Baolige Ba19 fault block is located in BaⅡstructural belt of southern sag of Bayindulan in the northeast of Erlian Basin Manite depression which lies in the west of Dongwuzhumuqin Banner, inner Mongolia Autonomous Region. Most of the new-drilled horizontal wells have not reached the deliverability requirements, therefore, it is determined to perform staged fracturing reform. Based on the reservoir geology characteristics, reservoir development process, the paper carried out horizontal well ball staged fract...