Experimental Study on Development Characteristics of Supercritical CO2 Huff and Puff in Tight Oil Reservoirs

doi:10.3969/j.issn.1006-6535.2021.01.019

Abstract

Abstract: In view of the rapid decline in oil recovery rate in tight oil reservoirs of the Ordos Basin and the inability to maintain reservoir pressure, the development method with CO₂ huff and puff was discussed, and the experimental study on supercritical CO₂ huff and puff with long core was carried out. The mechanism, development characteristics and influencing factors of supercritical CO₂ huff and puff in enhancing tight oil recovery were explored. The influence of key operating parameters, such as gas injection rate, gas injection phase, pressure holding with N₂, and depletion pressure, on tight oil recovery was discussed. The study shows that: supercritical CO₂ huff and puff can effectively improve tight oil recovery, with effect better than conventional CO₂ huff and puff. Gas injection rate has little effect on oil recovery. Injection N₂ to hold pressure can significantly improve tight oil recovery and oil exchange rage. The first three cycles of huff and puff are of best effect, accounting for 91.5% of the total oil recovery. The research result confirmed the feasibility and huge application potential of supercritical CO₂ huff and puff in improving tight oil recovery, and can provide theoretical basis and technical support for the efficient development of tight oil reservoirs in the Ordos Basin.

Key words: supercritical CO₂, huff and puff experiment, tight oil reservoir, enhancing oil recovery, influencing factor, ordos Basin

CLC Number:

TE357.45

Zhang Yueqi, Gou Lipeng, Qiao Wenbo, Yu Yao, Wang Qingzhen, Chen Ming, Yu Ying, Zhang Maolin. Experimental Study on Development Characteristics of Supercritical CO₂ Huff and Puff in Tight Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 130-135.

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Experimental Study on Development Characteristics of Supercritical CO₂ Huff and Puff in Tight Oil Reservoirs

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