With the GUIP 38 tool, the use of a pair of equipotential «guard»
electrodes ensures a reliable formation resistivity measurement by
focussing the injected current in a way that maximises vertical
resolution and penetration into the formations while avoiding
dissipation in the borehole fluid. An onboard processor calculates
formation conductivity and capacitance values.
Due to focussing of the injection current, this method allows a
resolution of thinner layers compared to a measure of the normal type.
The other advantage of this method lies in the fact that it is suitable for
difficult hole conditions (salt mud).
A natural gamma detector incorporated into the tool provides
lithological information and is useful for correlation purposes.
Applications include formation porosity and water quality evaluation.
LIM is a leader company specialised in instrumentations during and after drilling