Measuring drillstem loading and behavior
US4715451A · kind A · utility
121Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1986 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Sep 17, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/007
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drillstem loading and behavior measurement method and system includes spaced apart subs disposed at the upper end of the drillstem and connected to each other and to a power or conventional swivel and having strain gages and accelerometers mounted thereon in such a way as to measure axial loading, axial vibration, torsional loading, torsional vibration and bending modes of the drillstem during operation. Accelerometers are mounted on respective ones of the subs at a distance from each other sufficient to determine vibration waveforms in axial, torsional and bending modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.