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水文水井钻探中，最常见的地层为第四系砂层、砂砾层，基岩为灰岩的破碎带等。在这种地层中施工，井壁稳定性差，必须采用泥浆护壁，某些化学处理剂处理的泥浆起到一定的净化作用。但在钻进过程中，泥浆砂侵严重，泥浆性能遭到破坏，促使水泵部件、水龙头、钻头磨损加剧，甚至1—5mm的砂粒进入水泵，使水泵被迫停止运转，影响施工。所以采用机械除砂方法控制泥浆的比重和含砂量是非常重要的。
Drilling in hydrology and water wells, the most common strata Quaternary sand, gravel, bedrock broken limestone and other rocks. Construction in such strata, shaft wall stability is poor, must use the mud wall, some of the chemical treatment agent to play a role in purifying the mud. However, during the drilling process, mud sand invasion is serious, mud performance is destroyed, prompting pump parts, faucets, drill wear increased, and even 1-5mm sand into the pump, the pump was forced to stop working, affecting the construction. Therefore, the use of mechanical sand removal method to control the proportion of mud and sand content is very important.