发明名称 |
HYBRID DRILL BIT WITH COUNTER-ROTATION CUTTERS IN CENTER |
摘要 |
A hybrid drill bit includes both fixed cutting elements and rotational cutting elements thereon. The fixed cutting elements are affixed to a bit body and define a peripherally-located fixed cutting structure disposed radially outward of the rotational cutting elements. The rotational cutting elements define a centrally-located counter-rotational cutting structure including two hemispherical counter-rotational cutting members mounted for counter-rotation with respect to one another on an axis generally perpendicular to a bit body rotational axis. |
申请公布号 |
WO2017014730(A1) |
申请公布日期 |
2017.01.26 |
申请号 |
WO2015US40978 |
申请日期 |
2015.07.17 |
申请人 |
HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
ANDERLE, Seth Garrett;GROSZ, Gregory |
分类号 |
E21B10/42;E21B10/43;E21B10/62 |
主分类号 |
E21B10/42 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|