滤水管是机井的关键部件 ,安装在井管的下部 ,下在含水层处 ,主要起护壁及滤水挡沙作用。机井能否正常工作及出水量的多少等均与滤水管的结构有关。选用适宜的滤水管 ,不但能防止涌沙 ,而且能得到最大的出水量 ,并延长机井的寿命。1　滤水管的类型及特点滤水管的类型很多 ,常用 Drainage pipe is a key part of the well, installed in the lower part of the well pipe, the aquifer at the bottom, mainly from the role of retaining wall and filter water to prevent sand. Well can work well and the amount of water, etc. are related to the structure of the filter. Selection of suitable filters, not only to prevent the surge, but also to get the maximum amount of water, and extend the life of wells. A type of filter and the type of filter Many types of filter, commonly used