Initial gas full-component simulation experiment of Ban-876 underground gas storage

•The full-component is matching by using adjacent reservoir sample.•The heavy constituent is splitting and the saturation pressure is calculated.•The single flash, CCE and CVD experiments are carried out by using simulation method.•The mimicry components are merged which provide EOS parameters for simulation.

Numerical simulation can provide guidance to resolve injection production contradiction during the operation of underground gas storage, it is the key to ensure the smooth operation of underground gas storage. To perform accurate numerical simulation, accurate gas full-component analysis data is essential. In this study, the full-component experiment simulation of Ban-876 underground gas storage was done according to the laboratory experiment natural gas component analysis data. The saturation pressure calculation, phase diagram characteristics analysis, constant composition expansion experiment and constant volume depletion experiment were carried out with simulation methods. Finally, the full experimental data of initial condensate gas component was obtained which can provide reliable equation of state (EOS) parameters for the underground gas storage history matching and effect prediction.