| 摘要 |
Devices and methods for incorporating a gap sub assembly into a drill string to electrically isolate portions of a transmitter assembly within, for example, an MWD tool located within the drill string. The gap sub assembly incorporates upper (34) and lower (36) subs having an insulated interconnection. A central conductor assembly (40) is axially disposed withi n the lower sub and does not extend through the length of the gap sub. The central conductor assembly is used to transmit electrical power and data across the gap sub assembly between the upper portions of the drill strings and transmitter components housed within the MWD tool disposed below the gap sub assembly.
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