FIELD: drilling. SUBSTANCE: installed on thread 4 in body 1 connected to pipe string 15 is rod with axial channel 6 and radial channels 19. Secured in rod lower part is cone 7 with hooks 8. Freely installed in lower part of body 1 is crown bit 11 with side ports 12. In initial position, cone 7 is located below the lower end of crown bit 11. When landing on plug, rotation is engaged with simultaneous supply of flushing fluid. Cone 7 and crown bit 11 are braked due to interaction with plug material. Rod 5 is retracted to catch flexible member and wedged it in crown bit. Then, device is lifted to the surface. EFFECT: higher efficiency. 10 cl, 1 dwg
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