驱油用CO2泡沫体系粒径对其性能影响研究

doi:10.13809/j.cnki.cn32-1825/te.2020.03.005

Abstract

Abstract:

CO₂ is widely used as a displacement agent in oil displacement because of its unique physical properties and its chemical reaction with crude oil. But pure CO₂ gas flooding is prone to gas channeling. So the application of CO₂ in the foam flooding process make CO₂ can not only play its own role in oil displacement, but also realize fluidity control and reduce the possibility of gas channeling. In this study, the stability, particle size change and percolation characteristics of CO₂ foam with different particle sizes and the same chemical composition are experimentally studied, the change rule of the influence of particle size on foam performance is obtained, and the influence mode is analyzed and discussed. The results show that the smaller the bubble size, the better the stability of the foam system, the stronger the blocking ability, and the slower the particle size changes over time. Changing the preparation method to reduce the particle size of the foam system can effectively improve the foam’s stability and EOR capacity.

Key words: CO₂ foam, oil displacement, particle size, stability, percolation

CLC Number:

TE355

Shuangxing LIU,Bo PENG,Qi LIU, et al. Study on impact of particle size of CO₂ foam system for flooding on its performance[J]. Reservoir Evaluation and Development, 2020, 10(3): 33-38.

Figures/Tables 13

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References 28

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名称	纯度	类型	基本性能
十六烷基三甲基溴化铵（CTAB）	99 %	阳离子型	25 ℃临界胶束浓度为343 mg/L
十二烷基硫酸钠（SDS）	96 %	阴离子型	25 ℃临界胶束浓度为2 307 mg/L
聚山梨酯80 （Tween80）	40 %	聚合物	25 ℃、1 g/L条件下黏度为493 mPa·s
黄原胶（ XC）	USP级	聚合物	25 ℃、1 g/L条件下黏度为9 472 mPa·s

名称	纯度	类型
氯化钠（NaCl）	分析纯	无机盐
氯化钾（KCl）	分析纯	无机盐
二水氯化钙（CaCl₂·2H₂O）	分析纯	无机盐
六水氯化镁（MgCl₂·6H₂O）	分析纯	无机盐
碳酸钠（Na₂CO₃）	分析纯	无机盐
硫酸钠（Na₂SO₄）	分析纯	无机盐
碳酸氢钠（NaHCO₃）	分析纯	无机盐

离子种类	浓度/（mg·L^-1）	离子种类	浓度/（mg·L^-1）
Na⁺+K⁺	4 459	SO₄^2-	539
Ca²⁺	356	Cl^-	2 989
Mg²⁺	116	CO₃^2-	437
HCO₃^-	966

编号	水测渗透率/10^-3 μm²	孔隙度/%	筛板目数
1	109	23.5	50
2	111	23.2	140
3	110	23.7	325
4	1. 2	25.7	50
5	1	25.9	240
6	1	26.1	325

筛板目数	t_1/2/min	t_D/s	d/μm
400	281	216	0.276±0. 069
325	269	215	0.282±0. 077
200	254	203	0.289±0. 085
140	231	178	0.572±0. 133
80	202	163	1.698±0. 452
50	188	147	3.533±0. 701

Study on impact of particle size of CO₂ foam system for flooding on its performance

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Study on impact of particle size of CO2 foam system for flooding on its performance

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Study on impact of particle size of CO₂ foam system for flooding on its performance