Products

Borehole Logging Systems

Induction Conductivity

H3I-453
H4I-453
HI-381
HI-453, HI-453E
HI-453F
HI-456
HII-383
HII-453

Magnetic Susceptibility

HM-453, HM-383, HM-320
HM-453E, HM-383E
HM-100
HMM-453
HMG-453

Combined probes

HMI-453, HMI-453E
HRTIG-453

Other probes

BWS-50
HC-380
HC-380C
HC-453, HC-453a
HC-454
HRT-381
HF-380
HGSPR-380
HF-500
HN-453
HFN-381
HGG-453
HDG-453
HLG-382
HR-380 Glu
HR-380 P
HV-380 & HV-450

Other products

BLC-150, BLC-300
BLC-300/600
BHC-200
Geo set HDS-600
Portable Winches
Portable Logging System
Cameras

Accessories

AH-30, AH-150

Logging instruments

Potential HR-380 P

The HR-380 P Potential probe measures specific resistance of surrounding rocks which, after the data evaluation, helps to determine the lithological boundary of permeable layers in a borehole or to follow structures of coal seams.

The Potential probe has the distance between unpaired electrodes smaller than the distance from the paired electrodes M - A0, A1.

Difference between the potential and gradient resistivity measurements are in shapes of resulting curves. The curve measured by a potential probe is symmetric in the point of maximal anomaly.

If the thickness of a layer is smaller than the length of the probe, the resulting curve shows minimal value.

Depth of investigation is given by the length of the probe: L = A to M.

A gradient probe (HR-380 Glu) is better at detecting of underlying or overlying boundaries of rocks. The shape of its resulting curve is non symmetrical. Length of the probe L = A to 0 gives N the depth of investigation.

The measured values of Rap and Rag are affected by the borehole diameter and by the specific resistivity of the mud cake.

Potential HR-380 P

Probe Parameters

Available in diameters 38 mm and 45 mm
Length 2000 mm
Weight 5,0 kg
Max. Working Pressure / Temperature 10 MPa / 75 °C
Power Supply 45 Vdc @ 120 mA

Excitation frequency is 8 Hz; Operated on one conductor cable.
Output pulses of amplitudes/widths 8V / 6 µs (values are adjustable).

Measurement

The shorter channel (0,10 m) is active during winching the probe down. After reversing the direction of movement the other electrode (0,4 m channel) is activated.

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