PathFinder Energy has announced that the iFinder Density Imaging Service, which produces borehole images of bulk density, photoelectric index and ultrasonic standoff, has been successfully tested and commercially deployed.
The primary measurement of the iFinder Service is bulk density imaging. Bulk density images are a graphical representation of the variation of bulk density around the circumference of the borehole. Imaging of this measurement is possible due to the collimated source and detectors of the density tool, which focus the density measurement on the formation directly in front of the sensor. As the tool rotates, data is collected around the entire circumference of the borehole.
PathFinder’s best in industry bulk density measurement uses a patented stand-off weighting technique to select a sub-set of the rotating data with minimum stand-off. Similarly, our patented imaging algorithm employs a weighting technique to focus the density measurement on discreet azimuths, or sectors, around the borehole. Since the algorithm does not “bin” data, there is no technical limit to the number of azimuths that can be imaged; however, the practical limit derived from the azimuthal resolution of the detectors is 32 sectors for memory images, while images of up to 16 sectors can be transmitted up-hole in realtime.
Density images are mainly used for geosteering because of the ability to determine the direction from which a particular bed is entered or exited. Stand-off or caliper images become very important in geomechanics and wellbore stability analysis, while the borehole image of the photoelectric index may provide useful additional geological information.
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