Profile control and oil displacement in high temperature and salinity reservoirs: Evaluation of deformable microgel system

IF 3.1 4区工程技术 Q2 POLYMER SCIENCE

Polymers for Advanced Technologies Pub Date : 2024-08-01 DOI:10.1002/pat.6530

Hossein Pahlevani, Mahsa Baghban Salehi, Farzin Saghandali, Rouzbeh G. Moghanloo, Vahid Taghikhani

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引用次数: 0

Abstract

Viscoelastic microgels have been successfully used as profile control and enhanced oil recovery agents in oil reservoirs. In this paper, a novel microgel made of acrylamide monomer and 2‐Acrylamido‐2‐methylpropane sulfonic acid was synthesized using inverse emulsion polymerization. The spherical shape of microgel particles and their corresponding size distribution were confirmed by series of microscopic images. Additional tests such as morphology and swelling tests indirect characterization of structural properties via rheology tests, and viscoelastic tests of spherical microgels were performed for 5 different aqueous solutions. The flow curve of all aqueous solutions illustrated three areas of shear thinning, static state, and shear thickening representing presence of dispersed system and confirming formation of microgel suspension. According to results of the oscillatory frequency sweep test “superior” viscoelastic properties were demonstrated. Also, no structural fracture occurred in the frequency range of 0.01–100 Hz with elastic modulus of 105, 3.63, 2.4, 3, and 1.6, respectively. Furthermore, excellent swelling properties were observed in presence of monovalent, divalent ions, and brine. In addition, performance of microspheres microgel suspension (MMS) in formation water were evaluated using a micro and macro floodingexperiment setup. Due to the elastic modulus of microgel system (2.4 Pa) and its viscoelastic properties, deformation capability and the ability to maintain initial shape of microgels, the oil recovery was increased to 83.77, which was 2.02 times more than that of water flooding displacement. The MMS macro‐flooding test indicated the alteration of the core from oil‐wet to water‐wet. Also, the pressure drop created during water injection compared to during oil injection increased from 0.67 to 9.62 after treatment with MMS. The characteristics and displacement performance of a deformable microgel make it a good candidate for in‐depth gel treatment and sweep efficiency improvement.

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高温高盐油藏中的剖面控制和石油位移：对可变形微凝胶系统的评估

粘弹性微凝胶已被成功用作油藏的剖面控制和提高采收率剂。本文采用反乳液聚合法合成了一种由丙烯酰胺单体和 2-丙烯酰胺基-2-甲基丙烷磺酸组成的新型微凝胶。一系列显微图像证实了微凝胶颗粒的球形形状及其相应的尺寸分布。此外，还对 5 种不同的水溶液进行了其他测试，如通过流变测试间接鉴定结构特性的形态和膨胀测试，以及球形微凝胶的粘弹性测试。所有水溶液的流动曲线都显示出剪切变稀、静止状态和剪切变稠三个区域，表明存在分散体系，并确认形成了微凝胶悬浮液。振荡频率扫描试验的结果表明，微凝胶具有 "卓越的 "粘弹性能。此外，在 0.01-100 Hz 的频率范围内没有发生结构断裂，弹性模量分别为 105、3.63、2.4、3 和 1.6。此外，在存在一价、二价离子和盐水的情况下，微球都具有极佳的溶胀特性。此外，还使用微观和宏观水浸实验装置评估了微球微凝胶悬浮液（MMS）在地层水中的性能。由于微凝胶体系的弹性模量（2.4 Pa）及其粘弹性能、变形能力和保持微凝胶初始形状的能力，采油率提高到 83.77，是水淹位移的 2.02 倍。MMS 宏观充水试验表明，岩心已从油湿变为水湿。此外，经 MMS 处理后，注水时产生的压降与注油时相比从 0.67 增加到 9.62。可变形微凝胶的特性和位移性能使其成为深入凝胶处理和提高扫油效率的良好候选材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymers for Advanced Technologies 工程技术-高分子科学

CiteScore

6.20

自引率

5.90%

发文量

337

审稿时长

2.1 months

期刊介绍： Polymers for Advanced Technologies is published in response to recent significant changes in the patterns of materials research and development. Worldwide attention has been focused on the critical importance of materials in the creation of new devices and systems. It is now recognized that materials are often the limiting factor in bringing a new technical concept to fruition and that polymers are often the materials of choice in these demanding applications. A significant portion of the polymer research ongoing in the world is directly or indirectly related to the solution of complex, interdisciplinary problems whose successful resolution is necessary for achievement of broad system objectives. Polymers for Advanced Technologies is focused to the interest of scientists and engineers from academia and industry who are participating in these new areas of polymer research and development. It is the intent of this journal to impact the polymer related advanced technologies to meet the challenge of the twenty-first century. Polymers for Advanced Technologies aims at encouraging innovation, invention, imagination and creativity by providing a broad interdisciplinary platform for the presentation of new research and development concepts, theories and results which reflect the changing image and pace of modern polymer science and technology. Polymers for Advanced Technologies aims at becoming the central organ of the new multi-disciplinary polymer oriented materials science of the highest scientific standards. It will publish original research papers on finished studies; communications limited to five typewritten pages plus three illustrations, containing experimental details; review articles of up to 40 pages; letters to the editor and book reviews. Review articles will normally be published by invitation. The Editor-in-Chief welcomes suggestions for reviews.