Steerable earth boring assembly with differential braking
US10745970B2 · kind B2 · utility
0Cited by
2References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 23, 2018 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Jan 8, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/046
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A steerable earth boring assembly which includes an annular collar and a drive shaft with a drill bit, where the shaft pivots with respect to the collar. An upper portion of the shaft inserts into an orientation sleeve which resides in the collar. An axial bore is obliquely formed through the orientation sleeve, and in which the upper portion inserts. An angular offset between the drive shaft and collar is changed by adjusting azimuthal positions of the orientation sleeve with respect to the collar. A brake assembly is included for applying a restraining force onto the orientation sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.