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The present research aimed at characterization of the drill cuttings of an oil well belonging to the Santos Basin, using different instrumental analytical techniques. The main focus was given to the application of X-ray diffraction as an alternative to the routinely applied mud-logging study practices, where essentially visual classifications of the lithological units of the well are carried out and generally in fine granulation samples, giving uncertainties to the descriptions. A total of 164 samples of drill cuttings were chemically analyzed by X-ray fluorescence spectroscopy and classified according to their mineralogical similarities using the multivariate statistical analysis of X-ray diffraction data. This feature allowed minimizing the sample set for subsequent characterization studies. The identification and quantification mineral phases present in all samples, as well as the determination of the sizes and forms of the particles by dynamic images analysis, were carried out only in representative samples of each one of the defined groups of similarities. Results were compared with the data of the geological monitoring profile (drilling data) and the interpretations carried out in the mud-logging unit by geologist, and a high correlation between these data was identified. The viability of using a bench scale diffractometers during the drilling stage of an oil well was also studied considering the feasibility study on representative samples to be applied on site (adequate pulverization time and possible sampling errors) and quality of the results obtained by different X-ray diffraction equipment (collecting conditions and resolution of spikes). The use of bench diffractometers in the study of drill cutting proved to be feasible from the operational point of view, bringing several advantages for the correct characterization of the fragments, with better accuracy in the results, decrease of the uncertainties and a very agile tool.

Caracterização de cascalhos de perfuração de poços de petróleo por técnicas analíticas instrumentais.