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首页> 外文期刊>International Journal of Multiphase Flow >The elimination of severe slugging—experiments and modeling
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The elimination of severe slugging—experiments and modeling

机译：消除严重的拍击现象-实验和建模

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Severe slugging can occur in a pipeline-riser system operating at low liquid and gas rates. The flow of gas into the riser can be blocked by liquid accumulation at the base of the riser. This can cause formation of liquid slugs of a length equal to or longer than the height of the riser. A cyclic process results in which a period of no liquid production into the separator occurs, followed by a period of very high liquid production. This study is an experimental and theoretical investigation of two methods for eliminating this undesirable phenomenon, using choking and gas lift. Choking was found to effectively eliminate or reduce the severity of the slugging. However, the system pressure might increase to some extent. Gas lift can also eliminate severe slugging. While choking reduces the velocities in the riser, gas lift increases the velocities, approaching annular flow. It was found that a relatively large amount of gas was needed before gas injection would completely stabilize the flow through the riser. However, gas injection reduces the slug length and cycle time, causing a more continuous production and a lower system pressure. Theoretical models for the elimination of severe slugging by gas lift and choking have been developed. The models enable the prediction of the flow behavior in the riser. One model is capable of predicting the unstable flow conditions for severe slugging based on a static force balance. The second method is a simplified transient model based on the assumption of a quasi-equilibrium force balance. This model can be used to estimate the characteristics of the flow, such as slug length and cycle time. The models were tested against new severe slugging data acquired in this study. An excellent agreement between the experimental data and the theoretical models was found.
机译：在低液体和气体速率下运行的管道提升系统中可能会发生严重的打塞现象。气体流入立管可被立管底部的液体积聚阻塞。这会导致形成长度等于或大于立管高度的液体块。循环过程导致在分离器中没有液体产生的时间段，随后是非常高的液体产生的时间段。这项研究是使用扼流圈和气举来消除这种不良现象的两种方法的实验和理论研究。发现窒息可有效消除或减少击打的严重性。但是，系统压力可能会有所增加。气举也可以消除严重的撞击。 cho塞会降低立管中的速度，而气举则会增加速度，从而接近环形流。已经发现，在气体注入将完全稳定通过立管的流动之前需要相对大量的气体。但是，注气会减少段塞长度和周期时间，从而导致生产更加连续且系统压力较低。已经开发出用于消除因气举和阻塞而导致的严重塞的理论模型。这些模型可以预测立管中的流动行为。一种模型能够基于静态力平衡来预测严重击打的不稳定流动条件。第二种方法是基于准平衡力平衡假设的简化瞬态模型。该模型可用于估计流的特性，例如段塞长度和循环时间。针对该研究中获得的新的严重拍击数据对模型进行了测试。实验数据和理论模型之间找到了极好的一致性。

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