机井双泵清淤在陕西省关中平原区已推广应用十多年,由于设备简单,操作方便,节约投资,对恢复旧机井,增大机井出水量效果显著,颇受群众欢迎。(一)机井双泵清淤的工作原理当高压射流冲击井底淤泥时,水流在井底形成水跃而翻滚,使淤泥和水充分混合形成浑水,然后再用水泵将浑水抽出并排走。这样借上、下循环水来清除井底淤泥,增大井下水深,使机井出水量增加。(二)射流对井底淤泥冲击力的计算由于下冲水流经过输水管垂直于井底淤泥面,故射流冲击力可按对称冲击射流公式计算: Double-pump dredging of shaft has been widely used in Guanzhong Plain of Shaanxi Province for more than ten years. Because of its simple equipment, convenient operation and saving investment, it is very popular to restore the old shaft and increase the water output of the shaft. (A) The working principle of dual-pump dredging machine When high-pressure jet impact on the bottom of the mud, the water flow in the bottom of the well to form a water jump and tumble, the mud and water to fully mix to form muddy water, and then pump the muddy water out and side by side . This by borrowing, the next cycle of water to remove bottom silt, increasing underground water depth, so that wells increased water output. (B) jet impact on the calculation of the bottom of silt As the next flush through the water pipe perpendicular to the silt surface downhole, so the jet impact force can be symmetrical impact jet formula: