农用机井在使用过程中甚至在刚刚成井时就会出现一些问题,如出水量减少,含沙量增大,形成淤井、腰漏、堵井等,严重的导致机井报废。通过几年来修井实践和调查,除因地下水位下降致使部分浅井干涸报废外,绝大部分机井报废是可以预防和避免的。1 机井报废的原因1.1 淤井。由于泥沙淤积影响,轻的造成出水量小,严重的以致完全报废。淤井的主要原因有以下几种:打井时滤料不合格, Some problems occur during the operation of the agricultural shaft, such as the decrease of the amount of water discharged, the increase of the sediment concentration, the formation of silt, lumbar leakage and plugging, even when it is just completed. This has seriously damaged the shaft. Through years of well-practice and investigation, except for the descent of the groundwater table, some of the shallow wells have been dried up, and the vast majority of shaft scrapping can be prevented and avoided. 1 wells scrap reason 1.1 silt. As a result of siltation, light caused by a small amount of water, so serious as to completely scrapped. Sludge the main reasons are the following: Drilling filter failure,