Method and apparatus for controlling borehole pressure in perfor

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With wall engaging packer or anchor

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166 55, 166297, 166317, 166386, E21B 4311, E21B 4766

Patent

active

046050744

ABSTRACT:
A method and apparatus for controlling pressure in a borehole during perforation to provide means for maintaining a fluid column above the perforating zone to control a blowout while isolating the perforating zone from such fluid column to prevent incursion of the fluid column into the perforated zone immediately upon perforation. Provision is also made for a low pressure zone for inducing flow from the formation into the wellbore immediately upon perforation.

REFERENCES:
patent: 2330509 (1943-09-01), McCullough
patent: 3163112 (1964-12-01), Rhea
patent: 3305018 (1967-02-01), White, Jr. et al.
patent: 3385364 (1968-05-01), Whitten

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