stuck after releasing the pressure in the tool by pulling the coiled tubing up the top shear ring 3 and the bottom shear ring 20 are easily sheared which subsequently releases the rubber elements 26 unsetting and freeing the packer the independence of the shear value to shear of the shear rings 3 20 from the pressures experienced by the sps during the treatment allows an operator to preset the shear at minimum reasonable required values based only on the strength of the coiled tubing and the depth of the attempted treatment in the well bore in addition the design of the sps does not require the tool to be removed from the well bore even if at some point of the treatment in the well bore the shear rings 3 20 were sheared off in the case of the top section of the sps an increase in pressure inside the tool results in the movement of the piston adapter 5 upwards this movement slides the rubber elements 26 and the sheared top shear ring 3 and the spacer 2 up until the spacer encounters and is supported on the coiled tubing disconnect 2 a since further movement up of the spacer 2 and the top shear ring 3 is not possible the rubber element 26 is compressed which in turn sets the sps in the case of the bottom section of the sps an increase in the pressure in the sps results in the upward movement of the power shear pistons 21 and 24 and the sheared bottom shear ring 20 simultaneous downward movement of the piston adapter 5.