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用于非均质油藏流动性控制的Janus纳米颗粒设计

Design of Janus Nanoparticles for Mobility Control in Heterogeneous Reservoirs.

作者信息

Zang Long, Hu Miaomiao, Cao Jie, Cheng Yun, Li Pengpeng, Guo Jintang, Zhang Hang

机构信息

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.

Zhejiang Institute of Tianjin University, Shaoxing, Zhejiang 312300, China.

出版信息

ACS Omega. 2024 Mar 26;9(14):16536-16546. doi: 10.1021/acsomega.4c00317. eCollection 2024 Apr 9.

DOI:10.1021/acsomega.4c00317
PMID:38617606
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11007849/
Abstract

Unfavorable mobility ratios in heterogeneous reservoirs have resulted in progressively poor waterflood sweep efficiency and diminishing production. In order to address this issue, our study has developed amphiphilic-structured nanoparticles aimed at enhancing the microscopic displacement capability and oil displacement efficiency. First, the transport process of Janus nanoparticles in porous media was investigated. During the water flooding, Janus nanoparticle injection, and subsequent water flooding stages, the injection pressure increased in a "stepped" pattern, reaching 0.023, 0.029, and 0.038 MPa, respectively. Second, emulsification effects and emulsion viscosity experiments demonstrated that the amphiphilic structure improved the interaction at the oil-water interface, reducing the seepage resistance of the oil phase through emulsification. In porous media, Janus nanoparticles transported with water exhibit 'self-seeking oil' behavior and interact with the oil phase, reducing the viscosity of the oil phase from 19 to 5 mPa·s at 80 °C. Finally, the core model displacement experiment verified the characteristics of Janus nanoparticles in improving the oil-water mobility ratio. Compared with the water flooding stage, the recovery percent increased by 20.8%, of which 13.7% was attributed to the subsequent water flooding stage. Utilizing the asymmetry of the Janus particle structure can provide an effective path to enhanced oil recovery in inhomogeneous reservoirs.

摘要

非均质油藏中不利的流度比导致水驱波及效率逐渐变差，产量递减。为解决这一问题，我们的研究开发了具有两亲结构的纳米颗粒，旨在提高微观驱替能力和驱油效率。首先，研究了Janus纳米颗粒在多孔介质中的运移过程。在水驱、注入Janus纳米颗粒以及后续水驱阶段，注入压力呈“阶梯式”上升，分别达到0.023、0.029和0.038MPa。其次，乳化效果和乳液黏度实验表明，两亲结构改善了油水界面的相互作用，通过乳化降低了油相的渗流阻力。在多孔介质中，随水运移的Janus纳米颗粒表现出“自寻油”行为，并与油相相互作用，在80℃下将油相黏度从19mPa·s降至5mPa·s。最后，岩心模型驱替实验验证了Janus纳米颗粒在改善油水流动度比方面的特性。与水驱阶段相比，采收率提高了20.8%，其中13.7%归因于后续水驱阶段。利用Janus颗粒结构的不对称性可为非均质油藏提高采收率提供有效途径。

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