PHASE-EQUILIBRIUM CALCULATIONS FOR UNPROCESSED WELL STREAMS CONTAINING HYDRATE INHIBITORS

It is shown that the phase distribution of methanol and water between a hydrocarbon gas phase, a hydrocarbon liquid phase and an aqueous pha se can be represented using the Soave-Redlich-Kwong equation with a no n-conventional mixing rule for the a-parameter suggested by Huron and Vidal. Model parameters are estimated from data for binaries of the ty pe methanol-hydrocarbon and water-hydrocarbon. New experimental data a re presented for two reservoir fluids and for one model system. The pa per further presents a phase equilibrium algorithm for calculating the phase boundaries and the equilibrium compositions at the phase bounda ry for a system consisting of a gas, a liquid and a mixed aqueous phas e.