Packer

The utility model provides a packer, including last center tube and lower center tube, on its lateral wall the cover have last slip assembly, down slip assembly and being used for promote upper and lower slip assembly along axial motion's hydraulic pressure setting mechanism, go up slip assembly and include slip spider and last cone, go up the slip spider and through first shear pin and last center tube fixed connection, go up the slip spider and pass through second shear pin and last cone fixed connection, slip assembly includes slip spider and lower cone down, and lower slip spider passes through third shear pin and lower cone fixed connection, going up slip assembly upper portion and being equipped with the sealing member, its upper end is fixed on last center tube, and the lower extreme is by the extrusion and along radially stretching out in order to form sealed protective screen under last slip assembly's thrust effect. The shear strength of second shear pin is greater than the shear strength of first s