SOFTWARE SPECIFICATIONS

Software uses as input the thickness and weight per foot of a drill collar and produces a drill collar correction factor as an output. Included in this software will be a default drill collar density that will be used if weight per foot is not used. At present, the plan is to use 7.81 g/cc as the default collar density, which is the density of 17-4PH stainless steel.
Software uses as input the borehole size, the eccentering of the tool, the collar inner and outer diameters, and the KCl concentration of the mud to obtain the count rate due to mud as an output. This count rate will be subtracted from the total count rate.
Software uses as input the borehole size, the eccentering of the tool, the collar inner and outer diameters, and the mud weight and type to obtain a correction factor for borehole absorption as an output...
Software utilizes the calibration factor and the software listed above to obtain the following three curves:

a calibrated probe API value. This curve includes no correction for the collar or borehole fluid. The log given by this curve will be the log obtained by a probe run in a 5” borehole eccentered against the borehole wall.
a calibrated collar corrected API value. This curve includes all calibrations for both the probe and the collar thickness, but does not include environmental corrections. It is the log given in 4a corrected for the absorption of gamma rays in the drill collar. It does not include the effect of standoff induced by the collar, since this is dependent on other environmental effects.
a calibrated and environmental corrected API value. This curve includes all calibration and correction factors. This log will accurately represent the API value of the formation that is logged.

The software will provide accurate corrections in boreholes ranging from 3.5”-20”, with collar outer diameters ranging from 3.5” to 9”, and collar wall thicknesses of 0.50”-3.0”. It will run in light muds with densities ranging from 0 lb/gal to 13 lb/gal (0-1.56 g/cc); barite muds ranging from 8.34 lb/gal to 18 lb/gal (1-2.16 g/cc), and hematite muds ranging from 8.34 lb/gal to 20 lb/gal (1-2.4 g/cc).