致密油藏微观孔隙结构中二氧化硅基纳米流体的自发和动态浸润特性分析

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2024-11-11 DOI:10.1021/acs.langmuir.4c03577

Tiantian Zhang, Caili Dai, Kongjie Wang, Zhiping Li, Mingwei Gao, Caspar Daniel Adenutsi, Mingwei Zhao

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引用次数: 0

摘要

浸润行为在致密油藏开发中起着至关重要的作用，为提高致密油产量，开发了一种新型月桂醇醚硫酸钠（SLES）纳米流体。利用在线低场核磁共振（LF-NMR）技术系统研究了纳米流体的自发和动态浸润性能及其相关影响因素。进一步探讨了纳米流体在致密油藏中提高基质原油采收率的微观动员特性和机理。实验结果表明，所提出的 SLES 纳米流体实现了最高的浸润效率，适当浓度的纳米粒子和表面活性剂有助于提高浸润采收率。过高的化学剂浓度可能会堵塞微孔。应确定合理的注入速度和关闭时间，以充分发挥毛细管力对水相浸润和油相置换的作用，以及纳米流体提供的粘性力和增加岩石表面水润湿性的置换效应。此外，在动态浸润过程中，采用核磁共振 T2 截止值来区分浸润区和置换区。纳米流体和去离子水浸润后的 T2 截断值对应的孔隙尺寸分别为 0.6 和 5 μm，表明与去离子水相比，纳米流体大大增加了致密油藏孔隙中的可移动原油。此外，纳米流体在微孔（0.1 μm）和中孔（0.1-1 μm）中的浸润行为占主导地位，而位移主要发生在微裂缝和大孔隙中。最后，纳米流体提高采油率的基本机制与润湿性改变、毛细管压力和粘性力有关。这项研究进一步了解了在致密油藏中使用纳米流体时的自发和动态浸润。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Analysis of Spontaneous and Dynamic Imbibition Characteristics of Silica-Based Nanofluid in Microscopic Pore Structure of Tight Oil Reservoirs

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Analysis of Spontaneous and Dynamic Imbibition Characteristics of Silica-Based Nanofluid in Microscopic Pore Structure of Tight Oil Reservoirs

Imbibition behavior plays a crucial role in tight oil reservoir development, to increase tight oil production, a novel sodium lauryl ether sulfate (SLES) nanofluid was developed. Spontaneous and dynamic imbibition performance of nanofluid and the relative influencing factors were systematically investigated using the online low-field nuclear magnetic resonance (LF-NMR) technique. The microscopic mobilization characteristics and mechanism of nanofluid-enhanced matrix crude oil recovery in tight oil reservoirs were further explored. The experimental results showed that the proposed SLES nanofluid achieved the highest imbibition efficiency, and appropriate concentrations of nanoparticle and surfactant were helpful in enhancing the imbibition recovery. Excessive concentrations of chemical agents may block the tiny pores. A reasonable injection rate and shut-in time should be determined to fully leverage capillary forces for water phase imbibition and oil phase displacement as well as the displacement effect of the viscous force and increased water wetness of the rock surface provided by the nanofluid. In addition, NMR T₂ cutoff was applied to distinguish the imbibition and displacement regions during dynamic imbibition process. The pore sizes corresponding to the T₂ cutoff values after nanofluid and deionized (DI) water flooding were 0.6 and 5 μm, indicating that nanofluid considerably increased the movable crude oil in pores of tight oil reservoirs compared with DI water. Furthermore, imbibition behavior was dominant in micropores (<0.1 μm) and mesopores (0.1–1 μm), and displacement principally occurred in microfractures and macropores. Finally, the underlying mechanisms responsible for nanofluid enhanced oil recovery were related to wettability alteration, capillary pressure, and viscous force. This work provides further understanding of spontaneous and dynamic imbibition when employing nanofluid in tight oil reservoirs.

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).