起伏管气液两相携液能力的试验研究

Experimental Study on Gas-Liquid Two-Phase Carrying Capacity of Undulating Pipeline

为了研究气田中地面起伏管线的输送特性,采用室内模拟试验与数值模拟相结合的方法,研究管线积液情况和气量、液量和倾斜角等因素的影响规律。通过倾斜管线气液多相流室内模拟试验测量了不同气量、液量和倾斜角下的压降和携液量,发现压降和携液量随气量、液量的增加显著增大。当气量在35~70 m3/h时,由于管内形成了段塞流,携液量波动较为明显。起伏管线的沿程持液率模拟显示,积液主要位于凹陷段和上倾段,且随着气量增大,逐渐向上倾段偏移。当倾斜角增加时,上倾段的持液率不断下降然后上升,在6°时具有最小值,压降则随角度线性增大。基于试验数据和马克赫杰-布里尔计算方法,建立了起伏管路上倾段的持液率预测公式,误差低于5%。研究结果可为集输管线的防积液工艺参数优化提供参考。

In order to capture the transportation characteristics of undulating surface pipelines in gas fields,laboratory experiment and numerical simulation were combined to investigate the liquid accumulation in pipelines and the influences of factors such as gas flow rate,liquid flow rate and dip angle.Through the laboratory simulation experiment of gas-liquid two-phase flow in undulating pipeline,the pressure drop and carrying capacity at different gas flow rates,liquid flow rates and dip angles were measured.It is found that the pressure drop and carrying capacity increase significantly with the increasing gas and liquid flow rates.Especially,when the gas flow rate reaches 35-70 m3/h,the carrying capacity fluctuates significantly,due to the slug flow present in the pipe.The simulated liquid holdup along the undulating pipeline shows that liquid is mainly accumulated in the concave and up-dip sections,and gradually toward the up-dip section with the increasing gas flow rate.As the dip angle grows,the liquid holdup in the up-dip section first declines and then rises,with a minimum value occurring at the dip angle of 6°.Based on the experimental data and Mukherjee-Brill model,the liquid holdup prediction formula of the up-dip section was developed,with errors less than 5%.The research findings provide references for the parameter optimization of the anti-liquid accumulation technology of the gathering pipeline.