多孔介质对注CO2原油相态影响实验及表征

doi:10.13809/j.cnki.cn32-1825/te.2020.03.003

Abstract

Abstract:

In tight reservoirs with low permeability, the effect of porous media on fluid phase behavior can not be ignored. Therefore, the experiments of fluid phase behavior in PVT cylinder and porous media at different conditions of the dissolution gas and the permeability values are established based on full diameter core holder. The results show that the bubble point pressure of crude oil in porous media is lower than that in PVT cylinder. The difference between these two conditions become more evident as the dissolution gas volume becomes lower or the permeability becomes smaller. Based on the above results, the specific value of the diameter of hydrocarbon components and the average diameter of rock pore space is introduced into the function a（T）, modifying the classic SRK EOS equation and proposing the prediction model to calculate the parameters of crude oil in porous media. The simulation results are in good agreement with the experimental data. Furthermore, the EOS and characterized method are modified and established.

Key words: CO₂ and crude oil, phase behavior, porous media, prediction model, modified EOS

CLC Number:

TE357

JIANG Yanbo. Experiment and characterization on phase behavior of CO₂ and crude oil in porous media[J].Reservoir Evaluation and Development, 2020, 10(3): 23-27.

Figures/Tables 10

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References 24

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泡点压力/ MPa	溶解气量/（m³·m^-3）	体积系数	原油密度/ （g·cm^-3）	原油黏度/（mPa·s）
18.00	95.81	1.33	0.723 5	1.729 4
16.50	73.46	1.25	0.760 2	1.756 5
12.37	52.71	1.22	0.770 1	1.884 4
10.84	33.65	1.17	0.791 6	2.153 8
8.50	18.78	1.14	0.807 1	2.464 9

岩心编号	渗透率/10^-3μm²	长度/mm	直径/mm	孔隙体积/mL
1	0.5	51.18	99.70	48.457
2	1.0	49.96	100.46	61.240
3	3.4	63.00	98.94	61.899

组份	分子量	相对密度	临界温度/K	临界压力/MPa	偏心因子	临界偏差因子	摩尔组成
CO₂	44.01	0.300 0	304.20	7.280	0.225 0	0.274 0	0.342 0
C₁	16.04	0.300 0	190.60	4.540	0.008 0	0.288 0	0.082 4
C₂	30.07	0.350 0	305.40	4.820	0.098 0	0.285 0	0.037 0
C₃	44.10	0.350 0	369.80	4.190	0.152 0	0.281 0	0.044 5
iC₄	58.12	0.350 0	408.10	3.600	0.176 0	0.283 0	0.008 7
nC₄	58.12	0.350 0	425.20	3.750	0.193 0	0.274 0	0.014 9
iC₅	72.15	0.400 0	460.40	3.340	0.227 0	0.271 0	0.009 0
nC₅	72.15	0.400 0	469.60	3.330	0.251 0	0.262 0	0.005 0
C₆	84.00	0.685 0	512.00	3.297	0.296 0	0.260 0	0.019 0
CN₊₁	141.97	0.797 7	628.91	2.592	0.431 1	0.256 5	0.251 6
CN₊₂	277.82	0.864 3	779.18	1.456	0.807 4	0.226 4	0.127 4
CN₊₃	491.28	0.926 2	929.36	0.790	1.256 1	0.190 5	0.058 5
总计							1.000 0

饱和原油样品	K/10^-3μm²	T/K	泡点- 实验值/MPa	泡点- 模拟值/MPa	误差/ %
HH（饱和CO₂）	3.4	338.15	17.16	17.31	0.87
HH（饱和CO₂）	1.0	338.15	16.87	16.91	0.24
HH（饱和CO₂）	0.5	338.15	16.55	16.69	0.85

Experiment and characterization on phase behavior of CO₂ and crude oil in porous media

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Experiment and characterization on phase behavior of CO2 and crude oil in porous media

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Experiment and characterization on phase behavior of CO₂ and crude oil in porous media