发明名称 |
REVERSE CIRCULATION BIT ASSEMBLY |
摘要 |
A drill bit assembly for boring including a drill bit and a bit sub. A front bit end has a plurality cutting elements at a forward face of the front bit end and a first fluid return passage extending through the drill bit to a rear bit end. The bit sub couples to the rear bit end. The bit sub includes a bore disposed at a front sub end sized and shaped to receive the rear bit end of the drill bit. A plurality of legs extends from a mid-sub region toward the front sub end between pairs of cutting elements. The plurality of legs has a fluid delivery passage disposed therein with the fluid delivery passage extending from the plurality of legs to a rear sub bit end. The bit sub has a second fluid return passage connecting the first fluid return passage to the rear sub bit end. |
申请公布号 |
CA2855717(A1) |
申请公布日期 |
2013.04.25 |
申请号 |
CA20122855717 |
申请日期 |
2012.10.17 |
申请人 |
ATLAS COPCO SECOROC LLC |
发明人 |
JONES, MARK L.;CURRY, KENNETH M.;ROSS, JEFFERY T.;JOHNSON, KYLE E. |
分类号 |
E21B10/32;E21B10/62 |
主分类号 |
E21B10/32 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|