Schlumberger Technology Corporation

Sofiane Ellouz

Emmanuel Legendre

Alexandre Abellan

Henri Budan

The present disclosure introduces an apparatus for downhole measurement of a formation resistivity. The apparatus includes a probe having a button electrode, a first guard electrode insulated from the button electrode, a second guard electrode insulated from the first guard electrode, and a return electrode positioned external to the second guard electrode. The apparatus also includes an electrical source for setting a voltage drop between the second guard electrode and the return electrode, a first impedance (R) electrically coupled between the button electrode and the second guard electrode, and a second impedance (R) electrically coupled between the first guard electrode and the second guard electrode.

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Clamart, France

Sofiane Ellouz