Large Diameter and Fast Plug-in Type Spiral Drill Pipe for Drilling Down Screen Pipe Without Lifting

The technology and advantages are introduced about drilling down screen pipe without lifting, and a kind of large-diameter plug-in type spiral drill pipe for the screen pipe without lifting is developed, then the field tests are carried out in Sijiazhuang Coal Mine and Xinjing Coal Mine of Yangquan...

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Bibliographic Details

Published in:	Meikuang Anquan
Main Author:	YANG Huwei
Format:	Article
Language:	Chinese
Published:	Editorial Office of Safety in Coal Mines 2020-09-01
Subjects:	drill down screen pipe screen pipe hole protection air drilling spiral drilling fast plug-in spiral drill pipe
Online Access:	https://www.mkaqzz.com/cn/article/id/7155