Composite casing cutter head for well repair in oil field

The invention relates to a composite casing cutter head for well repair in an oil field. The composite casing cutter head for well repair in the oil field can mainly solve the problems that an existing casing cutter head can not perform casing milling of a well section with a large curvature and a lower casing milling tubular column needs to be pulled out. The composite casing cutter head is characterized in that eight cutter bodies (2) are fixed at the lower end of a body (1) wall, rigid alloy (3) is embedded in the inner side, the outer side and the top of each cutter body (2), carrier plates (4) are connected between cutter bodies (2) and waterway grooves (5) are axially formed inside and outside a main body (1) and the carrier plates (4). Rolling balls (6) are arranged in horizontal holes of the main body (1) corresponding to the waterway grooves (5). Ball seats (7) are arranged on the inner sides of the rolling balls (6) and ball carriers (8) are arranged on the inner sides of the ball seats (7). The rol