Method and tool for logging-while-drilling

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids

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367 84, 340861, 175 40, H04H 900, G01V 100

Patent

active

047348925

ABSTRACT:
A logging-while-drilling tool includes a housing positioned in a drill string, a shaft journaled in the housing, a turbine stage or stages, a rotor or rotors, the latter mounted on the shaft outside of the housing and driven by the drilling fluid and a braking device for variably controlling the rotational speed of the rotor in order to produce pressure pulses which are transmitted to the surface through the drilling fluid. A generator or other energy storing device is provided to power an electronic package which interprets downhole conditions for transmission of the same as pressure pulses.

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patent: 3964556 (1976-06-01), Gearhart et al.
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patent: 4184545 (1980-01-01), Claycomb

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