Evaluation of EOR Effect of Gas Huff-n-puff in Fractured Vuggy Carbonate Reservoirs

doi:10.11885/j.issn.1674-5086.2015.04.24.01

Abstract

Abstract: Large water-eroded caves, solution pores, and fractures are the main spaces of fractured vuggy carbonate reservoirs with strong heterogeneity. The technology of gas huff-n-puff is an effective way to improve oil recovery in such reservoirs. In this study, an indoor physical simulation apparatus was designed and produced for carbonate reservoirs in order to explore the huff-n-puff effect of different gases. The huff-n-puff effect and its mechanism for four gases(CO₂, N₂, CO₂ injected before N₂, CO₂ injected after N₂) were analyzed considering the parameters of oil change rate, gas generation rate, and cumulative gas production. The experimental results show that the huff-n-puff mechanism of the four injected gases is obvious. The lowest oil change rate was 0.422(N₂ huff-n-puff). The mixed gas (CO₂ and N₂ mixture) huff-n-puff fully develops a synergistic effect. CO₂ dissolved in crude oil decreases oil viscosity, while N₂ occupies the high positions of caves and forms a gas cap due to gravitational differentiation. The huff-n-puff effect of the gaseous mixture of CO₂ and N₂ is better than that of a single gas, and CO₂ injection after N₂ huff-n-puff can achieve the best effect with an oil change rate of 0.861. Experimental research shows that gas huff-n-puff is an effective EOR, and the huff-n-puff effect of CO₂ injected after N₂ is more remarkable.

Key words: fractured-vuggy heavy oil reservoir, gas injection huff-n-puff, huff-n-puff physical simulation, CO₂, N₂, enhanced oil recovery

CLC Number:

TE327

SU Wei, HOU Jirui, LIU Juan, ZHU Daoyi, XI Yuanyuan. Evaluation of EOR Effect of Gas Huff-n-puff in Fractured Vuggy Carbonate Reservoirs[J]. 西南石油大学学报(自然科学版), 2017, 39(1): 133-139.

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