CO2萃取作用对最小混相压力的影响实验研究

Abstract

Abstract:

In order to clarify the effect of extraction on miscible pressure during CO₂ flooding and make clear the characteristics of minimum miscible pressure of gas front or after gas sweep, the CO₂ extraction rate under different pressure and the distribution characteristics of oil components in the extraction process are studied by the extraction experiments under high temperature and chromatographic analysis. The changes of minimum miscible pressure of extracted oil and residual oil are quantitatively analyzed by the interfacial tension vanishing method. Under the experimental condition of 95 ℃ and 10 ~ 45 MPa, the supercritical CO₂ can extract the components of each carbon number of the crude oil, and more than 80 % of the extracted oil is C_5-20. The extraction rate of supercritical CO₂ and the minimum miscibility pressure of extracted oil and residual oil are positively correlated with the extraction pressure. Under the influence of extraction and pressure, the minimum miscible pressure in the CO₂ displacement and migration process is a dynamic value, which reduces in the following order: residual oil, crude oil and extracted oil. The minimum miscibility pressure of extracted oil and residual oil is related to component distribution. The critical components affecting miscibility in formation oil are C_5-10 and C₂₆₊ components. The study result provides good reference for CO₂miscible displacement design and miscible phase prediction.

Key words: CO₂ extraction rate, distribution characteristics of oil components, minimum miscible pressure, formation oil critical component, CO₂ flooding

CLC Number:

TE357

Guixue QI. Effect of CO₂ extraction on minimum miscibility pressure[J]. Reservoir Evaluation and Development, 2019, 9(6): 51-55.

Figures/Tables 12

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Effect of CO₂ extraction on minimum miscibility pressure

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Effect of CO2 extraction on minimum miscibility pressure

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Effect of CO₂ extraction on minimum miscibility pressure