High-power well logging method and apparatus
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United States of America Patent
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Jul 5, 2005
Grant Date -
May 8, 2003
app pub date -
Aug 30, 2002
filing date -
Dec 2, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system and method for downhole power delivery. In one embodiment, the system delivers computer-regulated downhole power voltages, and may be configured to customize signal waveforms and power allocation on the various independent signal transmission modes to maximize the power capacity of the logging cable subject to its maximum voltage rating. In one embodiment, the system includes a standard multiconductor logging cable which supports orthogonal signal transmission modes on circumferentially spaced insulated conductors. A high-power power source on the surface is coupled to the insulated conductors in the cable to drive a power signal on the lowest impedance signal transmission mode. The system may further include multiple power sources operating on different independent signal transmission modes, and may also include multiple telemetry channels which share the power transmission modes via frequency multiplexing.
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