Alternative EoS-based model for predicting water content, metastable phases and hydrate formation in natural gas systems

摘要: Abstract Methods for determination of water content in natural gas are a very important asset the oil and industry. However, predicting can be challenging task some conditions. This is case when acid gases present mixtures or ice hydrate formation taken into account. In this work, we propose methodology based on modified cubic equations state (Peng-Robinson Soave-Redlich-Kwong) as an alternative greater accuracy than other standard approaches simpler SAFT more complex state. The modifications used three-parameter alpha function new binary interaction parameters. parameters were regressed from bubble point experimental data several compounds mixtures. Then, model was extrapolated to liquid water, calculations compared common methods prediction. performed successfully, despite presenting limitations. Finally, discuss role metastable phases formation. We studied phase equilibrium water + methane extract information about total absence free water. Results show that there critical mole fraction every mixture, above which hydrates will not form directly vapor phase. lower fractions, surface phenomena have account order fully understand