Stress relief groove for drill pipe
US5286069A · kind A · utility
16Cited by
9References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Dec 3, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/042
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The fatigue life of the tube section of a joint of drill pipe is increased by locating a stress relief groove in the weld necks of the tool joints adjacent the welds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.