Well BZ34-5-A was originally a high yield well, but a series of complex problems occurred in the later period, which made the well unable to produce. In order to restore the well productivity, comprehensive treatment of the low efficiency well was needed. Based on the analysis of drilling and completion data in the early stage of the block and the problems in the late stage after it was put into production, the final operation scheme was determined through comparison of the comprehensive treatment methods. The solid free drilling fluid with strong inhibition was used to for sidetracking, the perforation pipe was run into the open hole section without cementation, and then the perforation pipe was perforated with wireline perforation to complete the treatment of the inefficient well safely and quickly; thus protecting the reservoir to the maximum extent and restoring the productivity of the inefficient well. At the same time, the treatment cost was greatly reduced, which provides a good reference for similar low efficiency wells in nearby blocks.