Study of a small molecule gel fracturing fluid and its in situ conversion into an efficient oil displacement agent

IF 2.7 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Jingwen Yang, Bo Liu, Tianjiang Wu, Pengcheng Zhou, Qiaona Liu, Ying Tang, Hai Huang and Gang Chen
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Abstract

Viscoelastic surfactants (VESs) are critical components of water-based fracturing fluids. However, the challenges related to the large volumes and complex disposal of flowback fluids from conventional VES fracturing fluids remain unresolved. Accordingly, a multifunctional small molecule surfactant gel was successfully prepared in this study. This system exhibits the capacity of in situ gel-breaking and converting it into an oil displacement agent, thus achieving the goal of no fluid return. The gel was composed of erucic acid amidopropyl betaine (EAPB), oleic acid amidopropyl betaine (OAPB), and a thickening agent, and the system was referred to as EOO. On the basis of this gel system, a series of performance parameters have been evaluated through extensive experiments. The research results demonstrated that this gel exhibits good stability, viscoelasticity, sand-carrying capacity, and remarkable self-repairing ability at high shear rates. Additionally, the gel achieves ultra-low interfacial tension and wetting reversal characteristics, both of which are conducive to enhanced oil recovery. Oil displacement and profile control of the gel were evaluated using single and parallel core flooding experiments. The results indicated that the EOO gel increased injection pressure in high-permeability cores and mobilized residual oil in low-permeability cores, thereby expanding the swept volume and enhancing recovery. The small molecule gel developed in this study which can be converted in situ into an oil displacement agent is a candidate for enhanced oil recovery in low-permeability oil fields.

Abstract Image

小分子凝胶压裂液及其原位转化为高效石油置换剂的研究
粘弹性表面活性剂(VES)是水基压裂液的关键成分。然而,传统 VES 压裂液的回流液量大、处理复杂,这些难题仍未得到解决。因此,本研究成功制备了一种多功能小分子表面活性剂凝胶。该系统具有原位破胶能力,可将其转化为石油置换剂,从而实现无回流目标。凝胶由芥酸酰胺丙基甜菜碱(EAPB)、油酸酰胺丙基甜菜碱(OAPB)和增稠剂组成,该体系被称为 EOO。在该凝胶系统的基础上,通过大量实验对一系列性能参数进行了评估。研究结果表明,这种凝胶具有良好的稳定性、粘弹性和携砂能力,并在高剪切速率下具有显著的自我修复能力。此外,该凝胶还具有超低界面张力和润湿反转特性,这两种特性都有利于提高石油采收率。利用单个和平行岩心浸润实验对凝胶的石油位移和剖面控制进行了评估。结果表明,EOO凝胶增加了高渗透率岩心中的注入压力,并调动了低渗透率岩心中的残余石油,从而扩大了扫油体积,提高了采收率。本研究开发的小分子凝胶可就地转化为石油置换剂,是低渗透油田提高石油采收率的候选材料。
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来源期刊
New Journal of Chemistry
New Journal of Chemistry 化学-化学综合
CiteScore
5.30
自引率
6.10%
发文量
1832
审稿时长
2 months
期刊介绍: A journal for new directions in chemistry
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