中国·永利y23455(股份)有限公司

Focussed Electric (Guardlog) Probe

The focussed resistivity (LL3) measurement provides excellent vertical resolution and a reasonable depth of investigation.

The Guardlog replaces the classic Electric Log in conditions of low mud resistivity and high formation resistivity

Principle of Measurement: 

The probe includes a central current-source electrode between two guard electrodes, maintained at the same potential by internal electronics. Current from the centre electrode is constrained to a thin disk by the presence of the guards and returns to the cable armour above a 10m insulated section. The potential of the central electrode with respect to a surface voltage-reference stake and the measured current are combined by a down-hole microprocessor to calculate apparent formation resistivity.

For detailed specifications, please contact EPC!