Fluid drilling head
US7083011B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 2002 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Nov 14, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/18
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A fluid drilling head has a plurality of nozzles (3, 4, 5, 6) in a rotatable nozzle assembly (2) to provide high pressure cutting jets (7). The head is provided with a gauging ring (10) having an annular clearance (11) to the rotatable nozzle assembly (2) to provide for the passage of rock particles eroded by the cutting action of the jets (7) while regulating the progress of the drilling head in the borehole and controlling drill stalling. A stepped rotatable nozzle assembly having a smaller diameter portion (8) and a larger diameter portion (9) to extend the cutting zone of a reaming jet closer to the outer diameter of the gauging ring (10) is also described and claimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.