Drill pipe
US4949797A · kind A · utility
14Cited by
14References
16Claims
0Family size
Inventor
Key dates
| Filing date | Aug 24, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Aug 24, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/22
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved drill pipe assembly wherein each pipe section is formed as a concentric walled pipe having both an axial and an annular space therethrough, and the pipe section includes means for communicating the adjoining annular spaces through the series of respective box end/pin end joints whereby equipment compartmentation, conductor traverse, ballast containment, gas pressurization and weight addition can be effectively utilized in controlled manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.