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.

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GRT38 specifications

  • Diameter : 38 mm
  • Length : 2500 mm
  • Max. Temp : 70°C
  • Pressure : 200 bar

  • 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)

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

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