An Experimental Study on the Optimization of Converting Time of Binary Combination Flooding Systems

doi:10.11885/j.issn.1674-5086.2018.12.07.03

Abstract

Abstract: Polymer flooding exacerbates the heterogeneity of the reservoir and the difficulty of starting the sweep of the remaining oil. The use of combination flooding to reduce the synergy between interfacial tension and fluidity control can further enhance oil recovery. Indoor flooding experiments and converting time studies were carried out using combination systems with different performances. The results show that the ratio of fluidity control and the reduction in interfacial tension to the oil displacement effect in the combination system is 1.2:1.0. Using the difference between the water flooding characteristics and the subsequent water flooding characteristic formulas of different nodes, a quick determination of optimal converting time for polymer flooding was established; i.e., the effect is best when the converting time occurs at the end of the polymer flooding and the beginning of the subsequent water flooding phase. The optimized compound system under the experimental conditions is primarily based on fluidity control, and the interfacial tension is reduced to 10^-1~10^-2 mN/m. The best converting time for compound flooding is at the beginning of the subsequent water flooding 0.14 PV after the end of the polymer flooding, which is suitable for excavating the oil remaining after polymer flooding.

Key words: polymer flooding, binary compound flooding, fluidity control, interfacial tension, water flooding characteristics, converting time

CLC Number:

TE345

ZHANG Xiaoqin, ZHU Shijie, SHI Leiting. An Experimental Study on the Optimization of Converting Time of Binary Combination Flooding Systems[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 120-126.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2018.12.07.03

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