Isothermal PρT measurements on Qatar’s North Field type synthetic natural gas mixtures using a vibrating-tube densimeter

Pressure–density–temperature (PρT) measurements of five natural gas mixtures that represent Qatar’s North Field natural gas reservoirs were carried out at temperatures from (250 to 450) K and at pressures up to 65 MPa by using a Anton Paar® (Graz, Austria) vibrating tube densimeter DMA 512P high-pressure cell. Total 20 isotherms from 250 K by 10 K intervals up to 450 K were measured. Experimental density data were compared with two main industry standard equations of state (EOS) namely AGA8-DC92 EOS and GERG2008 EOS. Comparisons of the experimental data with respect to AGA8-DC92 EOS and GERG2008 EOS resulted in prediction deviation ranges of (0.05 to −0.5)% and (0.25 to −0.5)% respectively.

► Multi-component mixture density measurements via vibrating tube densimeter. ► Isothermal density measurements up to 65 MPa between (250 and 450) K on natural gas. ► AGA8-DC92 EOS and GERG2008 EOS were used for density predictions.