Directional downhole drill apparatus
US4852669A · kind A · utility
12Cited by
12References
6Claims
0Family size
Inventor
Key dates
| Filing date | May 9, 1988 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | May 9, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/068
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus is provided whereby a standard percussive-type downhole drill may be utilized in directional drilling. This eliminates the need for less efficient tri-cone type downhole motors in this application. A motor is provided directly on top of the hammer at the end of the drill string, which both rotates the hammer and allows the passage of compressed air to the hammer for its piston operation. A preferred embodiment of the motor is an air-driven turbine with a replaceable connecting subassembly to link the motor shaft to the hammer apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.