At present the non-condensible gas can be chosen to be air, CO 2, CH 4, H 2, or N 2. The main assumptions made in developing this EOS module more » are discussed, together with the correlations employed to calculate the thermophysical properties of multiphase multicomponent mixtures. The dependence of density, viscosity, enthalpy, and vapor pressure of brine on salt concentration is taken into account, as well as the effects of salinity on gas solubility in the liquid phase and related heat of solution. It can describe liquid and gas phases, and includes precipitation and dissolution of solid salt. This EOS module is able to handle three-component mixtures of water, sodium chloride, and a non-condensible gas. « lessĪ new equation-of-state module has been developed for the TOUGH2 simulator, belonging to the MULKOM family of computer codes developed at LBL. The calculated wellhead conditions consist of temperature, pressure, vapor mass fraction, enthalpy and entropy of the two-phase mixture, liquid velocity and vapor and liquid mass flow rates for either pure water or brine. Wellbore parameters of casing inside diameter, Moody friction factor, gas/liquid velocity ratio and the overall heat transfer coefficient between the casing and ground must also be supplied. Reservoir values of temperature, depth, salinity, mass flow rate and drawdown pressure more » factor must be specified. An additional modification establishes the mass flow rate needed to just produce sonic liquid velocity at the wellhead (if the specified flow rate exceeds this value) in order to characterize the entire range of flow conditions for the well geometry and reservoir characteristics. The calculational model was developed by Elliott and has been modified to incorporate a more accurate analytical procedure for calculating brine thermophysical properties. AbstractNote = ,Ī computer program entitled ''WELLFLOW'' is presented for calculating wellhead flow and fluid conditions for a self-flowing geothermal well of constant diameter.
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