基于旋流文丘里管–泡沫发生器内流场模拟分析及结构优选

Simulation Analysis and Structural Optimization of the Flow Field in the Swirl Venturi-Foam Generator

摘要: 本文针对油田冲砂洗井工艺中泡沫发生器发泡效率低、井下消泡严重的问题，结合气液两相流动机理，开展泡沫发生器结构优化与内部流场数值模拟研究。在现有的泡沫发生器结构基础上，新增旋流文丘里管结构，并在螺旋搅拌式泡沫发生器内部结构中设置正、逆旋区域。通过内部流场的数值模拟，对比分析内部流场的气相分布、速度分布、迹线分布及内部压力变化情况，系统地分析多级挡板扰流式、螺旋挡板式、螺旋搅拌式3种内部结构不同的泡沫发生器的发泡性能。模拟结果表明：螺旋搅拌式泡沫发生器的发泡性能最好，比螺旋挡板式混合效果提升2%左右。

Abstract: Aiming at the problems of low foaming efficiency and severe downhole defoaming in the sand flushing and well washing process of oil fields, this paper combines the gas-liquid two-phase flow mechanism to carry out the optimization of foam generator structure and numerical simulation of internal flow field. On the basis of the existing foam generator structure, a swirl venturi tube structure is added, and positive and reverse swirl areas are set in the internal structure of the spiral stirring foam generator. Through the numerical simulation of the internal flow field, the gas phase distribution, velocity distribution, trace distribution and internal pressure change of the internal flow field are compared and analyzed, and the foaming performance of three foam generators with different internal structures, namely multi-stage baffle turbulence type, spiral baffle type and spiral stirring type, is systematically analyzed. The simulation results show that the spiral stirring foam generator has the best foaming performance, which is about 2% higher than the spiral baffle type mixing effect.