Application of OLGA in Natural Gas Transportation Process Modification
In the trial production stage of a certain condensate gas field,due to the small number of production wells and low production,natural gas pipeline transportation and crude oil truck transporta-tion are adopted in the early production stage to avoid crude oil solidification.With the increase in the number of production wells,the oil and gas production of the gas field has been increasing year by year,leading to an increase in the number of crude oil truck transportation times and a deterioration in the adaptability of the existing transportation processes.The adaptability analysis of the existing transpor-tation pipelines is carried out from the aspects of pipeline transmission pressure drop,temperature drop,gas-liquid flow rate,liquid holdup,and pigging volume for separate and mixed transportation by using OLGA software.The results show that the starting pressure of mixed transportation is higher than that of separate transportation for the same gas volume flow,and the temperature drop trend is ba-sically the same.When the gas volume flow is lower,the gas velocity of mixed transportation fluctuates greatly.When the gas volume flow is larger,the gas velocity is larger,the liquid-carrying capacity of gas is higher,and the liquid holdup and the pigging liquid volume are smaller.When the temperature at the end of pipeline transportation is greater than the freezing point of crude oil by more than 3℃,the existing natural gas transportation pipeline can be adjusted from a separate transportation process to a mixed transportation process,and a modification plan of the oil and gas treatment plant is proposed.
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