Densities of SrCl2(aq), Na2SO4(aq), NaHCO3(aq), and Two Synthetic Reservoir Brines at Temperatures between (298 and 473) K, Pressures up to 68.5 MPa, and Molalities up to 3 mol·kg–1

Abstract

We report the densities of SrCl2(aq), Na2SO4(aq), NaHCO3(aq), and the synthetic reservoir brine system [x1NaCl + x2KCl + x3MgCl2 + x4CaCl2 + x5SrCl2 + x6Na2SO4 + x7NaHCO3](aq), where x denotes the mole fraction of the different salts, at temperatures between (298 and 473) K and pressures up to 68.5 MPa. The molalities at which the single-salt solutions were studied are (1.022, 2.024, and 3.031) mol·kg–1 for SrCl2(aq), (0.783 and 1.502) mol·kg–1 for Na2SO4(aq), and (0.507 and 1.000) mol·kg–1 for NaHCO3(aq). The compositions of the synthetic reservoir brines studied are, first, x1 = 0.770, x2 = 0.022, x3 = 0.040, x4 = 0.105, x5 = 0.002, x6 = 0.044, and x7 = 0.018 with molality 0.359 mol·kg–1 and, second, x1 = 0.797, x2 = 0.006, x3 = 0.042, x4 = 0.145, x5 = 0.002, x6 = 0.006, and x7 = 0.002 with molality 1.900 mol·kg–1. The measurements were performed with a vibrating-tube densimeter calibrated under vacuum and with pure water over the full ranges of pressure and temperature investigated. An analysis of unce...