Toroidal coupled telemetry apparatus
US4525715A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 1984 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | Jan 18, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A logging telemetering system comprising a toroidal coupled telemetry apparatus including a primary winding carrying bore hole data, wrapped around at last one torroid core mounted within a drill collar. The toroid core is further wrapped with at least one secondary turn which is connected to the drill collar for enhancing the efficiency of inducing a current carrying the borehole data in the drill string for transmission to the surface. One half turn of the secondary winding is provided by an insulated portion of the drill collar, and the balance of the secondary winding is composed of an electrically conductive strap wound around the toroid core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.