Annular drilling device
US9540898B2 · kind B2 · utility
8Cited by
45References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 21, 2015 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | May 21, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/085
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An annular drilling device is provided that employs an active or passive, stationary sealing element. The sealing element is made of a low-friction material that contacts the drill pipe and creates a seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.