Abstract: Screen top cementing completion technology has been applied on more than 60% of horizontal wells in Shengli Oilfield. Main drawbacks of the technology are casing wear in the procedure of plug drilling and burr remaining of inner surface after plug drilling, which are obstacles of followed well intervention. To avoid the damage to completion string during plug drilling, Plug-drilling-free tools are developed with the function of external casing packer, stage collar and blanking plate. Lab experiment and pilot test are carried out. During well completion, after screen top cementing, trip spear was run into hole to fish the inner tube. The technology eliminates the disadvantages of plug drilling and saves completion duration and cost. It has been applied on more than 40 wells of Shengli Oilfield, which guarantees the followed treatment effect of acid pickling and gravel packing, and compels the progress of horizontal well completion technology.