Stabilizer for drillstems
US4664206A · kind A · utility
23Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1985 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Sep 23, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved stabilizer for use in stabilizing both drill collars and other sections on a drill string is disclosed. The stabilizer has at least three circumferentially spaced helical blades which have a tapered portion at each end and a cylindrical portion therebetween, each blade overlapping the adjacent blade within each tapered portion as well as within the cylindrical portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.