Excellent and fast drilling technology in well-202 of Tailai block in southeast Sichuan

Shaximiao formation and Qianfuya formation have developed sand-mudstone inter-bedded layers,the wellbore is easy to lose stability,the compressive strength is strong,and the drill ability is poor,which increases the difficulty of bit selection and construction parameter optimization in conventional drilling process.Through the air drilling and New-Drill drilling technology,the high temperature resistant screw is used in the directional well section,and the undersized stabilizer is used to stabilize the BHA,which not only improves the proportion of composite drilling,but also ensures the change rate of the full angle of the borehole.Field application results show that the actual drilling depth is 5 240 m and the vertical depth is 5 050 m.The drilling period was 181.3 d,the completion period was 203.9 d,and the construction period was 220.7 d,which set a record for the fastest construction period of similar wells in Tailai working area in southeast Sichuan province,providing good experiences for the construction of similar wells.