کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
1757085 1523008 2016 35 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Impact of creep on the evolution of coal permeability and gas drainage performance
ترجمه فارسی عنوان
اثر خزش در تکامل نفوذپذیری ذغال سنگ و عملکرد تخلیه گاز
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کلمات کلیدی
نفوذپذیری ذغال سنگ، خزش کامپوزیت زهکشی گاز شبیه سازی عددی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی
The results show that creep can have a significant impact (up to 25% or more) on coal permeability and gas drainage. This impact is function of coal properties such as directional elastic and viscoelastic moduli and reduction of pore pressure due to continuous desorption of gas. Comparison of improved and original models show that the impact of compaction creep on coal permeability becomes more pronounced owing to further pressure depletion toward the end of gas drainage process. It is also evident that the viscoelastic compaction creep as a result of gas pressure reduction from 6 MPa to 4 MPa induces a 5% decrease in permeability. A reduction of 13% in permeability was also achieved for pressure reduction of 4 MPa (from 6 MPa to 2 MPa). This indicates that coal permeability could be significantly overestimated if the impact of creep was not considered. The time and viscosity coefficient associated with creep were found to have negligible impact on coal permeability. This study proved that creep in coal is an important phenomenon that should be considered when conducting gas drainage performance analysis, particularly for soft coals. The improved permeability model and the fully coupled numerical model can be used to better predict gas drainage performance, and to improve the layout design of gas drainage boreholes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Natural Gas Science and Engineering - Volume 33, July 2016, Pages 469-482
نویسندگان
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