Experimental densities and enthalpies for water - natural gas systems

Typescript (photocopy).A Burnett apparatus was used to obtain accurate P-(rho)-T data of water - natural gas systems over a pressure range of 5 to 2450 psia. Experimental data were obtained for three wet, sweet natural gas mixtures containing 1.85%, 5.0%, and 10.0%, water over a temperature range of 50(DEGREES) to 210(DEGREES)C. In addition, data were procured for three water and sour natural gas combinations of 0.0%, 5.5%, and 10.0% water over a temperature range of 50(DEGREES)C to 200(DEGREES)C. The Burnett-isochoric technique was used to minimize any adsorption errors. This technique enabled the coverage of an entire P((rho),T) surface with a single sample. The Burnett-isochoric method also provided a means for the accurate calculation of the thermophysical properties, such as enthalpies, densities, and compressibility factors, of the water - natural gas systems. The addition of small amounts of water to the natural gases provided mixtures that are near perfect over the pressure range of zero to 2450 psia. The compressibility factors range from 0.965 to 1.000. The Burnett-isochoric technique provided a means of the determination of the dew-point loci of the five wet, natural gas mixtures. Measurement of the abrupt change of the isochoric slope, ((PAR-DIFF) P/(PAR-DIFF) T)(,(rho)), at the boundary between the single-phase gas and the two-phase region supplied grid points of the dew-point loci. The dew-point loci of the wet, sweet natural gas mixtures generally agreed with a priori methods except at low pressures. The dew-point loci of the wet, sour natural gas mixtures provided higher dew-point pressures than the prediction methods, primarily due to lack of previously available precise experimental data