Method and apparatus for maintaining electric cable inside drill pipe
US4098342A · kind A · utility
20Cited by
9References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1977 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | May 25, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/12
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An insulated electric conductor employed in a tubular drill string to transmit electric energy between subsurface and surface locations is arranged within the drill string in a convoluted configuration to provide an excess length of conductor. The convoluted conductor is prevented from entangling during drilling by rotation limiting assemblies mounted in the drill string over a selected interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.