Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 6: 114 - 119

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.06.015

Reservoir Engineering

Experiment on Replacement of High Carbon Gas with High Hydrocarbon Gas and Its Mechanism Evaluation

  • Cui Shuheng ,
  • Kong Jie ,
  • Lu Ruibin ,
  • Guo Minling ,
  • Wang Yujun ,
  • Zhong Hongpeng
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  • 1. Zhanjiang Engineering and Technology Branch, CNOOC Energy Development Co., Ltd., Zhanjiang, Guangdong 524057, China;
    2. Guangdong Provincial Key Laboratory of Offshore High Temperature and High Pressure Oil and Gas Reservoir Exploration and Development Enterprise, Zhanjiang, Guangdong 524057, China;
    3. CNOOC (China) Zhanjiang Company, Zhanjiang, Guangdong 524057, China

Received date: 2022-11-30

  Revised date: 2023-09-05

  Online published: 2024-01-19

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Abstract

The deep gas group of a certain gas field in the western part of South China Sea is a high-carbon gas reservoir, and the shallow gas group is a high-hydrocarbon gas reservoir. In order to effectively improve the recovery rate of high-hydrocarbon gas reservoirs and increase the economic benefits, the indoor experiments of replacing high-hydrocarbon gas with high-carbon gas were carried out, and the mechanism evaluation method was adopted, to obtain the changes of gas components and solubility after the replacement of high-hydrocarbon gas with high-carbon gas, as well as the effect of the high-hydrocarbon reservoirs on the recovery rate after the replacement and the influencing factors, and the study results were applied to the evaluation of the mine pilot experiments and the prediction of the effect of CO2 storage in high-carbon gas reservoirs of a certain gas field in western part of South China Sea. The results show that after the replacement of the high-hydrocarbon gas with the high-carbon gas, the high-carbon gas can displace the high-hydrocarbon gas in formation irreducible water, free CH4 increases, and the long core replacement was carried out under reservoir conditions such as low-injection and high-production, large dip and high permeability of the core, with a higher cumulative CH4 recovery degree of up to 4.5%. This study provides theoretical references for the efficient development of high-hydrocarbon gas reservoirs in China , and the evaluation of CO2 storage mode in high-carbon gas reservoirs.

Key words： high-hydrocarbon gas reservoirs; high-hydrocarbon gas enhanced recovery; solubility; replacement mechanism; gas field in the western part of South China Sea

Cite this article

Cui Shuheng , Kong Jie , Lu Ruibin , Guo Minling , Wang Yujun , Zhong Hongpeng . Experiment on Replacement of High Carbon Gas with High Hydrocarbon Gas and Its Mechanism Evaluation[J]. Special Oil & Gas Reservoirs, 2023 , 30(6) : 114 -119 . DOI: 10.3969/j.issn.1006-6535.2023.06.015

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