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

摘要/Abstract

摘要：

CO₂由于其独特的物理性质和其与原油之间的理化反应,被广泛用作驱替剂应用于原油开采过程中。但纯气体驱油易发生气窜现象,将CO₂用于泡沫驱过程,既能发挥CO₂气体本身的驱油作用,又能够实现流度控制,减少气窜现象发生的可能性。对粒径不同、化学组成相同的CO₂泡沫体系的稳定性、粒径变化、渗流特征等进行了实验研究,得到了粒径对泡沫性能影响的变化规律,并对影响方式进行了分析与讨论。结果显示,气泡粒径越小,泡沫体系的稳定性越好、封堵能力越强,且粒径随时间变化越缓慢。通过改变制备工艺,减小泡沫体系的粒径,有利于驱油用泡沫体系稳定性和原油驱替能力的提升。

关键词: CO₂泡沫, 原油驱替, 粒径, 稳定性, 渗流

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

中图分类号:

TE355

刘双星,彭勃,刘琦,李兴春,薛明. 驱油用CO₂泡沫体系粒径对其性能影响研究[J]. 油气藏评价与开发, 2020, 10(3): 33-38.

LIU Shuangxing,PENG Bo,LIU Qi,LI Xingchun,XUE Ming. 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.

图/表 13

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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

驱油用CO₂泡沫体系粒径对其性能影响研究

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

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