Electrical surface activated downhole circulating sub
US6543532B2 · kind B2 · utility
15Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2001 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Jul 2, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/066
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A preferred novel circulating sub includes an electric motor, hydraulic intensifier, connecting rod, valve sleeve, valve plug, and angled nozzles. Upon activation of the circulating sub the electric motor drives the valve sleeve over the valve plug, causing a flow of drilling fluid to exit the angled nozzles. Upon deactivation of the circulating sub, the electric motor removes the valve sleeve from the valve plug, allowing the flow of drilling fluid to once again flow to the drill bit. Because the electric motor is reversible, the circulating sub can be repeatedly activated and deactivated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.