Apparatus with capacitive electrodes for measuring...

G - Physics – 01 – V

Patent

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G01V 3/24 (2006.01)

Patent

CA 2346911

The invention concerns a electrical prospecting device in a borehole with capacitive electrodes comprising at least two injection electrodes (16, 20), at least two measuring electrodes (28, 34) and a current generator (22) for applying an electric current between the two injection electrodes. The current generator (22) delivers an alternating current whereof the frequency ranges from 5 kHz to 100 kHz under a voltage less than 1000 volts. At least one of the measuring or injection electrodes (16, 28) is arranged in a borehole (12, 14) and has an electricity conducting cylindrical outer surface. The device further comprises means (24) for measuring the intensity of the current passing through said injection electrodes, means for measuring the difference of potential between the two measuring electrodes (36, 36b), and means for processing the intensity measurements and the potential difference to deduce therefrom the characteristics of the subsurface where the borehole is located.

L'invention concerne un dispositif de prospection électrique en forage à électrodes capacitives comprenant au moins deux électrodes d'injection (16, 20), au moins deux électrodes de mesure (28, 34) et un générateur de courant (22) pour appliquer un courant électrique entre deux électrodes d'injection. Le générateur de courant (22) délivre un courant alternatif dont la fréquence est de 5 kHz à 100 kHz sous une tension inférieure à 1000 volts. Au moins une des électrodes de mesure ou d'injection (16, 28) est disposée dans un forage (12, 14) et présente une surface externe cylindrique et conductrice de l'électricité. Le dispositif comprend en outre des moyens (24) pour mesurer l'intensité du courant traversant lesdites électrodes d'injection, des moyens pour mesurer la différence de potentiel entre les électrodes de mesure (36, 36b), et des moyens pour traiter les mesures d'intensité et de différence de potentiel pour en déduire des caractéristiques du sous-sol dans lequel est situé le forage.

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