Preventing buckling in drill string
US4384483A · kind A · utility
32Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1981 |
| Grant date | May 24, 1983 |
| Priority date | — |
| Expiry date | Aug 11, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In the drilling of a well, buckling of a drill string is prevented by determining the buoyed weight, sliding friction, and external forces applied to the segments of a drill string and comparing the resultant axial force on each segment with a buckling threshold to indicate when the resultant axial force exceeds the threshold. The azimuth and inclination of segments of the drill string are measured. The forces on the drill string are resolved into the axial and normal components applied to the next shallower segment. From these, the forces applied to each segment are determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.