Convertible tubular scraper
US6851472B2 · kind B2 · utility
10Cited by
17References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2003 |
| Grant date | Feb 8, 2005 |
| Priority date | — |
| Expiry date | Apr 7, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B37/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tubular scraper which can be assembled so that the blades will be either rotating or non-rotating, as desired. If the tubular scraper is assembled in the non-rotating configuration, and the blades becomes stuck in the casing, the drill string can be pulled upward to engage a clutch. Once the clutch is engaged, the scraper is converted to a rotating scraper, so that the drill string can be rotated to assist in dislodging the stuck scraper blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.