I.II interface flee-proof sleeve with vortex brush for well cementing

The utility model belongs to the well cementing sleeve field in petroleum well drilling, relating to an anti-channelling sleeve preventing air/liquid channelling being generated in a first and a second interfaces after well cementing. The sleeve is arranged in a well bore. An annular space between the well bore and the sleeve is filled with cement to form a well cementing cement annular cylinder which seals the well bore and the sleeve as integration. The outer wall of the sleeve is coated with an adhesive layer, bonded with a sand layer and clamped with at least one group of steel brushes of the second interface and an anti-channelling square steel clamp. The utility model has the advantages of high washing flow rate, high cleanness, good cementing strength of the interfaces, and no gaps on the interfaces, can prevent gas and liquid from channelling in the first and the second interfaces, and reach the effects of high oil output and enhancing oil recovery.