划(GA20A201)。
