| Summary: | Results of an interlaboratory experiment, lying in determining the accuracy (trueness and precision) of rock porosity measurements with a helium porosimeter, are presented in the paper, taking into account foundations of metrology, theory of uncertainty and measurement errors. The experiments were carried out in three different petrophysical laboratories related with oil mining in a different span of time. The research material was composed of 20 rock samples of varying porosity coefficient, ranging from about 1 to about 23%.In the course of the analysis, the measurement accuracy was assessed in the conditions of repeatability and reconstructibility of experiments, taking into account interlaboratory and intralaboratory variability of the results.
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