1983年初605机、604机先后到沭阳磷矿区进行普查施工,施工中一直是用优质粘土(山东高阳粘土)、聚丙烯酰胺处理剂配制的优质泥浆护孔。由于该矿区地层较特殊,第四系(粘土、砂质亚粘土、砂砾层)下边有一层第三系红层:紫红色粉砂岩、中粗砂岩、含砾中粗砂岩及砂砾岩等。该层比较厚,一般在100—450m 之间、岩性吸水性强,泥质含量高,钻进过程中造浆能力特 At the beginning of 1983, the 605 machine and the 604 machine went to the Puyang phosphate deposit area for census construction. The construction has always been the use of high-quality clay (Shandong Gaoyang clay) and polyacrylamide treatment agent to prepare high-quality mud protection holes. Due to the special strata in the mining area, there is a third layer of tertiary red beneath the Quaternary (clay, sandy sub-clay, gravel layer): purple-red siltstone, medium-grained sandstone, pebbly medium coarse-grained sandstone, and glutenite. The layer is relatively thick, generally between 100-450m, strong lithological water absorption, high mud content, and pulping ability during drilling process.