Special Oil & Gas Reservoirs >

2022 , Vol. 29 >Issue 1: 91 - 98

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.01.014

Reservoir Engineering

Experiment on the Effect of Water Saturation of Filling Medium on the Dissolution and Diffusion of CO2 and N2 in Fractured-Vuggy Reservoir

  • Wang Zhixing ,
  • Hou Jirui ,
  • Yang Yuhao ,
  • Zhu Guiliang
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  • 1. Chongqing University of Science and Technology, Chongqing 401331, China;
    2. China University of Petroleum (Beijing), Beijing 102249, China;
    3. MOE Key Laboratory of Petroleum Engineering, Beijing 102249, China;
    4. The University of Kansas, Lawrence KS66045, USA;
    5. SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China

Received date: 2020-11-23

  Revised date: 2021-10-10

  Online published: 2023-01-10

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Abstract

In order to gain a deeper understanding of the mechanism of the effect of CO2 and N2 injection in fractured-vuggy reservoirs on the residual oil in the filling medium inside the fractures and pores, pressure depletion experiment was conducted to determine the gas diffusion coefficient and solubility, for the purpose of studying the effect of water saturation on the diffusion pressure, solubility and diffusion coefficient of the two injected gases and analyzing the mechanism of the effect of water saturation of the filling medium on the dissolution and diffusion of CO2 and N2 under real reservoir conditions. The experimental results indicated that the water inside the filling medium was increased from being bound water to being fully saturated, the pressure drop of CO2 and N2 was 41.62% and 43.22% and the solubility drop was 40.16% and 42.50% respectively, and the diffusion coefficients were both reduced by an order of magnitude; the existence of formation water in the filling medium reduces the dissolution, diffusion and mass transfer capacities of the injected gas; the physical properties of the formation fluid and the difference between the formation fluid and the porous medium were the main influencing factors. This study provides a reference for the gas injection development of residual oil in fractured-vuggy reservoir in high water-cut stage and the optimization of relevant parameters.

Key words： fracture-cavity reservoir; filling medium; water saturation; gas dissolution and diffusion; CO2; N2

Cite this article

Wang Zhixing , Hou Jirui , Yang Yuhao , Zhu Guiliang . Experiment on the Effect of Water Saturation of Filling Medium on the Dissolution and Diffusion of CO2 and N2 in Fractured-Vuggy Reservoir[J]. Special Oil & Gas Reservoirs, 2022 , 29(1) : 91 -98 . DOI: 10.3969/j.issn.1006-6535.2022.01.014

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