Wellbore apparatus including a rathole pressure balanced-differe

Wells – Processes – Perforating – weakening – bending or separating pipe at an...

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Details

166 551, 166374, 166386, 166387, 175 452, 175 454, E21B 431185, E21B 3410

Patent

active

051919338

ABSTRACT:
A well apparatus adapted to be disposed in a wellbore includes a perforating apparatus and a packer adapted to set and isolate an annulus above the packer from a rathole annulus below the packer, the perforating apparatus including a new and novel rathole differential pressure balanced firing system where the firing system includes a ball release sleeve holding a firing piston, means for initially opening a top end and a bottom end of the ball release sleeve to the rathole annulus below the packer; and a plurality of sequentially operable hydraulic systems, the top end of the ball release sleeve being initially open to the rathole annulus below the packer but being subsequently closed to the rathole annulus below the packer and then reopened to the annulus above the packer when the packer is set. When the top end of the ball release sleeve is opened relative to the annulus above the packer and the significant pressure is applied to the annulus above the packer, the ball release sleeve releases the firing piston; as a result, since the firing piston is released, the firing piston drops and impacts a primer, the impact of the firing piston on the primer detonating the perforating apparatus.

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PCT System-Sleeve Type, A page from a book dated Jan. 1987 disclosing a hydrostatic reference tool having a pressure reference feature.

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