纳米流体辅助低盐碱聚合物自吸提高砂岩油藏采收率

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-04-05 DOI:10.1016/j.molliq.2025.127533

Gomathi Rajalakshmi Seetharaman , N.P. Devakumar , Minal Deshmukh , Jitendra S. Sangwai

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引用次数: 0

摘要

自发渗吸在提高原油采收率（EOR）中起着至关重要的作用。在这项工作中，探索了低矿化度水、碱、聚合物和纳米颗粒的协同作用，作为砂岩油藏低酸值原油的潜在采收率剂。将不同浓度（100-1000 ppm）的二氧化硅纳米颗粒（15 nm）分散在含有碳酸钠（碱）和聚丙烯酰胺（PAM，聚合物）的低盐度水（lowsal）中，称为低盐碱聚合物纳米流体（LSAP-NFs）。在50°C下进行界面张力（IFT）和接触角测量，以了解LSAP-NFs通过自发渗吸对提高采收率的影响。结果表明，聚合物的较大分子尺寸阻碍了碱降低IFT和改变润湿性的作用。在50°C的条件下，利用Amott电池和Berea砂岩岩心样品对LSAP-NFs的渗吸效率进行了评估。自发渗吸结果表明，LSAP- nfs的渗吸效果高于单碱、LSAW和LSAP驱油剂。利用原子力显微镜（AFM）的F-D模式分析了固液界面力，研究了吸胀的主要机理。界面机制，包括IFT、润湿性、表面粗糙度和固液界面力，证实了吸胀过程同样受到重力和毛细力的控制。此外，固液界面力暴露出具有二氧化硅纳米流体的完全亲水表面，证实了毛细力在吸胀中起主导作用。这项工作确定了自发渗吸影响提高原油采收率的基本机制。

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Enhanced oil recovery by spontaneous imbibition of nanofluid assisted low saline alkali polymer in sandstone reservoir

Spontaneous imbibition plays a crucial role in enhanced oil recovery (EOR). In this work, the synergistic effect of low salinity water, alkali, polymer, and nanoparticles was explored as a potential oil recovery agent for low acid number crude oil in a sandstone reservoir. Silica nanoparticles (15 nm) at various concentrations (100–1000 ppm) were dispersed in low salinity water (lowsal) containing sodium carbonate (alkali) and polyacrylamide (PAM, polymer), referred to as low saline-alkali-polymer-nanofluid (LSAP-NFs). Interfacial tension (IFT) and contact angle measurements were performed at 50 °C to understand the impact of LSAP-NFs on EOR through spontaneous imbibition. The results showed that the larger molecular size of the polymer hindered the effect of alkali in reducing the IFT and altering the wettability. The imbibition efficiency of the LSAP-NFs was evaluated using an Amott cell at 50 °C with Berea sandstone core samples. The spontaneous imbibition results showed that the imbibition effectiveness of the LSAP-NFs was higher than that of simple alkali, LSAW, and LSAP flooding agents. The prominent mechanism of imbibition was studied by analyzing the solid–liquid interfacial force using F-D mode from Atomic Force Microscope (AFM) investigations. The interfacial mechanisms, including IFT, wettability, surface roughness, and solid–liquid interfacial forces, confirmed that the imbibition process is equally controlled by gravity and capillary forces. Further, the solid–liquid interfacial force exposed a fully hydrophilic surface with silica nanofluid, confirming that capillary force dominates imbibition. This work identifies the fundamental mechanism by which spontaneous imbibition impacts enhanced oil recovery.

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.