ارائه يك رابطه تجربي براي محاسبه ضريب تراكم پذيري

A New Proposed Correlation for Calculating Compressibility Factor and Comparison of That with Other Correlations

Compressibility factor (z-factor) values of natural gases are necessary in most petroleum engineering calculations. Necessity arises when there are no available experimental data for the required composition, pressure and temperature conditions. One of the most common methods of calculating z-factor values is empirical correlation. Firstly, a new correlation based on the famous Standing-Katz (S-K) Chart is presented to predict z-factor values. The advantage of this correlation is that it is explicit in Z and thus does not require an iterative solution as is required by other methods, so it can be utilized at PLC (Programmable Logic Controller) system simply. Secondly, the comparison between new one and other correlations is carried out and the results indicate the superiority of the new correlation over the other correlations used to calculate z-factor.