基于CT扫描的CO<sub>2</sub>相变致裂煤裂隙演化特征

刘高峰; 关文博; 张震; 李宝林; 刘欢; 司念

doi:10.19606/j.cnki.jmst.2024.03.003

基于CT扫描的CO₂相变致裂煤裂隙演化特征

doi: 10.19606/j.cnki.jmst.2024.03.003

刘高峰^{1, 2, 3,},
关文博¹,
张震¹,
李宝林¹,
刘欢¹,
司念¹

1.
河南理工大学资源环境学院，河南焦作 454003
2.
河南理工大学煤炭安全生产与清洁高效利用省部共建协同创新中心，河南焦作 454003
3.
河南理工大学中原经济区煤层(页岩)气河南省协同创新中心，河南焦作 454003

基金项目:

国家自然科学基金 42230814

国家自然科学基金 42372204

河南省高等学校重点科研项目 24B170005

河南省科技攻关项目 242102320365

详细信息

作者简介:
刘高峰(1982—)，男，河南沁阳人，博士，副教授，博士生导师，主要从事瓦斯地质与煤层气开发等方面的研究工作。Tel：13639624360，E-mail：liugaofeng82@163.com

中图分类号: TD712
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- 被引次数: 0
出版历程
- 收稿日期: 2024-01-24
- 修回日期: 2024-04-05
- 刊出日期: 2024-06-30

Evolution characteristics on coal fractures induced with CO₂ phase transition fracturing based on CT scanning

LIU Gaofeng^{1, 2, 3
,},
GUAN Wenbo¹,
ZHANG Zhen¹,
LI Baolin¹,
LIU Huan¹,
SI Nian¹

1.
School of Resources & Environment, Henan Polytechnic University, Jiaozuo Henan 454003, China
2.
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Jiaozuo Henan 454003, China
3.
Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Polytechnic University, Jiaozuo Henan 454003, China

摘要

摘要:
为进一步揭示CO₂相变致裂煤的裂隙改造机理，开展了CO₂相变致裂煤体实验，基于CT扫描和三维裂隙重构，分析了CO₂相变致裂前后的煤样内部裂隙结构参数，查明了CO₂相变致裂煤的三维裂隙结构演化特征。结果表明，致裂后煤样的裂隙总数量减少，裂隙总体积和裂隙总表面积增加；CO₂相变致裂产生了裂隙扩张转化效应，在致裂压力的扩张作用下，小尺度裂隙转化为更大尺度的裂隙；长度小于1 000 μm的裂隙数量减少、裂隙体积和表面积明显减小，长度大于1 000 μm的裂隙体积和表面积明显增大，且裂隙之间扩张贯通而引起其数量减少；CO₂相变致裂大幅度改善了煤体三维裂隙的连通性，有利于气体的运移和产出。此研究为CO₂相变致裂效果提供新的分析评价方法，也可为其他非常规天然气储层及其改造的裂隙演化特征研究提供参考和借鉴。
- CO₂相变致裂 /
- CT扫描 /
- 煤储层 /
- 三维裂隙演化
Abstract:
This study conducted the CO₂-PTF coal experiment to further reveal the fracturing transformation mechanism of CO₂ phase transition fracturing(CO₂-PTF)coal. According to the CT scanning and 3D fracture reconstruction, we analyzed the fracture structure parameters of coal before and after CO₂-PTF, and clarified the evolution characteristics of the three-dimensional fracture structure of coal induced by CO₂-PTF. The research results indicated that after CO₂-PTF, the total number of fractures in the coal sample decreased, while the total volume and surface area of fractures increased. The CO₂-PTF generated fracture expansion and transformation effects where the small-scale fractures were expanded and transformed into larger scale fractures under the CO₂-PTF pressure. The number, volume, and surface area of fractures of less than 1 000 μm in length were significantly reduced, while the volume and surface area of fractures of longer than 1 000 μm in length were significantly increased. The expansion and connection between fractures caused a decrease in their quantity. CO₂-PTF improves the connectivity of the three-dimensional fracture in coal and is conducive to gas migration and production. This study offers new insights into and evaluation method for the effect of CO₂-PTF, and could provide references for the research on fracture evolution characteristics in other unconventional natural gas reservoirs and their modifications.
- CO₂ phase transition fracturing /
- CT scanning /
- coal reservoir /
- three dimensional fracture evolution

HTML全文

图 1 CO₂相变致裂实验装置

Figure 1. Experimental device of CO₂ phase transition fracturing

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图 2 煤体CT扫描装置

Figure 2. CT scanning device for coal

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图 3 CO₂相变致裂煤的不同角度纵切面二值化

Figure 3. Binarization of longitudinal sections with different angles in the coal sample with CO₂-PTF

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图 4 CO₂相变致裂同一煤样不同角度三维裂隙重构

Figure 4. 3D fracture reconstruction of the coal samples before and after CO₂-PTF

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图 5 三维裂隙结构特征

Figure 5. 3D fracture structure characteristics

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图 6 CO₂相变致裂煤的裂隙数量、体积与表面积变化

Figure 6. Number, volume, and surface area variation of fracture in the coal samples before and after CO₂-PTF

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图 7 CO₂相变致裂煤的裂隙演化示意图

Figure 7. Schematic diagram of fracture evolution in coal induced with CO₂-PTF

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表 1 煤样工业分析

Table 1. Proximate analysis of coal %

空气干燥基水分	空气干燥基灰分	干燥无灰基挥发分	最大镜质体反射率
0.97	10.03	24.91	1.22

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表 2 煤样裂隙结构参数

Table 2. Fractures structurale parameters of for coal samples

煤样	裂隙总数量/条	裂隙总体积/mm³	裂隙总表面积/mm²
原始煤样	129 500	564.72	24 630.50
致裂煤样	49 313	2 782.58	36 838.00

下载: 导出CSV

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基于CT扫描的CO₂相变致裂煤裂隙演化特征

doi: 10.19606/j.cnki.jmst.2024.03.003

作者简介:
刘高峰(1982—)，男，河南沁阳人，博士，副教授，博士生导师，主要从事瓦斯地质与煤层气开发等方面的研究工作。Tel：13639624360，E-mail：liugaofeng82@163.com

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Evolution characteristics on coal fractures induced with CO₂ phase transition fracturing based on CT scanning

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基于CT扫描的CO2相变致裂煤裂隙演化特征

doi: 10.19606/j.cnki.jmst.2024.03.003

作者简介: 刘高峰(1982—)，男，河南沁阳人，博士，副教授，博士生导师，主要从事瓦斯地质与煤层气开发等方面的研究工作。Tel：13639624360，E-mail：liugaofeng82@163.com

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Evolution characteristics on coal fractures induced with CO2 phase transition fracturing based on CT scanning

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基于CT扫描的CO₂相变致裂煤裂隙演化特征

作者简介:
刘高峰(1982—)，男，河南沁阳人，博士，副教授，博士生导师，主要从事瓦斯地质与煤层气开发等方面的研究工作。Tel：13639624360，E-mail：liugaofeng82@163.com

Evolution characteristics on coal fractures induced with CO₂ phase transition fracturing based on CT scanning