Method and apparatus for controlling borehole pressure in perfor

Details Method and apparatus for controlling borehole pressure in perfor Method and apparatus for controlling borehole pressure in perfor

1984-10-15

1986-08-12

Novosad, Stephen J.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

With wall engaging packer or anchor

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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