Method and apparatus for logging inclined earth boreholes...

Details Method and apparatus for logging inclined earth boreholes... Method and apparatus for logging inclined earth boreholes...

E - Fixed Constructions

21

B

73/168

E21B 47/00 (2006.01) E21B 47/12 (2006.01)

Patent

CA 1109292

ABSTRACT OF THE DISCLOSURE A method and apparatus for use in logging inclined earth boreholes is disclosed, The well logging instrument is connected to one end of a well logging cable, the other end of which is connected to a rotatable hoist drum at the earth's surface. The cable is wound on the drum which in turn controls the pay out of the cable as the instrument traverses the bore- hole. The instrument carries an accelerometer and circuitry to convert instrument acceleration into an indication of instrument velocity, The velocity of the well logging cable at the earth's surface is determined and that velocity is compared with the indicated velocity of the instrument in the borehole. The resulting comparison signal is used to control rotation of the hoist drum and hence the pay out of the cable so as to avoid the risk of overrunning the well logging instrument with too much cable.

364076

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