Cargando…
Changes in pore structure of coal caused by coal-to-gas bioconversion
Microbial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure directly in...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5476654/ https://www.ncbi.nlm.nih.gov/pubmed/28630465 http://dx.doi.org/10.1038/s41598-017-04110-z |
_version_ | 1783244632125079552 |
---|---|
author | Zhang, Rui Liu, Shimin Bahadur, Jitendra Elsworth, Derek Wang, Yi Hu, Guanglong Liang, Yanna |
author_facet | Zhang, Rui Liu, Shimin Bahadur, Jitendra Elsworth, Derek Wang, Yi Hu, Guanglong Liang, Yanna |
author_sort | Zhang, Rui |
collection | PubMed |
description | Microbial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure directly influences gas storage and transport properties. Only limited studies have quantified the alteration of the nano-pore structure due to ME-CBM treatment. This study examines the evolution of the pore structure using a combination of small angle X-ray scattering (SAXS), low-pressure N(2) and CO(2) adsorption (LPGA) and high-pressure methane adsorption methods. The results show that the surface fractal dimension decreases for the two bioconverted coals compared to the untreated coal. After bio-treatment, the mesopore surface area and pore volume decrease with the average pore diameter increases, while the micropore surface area increases with pore volume decreases. Both inaccessible meso-/micropore size distributions decrease after bioconversion, while the accessible micropore size distribution increases, making a portion of closed micropore network accessible. In addition, the methane adsorption capacities increase after bio-treatment, which is confirmed by the increase of micropore surface area. A conceptual physical model of methanogenesis is proposed based on the evolution of the pore structure. |
format | Online Article Text |
id | pubmed-5476654 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-54766542017-06-23 Changes in pore structure of coal caused by coal-to-gas bioconversion Zhang, Rui Liu, Shimin Bahadur, Jitendra Elsworth, Derek Wang, Yi Hu, Guanglong Liang, Yanna Sci Rep Article Microbial enhanced coalbed methane (ME-CBM) recovery is critically examined as a viable technology for natural gas recovery from coalbed methane (CBM) reservoirs. Since the majority of gas-in-place (GIP) is stored as an adsorbed phase in fine pores of coal matrix, the nano-pore structure directly influences gas storage and transport properties. Only limited studies have quantified the alteration of the nano-pore structure due to ME-CBM treatment. This study examines the evolution of the pore structure using a combination of small angle X-ray scattering (SAXS), low-pressure N(2) and CO(2) adsorption (LPGA) and high-pressure methane adsorption methods. The results show that the surface fractal dimension decreases for the two bioconverted coals compared to the untreated coal. After bio-treatment, the mesopore surface area and pore volume decrease with the average pore diameter increases, while the micropore surface area increases with pore volume decreases. Both inaccessible meso-/micropore size distributions decrease after bioconversion, while the accessible micropore size distribution increases, making a portion of closed micropore network accessible. In addition, the methane adsorption capacities increase after bio-treatment, which is confirmed by the increase of micropore surface area. A conceptual physical model of methanogenesis is proposed based on the evolution of the pore structure. Nature Publishing Group UK 2017-06-19 /pmc/articles/PMC5476654/ /pubmed/28630465 http://dx.doi.org/10.1038/s41598-017-04110-z Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Zhang, Rui Liu, Shimin Bahadur, Jitendra Elsworth, Derek Wang, Yi Hu, Guanglong Liang, Yanna Changes in pore structure of coal caused by coal-to-gas bioconversion |
title | Changes in pore structure of coal caused by coal-to-gas bioconversion |
title_full | Changes in pore structure of coal caused by coal-to-gas bioconversion |
title_fullStr | Changes in pore structure of coal caused by coal-to-gas bioconversion |
title_full_unstemmed | Changes in pore structure of coal caused by coal-to-gas bioconversion |
title_short | Changes in pore structure of coal caused by coal-to-gas bioconversion |
title_sort | changes in pore structure of coal caused by coal-to-gas bioconversion |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5476654/ https://www.ncbi.nlm.nih.gov/pubmed/28630465 http://dx.doi.org/10.1038/s41598-017-04110-z |
work_keys_str_mv | AT zhangrui changesinporestructureofcoalcausedbycoaltogasbioconversion AT liushimin changesinporestructureofcoalcausedbycoaltogasbioconversion AT bahadurjitendra changesinporestructureofcoalcausedbycoaltogasbioconversion AT elsworthderek changesinporestructureofcoalcausedbycoaltogasbioconversion AT wangyi changesinporestructureofcoalcausedbycoaltogasbioconversion AT huguanglong changesinporestructureofcoalcausedbycoaltogasbioconversion AT liangyanna changesinporestructureofcoalcausedbycoaltogasbioconversion |