137 on the body lock ring 58 are not initially engaged with the corresponding threads 19 on the mandrel o d surface consequently the lower collet cone 54 may be displaced along the mandrel surface to load compressively against the packer 60 until the calibrated shear force of fastener 55 is overcome at that moment the upper edge of the circumferential web 140 portion of the cage ring 52 engages the base of the wicker shoe to force the wicker shoe slip face 122 upon the conical slip face 132 thereby expanding the wicker radially until the wicker teeth 120 penetrate the well wall 15 engagement of the buttress threads on the body lock ring 127 attached to the upper end of the lower cylinder wall 20 with the external buttress threads 129 on the lower piston 26 irreversibly secures the relative position this completes the packer tool setting removal of the tool from the well essentially requires the same sequence of that followed when setting the tool specifically the debris barrier 80 and the upper anchor 70 is released followed by release of the packer seals 60 upon release of the packer seals the lower anchor 50 is released the foregoing sequence is initiated by cutting the mandrel 12 in the.