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Robertson Geo's High Resolution Optical Televiewer (Hi-OPTV) provides a continuous very high resolution oriented image of the borehole walls using a conventional light source. A unique optical system based on a fisheye lens allows the probe to survey 360 degrees simultaneously. This information is processed in real time to produce a complete 'unwrapped' ... Moreimage of the borehole oriented to magnetic north. The probe offers superior resolution to the High Resolution Acoustic Televiewer (HRAT) and produces images in real colour. While, unlike the HRAT, it can operate in air-filled boreholes, it is unsuitable for boreholes containing mud or cloudy fluids.

WellCad™ Image-Processing Software
WellCad™ is a Windows-based package for processing, interpreting and displaying acoustic and optical televiewer image logs. Standard log presentations include tadpole and stick plots, stereographic projections of poles to planes and azimuth frequency diagrams. The synthetic core display allows convenient comparison of log and field data for orientation of fractured or incomplete core sections.
Robertson Geo's Density Guardlog probe uses dual shielded detectors to provide a borehole compensated density measurement with good bed-boundary resolution, similar to the Formation Density probe. The Density Guardlog probe offers an additional LL3 focussed electrical measurement with good vertical resolution and depth of investigation.... More

Principle of Measurement
The Density Guardlog probe contains a detachable 137Cs gamma source and two scintillation gamma detectors. The active windows of the source and detectors are maintained in contact with the borehole wall by a motorised caliper arm. Gamma radiation back-scattered by the formation (Compton effect) reaches the detectors where the relative count rates provide a measure of formation density.
Robertson Geo's Formation Density probe uses dual shielded detectors to provide a boreholecompensated density measurement with good bed-boundary resolution. Principle of Measurement The probes contain a detachable 137Cs gamma source and two scintillation gamma detectors. The active windows of the source... More
and detectors are maintained in contact with the borehole wall by a motorised caliper arm. Gamma radiation back-scattered by the
formation (Compton effect) reaches the detectors where the relative count rates provide a measure of formation density.
Robertson Geo's High Resolution Acoustic Televiewer (HRAT) provides a continuous high-resolution, oriented ultrasound image of the borehole wall. The probe uses a fixed acoustic transducer and a rotating acoustic mirror to scan the borehole walls with a focussed ultrasound beam. The amplitude and travel time of the reflected acoustic signal are recorded ... Moreas separate image logs.

Features such as fractures reduce the reflected amplitude and appear as dark sinusoidal traces on the log. The travel time log is equivalent to a 360°-arm caliper and shows diameter changes within open fractures and 'break-outs'.

Directional information is also recorded and used to orient the images in real time.
Robertson Geo's Natural Gamma Probes - Triple Gamma & Ultra-Slim Gamma Probes - measure the activities of naturally occurring or man-made isotopes. Principle of Measurement The probes are based on scintillation gamma detectors which measure the natural gamma radiation released from potassium and the decay products of uranium and thorium in the ... Moreborehole.
Robertson Geo's PS Logger Probe is a low-frequency acoustic sonde designed to measure compressional (P) and shear-wave (S) velocities in soils and soft rock formations. It operates using indirect excitation rather than mode conversion as in a conventional sonic. It is capable of acquiring high resolution P and S wave data in borehole depths of up to ... More600m in water.

The PS Logger probe contains a unique design of powerful hammer source and two receivers, separated by acoustic damping tubes. To acquire data, the probe is stopped at the required depth and the source is fired under surface command. Firing causes a solenoid-operated shuttle aligned across the borehole axis to strike plates on opposite sides of the probe in turn, setting up a pressure doublet in the surrounding fluid. The resultant fluid motion produces a tube wave at the borehole wall with velocity close to the shear velocity of the formation together with a compressional wave.

As the waves propagate parallel to the borehole axis, they set up corresponding fluid movements that are detected by the two neutral buoyancy 3D hydrophone receivers and geophones, allowing the wave velocity to be determined. The facility to stack multiple shots and filter the data as in normal seismic data acquisition is included in the operating software.