CO2 Solubility Experiments and Prediction Model

doi:10.7657/XJPG20250313

Abstract

Abstract:

CO₂ solubility is a critical parameter impacting the effects of CO₂ injection for enhanced oil recovery (EOR) in low-permeability/tight reservoirs and CO₂ storage in deep saline aquifers. By using a high-temperature, high-pressure visualized phase reactor, CO₂ dissolution experiments were conducted to investigate the influences of formation temperature/pressure, formation water salinity, and multiphase fluid saturation on solubility of CO₂ in crude oil-formation water systems. A prediction model for CO₂ solubility in crude oil-formation water systems under formation temperature and formation pressure was developed by fitting experimental data. The results show that in crude oil-formation water systems, CO₂ solubility is strongly influenced by pressure and fluid type, and higher pressure and oil saturation can promote CO₂ dissolution. Both formation water salinity and temperature have minor impacts on solubility of CO₂ in formation water. CO₂ dissolution in crude oil exhibits multistage behaviors, and the CO₂ solubility increases significantly with the increase of oil saturation. Moreover, CO₂ solubility declines rapidly with increasing water saturation in oil-water systems and decreases slightly with increasing temperature. The solubility prediction model, derived from the fitting of experimental data, calculates CO₂ solubility in two-phase systems via saturation-weighted contributions of the solubility in oil and water phases and the results show high consistency with the experimental results.

Key words: CO₂ solubility, crude oil-formation water system, formation water salinity, oil saturation, prediction model

CLC Number:

TE341

YANG Hongnan, YUE Ping, FAN Wei, ZHANG Wei, WANG Zhouhua, LI Danchen. CO₂ Solubility Experiments and Prediction Model[J]. Xinjiang Petroleum Geology, 2025, 46(3): 360-366.

Figures/Tables 11

Fig. 1.

Table 1.

Table 2.

Fig. 2.

Fig. 3.

Fig. 4.

Fig. 5.

Table 3.

Parameters for the prediction model of CO2 solubility in formation water"

i	$A i$	$B i$	$C i$
0	1.163 0	0.965 0	1.280 0
1	-16.630 0	-0.272 0	-10.757 0
2	111.073 0	0.092 3	52.696 0
3	-376.859 0	-0.100 8	-222.395 0
4	524.889 0	0.099 8	462.672 0

Table 3.

Fig. 6.

Fig. 7.

Fig. 8.

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碳数	原油物质的量分数/%	碳数	原油物质的量分数/%	碳数	原油物质的量分数/%
C₁	0	C₁₃	3.49	C₂₅	0.71
C₂	0	C₁₄	3.64	C₂₆	0.67
C₃	0.33	C₁₅	3.26	C₂₇	0.63
C₄	3.82	C₁₆	2.60	C₂₈	0.63
C₅	6.46	C₁₇	2.33	C₂₉	0.51
C₆	7.05	C₁₈	2.17	C₃₀	0.54
C₇	10.62	C₁₉	1.90	C₃₁	0.58
C₈	9.90	C₂₀	1.22	C₃₂	0.49
C₉	8.49	C₂₁	1.13	C₃₃	0.36
C₁₀	6.82	C₂₂	0.99	C₃₄	0.28
C₁₁	5.73	C₂₃	0.94	C₃₅	0.44
C₁₂	4.34	C₂₄	0.78	C36⁺	6.04

流体体系	矿化度/ （g·L^-1）	温度/℃	压力/MPa	含水饱和度/%
CO₂- 地层水	0、40、80	70、84、100	5、10、15、20、25、30、35、40、45、50
CO₂-原油		55、70、84、100	10、13、15、20、25、30、35、40、45、50
CO₂-油水两相		70、84	10、13、15、20、25、30、35、40、45、50	30、50、70

CO₂ Solubility Experiments and Prediction Model

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