Y5水文地质勘探孔孔深 1 80 1 8m ,施工技术措施为 :井管安装采用分段下管两次固井法 ;采用前导向后扶正组合钻具逐级扩孔法纠斜 ;采用无固相及低固相泥浆钻进 ;钻孔比原设计加深 ,超过钻机的设计能力 ,对钻机进行了一些改进 ;固井单向阀由 2 1 9mm井管下端移至上端。 Y5 Hydrogeological exploration hole hole depth 1 80 1 8m, construction techniques are as follows: well pipe installation sub-pipe two cementing method; the use of pre-guide post-righting combination drill bit by step reaming oblique correction; using no solid Phase and low-solid mud drilling; drilling deeper than the original design, beyond the design capacity of the rig, some improvements to the drilling rig; cementing check valve from the lower end of 2 1 9mm well pipe moved to the upper end.