Bibliographic Details
| Title: |
低温储层压裂液破胶用酸性 微胶囊的制备与性能评价. |
| Alternate Title: |
Preparation and performance evaluation of acidic microcapsules for gel breakage in fracturing fluids for low-temperature reservoirs. |
| Authors: |
李小刚1,2 swpuadam@126.com, 邱帮坤1,2, 梁彬3, 朱静怡1,2 zhujingyizoe@163.com, 杨兆中1, 易良平1, 王浩洋4, 程启迪4 |
| Source: |
Chemical Engineering of Oil & Gas / Shi You Yu Tian Ran Qi Hua Gong. Feb2026, Vol. 55 Issue 1, p68-75. 8p. |
| Subject Terms: |
*Fracturing fluids, *Microencapsulation, *Water temperature, *Gases, *Ethylcellulose, *Polyvinyl alcohol |
| Abstract (English): |
Objective Self-generated heat gas is an effective approach to solving the gel-breaking issue of fracturing fluids in low-temperature reservoirs. However, there is a problem that the acid catalyst in the self-generated heat system is incompatible with the alkaline fracturing fluid, and the addition of a sufficient amount of catalyst during fracturing at once may lead to excessively rapid gel breaking, making it difficult to achieve precise control. Method In this study, a double-emulsion solvent evaporation method was employed to encapsulate the acid catalyst of the self-generated heat gas system, using polyvinyl alcohol (PVA) as a stabilizer and ethyl cellulose (EC) as the shell material, thereby enabling controlled and delayed gel breaking of fracturing fluids under low-temperature conditions. Single-factor analysis and orthogonal experiments were conducted to optimize the gel-breaking microcapsule system. The microstructure and particle size distribution of the microcapsules were characterized using scanning electron microscopy (SEM) and laser particle size analysis, and their gel-breaking performance was evaluated. Result The optimal microcapsule formulation was achieved with 2.5 g EC, 4.50% emulsifier, 1.0% Tween-60, and 2% PVA stabilizer, resulting in microcapsules with an average particle size of 201.88 μm, a uniform particle size distribution, high sphericity, and an encapsulation efficiency of 46.76%. Conclusion When combined with the self-generated heat gas system, the porous shell structure of the microcapsules facilitates the slow release of hydrogen ions, enabling effective gel breaking of the fracturing fluid within 2 h at 40 ℃. The microcapsules exhibited remarkable delayed gel-breaking performance. This study is of great significance for ensuring effective gel breaking in low-temperature reservoir fracturing operations and expanding the application scope of microencapsulation technology. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
目的 针对自生热气技术用于低温储层压裂时, 酸性催化剂与碱性压裂液相容性差、破胶速度过快且难以控制的 问题, 旨在构建一种具备延迟释放功能的酸性微胶囊体系, 以实现压裂液在低温地层中的稳定、可控破胶。方法 采用双乳液– 溶剂蒸发法制备酸性微胶囊, 以溶解有乙基纤维素 (ethyl cellulose ether, EC) 的油相包覆盐酸芯材, 并以聚乙烯醇 (polyvinyl alcohol, vinylalcohol polymer, PVA) 作为外水相稳定剂, 构建稳定的 W / O / W 双乳液体系以实现催化剂的有效胶囊化。通过 单因素试验和正交设计优化制备参数, 利用扫描电子显微镜和激光粒度仪表征微胶囊的形貌与粒径分布, 并开展其助破 胶性能评价。结果 使用 2.5 g EC、体积分数为 4.50% 的 Span80、体积分数为 1.0% 的 Tween-60 和质量分数为 2% 的 PVA 稳定 剂制备的微胶囊, 其平均粒径为 201.88 μ m, 粒径分布均匀, 球形度高, 包覆率达到 46.76%。结论 在与自生热气结合过程中, 该微胶囊的多孔壳结构有助于 HCl 的缓慢释放, 在 40 ℃ 的低温条件下成功使压裂液在 2 h 内实现有效破胶, 表现出显著 的延迟破胶效果。该研究对保障低温储层压裂的有效破胶和拓宽微胶囊技术的应用范围具有重要的意义。 [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
