Experiment on Influencing Factors of Natural Depletion of Fractured-Vuggy Condensate Gas Reservoirs

doi:10.3969/j.issn.1006-6535.2022.04.013

Abstract

Abstract: In order to investigate the influencing factors of the natural depletion effect of condensate gas reservoirs, a block of condensate gas reservoirs in Tarim Basin was selected as the study object, and experiments on the recovery efficiency of gas condensate and natural gas with different depressurizing rates and different fracture-vug locations were performed through artificial holes made in carbonate cores to analyze the changes in the gas-oil ratio and the components of produced gas. The experimental results showed that, the depressurizing rate was positively correlated with the recovery efficiency of gas condensate and natural gas; the recovery efficiency was the largest when the fracture-cavity was in the upper position of the target layer, the second in the lateral position, and the smallest in the lower position; the gas-oil ratio presented a trend of first decreasing and then increasing, and the pores of the carbonate fracture and vug caused the dew point pressure of the condensate system to rise; the methane content in the recovered gas was negatively correlated with the recovery efficiency of gas condensate. The study results are of important significance for guiding the selection of development methods of fractured-vuggy condensate gas reservoirs and the improvement of production effect.

Key words: gas condensate reservoir, dew-point pressure, depletion-drive development, long core, depressurizing rate, fracture-vug location

CLC Number:

TE372

Li Aifen, Fan Xinhao, Gao Zhanwu, Chu Junfeng, Cui Shiti. Experiment on Influencing Factors of Natural Depletion of Fractured-Vuggy Condensate Gas Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(4): 96-100.

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