自振空化射流改善油层渗透率机理及实验研究

可以利用自振空化射流的振动和空化特性来解除或减轻地层堵塞，提高渗透率。借助高压釜装置对围压下自振空化射流提高污染岩心渗透率进行了实验研究。结果表明，随喷嘴出口直径、射流压力增加，自振空化射流改善油层渗透率的作用效果增强；处理中低渗岩心比高渗岩心需要更长的时间，对不同渗透率岩心作用效果不同，对中低渗、高渗岩心射流作用效果明显；空化噪声作用深度随射流压力的升高而增加。现场应用表明，自振空化射流在油井解堵、注水井增注方面作用效果明显。实验为拓宽自振空化射流的研究和应用领域提供了重要的参考依据。

Mechanism and experimental study of self-resonating cavitating jet for improving polluted rock permeability

The polluted rock core permeability could be improved by self-resonating cavitating jet with strong pressure oscillation and high cavitation inception characteristics. Experiments were conducted to investigate improvement of polluted rock permeability with self-resonating cavitating jets impingement under a high pressure vessel. The results show that the action effect of self-resonating cavitating jet improving permeability increases with the diameter of nozzle and jet pressure increasing. Meanwhile, under the same conditions, it needs more time for treating medium of low permeability rock samples than high ones, and the effect of medium and low permeability rock samples by the self-resonating cavitating jet is more obvious than extraordinarily low permeability ones. The action depth of self-resonating cavitating jet increases with the jet pressure increasing, Field applications also show that the self-resonating cavitating jet has obvious effects on broken down of oil production and water injection wells. The study will afford important evidence for widening self-resonating cavitating jets researches and applications.