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局部弯曲在实际应用中不可避免,因此有必要探讨含局部弯曲管道气举的提升特性。以气举中的核心部件提升管为研究对象,对弯曲位置和角度进行试验测试。结果表明:弯曲位置为主因,且90°弯管位于进气口上游时对气力提升性能影响最显著;在定浸没率下,不同结构提升管排水量峰值所对应的进气量在42~46 m3/h范围内略有差异;气液混合相流经局部弯管后,流型由弹状流转变为不利提升的环状流,从而影响提升能力。测试试验证实,弯曲管道压头损失和混合流体在弯曲区域的气液分层流动是气力提升效率下降的主要诱因。
Local bending is inevitable in practical application. Therefore, it is necessary to investigate the lifting characteristics of gas bending with locally curved pipe. Taking the core component riser in gas lift as the research object, the bending position and angle were tested. The results show that the bending position is the main reason, and the 90 ° elbow pipe is located at the upstream of the air inlet, which has the most significant influence on the air lift performance. Under constant immersion rate, the air intake corresponding to the peak value of the displacement of the riser with different structures corresponds to 42 ~ 46 m3 / h range slightly different; mixed flow of gas and liquid through the local elbow, the flow from the slug flow into adverse lifting ring flow, thus affecting the lifting capacity. Tests and tests confirm that the loss of bending pipe head and the laminar flow of gas-liquid mixture in the bending region are the main reasons for the decrease of the efficiency of gas lift.