Nanoparticle-Enhanced Water-Based-Emulsion Fracturing Fluid for Improved Imbibition Recovery in Unconventional Reservoirs: Performance and Mechanism

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-03-01 DOI:10.2118/219739-pa

Mengjiao Cao, Ruoyu Wang, Yuchen Li, Caili Dai, Xiang Yan, Liyuan Zhang, Yining Wu

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引用次数: 0

Abstract

The conventional friction reducer, typically a water-in-oil (W/O) emulsion, used in slickwater, encounters challenges related to poor environmental friendliness, limited stability, and low activity, hindering its widespread applicability. In this study, we synthesized a water-based emulsion through water dispersion polymerization, incorporating nanoparticles (NPs) into the process to enhance the stability and activity of the polymer emulsion. The result is an environmentally friendly, oil-phase-free, instantly dissolution, and highly efficient friction reducer, intended to optimize the utilization efficiency of slickwater. The NP-enhanced water-based emulsion demonstrated a consistent and spherical dispersion, featuring an average particle size of ~10 μm, maintaining stability for more than 6 months. With rapid dissolution in water, achieved within a mere 38 seconds, it facilitated continuous on-the-fly mixing. Slickwater composed of this emulsion exhibited outstanding application performance, yielding a remarkable 76% reduction in pipeline friction. The presence of NPs and specific monomers facilitated the formation of a spatial network structure that maintains high temperature/shear resistance even after prolonged shear. Moreover, the system exhibited an exceptional capacity for imbibition oil production. Indoor spontaneous imbibition experiments showed a final recovery rate of 32.41% in tight oil cores (~10% higher than conventional systems), and imbibition depth reached 40.2 mm (1.2-fold increase compared with traditional systems). Field experiments were conducted in a tight oil reservoir to validate practical applications; the results further validated the effectiveness of the novel system. The treated wells showcased rapid oil production, reaching an average daily production rate of 55.8 t/d and water content as low as ~31%, satisfying the predicted production target.

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纳米颗粒增强型水基乳液压裂液用于提高非常规储层的浸润采收率：性能与机理

传统的减摩剂通常是油包水（W/O）乳液，用于浮油水时遇到了环境友好性差、稳定性有限和活性低等挑战，阻碍了其广泛应用。在本研究中，我们通过水分散聚合法合成了一种水基乳液，并在此过程中加入了纳米粒子 (NPs)，以提高聚合物乳液的稳定性和活性。其结果是一种环保、无油相、瞬间溶解、高效的减摩剂，旨在优化浮油水的利用效率。经 NP 增强的水基乳液具有稳定的球形分散性，平均粒径约为 10 μm，可在 6 个月内保持稳定。它在水中的溶解速度极快，仅需 38 秒就能完成，有利于连续的即时混合。由这种乳液组成的 Slickwater 具有出色的应用性能，可显著减少 76% 的管道摩擦。NPs 和特定单体的存在促进了空间网络结构的形成，即使在长时间剪切后也能保持较高的耐温/抗剪性能。此外，该系统还表现出卓越的浸润产油能力。室内自发浸润实验显示，致密油岩心的最终采收率为 32.41%（比传统体系高出约 10%），浸润深度达到 40.2 毫米（比传统体系增加了 1.2 倍）。为验证实际应用，在致密油藏中进行了现场实验；结果进一步验证了新型系统的有效性。经过处理的油井显示出快速的石油生产，平均日产量达到 55.8 吨/天，含水率低至 ~31%，达到了预测的生产目标。

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico