Dual rod directional drilling system
US11808151B2 · kind B2 · utility
1Cited by
36References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2021 |
| Grant date | Nov 7, 2023 |
| Priority date | — |
| Expiry date | Apr 19, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A flow collar for use on a dual rod drill rod assembly includes an uphole end defined in part by a first interior portion having a first interior diameter and a downhole end defined in part by a second interior portion having a second interior diameter that is larger than the first interior diameter. The flow collar further includes a plurality of radially-extending peripheral fluid passages extending through the flow collar to the second interior portion. An outer rod interfacing surface defines a continuous annular surface with a constant outer diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.