Application analysis of by pass pigging for gas-condensed pipeline

There are some problems such as a large amount of liquid slug existing and the difficulty of pig's speed control when the pipeline pigging operations are conducted by traditional pig. Recently, by pass pigging is becoming the key innovation technology because it can effectively reduce liquid slug and realize redistribution of the chemicals such as corrosion inhibitors. In this paper, on the basis of the by pass analyses technology, the gas-condensed submarine pipeline pigging model is set up by using the multiphase flow dynamic simulation software OLGA, and the effects of the pipeline parameters, operating conditions, and the seabed environment to the by pass pigging are simulated. On this base, the comparisons between the traditional pigging and the by pass pigging have been done through the changes of pigging velocity, pressure, and liquid slug etc. Meanwhile the optimum by pass rate is obtained which provides guidance for the practical applications of by pass pigging.