具有增强力学性能的助破胶微胶囊的制备与性能评价*

Preparation and Performance Evaluation of Auxiliary Gel Breaking Microcapsule with Enhanced Mechanical Property

朱永杰 赵亚睿 窦姝凡 程 立 廖锐全 李 振

ZHU Yongjie ZHAO Yarui DOU Shufan CHENG Li LIAO Ruiquan LI Zhen

冻胶阀技术已广泛地应用于欠平衡钻完井作业中，机械钻入和化学破胶相结合为主要的破胶方式，但破胶 过程依然存在着周期长和作业成本高等问题，无法满足现场生产需求。通过双乳液法以聚乙烯醇（PVA）为稳定 剂溶液、醚类衍生物（EA-1）为壳层对盐酸（HCl）进行包覆，制得助破胶微胶囊。通过扫描电子显微镜分析了微 胶囊的微观结构和粒径分布，研究了微胶囊的助破胶性能和缓释性能及其影响因素。结果表明，当使用6.5%的 EA-1溶液和2%的PVA稳定剂溶液制备时微胶囊颗粒形态较好，粒径为40～60 μm，载药率约为44.4%。在60 ℃ 下，该助破胶微胶囊在胶体中充当填料，使冻胶强度提升约64.3%，且使破胶剂破胶效率提升36.7%，破胶时间较 未加微胶囊的体系减少三分之一，可大大缩短现场施工周期，提高经济效益。图6表1参23

Gel valve technology has been widely used in underbalanced drilling and completion operations. At present，the combination of mechanical drilling and chemical breaking is the main way of breaking gel，but the process of breaking gel still has the problems of long cycle and high operating cost，which cannot meet the requirements of on-site production. The auxiliary gel breaking microcapsule was prepared by double emulsion method using polyvinyl alcohol（PVA）as the stabilizer solution and ether analogue（EA-1）as the shell layer to cover hydrochloric acid（HCl）. The microstructure and particle size distribution of the product were analyzed by scanning electron microscope. The properties of gel breaking aid and slow release of microcapsules and their influencing factors were studied. The results showed that when the microcapsule was prepared with 6.5% EA-1 solution and 2% PVA stabilizer solution，the morphology of microcapsule was desired，the particle size ranged from 40 to 60 μm，and the drug loading rate was approximately 44.4% . At 60 ℃ ，the auxiliary gel breaking microcapsule acted as a filler in the gel，which increased the gel strength by 64.3% and the gel breaking efficiency of gel breaker by 36.7%. Compared with the system without microcapsule，the gel breaking time was reduced by 1/3，which greatly shortened the field construction period and improved economic benefit.

10.19346/j.cnki.1000-4092.2021.03.007