An Experimental Study on Mixed Gas of Depleted Gas Reservoir Type Gas Storage with CO2 as Cushion Gas

doi:10.11885/j.issn.1674-5086.2024.05.24.01

Abstract

Abstract: When used as the cushion gas of underground gas storage, CO₂ can maintain the stability of pressure inside the gas storage, prevent working gas from escaping from the bottom edge, prevent edge and bottom water from invading, and provide power for gas production. However, the injected CO₂ will mix with natural gas, and the strong injection and production in the gas reservoir may cause the fluctuation of CO₂ and CH₄ mixing zone, thus affecting the purity of produced gas. In this paper, mixed gas experiment of sand filling vessel and multiple injection and production experiment of CH₄ and CO₂ were carried out to study the mixed gas characteristics of CO₂ and natural gas as well as the influence of different working cycle and working system on the mixed zone. The numerical simulation results were tested with laboratory experiment results. The experimental results show that under the same production system, with the increase of injection-production cycle, the mole fraction of CO₂ in the sampling gas also increases gradually at very small scale and the mixing zone moves up slowly. The mole fraction of CO₂ in the sample gas decreases with the increase of the gas production rate. The gas production rate will have an impact on the development of the mixing zone, but the impact is not significant.

Key words: cushion gas, gas mixture, mixed zone, multiple injection and production experiment, gas velocity

CLC Number:

HU Shuyong, YANG Xiaochen, DENG Yi, ZHENG Xingming. An Experimental Study on Mixed Gas of Depleted Gas Reservoir Type Gas Storage with CO₂ as Cushion Gas[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(2): 90-97.

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An Experimental Study on Mixed Gas of Depleted Gas Reservoir Type Gas Storage with CO₂ as Cushion Gas

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