Design Method and Application of ASP Flooding System Based on Emulsion Seepage Mechanism

doi:10.3969/j.issn.1006-6535.2021.02.022

Abstract

Abstract: In the field experiment of ASP (alkali, surfactant, polymer) flooding in Daqing Oilfield, the produced liquid of crude oil was seriously emulsified, but the migration law of the produced emulsion and its effect on enhancing recovery efficiency are unclear. Therefore, the long core model experiment was conducted to clarify the mechanism of emulsion seepage and flooding. The results show that after injection based on the actual formula of ASP flooding system, the emulsifying capacity was continuously weakened with the increase of the migration distance, the emulsifying slug was produced when the pore volume was 0.40 time and ended when the pore volume was 0.60 time, and the length of the emulsifying slug was 0.20 time the pore volume. The results of flooding experiment show that the optimal displacement slug size was 0.30 time the pore volume, and the actual emulsifying slug did not reach the optimal size, so the injection time of ASP system should be extended. The experiment truly reflected the emulsification process of the ASP flooding under the formation conditions, and clarified the emulsification law and the influence of the emulsion slug on the flooding effect, with important guiding significance for on-site adjustment.

Key words: ASP flooding, emulsion, migration law, long core model

CLC Number:

TE357

Yue Qing. Design Method and Application of ASP Flooding System Based on Emulsion Seepage Mechanism[J]. Special Oil & Gas Reservoirs, 2021, 28(2): 144-149.

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