used in this invention remains unchanged functionally the recoverable plug made as already mentioned should be provided with a conventional dredger not shown which is threaded to a string not shown attached by its dredging end 2 once these three elements are mounted it is possible to lower the tpr3 through the casing the dredger not shown has two main parts i e the friction sleeve and the gripping fingers in order to couple said dredger with the recoverable plug 1 the dredger is slipped through the upper part of the plug 1 so the friction sleeve of the dredger slips the valve 4 sleeve when the valve 4 sleeve reaches the lower stop jump of valve 3 mandrel the friction sleeve of the dredger continues its lowering stroke over the valve 4 sleeve passing the friction ring 6 in this stroke the u201c fingers u201d of the dredger cut through the u201c j u201d shaped portion of the dredging end 2 downwards thus describing the stroke given by the geometry having the shape of a lowering helix of the u201c j u201d further on the dredger rotates rightwise by 45 u00b0 due to the stroke of the fingers based on the geometry of the u201c j u201d then the dredger is pulled upwards and the friction sleeve passes again through the friction ring 6 upwards and the fingers of the dredger slips upwardly in a vertical way with no rotation 0 u00b0 so they remain trapped in the upper portion of the u201c j u201d shape of the dredging end in this way the friction sleeve remains between the friction ring 6 and the sleeve of valve 4 which is open in this situation plug 1 is in condition of being lowered to the well attached.