Stand-off device
US6439304B2 · kind B2 · utility
12Cited by
2References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 23, 2001 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | May 23, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1042
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A stand-off device for tubulars comprising a sleeve adapted to fit around a tubular, the sleeve comprising an outer surface and a plurality of blades extending along the outer surface of the sleeve, the blades comprising a bearing surface, wherein the bearing surface of each blade is curved longitudinally. The device may be metallic or non-metallic. Non-metallic devices further comprise a protective coating to inhibit abrasion, corrosion, sparking, and electrolysis. The stand-off device is particularly suitable for use with casing in deviated wellbores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.