超临界CO2萃取致密油的数值模拟研究

Abstract

Abstract:

The huff and puff operation by CO₂ extraction can overcome the production and development problems of tight reservoirs which are difficult to form effective displacement. Crude oil fractions were divided by PVTi module, and the pseudo-component properties of formation crude oil could be obtained by combining with the expansion experimental data of CO₂ injection. Relevant factors affecting the extraction of tight oil by CO₂ were studied by CFD simulation. The results showed that supercritical CO₂ mainly extracted the light components of crude oil in porous media, especially those below C₁₅₊. The higher injection pressure was, and the more CO₂ was injected, the stronger the solubility of crude oil would be, and it could enhance the extraction of heavy components. Meanwhile, the increase of CO₂ injection could also promote the retention of CO₂ in porous media, which was conducive to CO₂ storage. With the increase of porosity, the extraction effect of CO₂ increased first and then decreased, and was still 44 % under the condition of lower porosity. The extraction of tight oil by CO₂ has a certain application prospect.

Key words: tight oil, CO₂, extraction, porous media, numerical simulation

CLC Number:

TE348

Shi Leiting,Zhu Shijie,Ma Jie,Yang Mei,Peng Yangping,Ye Zhongbin. Numerical simulation of tight oil extraction with supercritical CO₂[J].Reservoir Evaluation and Development, 2019, 9(3): 25-31.

Figures/Tables 13

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References 16

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原油性质变化	物理变化	其他
降低原油黏度	原油体积膨胀	溶解气驱作用
改善原油与水的流度比	轻组分萃取、萃取作用	混相效应
降低油水间界面张力	分子扩散作用	提高地层渗透率

组分	摩尔组成/（mol%）	质量分数,%
C₅₊	30.264	5.128 1
C₁₀₊	14.222	5.455 3
C₁₅₊	9.850	6.045 9
C₂₀₊	14.488	11.601 0
C₂₅₊	17.432	24.599 0
C₃₀₊	13.744	47.170 7

组分	分子量	临界压力/MPa	临界温度/K	方程系数Ω_a	方程系数Ω_b	偏心因子	等张比容
CO₂	44.01	7.39	304.70	0.43	0.09	0.23	78.00
C₅₊	16.04	4.60	190.60	0.43	0.09	0.01	77.00
C₁₀₊	36.32	4.60	334.13	0.43	0.09	0.12	126.86
C₁₅₊	58.12	3.73	417.46	0.43	0.09	0.19	186.10
C₂₀₊	75.82	3.27	478.13	0.43	0.09	0.26	241.47
C₂₅₊	133.63	2.54	616.64	0.43	0.09	0.43	389.78
C₃₀₊	325.00	1.04	839.84	0.43	0.09	1.04	828.33

模拟编号	实验条件
模拟编号	温度/ ℃	压力/ MPa	孔隙度, %	渗透率/ 10^-3μm²	CO₂注入量, %
1	72	9.85	10	0.95	10
2	72	12.00	10	0.95	20
3	72	20.80	10	0.95	40
4	72	20.80	15	2.23	40
5	72	20.80	20	3.03	40
6	72	20.80	10	0.95	20
7	72	20.80	10	0.95	55
8	72	20.80	10	0.95	70

组分名称	孔隙度为10 %的质量/kg			孔隙度为15 %的质量/kg			孔隙度为20 %的质量/kg
组分名称	初始含量	萃取后含量	萃取量	初始含量	萃取后含量	萃取量	初始含量	萃取后含量	萃取量
C₅₊	0.056 6	0.000 2	0.056 4	0.059 1	0.000 2	0.059 0	0.063 3	0.000 2	0.063 1
C₁₀₊	0.060 1	0.004 3	0.055 8	0.062 8	0.004 4	0.058 5	0.067 2	0.004 5	0.062 7
C₁₅₊	0.066 7	0.010 9	0.055 8	0.069 8	0.011 0	0.058 8	0.074 6	0.011 4	0.063 2
C₂₀₊	0.128 0	0.080 4	0.047 6	0.133 7	0.080 8	0.052 9	0.143 1	0.083 7	0.059 4
C₂₅₊	0.271 4	0.234 9	0.036 5	0.283 6	0.236 2	0.047 4	0.303 4	0.244 5	0.058 8
C₃₀₊	0.520 3	0.492 2	0.028 1	0.543 9	0.495 0	0.048 8	0.581 7	0.512 5	0.069 2
CO₂	0.000 0	0.044 1		0.000 0	0.044 4		0.000 0	0.045 9
总质量	1.103 1	0.867 0		1.153	0.872		1.233 2	0.902 7

Numerical simulation of tight oil extraction with supercritical CO₂

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模拟条件	萃取后总质量/kg	初始原油质量/kg	萃取率, %	CO₂滞留量/kg
压力9.85 MPa	0.965 6	1.103 1	18.14	0.029 5
压力12.00 MPa	0.953 7	1.103 1	23.91	0.051 1
压力20.80 MPa	0.867 0	1.103 1	44.68	0.041 1
孔隙度10 %	0.867 0	1.103 1	44.68	0.041 1
孔隙度15 %	0.872 0	1.153 0	53.37	0.044 4
孔隙度20 %	0.902 7	1.233 2	51.43	0.045 9
CO₂注入量20 %	0.908 6	1.103 1	32.92	0.027 4
CO₂注入量55 %	1.015 8	1.103 1	45.15	0.156 7
CO₂注入量70 %	1.160 5	1.103 1	46.54	0.286 8

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Numerical simulation of tight oil extraction with supercritical CO2

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Numerical simulation of tight oil extraction with supercritical CO₂