Establishment method for deviation factor prediction model of deep high-temperature and high-pressure natural gas

The invention discloses a method for establishing a deviation factor prediction model for deep high-temperature and high-pressure natural gas, and relates to the technical field of oil-gas field development. According to the method, on the basis of actual gas reservoir Z factor experimental data, deviation factors Z under set formation temperature conditions and different pressure conditions are obtained through calculation according to an existing method; fitting and error results of all the methods are analyzed and compared, a proper quadratic parabola mathematical model with the critical pressure and the critical temperature as independent variables is selected, and a prediction model for the Z factor of the special gas reservoir is obtained through proper experimental fitting steps. Through a large amount of experimental simulation and field practical application, the method has high feasibility and accuracy, the problem of high error of the existing deviation factor calculation method in the aspect of de