长焰煤气水相渗特征实验研究

陈功辉; 唐明云; 甯江琪; 张海路

doi:10.13272/j.issn.1671-251x.2023070022

长焰煤气水相渗特征实验研究

doi: 10.13272/j.issn.1671-251x.2023070022

陈功辉^{1, 2,},
唐明云^{1, 2, ,},
甯江琪^{1, 2},
张海路^{1, 2}

1.
安徽理工大学安全科学与工程学院，安徽淮南　232001
2.
安徽理工大学深部煤矿采动响应与灾害防控国家重点实验室，安徽淮南　232001

基金项目: 国家自然科学基金项目（51774014）。

详细信息

作者简介:
陈功辉（1997—），男，安徽六安人，硕士研究生，研究方向为瓦斯及动力灾害防治，E-mail：872949045@qq.com

通讯作者:
唐明云（1978—），男，江西南丰人，教授，博士，博士研究生导师，研究方向为矿井火灾防治理论与技术、煤岩瓦斯热−流−固耦合，E-mail：mytang@aust.edu.cn。

中图分类号: TD713
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出版历程
- 收稿日期: 2023-07-07
- 修回日期: 2024-01-19
- 网络出版日期: 2024-01-31

Experimental study on the permeability features of long flame gas water phase

CHEN Gonghui^{1, 2
,},
TANG Mingyun^{1, 2
, ,},
NING Jiangqi^{1, 2},
ZHANG Hailu^{1, 2}

1.
College of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
2.
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China

摘要

摘要: 长焰煤内部蕴藏大量煤层气，随着开采深度的不断增加，需要对煤储层中煤层气与地下水之间的复杂渗流特性进行探索，以降低煤层气开采难度、提高煤层气开采效率。以内蒙古鄂尔多斯准格尔旗魏家峁矿区长焰煤为实验对象，采用TCXS−Ⅱ型煤岩气水相对渗透率测定仪进行长焰煤气水相渗实验，利用非稳态法得到不同有效应力、孔隙压力和温度作用下长焰煤在气驱水过程中的气水相渗特征，结果表明：① 当有效应力由3.7 MPa增大至7.7 MPa时，气相相对渗透率上升幅度减小，而水相相对渗透率下降幅度略有增加；有效应力的增大会对流体的渗透能力产生抑制作用，且对水相渗流的抑制作用大于气相渗流；残余水饱和度随着有效应力的增大而增大。② 当孔隙压力由2 MPa增大至6 MPa时，水相相对渗透率曲线下降幅度变缓，气相相对渗透率曲线上升幅度更加明显，气水共渗范围变宽，等渗点饱和度增大，残余水饱和度减小。③ 当温度由20 ℃升高至80 ℃时，气相相对渗透率增长幅度及水相相对渗透率下降幅度均逐渐变大，气水共渗范围变宽，残余水饱和度呈下降趋势，气相渗流量呈增长趋势。该研究结果可为长焰煤储层水力压裂和注热开采等煤层气开采技术研究提供理论依据和实验参考。
- 长焰煤 /
- 气水相渗 /
- 相对渗透率 /
- 有效应力 /
- 孔隙压力 /
- 温度 /
- 残余水饱和度
Abstract: There is a large amount of CBM in the long flame coal. With the continuous increase of mining depth, it is necessary to explore the complex permeability features between CBM and groundwater in the coal reservoir to reduce the difficulty of CBM mining and improve the efficiency of CBM mining. Taking the long flame coal in the Weijiamao mining area of Zhungeer Banner, Ordos, Inner Mongolia as the experimental object, the TCXS-II coal rock gas water relative permeability tester is used to conduct the long flame gas water phase permeability experiment. The non steady state method is used to obtain the gas water phase permeability features of long flame coal under different effective stresses, pore pressures, and temperatures during the gas water drive process. The results show the following points. ① When the effective stress increases from 3.7 MPa to 7.7 MPa, the increase in gas phase relative permeability decreases, while the decrease in water phase relative permeability slightly increases. The increase of effective stress will have an inhibitory effect on the permeability of the fluid, and the inhibitory effect on water phase seepage is greater than that on gas phase seepage. The residual water saturation increases with the increase of effective stress. ② When the pore pressure increases from 2 MPa to 6 MPa, the decrease in the relative permeability curve of the water phase slows down, and the increase in the relative permeability curve of the gas phase becomes more obvious. The range of gas water co-permeation becomes wider, the saturation of the isotonic point increases, and the residual water saturation decreases. ③ When the temperature rises from 20 ℃ to 80 ℃, the increase in gas phase relative permeability and the decrease in water phase relative permeability gradually increase. The range of gas water co-permeation becomes wider, the residual water saturation shows a decreasing trend, and the gas phase permeability flow rate shows an increasing trend. The research results can provide theoretical basis and experimental reference for the research of CBM extraction technologies such as hydraulic fracturing and thermal injection in long flame coal reservoirs.
- long flame coal /
- gas water relative permeability /
- relative permeability /
- effective stress /
- pore pressure /
- temperature /
- residual water saturation

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图 1 煤样

Figure 1. Coal sample

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图 2 实验装置

Figure 2. Experimental device

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图 3 不同有效应力下长焰煤气水相渗曲线

Figure 3. Gas water relative permeability curves of long flame coal under different effective stresses

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图 4 长焰煤渗透率损失率随有效应力变化曲线

Figure 4. Change curve of permeability loss rate of long flame coal with effective stress

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图 5 不同孔隙压力下长焰煤气水相渗曲线

Figure 5. Gas water relative permeability curves of long flame coal under different pore pressures

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图 6 不同温度下长焰煤气水相渗曲线

Figure 6. Gas water relative permeability curves of long flame coal under different temperatures

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图 7 不同温度下气相有效渗透率变化曲线

Figure 7. Change curve of gas phase effective permeability under different temperatures

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图 8 不同温度下气相渗流量变化曲线

Figure 8. Change curve of gas phase seepage flow under different temperatures

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表 1 不同温度下甲烷动力黏度

Table 1. Methane dynamic viscosity under different temperatures

温度/℃	20	40	60	80
甲烷动力黏度/（10⁻³mPa·s）	10.806	11.502	12.140	12.699

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表 2 不同有效应力下气水相渗实验参数

Table 2. Experimental parameters of gas water relative permeability under different effective stress

围压/MPa	轴压/MPa	有效应力/MPa	气相	水相	孔隙压力/MPa	温度/℃
5	4	3.7	甲烷	水	2	20
7	6	5.7	甲烷	水	2	20
9	8	7.7	甲烷	水	2	20

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表 3 不同孔隙压力下气水相渗实验参数

Table 3. Experimental parameters of gas water relative permeability under different pore pressures

围压/MPa	轴压/MPa	有效应力/MPa	气相	水相	孔隙压力/MPa	温度/℃
7	6	5.7	甲烷	水	2	20
7	6	5.7	甲烷	水	4	20
7	6	5.7	甲烷	水	6	20

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表 4 不同温度下气水相渗实验参数

Table 4. Experimental parameters of gas water relative permeability under different temperatures

围压/MPa	轴压/MPa	有效应力/MPa	气相	水相	孔隙压力/MPa	温度/℃
7	6	5.7	甲烷	水	2	20
7	6	5.7	甲烷	水	2	40
7	6	5.7	甲烷	水	2	60
7	6	5.7	甲烷	水	2	80

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表 5 不同有效应力下气水相渗实验结果

Table 5. Experimental results of gas water relative permeability under different effective stress

有效应力/MPa	残余水饱和度/%	等渗点饱和度/%	等渗点相对渗透率
3.7	18.73	46.59	0.11
5.7	19.90	57.10	0.21
7.7	22.71	60.85	0.25

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表 6 不同孔隙压力下气水相渗实验结果

Table 6. Experimental results of gas water relative permeability under different pore pressure

孔隙压力/MPa	残余水饱和度/%	等渗点饱和度/%	等渗点相对渗透率
2	19.9	57.1	0.21
4	17.2	60.7	0.19
6	16.1	62.4	0.12

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表 7 不同温度下气水相渗实验结果

Table 7. Experimental results of gas water relative permeability under different temperatures

温度/℃	气相绝对渗透率/ 10⁻³ μm²	残余水饱和度/%	等渗点饱和度/%	等渗点相对渗透率
20	1.13	19.9	57.1	0.21
40	0.91	13.1	55.4	0.30
60	0.94	8.3	47.9	0.36
80	1.01	6.9	23.3	0.29

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