Progress and Development Recommendations for Optimized Fast Drilling Technology in Shale Gas Horizontal Wells in the Nanchuan Area

the Nanchuan Area is another shale gas deliverability construction area of Sinopec and it follows the phase I deliverability construction of the Fuling shale gas area. In order to further improve the ROP and drilling efficiency of shale gas horizontal wells in this area, and to take into consideration the mature experiences of the Fuling shale gas phase I project, this paper systematically summarizes the existing problems in drilling the shale gas horizontal wells in this area. An optimized fast drilling technology for shale gas horizontal wells in Nanchuan Area was designed based on the analysis and research on the optimization of casing program, customized high-efficiency bit, wellbore trajectory design, cementing and completion modes, and the multi-well pad construction mode with combined drilling rigs, etc., This drilling technology was applied in more than 30 wells in the South Pingqiao Block of Nanchuan, which shortened the average drilling cycle from 92.00 d to 79.67 d and increased the average encountering rate of high-quality reservoirs to more than 98%. Further, more than 60% of these wells achieved a footage of more than 1,000 m in one trip, proving that the drilling technology could greatly improve the ROP and efficiency. On this basis, taken together with the horizontal well drilling difficulties in the JY10 Well Block and the Dongsheng Block with complex structure, recommendations were made to provide technical support for the subsequent deliverability, construction and efficient drilling in the Nanchuan Area.