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THE INFLUENCE OF IMPROPER PREPARATION OF THE ROCK SAMPLE USED FOR HELIUM POROSIMETRY ON DETERMINANTION OF POROSITY COEFFICIENT
Abstract
Measurements of porosity of rock materials are one of the most important in field investigations and laboratory analyses of rocks and soils mechanics. Results of those laboratory measurement are used in vast majority of reservoir engineering calculations and simulations and that is the reason why, accurate measurement of porosity is of vital importance during laboratory tests. The main goal of this study was to investigate the influence of improper preparation of sample for the porosity laboratory measurements on evaluation of porosity coefficient. The analysis consisted in taking into account: inaccurate measurements of the sample (width, height, diameter) and also imprecise cutting, what leads to a situation where investigated sample does not perfectly fits to the laboratory apparatus. The most common methods of measuring porosity are: mercury and gas porosimetry. For the purpose of this study, authors used helium porosimetry method. As the investigation has proved, such inaccurate preparation might results in significant errors in subsequent calculations: geometrical volume of the sample and final porosity coefficient. Furthermore, even a small error at this stage of reservoir engineering calculations or simulation might lead to a significant inaccuracy in subsequent analysis of: geological reserves of the oil or gas field, values of permeability or productivity of a single well, that is why this topic is of vital importance during laboratory investigations.
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References6
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