Process Simulation Study Of Gas Condensate Multiphase Mixed

Offshore platforms will produce condensate in the running for some time, but a platform during the construction period did not consider how to send condensate out of the platform. After an investigation, mixing oil with gas to transport is the most convenient, economical and effective way to solve the problem about transportation of condensate oil. This paper researches operating parameters of multiphase pipeline after mixing gas and oil, then gives suggestion on setting the parameters of the pipeline.Multiphase flow theory is the basis of the further study.By investigation, this paper discusses the methods of properties parameters, liquid holdup, pressure drop, temperature drop calculation. Based on theoretical research and simple simulation this study did a further discussion of applicability of the Begs-Brill formula and found that the formula used to calculate holdup of multiphase pipeline in the large diameter or lower fluid flow conditions need to be cautious.According to the literature and field, primary seven two-phase pressure drop models, including two new simplified models were selected in this paper, on the basis of the energy equation, the model of the temperature drop was drived. A combination of these theories and models, software applied for gas mixing condensate pipeline operating parameters calculation is compiled by using Visual Basic.By the self-developed software, a steady-state simulation for a real submarine pipeline is performed. Comparing Thecalculations of7pressure drop model and the temperature drop model with field data, the results get a good fit. Calculation and comparing results show that the deduced temperature drop model has good accuracy and stability,can be used for simulating temperature drop in multiphase pipeline. According to the comparison results, the recommendation on calculation model which applied to the process parameters of the pipeline is put forward in this study.Chosen SRK&API properties parameters calculation method, CW-BBME pressure drop model and temperature drop model to run steady-state simulation for subsea pipeline in three different operation conditions. Through analysis on simulation results, the relation between pipeline pressure drop, temperature drop, liquid holdup and pipe length, it is found that the pipeline run steadily.The relationship between the percentage of heavy hydrocarbon, gas liquid ratio, inlet temperature and pressure drop is discussed in this study.Using OLGA software to run transient simulation for subsea pipeline in three different operation conditions, it is found that the severe slugging does not occur in pipeline export in these working conditions, so there is no need to optimize or modify slug trap in the end of the pipeline. In addition, the simulation results show the accumulation of liquid fluid in the pipeline is stable.Through plenty of simulation, it is obtained that limited conditions of slug flow occurring as well as the influence of the percentage of heavy hydrocarbon and inlet temperature on slug flow.