the vent assembly 14 into a pipe string 38 so that a perforating or jet gun 42 or the like can be run downhole into the borehole 10 and positioned adjacent to a hydrocarbon containing formation 43 shown in fig2 when it is desired to complete the well fig3 and 6 disclose some additional details of the before mentioned packer actuated vent assembly 14 of the present invention as seen in fig3 together with fig4 6 upper edge portion 31 of the outer barrel 30 of the vent assembly 14 is threadingly engaged with the lower end of the packer body 20 of the retrievable packer 12 the packer often includes a j latch 46 as is known to those skilled in the art j latch 46 is used to hook on and set packer 12 an axial passageway 48 extends centrally through the outer barrel 30 the mandrel extension 36 is concentrically arranged with respect to the outer barrel 30 and forms an annular area 52 therebetween ports 54 are formed within the sidewall of the mandrel extention 36 and provide a flow path along which fluid can flow from the annulus 52 into the interior of the mandrel extension 36 and vice versa o rings 56 and 58 are spaced from one another along alternate sides of ports 54 and are housed in grooves which circumferentially extend about the mandrel extension 36 a slidable valve element 60 has an inside surface area made in close tolerance slidable relationship with respect to the outer circumferentially extending sealing surface 62 of the mandrel extension 36 as best seen illustrated in fig6 the sealing surface 62 preferably.