Multi-purpose self-sealing well sealer

The utility model discloses a multi-purpose self-sealing well sealer which can be used for the well drilling construction and well repair construction in petroleum industry. The utility model is composed of a steel body and a rubber cylinder, wherein the rubber cylinder in the steel body is a multi-valve rubber cylinder body; the outside is sheathed with an integral rubber cylinder sleeve. The multi-purpose self-sealing well sealer achieves the self deforming seal of large-scale diameter change and pipe strings with various shapes, enhances the through capacity of diameter changing tools, solves the sealing problem of different drilling tools in lifting and rotating, and achieves the sealing circulation of liquid entering wells without falling to the ground. The utility model saves the cost of drilling and repairing wells, and provides conditions for controlling well blowout and reducing oil layers and ground pollution.