Flow Pattern and Pressure Fluctuation of Severe Slugging in Pipeline-riser System

在利用期间近海油和气体，形成严重猛击是容易的哪个能在连接水源的起床人引起大伤害并且近海平台预处理系统。严重猛击的流动模式和压力变化与 0.051 m 的内部直径在一个试验性的模拟系统被学习。严重猛击能被划分成三严重猛击政体，这被发现：我与大压力变化，在起床人的液体和气体的断断续续的流动，和液体阶段的明显的截止在低气体和液体流动评估的政体，以有非周期性的变化和不连续的液体流出和没有煤气的截止的高煤气的流动率的政体 II ，以有退化压力变化处于良好的竟技状态的高液体流动率的政体 III 相对冒泡的马厩或塞子流动。当管道的偏斜角度是 0 时。

During the exploitation of offshore oil and gas,it is easy to form severe slugging which can cause great harm in the riser connecting wellheads and offshore platform preprocessing system.The flow pattern and pressure fluctuation of severe slugging were studied in an experimental simulation system with inner diameter of 0.051 m.It is found that severe slugging can be divided into three severe slugging regimes：regime I at low gas and liquid flow rates with large pressure fluctuation,intermittent flow of liquid and gas in the riser,and apparent cutoff of liquid phase,regime II at high gas flow rate with non-periodic fluctuation and discontinuous liquid outflow and no gas cutoff,regime III at high liquid flow rate with degenerative pressure fluctuation in form of relatively stable bubbly or plug flow.The results indicate that severe slugging still occurs when the declination angle of pipeline is 0,and there are mainly two kinds of regimes：regime I and regime II.As the angle increases,the formation ranges of regime I and regime III increase slightly while that of regime II is not affected.With the increase of gas superficial velocity and liquid superficial velocity,the pressure fluctuation at the bottom of riser increases initially and then decreases.The maximum value of pressure fluctuation occurs at the transition boundary of regimes I and II.