Apparatus for unscrewing drill pipe sections
US5996444A · kind A · utility
24Cited by
5References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Oct 30, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/163
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Pipe sections of a drill string are unscrewed by holding one pipe section stationary in a clamping arm, and rotating another pipe section by a turning wrench. The clamping arm includes an adapter that can be replaced by similar adapters sized for different pipe diameter. The turning wrench includes a lug arranged to be contacted by a piston rod and rotated thereby for breaking the bond between the pipe sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.