کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6747736 1429514 2018 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis on the multi-phase flow characterization in cross-measure borehole during coal hydraulic slotting
ترجمه فارسی عنوان
تجزیه و تحلیل ویژگی های جریان چند فاز در گودال متقابل در حین جابجایی هیدرولیک زغال سنگ
کلمات کلیدی
افت فشار هیدرولیک زغال سنگ، گودال اندازه گیری مجدد، سوراخ چاله، رها کردن الگوی جریان،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی اقتصادی
چکیده انگلیسی
Hydraulic slotting in a gas drainage borehole is an effective method of enhancing gas drainage performance. However, it frequently occurs that a large amount of slotting products (mainly the coal slurry and gas) intensely spurt out of the borehole during the slotting, which adversely affects the slotting efficiency. Despite extensive previous investigations on the mechanism and prevention-device design of the spurt during ordinary borehole drilling, a very few studies has focused on the spurt in the slotting process. The slotting spurt is mainly caused by two reasons: the coal and gas outburst in the borehole and the borehole deslagging blockage. This paper focuses on the second reason, and investigates the hydraulic deslagging flow patterns in the annular space between the drill pipe and borehole wall. Results show that there are six deslagging flow patterns when the drill pipe is still: pure slurry flow, pure gas flow, bubble flow, intermittent flow, layering flow and annular flow. When the drill pipe rotates, each of those six flow patterns changes due to the Taylor vortex effect. Outcomes of this study could help to better understand the slotting-spurt mechanism and provide guidance on the anti-spurt strategies through eliminating the borehole deslagging blockage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mining Science and Technology - Volume 28, Issue 4, July 2018, Pages 701-705
نویسندگان
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