枯竭气藏CO2封存中的相平衡规律研究

doi:10.13809/j.cnki.cn32-1825/te.2023.03.002

Abstract

Abstract:

In the process of CO₂ injection and storage of a single well in depleted gas reservoirs, the injected CO₂ causes the rebalance among gas, water and solid, and the accompanying CO₂ dissolution, water evaporation and salting out affect the physical properties of the formation near this well. Therefore, taking depleted gas reservoir in western Sichuan as an example, the SRK-HV equation and salting out model are used to analyze the three-phase change rule during the CO₂ injection process of the depleted gas reservoir. The researches show that during the CO₂ injection process in the constant volume system, with the increase of the number of mole of CO₂, the gas phase pressure increases, the CO₂ solubility gradually increases, and the mole fraction of H₂O in the gas phase gradually decreases, but the total number of mole of H₂O in the gas phase continuously increases, indicating that the total evaporation of water increases. In addition, the water phase volume reduction caused by water evaporation is smaller than the initial water phase volume, so the increase of formation water salinity is small. The dissolution of CO₂ accelerates the precipitation of CaCO₃, while inhibiting the precipitation of CaSO₄ and CaSO₄·2H₂O. In calcium chloride type formation water, CaCO₃ and CaSO₄ will be separated with the increase of salinity. The research results has certain reference significance for the study of water evaporation and salting out during CO₂ injection in depleted gas reservoirs.

Key words: depleted gas reservoir, CO₂ storage, phase equilibrium, formation water evaporation, salting out

CLC Number:

TE135

YANG Yu,XU Qilin,LIU Ronghe,HUANG Dongjie,YAN Ping,WANG Jianmeng. Phase equilibrium law of CO₂ storage in depleted gas reservoirs[J].Petroleum Reservoir Evaluation and Development, 2023, 13(3): 280-287.

Figures/Tables 10

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组分	临界温度/ ℃	临界压力/ MPa	偏心因子	摩尔质量/ （g/mol）
CH₄	-82.40	4.5	0.008	16.04
H₂O	374.15	21.8	0.344	18.01

CO₂/mol	CH₄/mol	H₂O/mol	体系压力/MPa
0（初始条件）	13.5	86.5	6.0
30	13.5	86.5	14.2
60	13.5	86.5	23.5
90	13.5	86.5	33.8
120	13.5	86.5	42.9
150	13.5	86.5	53.1

Phase equilibrium law of CO₂ storage in depleted gas reservoirs

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Phase equilibrium law of CO2 storage in depleted gas reservoirs

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Phase equilibrium law of CO₂ storage in depleted gas reservoirs