超临界CO2吸附引起煤体变形及吸附应力的研究

doi:10.12068/j.issn.1005-3026.2023.05.016

东北大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (5): 726-734.DOI: 10.12068/j.issn.1005-3026.2023.05.016

超临界CO₂吸附引起煤体变形及吸附应力的研究

王磊，杨栋，邢俊旺

(太原理工大学原位改性采矿教育部重点实验室，山西太原030024)

发布日期:2023-05-24
通讯作者: 王磊
作者简介:王磊(1992-)，男，山西灵石人，太原理工大学副研究员；杨栋(1970-)，男，山西繁峙人，太原理工大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(52104144，51974191)；国家重点研发计划项目(2019YFA0705501)；山西省基础研究项目(20210302124136).

Study on Coal Deformation and Adsorption Stress Caused by Supercritical CO₂ Adsorption

WANG Lei， YANG Dong， XING Jun-wang

Key Laboratory of In-situ Property Improving Mining of Ministry of Education， Taiyuan University of Technology， Taiyuan 030024， China.

Published:2023-05-24
Contact: WANG Lei
About author:-
Supported by:
-

摘要/Abstract

摘要： 对煤体恒温吸附氦气/超临界CO₂及变形进行测试试验，对煤体产生的轴向变形和径向变形实时监测，揭示有效应力作用和吸附应力作用分别引起的煤体膨胀变形量以及煤体对超临界CO₂的吸附应力.研究结果表明:煤体吸附不同气体表现出的轴向应变值要高于径向应变，氦气和超临界CO₂引起的煤体应变随注气压力的变化规律具有相似性.在温度升高过程中，煤体吸附氦气体积应变表现为先增后减的特征，而煤体吸附超临界CO₂体积应变逐步减小.随着温度的升高，煤体吸附超临界CO₂过程中煤体变形从吸附应力引起的变形占主导逐渐转变为有效应力引起的变形占主导，吸附应力体积应变与有效应力体积应变之比在逐步减小.煤体对超临界CO₂的吸附应力随着温度的升高而减小，温度从60℃增加到80℃，吸附应力仅降低了29%，同时超临界CO₂与瓦斯吸附应力的比值在60℃达到最大，该温度下超临界CO₂驱替瓦斯效果最优.

关键词: 吸附变形；吸附应力；有效应力；超临界CO₂；热力耦合

Abstract: The constant temperature adsorption of helium/supercritical CO₂(SC-CO₂) and deformation of coal are tested， the axial deformation and radial deformation of coal are real-time monitored， and the coal expansion deformation caused by effective stress and adsorption stress and the adsorption stress of coal to SC-CO₂ are revealed. The results show that the axial strain by coal adsorption of different gases is higher than the radial strain， and the variation law of coal strain caused by helium and SC-CO₂ with gas injection pressure is similar. In the process of increasing the temperature， the volume strain of coal adsorbed helium increased first and then decreased， while the volume strain of coal adsorbed SC-CO₂ gradually decreased. With the increase of temperature， the deformation of coal during the adsorption of SC-CO₂ gradually changed from the deformation caused by adsorption stress to the deformation caused by effective stress. The ratio of the volume strain of adsorption stress to the volume strain of effective stress is gradually decreased. The adsorption stress of coal to SC-CO₂ decreases with the increase of temperature. When the temperature increases from 60℃ to 80℃， the adsorption stress only decreases by 29%. At the same time， the ratio of SC-CO₂ adsorption stress to gas adsorption stress reaches the maximum at 60 ℃， and the SC-CO₂ has the best gas displacement effect at this temperature.

Key words: adsorption deformation; adsorption stress; effective stress; supercritical CO₂(SC-CO₂); thermal mechanical coupling

中图分类号:

TD801

王磊，杨栋，邢俊旺. 超临界CO₂吸附引起煤体变形及吸附应力的研究[J]. 东北大学学报（自然科学版）, 2023, 44(5): 726-734.

WANG Lei， YANG Dong， XING Jun-wang. Study on Coal Deformation and Adsorption Stress Caused by Supercritical CO₂ Adsorption[J]. Journal of Northeastern University(Natural Science), 2023, 44(5): 726-734.

参考文献

[1]邢俊旺，杨栋，康志勤，等.应力约束下煤体吸附解吸瓦斯变形特性的试验研究［J］.煤矿安全，2018，49(10):9-12.(Xing Jun-wang，Yang Dong，Kang Zhi-qin，et al.Experimental study on gas deformation characteristics of adsorption and coal under stress constraints［J］.Safety in Coal Mines，2018，49(10):9-12.)
[2]邹才能，杨智，朱如凯，等.中国非常规油气勘探开发与理论技术进展［J］.地质学报，2015，89(6):979-1007.(Zou Cai-neng，Yang Zhi，Zhu Ru-kai，et al.Progress in China′s unconventional oil & gas exploration and development and theoretical technologies［J］.Acta Geologica Sinica，2015，89(6):979-1007.)
[3]孙可明，辛利伟，王婷婷，等超临界CO₂气爆煤体致裂规律模拟研究［J］.中国矿业大学学报，2017，46(3):501-506.(Sun Ke-ming，Xin Li-wei，Wang Ting-ting，et al.Simulation research on law of coal fracture caused by supercritical CO₂ explosion［J］.Journal of China University of Mining & Technology，2017，46(3):501-506.)
[4]Cai C，Kang Y，Wang X，et al.Experimental study on shale fracturing enhancement by using multi-times pulse supercritical carbon dioxide(SC-CO₂) jet［J］.Journal of Petroleum Science and Engineering，2019，178: 948-963.
[5]Siemons N，Busch A.Measurement and interpretation of supercritical CO₂ sorption on various coals［J］.International Journal of Coal Geology， 2007， 69(4):229-242.
[6]Romanov V，Soong Y.Long-term CO₂ sorption on upper freeport coal powder and lumps［J］.Energy Fuels，2008，22(2):1167-1169.
[7]Levine J R. Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs［C］//Gayer R， Harris I. Coalbed Methane and Coal Geology.［S.l.］: Geological Society Special Publication，1996: 197-212.
[8]Chikatamarla L， Cui X， Bustin R M. Implications of volumetric swelling/shrinkage of coal in sequestration of acid gases［C］//2004 International Coalbed Methane Symposium Proceedings.Tuscaloosa，Alabama:［s.n.］，2004: 3-7.
[9]Day S，Fry R，Sakurovs R.Swelling of coal in carbon dioxide，methane and their mixtures［J］.International Journal of Coal Geology，2012，93:40-48.
[10]Majewska Z，Zie，tek J.Changes of acoustic emission and strain in hard coal during gas sorption-desorption cycles［J］.International Journal of Coal Geology，2007，70(4):305-312.
[11]Reucroft P J，Patel H.Gas-induced swelling in coal［J］.Fuel，1986，65(6):816-820.
[12]梁卫国，张倍宁，贺伟，等.不同阶煤超临界CO₂驱替开采CH₄试验研究［J］.煤炭学报，2020，45(1):197-203.(Liang Wei-guo，Zhang Bei-ning，He Wei，et al.Experimental research on supercritical CO₂ enhanced coalbed methane recovery in different rank coals［J］.Journal of China Coal Society，2020，45(1):197-203.)
[13]孙可明，李天舒.超临界CO₂作用下煤体膨胀变形理论模型［J］.煤炭学报，2020，45(4):1419-1426.(Sun Ke-ming，Li Tian-shu.Theoretical model of coal swelling deformation under supercritical carbon dioxide action［J］.Journal of China Coal Society，2020，45(4):1419-1426.)
[14]Perera M S A，Gamage R P，Rathnaweera T D，et al.A review of CO₂-enhanced oil recovery with a simulated sensitivity analysis［J］.Energies，2016，9(7):1-22.
[15]杨天鸿，陈立伟，杨宏民，等.注CO₂促排煤层瓦斯机制转化过程实验研究［J］.东北大学学报(自然科学版)，2020，41(5):623-628.(Yang Tian-hong，Chen Li-wei，Yang Hong-min，et al.Experimental study on the conversion process of promoting gas drainage mechanism by CO₂ injection［J］.Journal of Northeastern University(Natural Science)， 2020，41(5):623-628.)
[16]李波波，王斌，杨康，等.应力与温度综合作用的煤岩渗透机理［J］.中国矿业大学学报，2020，49(5):844-855.(Li Bo-bo，Wang Bin，Yang Kang，et al.Coal seepage mechanism effected by stress and temperature［J］.Journal of China University of Mining & Technology，2020，49(5):844-855.)

超临界CO₂吸附引起煤体变形及吸附应力的研究

Study on Coal Deformation and Adsorption Stress Caused by Supercritical CO₂ Adsorption

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 1

编辑推荐

Metrics

本文评价