2-D智能纳米黑卡微观驱油机理可视化实验*

Microscopic Flooding Mechanism Experiment Visualization of 2-D Smart Black Nano-card

吴伟鹏 侯吉瑞 屈 鸣 闻宇晨 梁 拓 杨景斌 赵梦丹

WU Weipeng HOU Jirui QU Ming WEN Yuchen LIANG Tuo YANG Jinbin ZHAO Mengdan

由中国石油大学（北京）非常规油气科学技术研究院自主研发的2-D智能纳米黑卡是一种具有尺寸小、比表面积大等优势的片状纳米材料（尺寸为80×60×1.2 nm，比表面积约57m2/g）。本文使用不同孔隙度、渗透率的二维可视化模型，进行2-D智能纳米黑卡微观驱替可视化实验。通过分析岩心渗透率、颗粒浓度和注入速率等因素对驱油效果的影响，研究在微观条件下该纳米材料的微观渗流机理和运移规律。研究表明，该材料具有优异的亲水亲油平衡性，能够改变岩石表面润湿性，在两相界面产生楔形渗透压，形成微观回旋流，相对于以往如SiO2等球型纳米颗粒，具有更大的表面接触性。2-D智能纳米黑卡可有效驱替地层剩余油，剥离微小孔喉壁面上的油膜，扩大低渗层波及体积，提高原油采收率。图38参22

The 2-D smart black nano-card is a new nanosheet material which is independently developed by the institute of enhanced oil recovery from china university of Petroleum（Beijing）. The nano-card has the advantages of small size（80×60×1.2 nm）and large specific surface area（57 m2/g）. In this paper，2-D smart black nano-card displacement experiments was carried out with different porosity and permeability two-dimensional visualized models. Through analyzing the influence factors such as core permeability， particle concentration and injection rate on oil displacement effect，the migration rules and microscopic seepage mechanism of the 2-D smart black nano-card system were studied. The experiment results revealed that the nano-card had advantage hydrophile-lipophile balance（HLB）. The wettability of the rock surface could be changed，the wedge osmotic pressure could be generated by the two-phase interface，and the microscopic cyclotron could be formed. Besides that，nano-card had enormous surface contact compared with previous spherical nanoparticles such as SiO2. Therefore，nano-card could effectively displace the remaining oil from the formation，peel off the oil film on the throat wall on micro pores，expand the sweep volume of the low permeability layer，and thus，improve the degree of the crude oil recovery.

10.19346/j.cnki.1000-4092.2020.01.023