Numerical Simulation of CO2 Associated Gas Mixing Process

doi:10.11885/j.issn.1674-5086.2021.11.10.01

Abstract

Abstract: In the late stage of CO₂ flooding production in low permeability oil and gas fields, the produced product is associated gas containing a large amount of CO₂. In the further production process, the associated gas from different sources needs to be measured and treated. In order to solve this problem, the geometric model and numerical model of CO₂ gas diffusion flow are established by Fluent software, and then we study the mixing distance of gas diffusion under field conditions, which provides a basis for the installation position of on-line Chromatograph. The results show that CO₂ associated gas from different gas sources is not fully mixed immediately after entering the mixing pipe; obvious mixing occurs after diffusion for a certain distance along the length direction of the pipe with the velocity on both sides gradually decreasing, and the concentration difference decreasing. With the increase of gas flow velocity and pressure, the homogeneous mixing distance of gas diffusion increases with the increase of component B. When the component content is A, B and C, the mass fraction of CO₂ and CH₄ reaches a stable value at about 40, 45 and 30 m. It is recommended to install a gas chromatograph at this position and select a sampling point for measurement.

Key words: CO₂ associated gas, diffusive mixing, CFD, mixing length

CLC Number:

TE81

ZHANG Tao, YANG Ruofan, CHANG Wenjie, CHEN Bin. Numerical Simulation of CO₂ Associated Gas Mixing Process[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(3): 143-153.

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Numerical Simulation of CO₂ Associated Gas Mixing Process

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