不同含水率煤体液氮致裂渗透率变化规律及应力敏感性分析

张磊; 田苗苗; 卢硕; 李明雪; 李菁华

doi:10.16285/j.rsm.2021.0754

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不同含水率煤体液氮致裂渗透率变化规律及应力敏感性分析

基础理论与实验研究 | 更新时间：2026-06-25

- 不同含水率煤体液氮致裂渗透率变化规律及应力敏感性分析
- Analysis of permeability variation and stress sensitivity of liquid nitrogen fracturing coal with different water contents
- 岩土力学 2022年43卷第S1期页码：107-116
- 作者机构：
  
  1. 中国矿业大学矿业工程学院,江苏,徐州,221116
  2. 中国矿业大学煤炭资源与安全开采国家重点实验室,江苏,徐州,221116
  3. 中国矿业大学材料与物理学院,江苏,徐州,221116
- 作者简介：
- 基金信息：
  
  国家自然科学基金（No.52174129）;中国科协“青年人才托举工程”项目（No.2017QNRC001）
- DOI：10.16285/j.rsm.2021.0754
  中图分类号： TD315
- 网络首发：2022-07-13，
  
  纸质出版：2022
- 稿件说明：
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张磊, 田苗苗, 卢硕, 等. 不同含水率煤体液氮致裂渗透率变化规律及应力敏感性分析[J]. 岩土力学, 2022,43(S1):107-116.

ZHANG Lei, TIAN Miao-miao, LU Shuo, et al. Analysis of permeability variation and stress sensitivity of liquid nitrogen fracturing coal with different water contents[J]. 2022, 43(S1): 107-116.
张磊, 田苗苗, 卢硕, 等. 不同含水率煤体液氮致裂渗透率变化规律及应力敏感性分析[J]. 岩土力学, 2022,43(S1):107-116. DOI： 10.16285/j.rsm.2021.0754.

ZHANG Lei, TIAN Miao-miao, LU Shuo, et al. Analysis of permeability variation and stress sensitivity of liquid nitrogen fracturing coal with different water contents[J]. 2022, 43(S1): 107-116. DOI： 10.16285/j.rsm.2021.0754.

摘要

Atpresent

the technology of fracturing coal by liquid nitrogen is a new type ofanti-reflection technology of coal seam. Water content

coal rank andtemperature gradient all affect the anti-reflection of liquid nitrogen. Amongthem

water content has a significant effect on the anti-reflection effect ofliquid nitrogen cracking. In order to study the effect and mechanism of watercontent on liquid nitrogen cracking

four groups of coal samples with watercontents of 0%

4% and 6% were treated by liquid nitrogen leachingrespectively

permeability tester is used to test gas phase permeability ofcoal samples

and the permeability and stress sensitivity of coal samples atdifferent pressure points were discussed and analyzed. Some findings wereobtained. (i) Under the same confining pressure

the variation trend of gasphase permeability with effective stress generally accords with negativeexponential function k = ae−bs + c

and the correlation indexes are all greater than 0.95. (ii) When the effectivestress exceeds a certain critical value

the gas permeability of coal sample isaffected by Klinkenberg effect and presents an upward trend with the increaseof the effective stress. (iii) The increase of water content of coal sample cansignificantly promote the fracturing effect of liquid nitrogen. The mostobvious is that when water content increases from 2% to 4%

the increase ofpermeability before and after fracturing increases from 92.88% to 357.12%. (iv)The normalized permeability of coal samples before and after liquid nitrogenfracturing is treated

and it is found that coal moisture has both a negativeeffect of blocking seepage and a promoting effect of improving the fracturingeffect. The normalized permeability of coal samples before and after fracturingis complicated under the combined effect of moisture. (v) Under the same porepressure

the effective stress sensitivity of coal decreases gradually with theincrease of effective stress

and it can be significantly improved by liquidnitrogen fracturing.

Abstract

At present

the technology of fracturing coal by liquid nitrogen is a new type of anti-reflection technology of coal seam.Water content

coal rank and temperature gradient all affect the anti-reflection of liquid nitrogen. Among them

water content has a significant effect on the anti-reflection effect of liquid nitrogen cracking. In order to study the effect and mechanism of water content on liquid nitrogen cracking

four groups of coal samples with water contents of 0%

4% and 6% were treated by liquid nitrogen leaching respectively

permeability tester is used to test gas phase permeability of coal samples

and the permeability and stress sensitivity of coal samples at different pressure points were discussed and analyzed. Some findings were obtained.（i） Under the same confining pressure

the variation trend of gas phase permeability with effective stress generally accords with negative exponential function k = ae

-bσ

+ c

and the correlation indexes are al

l greater than 0.95.（ii） When the effective stress exceeds a certain critical value

the gas permeability of coal sample is affected by Klinkenberg effect and presents an upward trend with the increase of the effective stress.（iii） The increase of water content of coal sample can significantly promote the fracturing effect of liquid nitrogen.The most obvious is that when water content increases from 2% to 4%

the increase of permeability before and after fracturing increases from 92.88% to 357.12%.（iv） The normalized permeability of coal samples before and after liquid nitrogen fracturing is treated

and it is found that coal moisture has both a negative effect of blocking seepage and a promoting effect of improving the fracturing effect. The normalized permeability of coal samples before and after fracturing is complicated under the combined effect of moisture.（v） Under the same pore pressure

the effective stress sensitivity of coal decreases gradually with the increase of effective stress

and it can be significantly improved by liquid nitrogen fracturing.

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