Pore-scale study of the effects of DTPA chelating agent flooding on oil recovery utilizing a clay-coated micromodel

Q1 Earth and Planetary Sciences Petroleum Research Pub Date : 2024-06-01 DOI:10.1016/j.ptlrs.2023.11.001
Hojjat Mohammadzadeh, Jamshid Moghadasi, Khalil Shahbazi, Shahin Kord
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Abstract

The use of diethylenetriaminepentaacetic acid (DTPA) chelating agent has shown promising results for enhanced oil recovery (EOR) in prior research. Several mechanisms, mainly resulting from rock-fluid interaction, have been proposed for chelating agent flooding; however, little attention has been paid to fluid-fluid interaction thus far. The assessment of these mechanisms has primarily relied on macroscopic techniques such as core flooding. This paper aims to investigate the injection of DTPA brine and its dominant mechanisms at the pore scale using a clay-coated micromodel. The micromodel tests were performed under oil-wet and water-wet states. For a more precise examination of fluid/fluid interactions, the dynamic interfacial tension (IFT) and Zeta potential were measured. It was observed that the injection of DTPA brine in water-wet state changed the saturation distribution and increased oil recovery. Based on visual inspections, this change in saturation distribution could potentially be linked to the formation of micro-dispersions and viscoelastic interfacial phenomena. Micro-dispersions facilitate flow to unswept areas, and viscoelastic interface formation reshapes the interface between oil and brine, causing disconnected oil droplets to coalesce and thus increase recovery. Under the oil-wet state, the micro-dispersion formation and wettability alteration can be the dominant mechanisms, and the amount of recovered oil was higher than that observed in the water-wet state. Furthermore, Zeta potential measurements at the interface between brine and oil showed a more negative value for DTPA brine, which is effective in wettability alteration and micro-dispersions stability. The results indicate that IFT reduction was not significant enough to be considered the dominant mechanism, although it assists in DTPA brine penetration into the crude oil and subsequent micro-dispersion formation.

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利用粘土涂层微模型对 DTPA 螯合剂淹没对采油的影响进行孔隙尺度研究
在之前的研究中,二乙烯三胺五乙酸(DTPA)螯合剂在提高石油采收率(EOR)方面的使用已显示出良好的效果。已经提出了螯合剂泛滥的几种机制,主要是岩石与流体之间的相互作用;但迄今为止,人们很少关注流体与流体之间的相互作用。对这些机制的评估主要依赖于宏观技术,如岩心充水。本文旨在利用粘土涂层微模型研究 DTPA 盐水的注入及其在孔隙尺度上的主导机制。微模型试验是在油湿和水湿状态下进行的。为了更精确地检验流体/流体之间的相互作用,还测量了动态界面张力(IFT)和 Zeta 电位。据观察,在水湿状态下注入 DTPA 盐水改变了饱和度分布,提高了采油率。根据目测,饱和度分布的这种变化可能与微分散体的形成和粘弹性界面现象有关。微分散有利于油液流向未扫过的区域,而粘弹性界面的形成则重塑了油和盐水之间的界面,使断开的油滴凝聚在一起,从而提高了采收率。在油湿状态下,微分散的形成和润湿性的改变可能是主要的机制,采出的油量比在水湿状态下观察到的要高。此外,盐水和油界面的 Zeta 电位测量结果表明,DTPA 盐水的 Zeta 电位为负值,这对润湿性改变和微分散的稳定性很有效。结果表明,虽然 IFT 的降低有助于 DTPA 盐水渗透到原油中并随后形成微分散体,但其作用并不显著,不足以被视为主要机制。
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来源期刊
Petroleum Research
Petroleum Research Earth and Planetary Sciences-Geology
CiteScore
7.10
自引率
0.00%
发文量
90
审稿时长
35 weeks
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