Stabilizer sleeve for drill string
US4823891A · kind A · utility
9Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Aug 27, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill string stabilizer includes a cylindrical sleeve 11 coaxially surrounding a central tubular element 10 and fixed thereto by a plurality of helical blades 17 extending between the facing surfaces of the sleeve and the element. Converging truncated cones 13, 16 are provided on both ends of the sleeve. The upwardly flowing drilling mud establishes an annular fluid bearing between the sleeve and the borehole, while the helical blades implement a pumping function to enhance the discharge of the mud and cuttings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.