| 摘要 |
The disclosure relates to measurement of the rate of advance of a drill bit from a floating drilling installation. The process includes joining a point of the drilling system, fixed in translation with the movement of the drill string, at the lower extremity of which is a drill bit, to a fixed point solid with the ground, by a cable of constant length passing through a pulley system fixed to the floating drilling installation, to measure the angular displacements of different pulleys of the pulley system and to derive from them magnitudes representing the rate of advance of the drill bit. This procedure, applied to a floating drilling system, eliminates the effect of vertical movements, that is swells or waves, from the measurements.
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