Two-end full-expansion casing damage well patching tool

The utility model provides a two-end full-expansion casing damage well patching tool, which relates to the technical field of oil field well repair tools, and adopts the technical scheme that the two-end full-expansion casing damage well patching tool comprises a power hydraulic device, the output end of the power hydraulic device is connected with a central pull rod, the outer side of the central pull rod is sleeved with a patching pipe, and the upper end and the lower end of the patching pipe are respectively provided with an upper sealer and a lower sealer; an upper expander and a lower expander are arranged at the ends, away from each other, of the upper sealer and the lower sealer correspondingly. The patching tool has the advantages that the patching tool is simple in overall structure, the patching pipe can be additionally arranged between the two slips according to the length of a damaged section of a casing pipe, the patching pipe is connected in series through screw threads, the patching pipe can be