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我国农用机井保有量已达240万眼,但因成井质量差和机井涌砂淤积较为普遍,致使井的年报废率高达7～8％,也就是说每年报费机井(需打更新井)高达17～20万眼。为了解决机井涌砂淤积问题,河南省许昌市水利局经过8年的试验摸索,研制出适用于粉细砂和中砂地层的系列化多孔混凝土井管,并在豫、鲁、皖等省用于成井2200多眼而均获成功。该项成果已于1990年10月通过国家级鉴定,并获得与会专家好评。该滤水管集骨架管和拦砂反滤层于一体,具有防涌砂淤
However, the annual scrap rate of the well is as high as 7 ~ 8% due to the poor well-forming quality and the gushing of gob-gushing memorized sand. In other words, the annual report rate of wellbores (to be rebuilt) 17 ~ 200,000 eyes. In order to solve the problem of machine gushing and silting, Xuchang City Water Conservancy Bureau of Henan Province, after eight years of trial and exploration, has developed a series of fine sand and sand formations of porous concrete well pipe, and Henan, Shandong and Anhui provinces More than 2,200 eyes into wells and have been successful. The result was passed the national appraisal in October 1990 and was highly praised by participating experts. The filter pipe skeleton pipe and sand filter layer in one, with anti-gushed silt