Dual rod drill pipe with improved flow path method and apparatus
US7694753B2 · kind B2 · utility
23Cited by
6References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 24, 2007 |
| Grant date | Apr 13, 2010 |
| Priority date | — |
| Expiry date | Mar 1, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/103
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill rod assembly including inner and outer drill rods. The drill rod assembly further including flow passages that are in fluid communication with an annular fluid flow path defined between the inner and outer drill rods. The passages preventing blockage of a drill string fluid flow path when a number of drill rod assemblies are interconnected to form a drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.