新化学体系对微观剩余油启动机理实验研究

doi:10.11885/j.issn.1674-5086.2023.12.11.01

摘要/Abstract

摘要： 利用大庆油田3 类油层典型层位微流控玻璃模型，通过微观驱油可视化方法、接触角法润湿性测定方法、界面张力测试等手段，深入研究了新型无碱中相体系对微观剩余油启动机理。新体系乳化油滴的粒径更小，增溶效果更强，显著提高了波及体积和洗油效率。新体系相比其他复合体系润湿性能更强，可以在很短时间内实现快速润湿反转，改变润湿性。利用可视化实验手段研究了新体系具有快速形变能力的特性，该特性与其他化学体系相比更加有利于微观剩余油的启动和运移，增加了新体系的注入性能，为新体系扩大波及体积提供了助力。提出了角隅状微观剩余油在储层中另一种存在形态，给出了新体系是通过打破区域压力场平衡而启动这类剩余油的机理。通过研究，明确了新型无碱体系微观剩余油启动和运移机理，为深化研究新型无碱体系驱油机理提供了技术手段和支撑。

关键词: 无碱中相, 微观剩余油类型, 化学驱油, 启动及运移机理, 实验研究

Abstract: Based on the microfluidic glass model of three typical oil layers in Daqing Oilfield, the start-up mechanism of the new alkali-free medium phase system on the micro residual oil was studied by means of microscopic oil displacement visualization, contact angle wettability measurement and interfacial tension measurement instruments. The new system has smaller particle size and stronger solubilization effect of emulsified oil droplets, and significantly improves the swept volume and oil washing efficiency. Compared with other composite systems, the new system has stronger wettability and can achieve rapid wettability reversal in a very short time to change the wettability. In this paper, the rapid deformation ability of the new system is studied by means of visual experiment. Compared with other chemical systems, this property is more conducive to the start-up and migration of micro-residual oil, increases the injection performance of the system, and provides help for the expansion of the sweep volume of the system. Another existing form of corner micro-residual oil in the reservoir is proposed, and the mechanism that the new system starts this kind of residual oil by breaking the regional pressure field balance is given. Through the research, the micro-residual oil start-up and migration mechanism of the new alkali-free system is defined, which provides technical means and support for further research on the oil displacement mechanism of the new alkali-free system.

Key words: alkali-free medium phase, type of microscopic remaining oil, chemical flooding, initiation and migration mechanism, experimental research

中图分类号:

TE327

魏洪涛, 张晓芹, 关文婷, 杨丰瑞, 周宇. 新化学体系对微观剩余油启动机理实验研究[J]. 西南石油大学学报(自然科学版), 2025, 47(6): 178-186.

WEI Hongtao, ZHANG Xiaoqin, GUAN Wenting, YANG Fengrui, ZHOU Yu. An Experimental Study on Start-up Mechanism of Micro-residual Oil by New Chemical System[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(6): 178-186.

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