气液两相间歇流管道蜡沉积实验研究

Experimental study on pipeline wax deposition of oil and gas two-phase intermittent flow

采用含蜡模拟油和空气为实验介质,利用蜡沉积实验环道,研究间歇流流型下气、液相折算速度和温度对蜡沉积速率的影响,并结合高温气相色谱探讨沉积物碳数分布的变化规律。结果如下:在间歇流流型下,沉积物分布在整个管壁内,且形状随气、液两相折算速度的变化而变化;平均蜡沉积厚度随着气相折算速度的增大而减小,随液相折算速度的增加先增后减;固定管壁温度不变,平均蜡沉积厚度随着油温的增加先增加后减小;固定油温不变,蜡沉积量随着壁温的增加逐渐减少;气液相流速的增大均会导致沉积物的硬度增大(表现为沉积物碳数分布的变化)。

This work studies the effects of oil and gas superficial velocities and temperature on wax deposition thickness and carbon number distribution for intermittent flow of waxy mineral white oil and high-pressure air. The results are shown as follows： the wax deposit around the whole pipe, and the shape changes with the oil and gas superficial velocities. The equivalent deposit thickness decreases with increase of gas velocity, while with increase of oil velocity the deposit thickness increases first and then decreases. Equivalent deposit thickness increases first and then decreases with increase of oil temperature, while decreases with increase of wall temperature at a constant oil temperature. Increases of oil and gas velocities lead to increase of deposition hardness, which is characterized by variation of carbon number.