Based on the summery of previous drilling experience, analysis was made on the factors which influence ROP in deep well drilling in Yuanba Block from the aspects of geologic factors, complex drilling conditions, rock drillability, formation temperature, mud density and casing program. There are 2 main affecting factors: one is the limit of wellbore configuration stratification, which can not effectively seal the formations with different pressure system; another is that the gas drilling can not be used because of bad formation drillability with a deep and long drilling section. Gas drilling, bit selection and dynamic drilling tool coordinating with high efficiency bit scheme are presented for Xujiahe formation drilling and casing program with particular well size are introduced to give technical support for deep well drilling in Yuanba Block.