Drilling large diameter cross-measure boreholes to improve gas drainage in highly gassy soft coal seams
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- 作者：Yabin Gaoa ; b ; cumtgyb@163.com" class="auth_mail" title="E-mail the corresponding author ; Baiquan Lina ; b ; Wei Yanga ; b ; cumt135@126.com" class="auth_mail" title="E-mail the corresponding author ; Ziwen Lia ; b ; Yuan Panga ; b ; He Lia ; b
- 关键词：Highly gassy soft coal seam ; Cross-measure borehole ; Water-jet technique ; Gas drainage
- 刊名：Journal of Natural Gas Science and Engineering
- 出版年：2015
- 出版时间：September 2015
- 年：2015
- 卷：26
- 期：Complete
- 页码：193-204
- 全文大小：3481 K
文摘
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The effects of increasing cross-measure borehole diameter on the radial permeability and the effective influence zone radius are discussed.
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A new method and a special equipment system for drilling large diameter cross-measure boreholes are developed.
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The stress redistribution interactions between boreholes are studied to evaluate the optimal distance between two cross-measure boreholes.
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The effective influence zone of the large diameter cross-measure borehole is tested in Pingdingshan coalfield, China.