Steerable piloted drill bit, drill system, and method of drilling curved boreholes
US8960329B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 11, 2008 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Nov 12, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/064
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides apparatus and methods for controlled steering. One embodiment of the invention provides a bit body comprising a trailing end, a pilot section, and a reaming section. The trailing end is adapted to be detachably secured to a drill string. The pilot section is located on a leading, opposite end of the bit body. The reaming section is located intermediate to the leading and trailing ends. The pilot section comprises at least one steering device for steering the pilot section of the bit body, thereby steering the entire bit body. Another embodiment of the invention provides a wellsite system comprising a drill string; a kelly coupled to the drill string; and a bit body as described above. Another embodiment of the invention provides a method of drilling a curved borehole in a subsurface formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.