Steerable drilling tool and system
US5617926A · kind A · utility
61Cited by
28References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Sep 14, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A steerable rotary drilling tool includes a drill bit mounted on the lower end of a housing by a drive shaft having an articulative coupling that allows the bit's rotation axis to be inclined relative to the rotation axis of the housing, an eccentric weight in the housing that maintains the bit axis pointed in only one direction in space as the bit is turned by the housing, and a clutch system that allows such direction to be changed downhole. A measuring-while-drilling tool is included to allow the progress of the drilling to be monitored at the surface, and to allow changing the bit axis or toolface by a selected amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.