低渗非均质油藏CO2驱特征及水动力学封窜方法

摘要/Abstract

摘要：

CO₂注入油藏不仅可以大幅度提高原油采收率,且可以实现温室气体减排的目标。因此,CO₂驱技术得到越来越广泛的应用。我国油藏多属于陆相沉积,非均质严重,导致CO₂气窜严重,使CO₂驱油效果变差。利用层内非均质模型,开展了连续注气、水气交替、间歇注气和脉冲注入CO₂开采模拟实验,研究了非均质油藏CO₂驱开采驱特征及动力学环境对CO₂气窜的影响。实验结果表明：水气交替注入驱油效果最好,间歇注气和连续注气效果次之,脉冲注气效果最差;CO₂驱未见气和低气油比阶段采出程度高,是主要的生产阶段,延长两个阶段的生产时间可以提高开发效果;通过改变水动力学条件可以有效地抑制CO₂气窜,水气交替注入抑制气窜能力较强,而脉冲注气的扰动效应加剧了模型中CO₂气窜,上述实验结果表明非均质油藏水气交替注入是CO₂驱最优注入方式。

关键词: CO₂窜流, 非均质油藏, 水动力学方法, 水气交替, 间歇注入, 脉冲注气

Abstract:

CO₂ injection is a commonly used technique for recovering oil from mature reservoirs as it can not only greatly improve oil recovery, but also achieve the goal of greenhouse gas emission reduction. Most of the reservoirs in China are continental deposits, and the serious heterogeneity leads to serious CO₂ gas channeling, which makes the effect of CO₂ flooding worse. In this paper, the simulation experiment of continuous gas injection, WAG, intermittent gas injection and pulse injection of CO₂is carried out by using the heterogeneous model in the layer, and the effects of the characteristics of the CO₂ flooding in the heterogeneous oil reservoir and the dynamic environment on the CO₂ gas blow-by are studied. The experimental results show that WAG injection flooding is the best, the effect of intermittent gas injection and continuous gas injection is second, and the pulse gas injection effect is the worst; CO₂ flooding has no gas and low gas oil. In the production stage, extending the production time of the two stages can improve the development effect; by changing the hydrodynamic conditions, the CO₂ gas channeling can be effectively suppressed, and the WAG injection is more capable of suppressing the gas channeling, and the disturbance effect of the pulse gas injection is intensified. The above experimental results show that WAG injection in heterogeneous reservoirs is the optimal injection mode for CO₂ flooding.

Key words: CO₂ channeling, heterogeneous reservoir, hydrodynamic method, WAG, intermittent injection, pulse gas injection

中图分类号:

TE357

赵清民,伦增珉,赵淑霞. 低渗非均质油藏CO₂驱特征及水动力学封窜方法[J]. 油气藏评价与开发, 2019, 9(3): 62-65.

Zhao Qingmin,Lun Zengmin,Zhao Shuxia. CO₂ flooding characteristics and hydrodynamic suppression channeling method in low permeability heterogeneous reservoirs[J]. Reservoir Evaluation and Development, 2019, 9(3): 62-65.

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层位	渗透率/10^-3μm²	孔隙度,%	厚度/cm
高渗	50.1	16.69	2.2
低渗	10.3	11.74	2.3

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低渗非均质油藏CO₂驱特征及水动力学封窜方法

CO₂ flooding characteristics and hydrodynamic suppression channeling method in low permeability heterogeneous reservoirs

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