Experiment on the Mechanism of Enhancing Oil Recovery by CO2 Flooding with Gas-soluble Demixing Agent

doi:10.3969/j.issn.1006-6535.2022.01.020

Abstract

Abstract: In view of unclear understanding of the mechanism of reducing mixed-phase pressure and enhancing oil recovery by CO₂ flooding with soluble demixing agent, the demixing mechanism of gas-soluble demixing agent was clarified by analyzing the changes in crude oil composition, crude oil viscosity, oil-gas interfacial tension and crude oil phase characteristics in combination with laboratory experiment, numerical simulation and weight analysis. The experimental results showed that after injecting the gas-soluble demixing agents of 3% and 20% volume fraction, the content of heavy components in crude oil was reduced by 25.07% and 48.21%, the average crude oil viscosity reduced by 61.51% and 96.88%, the interfacial tension between crude oil and CO₂ reduced by 30.36% and 91.16% at the same pressure, and the saturation pressure reduced by 6.22% and 15.90%, respectively. The dominant demixing mechanism of gas-soluble demixing agent was to crack the heavy components of crude oil, reduce the crude oil viscosity and decrease the oil-gas interfacial tension. The study also analyzed the oil displacement mechanism for oil recovery enhancement by mixed injection and plug injection of gas-soluble demixing agent and CO₂, and clarified the seepage characteristics of different affected areas in the formation, namely there was two-phase seepage of CO₂ or gas-soluble demixing agent and formation crude oil in the mixed injection area, and three-phase seepage of CO₂, gas-soluble demixing agent and formation crude oil in the mixed-phased area. This study provides a basis for the optimization and field practice of the gas-soluble demixing agent for CO₂ flooding.

Key words: gas-soluble demixing agent, CO₂ flooding, enhance oil recovery, seepage characteristics, mechanism

CLC Number:

TE345

Sun Dalong, Zhang Guangdong, Peng Xu, Jing Hao, Lyu Hua, Ren Chaofeng, Wang Ning. Experiment on the Mechanism of Enhancing Oil Recovery by CO₂ Flooding with Gas-soluble Demixing Agent[J]. Special Oil & Gas Reservoirs, 2022, 29(1): 134-140.

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Experiment on the Mechanism of Enhancing Oil Recovery by CO₂ Flooding with Gas-soluble Demixing Agent

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