Enlarged diameter tapered stabilizer

The utility model provides an enlarged diameter tapered stabilizer for oil prospecting and drilling. A centralizer body of the utility model is connected with a lower connector, a mandrel is arranged between the centralizer body and the connector, wherein a nozzle, a piston and an upper pressing spring are arranged at one end of the mandrel, and a lower pressing spring is arranged at the other end; the centralizer body is provided with a plurality of holes, an anti-wear column and a piston A or a piston B are arranged in the holes. The utility model is of advanced design, reliable capability as the main functional components are always lubricated by oil and no slurry enters. The utility model can be applied for tracking control of the center borehole for oil prospecting and drilling.