Technique for steering a downhole hammer
US4867255A · kind A · utility
56Cited by
36References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | May 20, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/58
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is disclosed herein an apparatus for providing an underground tunnel utilizing a steerable pneumatically powered, elongated percussive downhole hammer having a forwardmost cutting bit which is asymmetrically configured with respect to the elongation axis of the hammer. This hammer is steered through the ground, that is, made to move along a straight path or a particular curved path, by controlling the way in which it is pneumatically powered and/or the way in which it is urged forward and/or the way in which its cutting bit is rotated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.