Chemical Industry and Engineering Progress ›› 2018, Vol. 37 ›› Issue (08): 3076-3085.DOI: 10.16085/j.issn.1000-6613.2017-1812

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Preparation of the sustained-release microencapsulation of ammonium persulfate by induced coalescence

HUANG Fuzhi, ZHOU Qian   

  1. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing 102249, China
  • Received:2017-08-30 Revised:2018-01-31 Online:2018-08-05 Published:2018-08-05

诱导聚结法过硫酸铵缓释微胶囊的制备

黄福芝, 周倩   

  1. 中国石油大学(北京)理学院, 重质油国家重点实验室, 北京 102249
  • 通讯作者: 周倩,副教授,研究方向纳米新材料的制备和研究。
  • 作者简介:黄福芝(1992-),女,硕士研究生。E-mail:736854013@qq.com。
  • 基金资助:
    中国石油科技创新基金项目(2014D-5006-0214)。

Abstract: During the fracture process of oil production,the rapid break of hydrogel fracturing fluid would negatively affect the fracturing construction. To solve this problem,a microcapsule breaker with the sustained-release performance is the key point. Ammonium persulfate (APS) was microencapsulated with the shell of acrylonitrile-butadiene-styrene copolymer (ABS) via coacervation induced by polydimethylsiloxane (PDMS). Here,we investigated the composition structure,micro-morphology,particle size distribution,and release performance of product,and the influence factors. It is concluded that the APS microcapsules coated with ABS (APS/ABS microcapsules) were microspheres at micron scale which possess a core-shell structure,good slow release property and benign breaking performance for the hydraulic gel fracturing system. There were some factors such as the ratio of nuclear to shell,the viscosity of PDMS and stirring rate affecting the particle size distribution,release property of the microcapsules and the embedding rate of ammonium persulfate in the microcapsules. Once the viscosity of PDMS surpassed 3000mm2/s,the embedding rate of ammonium persulfate in microcapsule breaker could be > 70%. In addition,all the reagents could be recycled to lower production cost during the preparation process. Therefore,it is an economical and feasible method to achieve the microencapsulation of APS through ABS coacervation induced by PDMS.

Key words: microcapsule, coalescence, particle size distribution, petroleum, fracturing fluid, acrylonitrile-butadiene-styrene (ABS), ammonium persulfate

摘要: 在石油开采的压裂过程中,水凝胶压裂液的提前快速破胶会影响压裂施工,具有缓释性能的微胶囊破胶剂成为解决这一问题的关键。本文通过聚二甲基硅氧烷(PDMS)诱导丙烯腈-丁二烯-苯乙烯共聚物(ABS)壳材料的凝聚,实现了对过硫酸铵(APS)破胶剂的微胶囊化。研究了产品的组成结构、微观形态、粒径分布,并探讨了其缓释性能、破胶性能及其影响因素。结果表明,ABS包覆的APS微胶囊(APS/ABS微胶囊)是具有核-壳结构的微米级微球,对水凝胶压裂体系具有良好的缓释破胶性能。其粒径分布、释放性质、微胶囊中过硫酸铵的包埋率都受核/壳比、PDMS黏度和转速的影响。当PDMS运动黏度大于3000mm2/s时,微胶囊破胶剂中过硫酸铵的包埋率可达70%以上。值得一提的是,制备过程中的所有有机试剂均可实现回收再利用以降低生产费用。因此,通过PDMS诱导ABS凝聚实现对APS的微胶囊化是一种经济可行的方法。

关键词: 微胶囊, 凝聚, 粒度分布, 石油, 压裂液, 丙烯腈-丁二烯-苯乙烯, 过硫酸铵

CLC Number: 

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