Abstract:The exploration of the central uplift belt in northern Songliao Basin shows that the reservoir conditions are greatly influenced by fractures. Therefore， Well Changtan-1 was deployed in the northeast of Well Longtan-X3 which is closer to the fracture belt of Xuxi， and where the fault activity is obvious. The total designed depth is 5086.90m with vertical depth of 3906.70m and maximum inclination of 81.95°.The basal structure of Songliao Basin is very complex and the type and composition of the fault is variegated because of multiphase tectonic activities， which increases the difficulty on drilling design and field operations. In view of the difficulties and risks that may be encountered in the drilling process of the well， the safety feasibility analysis is conducted with optimization of the well structure， well trajectory， drilling parameter and drill bit. Field drilling results showed that the average rate of penetration is 4.20 m/h with the drilling period of 120.67d which is shortened by 20.35% compared with nearby wells， increasing drilling efficiency to a great extent. It provides valuable experience for exploration of the basal structure in the region.