Nozzle orientation for roller cone rock bit
US6354387B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2000 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Feb 1, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A tri-cone earth-boring bit has nozzles oriented for improved cone cleaning, bottom cleaning and cuttings evacuation. Each of the nozzles is oriented to discharge across a trailing side of a cone at a point considerably inboard of the borehole wall. Each nozzle has an outlet located radially outward from the bit axis a distance that is at least equal to a distance from a top dead center of the heel row of each of the cones to the bit axis. Also, each of the nozzles is oriented to discharge drilling fluid along a line that contacts the borehole bottom at a distance that is no greater than a distance from a bottom dead center of an outermost of the inner rows of the cone to the bit axis. A portion of the drilling fluid discharged from each nozzle will pass by more than one of the rows of the cones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.