Water-shutoff method for sealing gas well effluent section by combination of incline cement and gas injection compression

The invention relates to a water shutoff method for closing a water-yielding region of a gas well by utilizing dumping device for matching with gas injection and compression. Gas injection is carried out to a target well so as to shove stored water in the well to the stratum and cause the well to maintain no water; meanwhile, a dump bailer is dropped down by a cabled twist and caused to be vertical to the section to be closed in the stratum; when reaching the closed section, the opening of the bottom of the dump bailer is opened to lead laitance arranged inside to flow out; the laitance flows out and first accumulates in the closed section and then slowly flows to a sieve tube and the gravel stratum in annular rings among the well wall, and gas injection is continued until the laitance solidifies and hardens so as to fulfill the purpose of blocking up the water-yielding stratum.