Surfactant-based foam drainage technology is a favored method of liquid accumulation removal, and it has been demonstrated as an efficient way to improve gas production efficiency. However, foam properties are extremely complex and the same surfactant can produce foam systems with widely varying properties under different environmental conditions. This has a huge impact on the multiphase flow containing foam and thus on the efficiency of fluid removal. To further explore the influences of changing foam properties on the flow characteristics and the liquid-carrying capacity of foam, this study experimentally investigated the gas–liquid multiphase flow containing different foams in a hilly terrain pipeline with different properties in pipelines by adding SDS surfactant and MgCl₂. The results show that the foam stability can significantly affect the gas–liquid multiphase flow characteristics. Adding MgCl₂ enhances the stability of SDS foam. This narrows the range of intermittent flow conditions and leads to a significant fall in the critical gas velocity corresponding to the transition from intermittent to separated flow. Meanwhile, under the same gas and liquid velocities conditions, the foam with higher stability has a more pronounced suppression effect on the velocity of liquid in the upward inclined section, both the slug velocity and the liquid reflux velocity. The reduction in the holding rate also indicates that a more-stable foam improves the liquid-carrying capacity of gas and the discharge efficiency. In addition, as the gas velocity increases, the enhanced stability promotes the transition of the flow pattern from stratified to annular flow, resulting in a remarkable increase in the pressure drop gradient. This suggests that a more stable foam system is suitable for environments with lower gas velocities.

基于表面活性剂的泡沫排水技术是一种受欢迎的液体聚集去除方法，已被证明是提高产气效率的有效方法。然而，泡沫的性质极其复杂，相同的表面活性剂可以在不同的环境条件下产生具有广泛不同性质的泡沫体系。这对含有泡沫的多相流产生巨大影响，从而对流体去除效率产生巨大影响。为进一步探究泡沫特性变化对泡沫流动特性和携液能力的影响，本研究通过添加SDS表面活性剂和不同特性的管道，对不同特性的丘陵地形管道中不同泡沫的气液多相流动进行了实验研究。氯化镁₂. 结果表明，泡沫稳定性能显着影响气液多相流动特性。添加 MgCl ₂增强 SDS 泡沫的稳定性。这缩小了间歇流动条件的范围，并导致临界气体速度显着下降，对应于从间歇流动到分离流动的转变。同时，在相同的气液速度条件下，稳定性较高的泡沫对向上倾斜段液体的速度，包括段塞速度和液体回流速度都有更显着的抑制作用。保持率的降低也表明更稳定的泡沫提高了气体的液体携带能力和排放效率。此外，随着气体速度的增加，稳定性的增强促进了流型从分层流向环状流的转变，导致压降梯度显着增加。