煤层液态CO<sub>2</sub>相变致裂半径预测研究

王长禄; 彭然; 郑义; 李伟; 姚海飞

doi:10.13272/j.issn.1671-251x.2023040076

煤层液态CO₂相变致裂半径预测研究

王长禄^{1, 2, 3,},
彭然^{1, 2, 3},
郑义^{1, 2, 3},
李伟^{1, 2, 3},
姚海飞^{1, 2, 3, 4}

1.
煤炭科学技术研究院有限公司矿山智能通风事业部，北京　100013
2.
煤科通安(北京) 智控科技有限公司，北京　100013
3.
北京市煤矿安全工程技术研究中心，北京　100013
4.
中国矿业大学(北京) 应急管理与安全工程学院，北京　100083

基金项目: 国家自然科学基金项目（52130409）；天地科技股份有限公司科技创新创业资金专项项目（2021-2-TD-MS001）。

详细信息

作者简介:
王长禄（1993—），男，辽宁丹东人，硕士，主要研究方向为安全评价及瓦斯灾害防治，E-mail：changlu202303@163.com

中图分类号: TD712
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出版历程
- 收稿日期: 2023-04-23
- 修回日期: 2023-10-13
- 网络出版日期: 2023-10-24
- 刊出日期: 2023-10-24

Research on the prediction of liquid CO₂ phase transition cracking radius in coal seams

WANG Changlu^{1, 2, 3,},
PENG Ran^{1, 2, 3},
ZHENG Yi^{1, 2, 3},
LI Wei^{1, 2, 3},
YAO Haifei^{1, 2, 3, 4}

1.
Mine Intelligent Ventilation Division, CCTEG China Coal Research Institute, Beijing 100013, China
2.
CCRI Tong'an(Beijing) Intelligent Control Technology Co., Ltd., Beijing 100013, China
3.
Beijing Engineering and Research Center of Mine Safe, Beijing 100013, China
4.
School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China

摘要

摘要: 预测致裂半径是确定液态CO₂相变致裂增透瓦斯抽采技术布孔间距的前提，直接影响瓦斯抽采效果。现有预测方法大多基于单因素。为掌握多因素对液态CO₂相变致裂半径的影响规律，有效预测布孔间距，采用ANSYS/LS−DYNA数值模拟软件，结合正交试验，开展了煤层液态CO₂相变致裂半径预测研究。数值模拟结果表明：影响液态CO₂相变致裂半径的因素主次顺序为地应力＞瓦斯压力＞煤体坚固性系数；致裂半径随地应力增大而减小，随瓦斯压力和煤体坚固性系数增大而增大，且呈线性关系。对数值模拟结果进行多元回归分析，建立了基于地应力、瓦斯压力及煤体坚固性系数3组不同因素耦合条件下的液态CO₂相变致裂半径预测模型。在煤矿现场进行工业性试验，基于预测模型计算结果设置抽采钻孔，采用压力指标法对瓦斯抽采效果进行测试分析，结果表明：液态CO₂相变致裂孔两侧观测孔的瓦斯压力随时间增加呈递减趋势，且抽采初期距致裂孔越远，则压力越大，与理论分析及数值模拟结果一致；液态CO₂相变有效致裂范围与预测结果基本相符；观测孔瓦斯抽采体积分数较自然抽采孔提高73.4%，瓦斯抽采效率显著提高。
- 瓦斯抽采 /
- 液态CO₂相变致裂增透 /
- 致裂半径预测 /
- 多因素耦合分析 /
- 正交设计 /
- 多元回归分析
Abstract: Predicting cracking radius is a prerequisite for determining the holes spacing of gas extraction technology by liquid CO₂ phase transition cracking and permeability improvement, which directly affects the gas extraction effect. Most existing prediction methods are based on single factor analysis. In order to grasp the influence of multiple factors on the radius of liquid CO₂ phase transition cracking and effectively predict the spacing between holes, ANSYS/LS-DYNA numerical simulation software is used to carry out the research on predicting the radius of coal seam liquid CO₂ phase transition cracking combing with orthogonal experiments. The numerical simulation results indicate that the order of factors affecting the radius of liquid CO₂ phase transition cracking is ground stress>gas pressure>coal solidity coefficient. The cracking radius decreases with the increase of stress, and increases with the increase of gas pressure and coal solidity coefficient with a linear relationship. A multiple regression analysis is conducted on the numerical simulation results. A prediction model for the radius of liquid CO₂ phase transition cracking is established based on three different coupling conditions of ground stress, gas pressure, and coal solidity coefficient. Industrial experiments are conducted on the coal mine site. Extraction boreholes are set up based on the predicted model calculation results. The pressure index method is used to test and analyze the gas extraction effect. The results show the following points. The gas pressure in the observation holes on both sides of the liquid CO₂ phase transition cracking hole shows a decreasing trend with time. The farther away from the cracking hole in the initial stage of extraction, the greater the gas pressure. It is consistent with theoretical analysis and numerical simulation results. The effective cracking range of liquid CO₂ phase transition is basically consistent with the predicted results. The gas volume fraction in the observation hole is 73.4% higher than that in the natural extraction hole, and the gas extraction efficiency is significantly improved.
- gas extraction /
- liquid CO₂ phase transition cracking and permeability improvement /
- prediction of cracking radius /
- multi factors coupling analysis /
- orthogonal design /
- multiple regression analysis

HTML全文

图 1 液态CO₂相变爆破裂隙发育分布

Figure 1. Fracture development distribution by liquid CO₂ phase transition blasting

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图 2 液态CO₂相变致裂数值模型

Figure 2. Numerical model of liquid CO₂ phase transition cracking

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图 3 液态CO₂相变致裂模拟演化过程

Figure 3. Simulated evolution process of liquid CO₂ phase transition cracking

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图 4 三因素耦合作用下的致裂效果

Figure 4. Cracking effect under three factors coupling

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图 5 各因素对液态CO₂相变致裂半径的影响

Figure 5. Influence of various factors on liquid CO₂ phase transition cracking radius

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图 6 现场工业性试验布孔方式

Figure 6. Borehole arrangement in industrial field test

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图 7 观测孔瓦斯压力变化

Figure 7. Gas pressure change of observation borehole

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图 8 钻孔瓦斯体积分数对比

Figure 8. Gas concentration comparison of different borehole

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表 1 煤体材料参数

Table 1 Coal material parameters

密度/ （g·cm⁻³）	弹性模量/MPa	泊松比	抗拉强度/MPa	抗压强度/MPa	黏聚力/ MPa
1.54	1.74	0.3	0.84	2.2	2.5

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表 2 模拟方案正交设计

Table 2 Orthogonal design of simulation scheme

组号	地应力/MPa	瓦斯压力/MPa	煤体坚固性系数	空白列
1	6	0.2	0.5	0
2	6	0.3	0.7	0
3	6	0.4	0.8	0
4	8	0.2	0.7	0
5	8	0.3	0.8	0
6	8	0.4	0.5	0
7	10	0.2	0.8	0
8	10	0.3	0.5	0
9	10	0.4	0.7	0

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表 3 致裂半径极差分析

Table 3 Range analysis of cracking radius

指标	地应力	瓦斯压力	煤体坚固性系数	空白列
均值1	2.518	2.117	2.182	2.234
均值2	2.234	2.234	2.244	2.234
均值3	1.950	2.350	2.275	2.234
极差	0.568	0.233	0.093	0

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表 4 正交设计方差分析

Table 4 Variance analysis of orthogonal design

指标		地应力	瓦斯压力	煤体坚固性系数
偏差平方和		0.484	0.082	0.013
自由度		2	2	2
F比值		3.344	0.566	0.090
显著度	置信度90%	*	*	*
	置信度95%	*	*	*
	置信度99%	*	*	*
注：*表示具有较高显著度。

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