使用水力屏障控制单一倾斜储层中CO<sub>2</sub>羽的迁移

赵锐锐; 成建梅

doi:10.3799/dqkx.2016.056

使用水力屏障控制单一倾斜储层中CO₂羽的迁移

doi: 10.3799/dqkx.2016.056

赵锐锐,
成建梅^,

中国地质大学环境学院，湖北武汉 430074

基金项目:

国家自然科学基金项目 41402212

中央高校基本科研业务费专项资金资助项目 CUGL140814

国家自然科学基金项目 1172217

详细信息

作者简介:
赵锐锐(1984-)，男，讲师，主要从事CO₂地质封存和地下水数值模拟技术方面的研究工作.E-mail: rr.zhao@cug.edu.cn

通讯作者:
成建梅，E-mail: jmcheng@cug.edu.cn

中图分类号: P641
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出版历程
- 收稿日期: 2015-09-08
- 刊出日期: 2016-04-15

Using Hydraulic Barrier Control CO₂ Plume Migration in Sloping Reservoir

Zhao Ruirui,
Cheng Jianmei^,

School of Environmental Studies, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 摘要：在单一倾斜含水层中封存CO₂时，在浮力作用下，CO₂会向地层上升一侧快速运移，不利于封存安全.可在倾斜地层的上升一侧，距离CO₂注入井一定位置设置注水井，创造水力屏障，以阻止CO₂向上移动.建立了数值模型来探讨这一方法的有效性，分析注水位置、距离、速度等因素的影响.结果表明注水形成的水力屏障能有效阻挡CO₂羽的向上迁移，且能促进CO₂溶解，抽水能显著降低地层压力.为了确保能完全阻挡CO₂运移，需要注水长度大于CO₂羽的厚度，甚至是在全部储层注水.注水速度是影响水力屏障效果的关键因素.注水距离越近阻挡效果越好.可以在CO₂羽即将到达之前注水，以减少注水量和能源消耗.
- 深部含水层 /
- CO₂地质封存 /
- 注水 /
- 抽水 /
- 地层压力 /
- 地下水 /
- 环境地质
Abstract: CO₂ will rapidly migrate toward the up-tilt direction of the formation under buoyancy when CO₂ is stored in the sloping aquifers. This phenomenon is not conducive to the storage security. In this paper, we are proposed setting water injection wells at a certain distance from the CO₂ injection well in the up-tilt direction of the formation. Then hydraulic barrier is created to retard upward CO₂ migration. The numerical model is set up to investigate the effectiveness of this approach, and to analyze the effects of some factors, for instance, the injection position, the injection distance and the injection rate. The results show that the hydraulic barrier caused by injecting water can effectively retard upward CO₂ migration and enhance CO₂ dissolution. Pumping water can significantly reduce the formation pressure. To ensure that CO₂ is completely retarded, the length of the injection water needs to be greater than the thickness of the CO₂ plume, even injecting water through all thickness of the formation. The rate of the injection water is the key factor affecting the effectiveness of the hydraulic barrier. The effectiveness is better when the injection water well is closer to the CO₂ injection well. The water can be injected just before the arrival of CO₂ plume to reduce the amount of injected water and energy consumption.
- deep aquifer /
- CO₂ geological storage /
- injecting water /
- pumping water /
- formation pressure /
- groundwater /
- environmental geology

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图 1 模型三维视图

Fig. 1. The three-dimensional view of the model

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图 2 模型示意

Fig. 2. The sketch of the model

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图 3 Base case中A-A′剖面CO₂饱和度和溶解的质量分数在不同时间的分布情况

剖面位置见图 1；S_g代表CO₂饱和度；X_CO₂代表CO₂溶解的质量分数

Fig. 3. The distribution of CO₂ gas saturation and dissolved CO₂ mass fraction along the A-A′ cross section at different times for the Base case

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图 4 Case 1a和Case 1c中A-A′剖面CO₂饱和度在不同时间的分布情况

剖面位置见图 1；S_g代表CO₂饱和度

Fig. 4. The distribution of CO₂ gas saturation along the A-A′ cross section at different times for the Cases 1a and 1c

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图 5 Case 2a和Case 2b中A-A′剖面CO₂饱和度在50 a时的分布情况

剖面位置见图 1；S_g代表CO₂饱和度

Fig. 5. The distribution of CO₂ gas saturation along the A-A′ cross section at 50 years for the Cases 2a and 2b

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图 6 Case 3a和Case 3c中A-A′剖面CO₂饱和度在不同时间的分布情况

剖面位置见图 1；S_g代表CO₂饱和度

Fig. 6. The distribution of CO₂ gas saturation along the A-A′ cross section at different times for the Cases 3a and 3c

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图 7 Case 4a和Case 4b中A-A′剖面CO₂饱和度在100年时的分布情况

剖面位置见图 1；S_g代表CO₂饱和度；X_CO₂代表CO₂溶解的质量分数

Fig. 7. The distribution of CO₂ gas saturation along the A-A′ cross section at 100 years for the Cases 4a and 4b

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图 8 不同抽水速度下监测点的压力提升情况

Fig. 8. The pressure buildup of the monitoring point at different injection rates

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表 1 模型主要参数取值

Table 1. The values of main model parameters

地层	K_h (10^-15 m²)	K_h/K_v	α^-1(MPa)	β(10^-10 Pa^-1)	S_rw	S_rg	m
盖层	0.001	10	5.00	4.5	0.40	0.15	0.457
储层	100	10	0.02	4.5	0.30	0.15	0.457
注：K_h为水平渗透率；K_h/K_v为水平和垂直渗透率的比值；α^-1为毛细进入压力；β为压缩率；S_rw为最大残余水饱和度；S_rg为最大残余气饱和度；m为相对渗透率函数中的指数.

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表 2 不同注水方案中的参数设置

Table 2. The parameter values used in the different injection scenarios

方案编号	注水位置	注水距离(km)	注水速度(kg/s)	停止注入CO₂后注水速度(kg/s)	抽水速度(kg/s)
Base case	全部储层	1	31.7	10	31.7
Case 1a	储层上部100 m
Case 1b	储层上部40 m
Case 1c	储层上部20 m
Case 2a		2
Case 2b		3
Case 2c		5
Case 3a			10.0
Case 3b			5.0
Case 3c			1.0
Case 4a				5
Case 4b				1
Case 5a					10.0
Case 5b					5.0
Case 5c					0(不抽水)
注：空白处与Base case设置相同.

下载: 导出CSV

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