Steerable rotary drilling device
US6415878B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2001 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Nov 28, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a drilling apparatus of the type comprising a housing, a proximal seal, a distal seal, a fluid chamber defined by an interior of the housing between the proximal seal and the distal seal, the fluid chamber containing a lubricating fluid having a fluid chamber pressure, a pressure compensation system for compensating for the effects of an ambient pressure exerted on an exterior of the apparatus. The pressure compensation system includes a pressure port in the housing so that the ambient pressure can be communicated to the fluid chamber and a supplementary pressure source for exerting a supplementary pressure on the lubricating fluid contained in the fluid chamber so that the fluid chamber pressure is maintained higher than the ambient pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.