Abstract: To improve the development effect of Xinchang gas field in western Sichuan, a long lateral-section horizontal well pattern of three wells was deployed in the northern of Xinchang structure. Based on the analysis on reservoir geology characteristics, the well structures were optimized to two trips from three trips. These wells have the characteristics of long open hole, long lateral section, and large displacement. Through making the hole trajectory control measures, monitoring drag and torque, and optimizing drilling fluid, the drilling efficiency of the pattern wells has been greatly improved, cooperated with PDC bit during drilling, which provided precious experiences for drilling long lateral-section horizontal wells in mid-depth formation in western Sichuan.