Yuanye HF-1 is the first shale gas pre-exploration horizontal well in Yuanba block of Northeastern Sichuan. Based on the analysis on the difficult points in engineering geology, the third spud section structure was optimized; rational drilling method, drilling fluid system and drilling process measures are selected to form a set of shale gas horizontal well drilling technical scheme suitable for this area. The well is drilled to the objective layer with drilled depth of 4982m, horizontal displacement of 1421.73mm, drilling cycle of 168.88d, average penetration rate of 3.07m/h and the three open well diameter enlargement ratio is only 4.82%.