A Sheathed Nozzle for Abrasive Water Suspension Jets in Submerged Environments
A Sheathed Nozzle for Abrasive Water Suspension Jets in Submerged Environments
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DOI：
10.1299/kikaib.71.2458
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发表时间：
2005-10
期刊：
影响因子：
--
通讯作者：
S. Shimizu;T. Nishiyama;H. Kato
中科院分区：
文献类型：
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作者：
S. Shimizu;T. Nishiyama;H. Kato
磨料水悬浮射流在水下状态下的钻井能力随着离流距离的增大而急剧下降，钻切有效工作距离限制在较小的离流范围内。当距离较小时，喷嘴可能会被反射射流损坏。在狭窄的环境中，有时喷嘴不能设置得更靠近工作。因此，我们必须找到延长水下awsj有效工作距离的方法。本文提出了一种护套式AWSJ喷嘴，以延长水下AWSJ的有效工作距离。采用不锈钢试样对带护套的AWSJ喷嘴的钻进性能进行了试验研究。射流的观察也进行了有无磨料。护套式喷嘴有助于延长喷嘴与钻具之间的有效工作距离，而不会大幅降低钻井能力。
The drilling capability of abrasive water suspension jets (AWSJs) under submerged condition decreases steeply with the increase of the standoff distance, and effective working distance for drilling and cutting is restricted in small standoff distance region. When the standoff distance is small, the nozzle may be damaged by the reflected jet. In narrow environments the nozzle can not be set closer to the work sometimes. Accordingly we have to find methods to extend the effective working distance for submerged AWSJs. In this paper, a sheathed AWSJ nozzle is proposed as a means extending the effective working distance for submerged AWSJs. Experiments are conducted to clarify the drilling capability of the sheathed AWSJ nozzle with specimens of stainless steel. Observation of the jet is also carried out with and without abrasive. A sheathed nozzle is useful for extending the effective working distance between the nozzle and works without drastic reduction in drilling capability.