An Experimental Study on Start-up Mechanism of Micro-residual Oil by New Chemical System

doi:10.11885/j.issn.1674-5086.2023.12.11.01

Abstract

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

CLC Number:

TE327

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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