HELICAL DRAG BIT AND METHOD OF USING THE SAME |
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| 申请号 | PCT/US2004026807 | 申请日 | 2004-08-18 | 公开(公告)号 | WO2005019593A3 | 公开(公告)日 | 2006-08-17 |
| 申请人 | UTD INC; HILL JOHN L III; BRENNAN MIKE; SHENHAR JORAM; KOCH DAVID; LOMBARDO MARK; DOLGIN BENJAMIN; GIRALDO LUIS B; | 发明人 | HILL JOHN L III; BRENNAN MIKE; SHENHAR JORAM; KOCH DAVID; LOMBARDO MARK; DOLGIN BENJAMIN; GIRALDO LUIS B; | ||||
| 摘要 | A helical drag bit provided with flights (20) of spirally/helically positioned cutting arms (10). The arms create a spiral trench geometry in the sidewall of the a predrilled pilot hole. The cutting arms terminate in scoring cutting blades. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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