| 摘要 |
An apparatus for borehole electromagnetic telemetry is provided comprising a direct switching element to couple energy from a downhole energy source to the earth-drillstring system, a downhole energy source that may be adapted to a variety of voltage levels, a system to control the switching element in response to the desired information to be telemetered, a system to adapt the voltage level of the downhole energy source to the desired level for the conditions of usage, and an insulated joint so that the energy to be transmitted can be injected into the earth-drillstring system.
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