Abstract: Self-resonating cavitation jet is a new type jet with the characteristics of strong pressure oscillation and high-cavitation inception.The effects of working parameters on the improvement of permeability of polluted rock by self-resonating cavitation jets impingement in a high-pressure vessel were investigated.The result shows that the effective depth of cavitation jet on the polluted rocks with different permeability is more than 250 mm.The increasing rate of permeability could be improved with the jet pressure increasing and reduced with the nozzle stand-off distance increasing.Meanwhile,the increasing rate of permeability can reach the maximum at the ambient pressure of 2 MPa.Under the same conditions,the increasing rate resulted from the self-resonating cavitation jet nozzle is two times of that from a conical nozzle.Field applications also showed that the self-resonating cavitation jets have obvious effectiveness on the plug removal of oil and water injection wells.

Key words: self-resonating cavitation jet, ambient pressure, permeability, jet pressure, plug removal, experimental study

摘要： 自振空化射流是具有强烈压力振荡和高空化起始能力的新型射流,利用高压釜装置对围压下自振空化射流提高污染岩渗透率进行的实验研究结果表明,对中、低和高渗透率岩样,空化射流作用深度均超过250mm,渗透率提高率随射流压力的增大而增加,随喷距的增大而减小;当围压值为2MPa时,渗透率提高率达到最大值.同时,在相同条件下,自振空化喷嘴作用下渗透率提高率为锥形喷嘴作用的2倍以上.现场应用效果证明,自振空化射流对解除油层和水层堵塞有明显效果.

关键词: 自振空化射流; 围压; 渗透率; 射流压力; 解堵; 实验研究;