Abstract: Pubei Ⅲ fault block located at the south ofDaqing Changyuan deposition body, because the sandbody issmall and narrow, distributed scattered, interlayer, innerlayer and the plane anisotropism is serious, stabilizing oiloutput and controlling water content is very difficult. Basedon reservoir fine description and residual oil research, wecombined and implemented oil and water well bidirectionalprofile modification, long packer subdivide adjustment andwater injection well acidification and many other measures,which make the development target better, improved the oil-field development effect. This technology has providedreference for under water narrow and small sand body highwatery period development.