Vale S.a.

Dionisio Uendro Carlos

Wanderson Roberto Pereira

Marco Antônio Da Silva Braga

Henry Francisco Galbiatti

Marco Antonio Braga

A method for quality control of gamma-gamma well logging data within a borehole for mineral exploration, including receiving, at a computing device, raw well logging data; identifying and formatting data sets from the raw well logging data; applying at least one quality control process to the formatted data sets, the at least one quality control process being selected from: a linear verification process comparing linearity of density data readings between a long and a short spaced sensor in a probe; a density range verification process comparing density readings at the probe with density ranges for the borehole lithology; a diameter comparison process comparing actual diameter of the borehole at a depth with density readings at the depth; and a residual verification process for verifying a proportionality between densities measured by the long spaced sensor and short spaced sensor; compiling the results and providing an output of the compiled results.

Method and system for quality control in gamma-gamma data during mineral exploration

A method and system for estimating density of material surrounding a borehole in mineral exploration, the method including inserting a tool into a drilling rod located within a borehole, the tool having a gamma radiation source and at least one sensor; raising the tool within the drilling rod; receiving gamma count readings at the at least one sensor; sending the gamma count readings to a computing device; and removing effects of the drilling rod from the gamma count readings at the computing device to calculate a density of material surrounding the borehole.

Method and system for density correction for geophysical well logging inside drilling rods

A calibration site for a gamma-gamma well logging tool for use in mineral exploration, the calibration site having a column consisting of a plurality of blocks of known densities; and a borehole through the column configured to accept the gamma-gamma well logging tool. Further, a method for calibrating a gamma-gamma well logging tool at the calibration site, the method including lowering the gamma-gamma well logging tool into a column consisting of a plurality of blocks of different known densities and having a borehole therein to receive the gamma-gamma well logging tool; raising the gamma-gamma well logging tool at a set rate; capturing a radiation count at a sensor of the gamma-gamma well logging tool; converting the radiation count to a recorded density for a particular depth at a computing device; and comparing the recorded density at each position of the column with the known densities.

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Belo Horizonte, Brazil

Dionisio Uendro Carlos