Continuous borehole-logging method

Details Continuous borehole-logging method Continuous borehole-logging method

E - Fixed Constructions

21

B

255/1, 324/8

E21B 49/00 (2006.01) E21B 47/12 (2006.01)

Patent

CA 1143365

CONTINUOUS BOREHOLE-LOGGING METHOD Abstract of the Disclosure A method of continuosly logging a borehole being drilled with the use of a drilling mud is disclosed. According to the invention, the drilling mud being fed into the borehole is subjected to unipolar electric trea- tment, while measuring at the same time the value of its redox potential. This valu is maintained substantially constant at a given magnitude. Meanwhile, the value of the redox potential of the drilling mud returning from the borehole is continuously measured, and the value obtained by the measurement is compared with the given value of the redox potential of the drilling mud fed into the borehole. The difference between the two values is used to determine for a given moment the mineralogi- cal composition of the rock adjoining the bottom of the borehole, by comparing the abovementioned difference with the known in advance normal redox potentials of minerals. - 12 -

354033

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