Impact of matrix swelling area propagation on the evolution of coal permeability under coupled multiple processes
文献类型：期刊论文
| 作者 | Qu, Hongyan1,2; Liu, Jishan3; Pan, Zhejun4; Connell, Luke4 |
| 刊名 | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
 |
| 出版日期 | 2014 |
| 卷号 | 18页码:451-466 |
| 关键词 | Coal permeability Temperature Gas sorption Swelling area Coupled multiphysics |
| ISSN号 | 1875-5100 |
| DOI | 10.1016/j.jngse.2014.04.007 |
| 英文摘要 | In coal permeability models, it is normally assumed that coal matrix pressure is equalized with the fracture pressure (local equilibrium). In this assumption, coal swells uniformly under constant confining (total) stress conditions commonly used in laboratory measurements. Under these conditions, a uniform swelling will not change the fracture aperture for a matchstick model where only two sets of vertical fractures cut through the whole matrix blocks. However, a uniform swelling changes both the fracture aperture and the spacing (the coal bridge swelling increases the fracture aperture while the matrix swelling changes the spacing only) for a fractured coal model, where fractures do not create a full separation between adjacent matrix blocks but where solid coal bridges are present, is used. Therefore, coal permeability remains unchanged for a matchstick model or increases slightly due to the coal bridge swelling under common laboratory conditions. These conclusions are directly contradictory with most laboratory observations in the literature. This direct contradiction suggests that the local equilibrium condition has not been achieved under common laboratory conditions. If this was the case, the current local equilibrium assumption based approach would be inappropriate for the analysis of laboratory measurements. In our previous studies, we introduced a concept of matrix swelling transition from local to global under stress conditions. In this concept, we recognized the fact that coal permeability evolves as a function of time from the initial equilibrium state (both matrix pressure and fracture pressure are equal to the initial reservoir pressure) to the final equilibrium state (both matrix pressure and fracture pressure are equal to the injection pressure). In this study, we extended this concept to the most complex situations where multiple processes (thermal transport, gas transport and coal deformation) are involved. Based on the concept of matrix swelling transition, we introduced a new concept of Critical Swelling Area that defines the relationship between swelling transition and coal permeability evolution. The combination of swelling transition and Critical Swelling Area concepts can explain why adsorptive types of gas injection reduces coal permeability in the early stage of the injection and may rebound later. (C) 2014 Elsevier B.V. All rights reserved. |
| WOS研究方向 | Energy & Fuels ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000337662200053 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/3599]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.China Univ Petr, State Key Lab Petr Resources & Prospecting ; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 3.Univ Western Australia, Sch Mech & Chem Engn; 4.CSIRO Earth Sci & Resource Engn |
| 推荐引用方式 GB/T 7714 | Qu, Hongyan,Liu, Jishan,Pan, Zhejun,et al. Impact of matrix swelling area propagation on the evolution of coal permeability under coupled multiple processes[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2014,18:451-466. |
| APA | Qu, Hongyan,Liu, Jishan,Pan, Zhejun,&Connell, Luke.(2014).Impact of matrix swelling area propagation on the evolution of coal permeability under coupled multiple processes.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,18,451-466. |
| MLA | Qu, Hongyan,et al."Impact of matrix swelling area propagation on the evolution of coal permeability under coupled multiple processes".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 18(2014):451-466. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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