In accordance with downhole tubing sticking by sand burial accident, this paper proposes hollow rod sand washing after analysis of downhole string structure and hydraulic calculation of sand grain.
针对处理井下油管砂埋遇卡事故作业中出现的技术问题，在分析井下管柱结构及砂粒的水力计算的基础上，提出了空心抽油杆冲砂工艺处理措施。
In consideration of magnetic driven sand washing apparatus, an optimal design plan for axial-flow impeller is put forward for improving the hydraulic performance of blades.
针对一种磁力驱动的循环冲沙装置，提出了轴流式叶轮优化方案以提高叶轮水力性能。
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