GUIP38: Focused Electric

The defining element of the GUIP38 probe, 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.

As well as providing high-resolution and full-range focussed resistivity measurements, an onboard processor calculates formation conductivity (in mmho/m) and capacitance (µF) values.

Due to focussing of the injection current, this method allows a resolution of thinner layers compared to a log of the traditional “normal” type. The other advantage of this method lies in the fact that it is suitable for difficult hole conditions (salt mud). This type of log is most often used for formation evaluation (lithology / porosity) and groundwater quality studies.

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GUIP38 SPECIFICATIONS

Technical Specifications

 Diameter : 38 mm

Length : 2500 mm

Max. Temp : 70°C

Pressure : 200 bar

Sensors Parameters

Resistivity Resolution : 0.125 ohm.m(8kohm.m full scale measurement range)

0.5 ohm.m(32kohm.mfullscale measurement range)

Conductivity resolution : 0.03125mmho/m(2 kmmho/m measurement range)

Capacitance resolution : 1nF/m (65μF/m measurement range)

Options And Accessories

Gamma ray sensor: ø25 x 50 mm NaI(Tl) crystal

Transport case

GUIP38 GALLERY

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Lim designs, produces and commercializes measuring instruments and solutions dedicated to drilling.

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