{"title":"Multi-field coupling theory and research progress of methane extraction in deep coal seams: A review","authors":"Youping Xu , Ting Liu , Baiquan Lin","doi":"10.1016/j.jngse.2022.104796","DOIUrl":null,"url":null,"abstract":"<div><p><span>Methane extraction in deep coal seams<span> is a multi-field coupling process affected by multiple factors, and a systematic multi-field coupling theory is of guiding significance for ensuring the safety and efficiency of such extraction. In this study, the theoretical framework was constructed for the multi-field coupling theory of methane extraction in coal mines. First, the key scientific issues were identified. Subsequently, based on the stress distribution and structure of the coal seam, the longwall panel was divided into three zones, i.e., the virgin zone, the excavation disturbed zone and the goaf. Furthermore, the research progress of multi-field coupling during methane extraction were analyzed for the three zones, respectively. Finally, the deficiencies of current researches on multi-field coupling theory for methane extraction were revealed, and the future research directions were pointed out. The following research findings were obtained: Deep coal mining is accompanied by a notable multi-field coupling phenomenon, and the occurrence of compound disasters promote the difficulty in disaster control. However, we can adopt appropriate measures to decouple compound disasters after fully grasping the triggering mechanism and development process of the fields. In this way, the disasters can be controlled separately. In addition, from the perspective of the whole longwall panel, the main development directions are to reveal the </span></span>gas flow in cross-scale structures and to develop a unified model for gas migration in the multi-scale structure.</p></div>","PeriodicalId":372,"journal":{"name":"Journal of Natural Gas Science and Engineering","volume":null,"pages":null},"PeriodicalIF":4.9000,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Natural Gas Science and Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1875510022003821","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 6
Abstract
Methane extraction in deep coal seams is a multi-field coupling process affected by multiple factors, and a systematic multi-field coupling theory is of guiding significance for ensuring the safety and efficiency of such extraction. In this study, the theoretical framework was constructed for the multi-field coupling theory of methane extraction in coal mines. First, the key scientific issues were identified. Subsequently, based on the stress distribution and structure of the coal seam, the longwall panel was divided into three zones, i.e., the virgin zone, the excavation disturbed zone and the goaf. Furthermore, the research progress of multi-field coupling during methane extraction were analyzed for the three zones, respectively. Finally, the deficiencies of current researches on multi-field coupling theory for methane extraction were revealed, and the future research directions were pointed out. The following research findings were obtained: Deep coal mining is accompanied by a notable multi-field coupling phenomenon, and the occurrence of compound disasters promote the difficulty in disaster control. However, we can adopt appropriate measures to decouple compound disasters after fully grasping the triggering mechanism and development process of the fields. In this way, the disasters can be controlled separately. In addition, from the perspective of the whole longwall panel, the main development directions are to reveal the gas flow in cross-scale structures and to develop a unified model for gas migration in the multi-scale structure.
期刊介绍:
The objective of the Journal of Natural Gas Science & Engineering is to bridge the gap between the engineering and the science of natural gas by publishing explicitly written articles intelligible to scientists and engineers working in any field of natural gas science and engineering from the reservoir to the market.
An attempt is made in all issues to balance the subject matter and to appeal to a broad readership. The Journal of Natural Gas Science & Engineering covers the fields of natural gas exploration, production, processing and transmission in its broadest possible sense. Topics include: origin and accumulation of natural gas; natural gas geochemistry; gas-reservoir engineering; well logging, testing and evaluation; mathematical modelling; enhanced gas recovery; thermodynamics and phase behaviour, gas-reservoir modelling and simulation; natural gas production engineering; primary and enhanced production from unconventional gas resources, subsurface issues related to coalbed methane, tight gas, shale gas, and hydrate production, formation evaluation; exploration methods, multiphase flow and flow assurance issues, novel processing (e.g., subsea) techniques, raw gas transmission methods, gas processing/LNG technologies, sales gas transmission and storage. The Journal of Natural Gas Science & Engineering will also focus on economical, environmental, management and safety issues related to natural gas production, processing and transportation.