Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1994-05-26
1996-05-21
Carone, Michael J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 69, 175 45, G01V 140
Patent
active
055196683
ABSTRACT:
Methods for providing an image at the surface of a formation surrounding a borehole in real-time include associating resistivity measurements with a predetermined number of preselected toolface positions. The resistivity measurements are subjected to data compression and transmitted uphole by MWD telemetry. At the surface, the compressed resistivity measurements are associated with the preselected toolface positions and with a calculated translational distance value. The resistivity measurements are decompressed and/or converted to pixel information. The pixel information is arranged according to toolface position and translational distance to create a high resolution of the formation. These processes are repeated over time so that the image created represents the formation over a selected distance. Apparatus of the invention used to perform the methods include an MWD telemetry device, at least one downhole formation resistivity sensor, and downhole device(s) for determining the toolface of the resistivity sensor. Downhole processor(s) are provided for synchronizing, selecting and compressing resistivity measurements. On the surface, a translational distance sensor is provided along with processor(s) for associating, converting, and arranging. At the surface, the associated information is used to form an image of the formation spanning a number of translational distance values.
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Carone Michael J.
Gordon David P.
Kanak Wayne I.
Montgomery Christopher K.
Schlumberger Technology Corporation
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