Method and system for predicting the appearance of a dysfunctioning during drilling
US5721376A · kind A · utility
42Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1996 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Apr 1, 2016 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/007
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a method and to a system suited for monitoring the behaviour of a drill bit (2), the damping associated with a natural mode of the torsional oscillations measured by at least one measuring device (4) placed in the drill string is determined. The appearance of a stick-slip type dysfunctioning is predicted when the damping value decreases significantly as a function of time, and drilling parameters are then varied in order to avoid the appearance of the dysfunctioning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.