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

摘要/Abstract

摘要：

低渗致密油藏中,多孔介质对原油流体相态影响不可忽略。针对致密油藏CO₂驱过程中多孔介质对原油流体相态的影响问题,建立了基于全直径岩心夹持器的多孔介质中流体相态实验方法,开展了不同溶解气量、不同渗透率条件下PVT筒及多孔介质中流体相态实验。研究结果表明,多孔介质中原油泡点压力要低于PVT筒中实测值,且随着CO₂溶解气量或渗透率的减小,泡点压力降低幅度增大。基于室内实验结果,将原油中烃类组分分子直径与储层岩心平均孔道直径比例引入到a（T）函数中,对SRK状态方程进行修正,建立了一种多孔介质中流体相态参数预测方法,模拟结果与实验值吻合较好,修正并建立了多孔介质中流体状态方程及相态表征方法。

关键词: CO₂原油体系, 相态, 多孔介质, 预测模型, 修正状态方程

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

中图分类号:

TE357

姜颜波. 多孔介质对注CO₂原油相态影响实验及表征[J]. 油气藏评价与开发, 2020, 10(3): 23-27.

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.

图/表 10

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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

多孔介质对注CO₂原油相态影响实验及表征

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

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