CO2封存中盖层突破压力计算与分析

doi:10.13809/j.cnki.cn32-1825/te.2023.03.007

摘要/Abstract

摘要：

盖层是CO₂封存中最重要的地质构造组成，其封闭能力的表征方法是目前研究的热点。针对盖层封闭能力评价的问题，在耦合平行毛管束与DLVO（带电表面通过液体介质的微观作用力）理论的基础上，考虑滑移效应和水膜效应，建立了盖层突破压力的理论计算方法，并与实验数据进行准确度验证。通过影响因素分析研究了突破压力随滑移长度、有效毛管半径的变化规律。结果表明：6块岩心样品的突破压力计算结果与实验数据相对误差介于0.317 %~10.800 %；滑移长度越小、有效毛管半径越大，突破压力越小。

关键词: 盖层, 突破压力, 滑移效应, 水膜, 毛管半径

Abstract:

Cap rock is the most important geological structure in CO₂ storage, and the characterization method of its sealing capacity is a hot research topic at present. Aiming at the problem of evaluating the sealing ability of caprock, based on the theory of coupling parallel capillary bundle and DLVO（microscopic force of charged surface passing through liquid medium）, considering slip effect and water film effect, the theoretical calculation method of caprock breakthrough pressure is established, and the accuracy is verified with experimental data. The variation of breakthrough pressure with slip length and effective capillary radius is studied by analyzing the influencing factors. The results show that the relative error between the calculated breakthrough pressure and the experimental data of six core samples is between 0.317 % and 10.800 %. The smaller the slip length and the larger the effective capillary radius, the smaller the breakthrough pressure.

Key words: cap rock, breakthrough pressure, slip effect, water film, capillary radius

中图分类号:

TE312

崔传智,李惊鸿,吴忠维,张团,张传宝. CO₂封存中盖层突破压力计算与分析[J]. 油气藏评价与开发, 2023, 13(3): 322-329.

CUI Chuanzhi,LI Jinghong,WU Zhongwei,ZHANG Tuan,ZHANG Chuanbao. Calculation and analysis of breakthrough pressure of caprock in CO₂ storage[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(3): 322-329.

图/表 10

图1

图2

表1

水膜厚度计算中使用的参数[24,27]"

参数	符号	数值
玻尔兹曼常数/（J/K）	$k B$	1.38 × 10^-23
电子电荷/C	$e$	1.6 × 10^-19
真空介电常数/（F/m）	$ε 0$	8.854 × 10^-12
水相对介电常数	$ε 3$	78.5
固/水界面电位/mV	$ζ 1$	-80
气/水界面电位/mV	$ζ 2$	-70
伦敦波长/m	$l$	1 × 10^-7
普朗克常数/（J·s）	$f$	6.626 × 10^-34
电子吸收频率/s^-1	$v e$	3 × 10¹⁵
折射率	$n 1, n 2, n 3$	1.45,1.13,1.32
Hamaker常数/J	$A 11, A 22, A 33$	5.86 × 10^-20 5.88 × 10^-21 3.20 × 10^-20
三相体系Hamaker常数/J	$A$	-6.46 × 10^-21
特征长度/m	$δ$	5 × 10^-11

表1

表2

图3

表3

表4

图4

图5

图6

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样品编号	渗透率/10^-3 μm²	孔隙度/%	束缚水饱和度/%	平均毛管半径/nm	水膜厚度/nm
1	0.008	3.62	40.72	42.31	15.60
2	0.470	6.17	48.96	246.86	35.72
3	0.022	8.61	44.41	45.21	14.26
4	0.038	11.24	45.34	52.01	16.59
5	0.026	5.33	39.27	62.47	20.76
6	0.300	8.49	44.19	168.13	33.41
7	0.045	10.21	35.80	59.38	21.62
8	0.073	10.73	33.90	73.77	22.96

编号	岩性	渗透率/μm²	孔隙度/%	突破压力/MPa	实验者
1	砂岩	5.5 × 10^-6	5.5	3.20	AMANN-HILDENBRAND 等^[14]
2	泥岩	1.8 × 10^-3	30.4	0.63	KAWAURA等^[15]
3	页岩	1.0 × 10^-5	8.0	1.25	KIM等^[16]
4	砂岩	1.2 × 10^-5	5.5	1.50	AMANN-HILDENBRAND 等^[14]
5	蒸发岩	2.6 × 10^-8	0.3	5.00	LI等^[17]
6	泥灰岩	2.8 × 10^-6	5.9	4.90	AMANN-HILDENBRAND 等^[14]

编号	润湿角/ （°）	实验压力/ MPa	实验温度/ K	黏度/ （mPa·s）	界面张力/ （mN/m）	实验突破压力/ MPa	计算突破压力/MPa	相对误差/ %
1	44	8.0	323	0.02	32.54	3.20	3.492	9.130
2	49	10.0	313	0.04	28.61	0.63	0.632	0.317
3	49	5.5	298	0.01	40.27	1.25	1.115	10.800
4	44	8.0	323	0.02	32.54	1.50	1.565	4.330
5	27	12.0	332	0.10	26.27	5.00	4.936	1.280
6	50	8.0	323	0.02	32.54	4.90	5.067	1.340

CO₂封存中盖层突破压力计算与分析

Calculation and analysis of breakthrough pressure of caprock in CO₂ storage

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