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凝析气的特殊性质导致其在集输过程中可能形成段塞流,严重影响集输系统的稳定性和安全性,段塞流的成功预测是确保凝析气集输管道正常运行的关键。以巴喀凝析气田集输管道为例,首先根据Hysys中气体组分的气相平衡图,分析管道系统形成段塞流的可能性,然后利用Pipsys分析该管道在不同压力、温度和高程工况下的运行状态,最终根据管道内的液体体积分数及管道持液量,判断管道内段塞流的形成。研究结果表明:随着压力的增大,管道内介质先从两相流转化为单相流(气相),再转化为两相流并有段塞流产生。通过对模拟结果进行分析,给出了预防段塞流形成的可行措施。
The special nature of condensate gas may lead to slug flow in the process of gathering and transportation, which will seriously affect the stability and safety of the gathering and transportation system. The successful prediction of slug flow is the key to ensure the normal operation of condensate gas gathering and transporting pipelines. Taking the gas gathering pipeline in Baqacan condensate gas field as an example, the possibility of forming slug flow in the piping system is analyzed according to the gas phase equilibrium diagram of gas components in Hysys. Pipsys is then used to analyze the gas pipeline under different pressure, temperature and elevation conditions Under the running state, and ultimately according to the liquid volume fraction of the pipe and the liquid holding pipe to determine the formation of pipe slug flow. The results show that with the increase of pressure, the medium in the pipeline first transforms from two-phase flow into single-phase flow (gas phase), and then into two-phase flow with slug flow. Through the analysis of the simulation results, the feasible measures to prevent the formation of slug flow are given.