自激振荡脉冲消泡机制分析与性能优化

Menchanism analysis and performance optimization on self-excited oscillation pulse foam breaking device

经济、环保、高效的消泡技术是泡沫钻井液循环利用的基础,基于该认识,提出自激振荡脉冲消泡技术。将数值模拟和试验研究相结合,分析自激振荡脉冲消泡的机制,探索消泡器性能的优化方法。采用正交试验法,优选自激振荡脉冲消泡器的结构参数。结果表明:自激振荡腔内能够形成显著的涡量扰动,激发局部负压和强烈湍流协同作用,致使泡沫破裂;自激振荡脉冲腔室内最大负压的绝对值和最大湍流强度均与消泡效率呈显著的指数相关,证实了自激振荡脉冲消泡机制;数值计算与试验结果吻合良好,提出的消泡技术可行。

Economical,environmental and efficient antifoaming technology is the basis for achievement of foam drilling fluid recycling.Self-excited oscillation pulse foam breaking technology was proposed based on this.By combination of simulation and experiments,self-excited oscillation pulse foam breaking principle was analyzed,and defoaming optimization method was explored.According to orthogonal test,the structure parameters of self-excited oscillation pulse deformer were optimized.The results show that vorticity disturbance can obviously generate and stimulate local vacuum and strong turbulence in self-excited oscillation cavity,which can break foams.The maximum negative value（absolute value） and maximum turbulence intensity in self-excited oscillation cavity were significantly index correlated with defoaming efficiency.The consistence between numerical and experimental results demonstrates that the methods used to analyze self-excited oscillation pulse properties and to optimize deformer structure are feasible.