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

摘要/Abstract

摘要：

在枯竭气藏CO₂注入及封存过程中，注入的CO₂引起气、水、固三相之间的再平衡，伴随出现CO₂溶解、水蒸发和盐析现象，影响近井带地层物性。以川西的枯竭气藏为例，采用SRK-HV方程和盐析模型分析了枯竭气藏CO₂注入过程中的三相变化规律。研究表明：在定容体系中的CO₂注入过程中，随着CO₂物质的量增加，气相压力增大，CO₂溶解度逐渐增大，H₂O在气相中的摩尔分数逐渐降低，但H₂O在气相中的物质的量不断增加，说明水的总蒸发量加大。此外，水蒸发引起的水相体积减小量相对于初始水相体积较小。因此，地层水矿化度增加幅度较小。CO₂的溶解加快了CaCO₃的析出，同时抑制了CaSO₄、CaSO₄·2H₂O的析出。在氯化钙型地层水中，随着矿化度增加，地层水中会析出CaCO₃和CaSO₄两种盐成分。该研究成果对枯竭气藏CO₂注入过程中水蒸发及盐析规律研究具有一定的借鉴意义。

关键词: 枯竭气藏, CO₂封存, 相平衡, 地层水蒸发, 盐析

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

中图分类号:

TE135

杨宇,徐启林,刘荣和等. 枯竭气藏CO₂封存中的相平衡规律研究[J]. 油气藏评价与开发, 2023, 13(3): 280-287.

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

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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

枯竭气藏CO₂封存中的相平衡规律研究

Phase equilibrium law of CO₂ storage in depleted gas reservoirs

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