稠油油藏CO2辅助蒸汽驱油机理实验研究

doi:10.13809/j.cnki.cn32-1825/te.2021.06.008

Abstract

Abstract:

In order to further clarify the mechanism of steam flooding assisted by CO₂ in the heavy oil reservoir, its visualization experiments are carried out by the acrylic plate model and natural cores, and their synergy is analyzed. After the mechanism of synergistic displacement is clarified, the core flow experiments are carried out to further analyze the influence of the synergistic effect and the injection mode on the actual displacement efficiency. The results show that CO₂ assisted steam flooding has the effects of the synergistic viscosity reduction, the expansion of steam sweep efficiency, the availability of residual oil at the blind end, and the demulsification. Among them, the comprehensive viscosity reduction rate of the crude oil is 59.8 %, and the steam sweep area is increased by 37.44 %. Compared to the flooding by steam alone, after the assitant of CO₂, the recovery rate increased significantly. The alternate injection of steam and CO₂ can get a recovery rate of 65.7 %, 7.9 % more than that of mixed injection, and observe the stable foam oil flow at the outlet.

Key words: heavy oil reservoir, steam flooding, CO₂ assisted steam flooding, visualization, foam oil flow

CLC Number:

TE357

Junheng WANG,Jian WANG,Zhiwei ZHOU, et al. Experimental study on mechanism of CO₂ assisted steam flooding in heavy oil reservoir[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(6): 852-857.

Figures/Tables 12

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References 24

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碳组分含量（%）
C₅—C₁₁	C₁₂—C₁₈	C₁₉—C₃₀	C₃₁—C₃₅	C₃₅₊
1.986	17.624	66.307	6.221	7.862

离子组成						总矿化度
K⁺+Na⁺	Ca²⁺	Mg²⁺	Cl^-	HCO₃^-	SO₄^2-	总矿化度
1 798.6	4.01	3.65	2 056.27	1 208.20	43.23	4 509.86

岩心编号	岩心长度（cm）	岩心直径（cm）	渗透率（10^-3μm²）	孔隙度（%）	含油饱和度（%）
1	11.64	3.80	2 213.9	27.9	68.8
2	11.96	3.80	2 436.0	27.3	69.2
3	12.36	3.80	2 563.1	28.6	71.3

岩心编号	注入方式	出油量（mL）	采收率（%）	原油形态变化
1	注纯蒸汽	7.2	28.3	出现部分乳化油
2	混合注入	14.8	57.8	无明显变化
3	交替注入	18.8	65.7	出现泡沫油现象

Experimental study on mechanism of CO₂ assisted steam flooding in heavy oil reservoir

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Experimental study on mechanism of CO2 assisted steam flooding in heavy oil reservoir

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Experimental study on mechanism of CO₂ assisted steam flooding in heavy oil reservoir