Insulated drill collar gap sub assembly for a toroidal coupled telemetry system
US4348672A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1981 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | Mar 4, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An insulated drill collar gap sub for a toroidal coupled telemetry system comprising a first annular sub member (100) operable to be connected at one end to a drill collar and a second annular sub member (104) operable to be connected at the other end to the drill collar. The first and second annular sub members have longitudinally extending interconnecting structural members (106, 118) operable to structurally interfere. The interconnecting structural members are dimensioned to form a continuous gap (116) between mutually opposing surfaces and a dielectric material (118) fills the gap to electrically isolate the first annular sub member (100) from the second annular sub member (108). A bearing member (124) is positioned between the first annular member and the second annular member but is insulated from at least one of said annular members to facilitate the formation of a drill collar of structural and electrical integrity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.