Problems with dynamically simulating the three-phase separator at the wellhead using HYSYS

Thread Content

When using this dynamic simulation for the first time, after entering the boundary pressure conditions, holdup, and Cv values and setting the integrator, it was found that HYSYS changes according to its own random simulation inputs, even to the point where the material composition changes. It differs greatly from the parameters and outputs originally intended for simulation. Problems the client wants to solve: 1. Keep the components unchanged, specify the range and step size for pressure and temperature changes; it seems that HYSYS does not have an input window for this, so does one have to design it using the event scheduler? 2. Where does the critical flow velocity occur in the process? Are hydrates forming at the throttle valve? How to retrieve these results? 3. After specifying the Cv value, how can the optimal PID parameters be obtained through simulation? Do these parameters have practical engineering significance? Is there any expert in this forum who can answer my questions? Not very grateful. Additionally, control of the oil-water interface was not achieved (the weir in the software seems to be not designed for the structure of oil field three-phase separators); two phases were used instead of three.