Procedure for Natural Gas Compressibility Factor Determination

Abstract

The article is devoted to the development of an experimental stand and a methodology for experimental determination of the gas compressibility factors, to ensure the possibility of obtaining reliable information about the values of natural gas compressibility factor within the temperature range 223 - 250 K. An overview of empirical assessment methods of the compressibility factor values of gas media and approaches used to organize the hardware design of experimental studies is given. The method of compressibility factor determination is proposed and the description of the developed experimental stand is given. The error of the proposed method was assessed by testing in media with known compressibility factors in a wide range of temperatures and pressures: air, nitrogen, argon, methane. The test results are presented in the form of experimentally obtained data deviations from the compressibility factor values published in literature. The air compressibility factor uncertain values obtained as a result of the study are in the range (-0.02 -0.07%), for nitrogen - (-0.06 - 0.02%), for argon - (- 0.04 - 0.04%), for methane - (-0.08 - 0.06%). The obtained empirical values are taken satisfactory with the information given in literary sources. The good agreement of the experimental and design data obtained for pure gases and air shows that the developed method of compressibility factor experimental determination is reliable, has the required accuracy and can be used to determine the natural gas compressibility factor of various component composition.