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Diviation
The Borehole Deviation probe measures the direction relative to magnetic north, inclination and trajectory of the borehole. Measurements are based on the “Applied Physics Systems” 544 orientation sensor containing both a 3-axis fluxgate magnetometer and a 3-axis accelerometer.
Deviation parameters are calculated in real time and displayed as continuous logs during the measurement.
Fluid Temperature + Conductivity
The FTC probes provide borehole temperature and fluid conductivity measurements. The standard temperature log, based on a thermister, is designed to provide a measure of the ambient geothermal gradient and is helpful to detect anomalies caused by events such as fluid flow into the borehole.
The borehole fluid conductivity is directly proportional to the concentration of dissolved minerals. It is generally used in hydrogeology to determine the concentration of dissolved ions in the aquifers and to locate the fluid flows occurring in the borehole, especially if some time has passed and the temperature features have dissipated. It is important to differentiate between fluid inflow anomalies and formation conductivity anomalies identified on the temperature logs.
Spinner Flowmeter
The Spinner Flowmeter probe measures impeller rotation caused by groundwater flow in the borehole. It uses a magnetically coupled pick-up which drives a low friction, high resolution encoder located inside the lower pressure housing. The encoder produces 256 pulses per shaft rotation. It has quadrature sensing electronics that instantaneously detect flow direction changes.
