Low-frequency drillbit seismic while drilling (Jul-2009) ///

An otherwise high-frequency sparker source can be incorporated into a drillbit for seismic while drilling to generate selectable low frequencies (< 40 Hz) for various seismic applications. The low-frequency source, capable of creating selectable mid-band frequencies of 1–20 Hz, enables real-time imaging in deep (over 15,000 ft), high-temperature (150°C), high-pressure wells for geosteering, accurate seismic hole depth, accurate pore pressure determinations ahead of the bit, near-wellbore diagnostics with a downhole receiver and wired drill pipe, and reservoir model verification.

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