초록 ▼

An apparatus and method for removing a frangible rupture disc or other frangible device from a wellbore casing. The casing has a special casing section defining a plurality of holes therethrough. Rupturable glass ceramic discs or inserts are disposed in the holes and retained therein. The glass cera

An apparatus and method for removing a frangible rupture disc or other frangible device from a wellbore casing. The casing has a special casing section defining a plurality of holes therethrough. Rupturable glass ceramic discs or inserts are disposed in the holes and retained therein. The glass ceramic discs or inserts are adapted to withstand fluid differential pressure normally present in the wellbore but are rupturable in response to impingement by a pressure wave thereon. The pressure wave is provided by a pressure wave generating device positionable in the casing string adjacent to the holes in the special casing section. The pressure generative device may generate a pressure pulse or an acoustical wave. Methods of perforating a well casing using a pressure pulse or an acoustical wave are also disclosed.

대표청구항 ▼

1. An apparatus for use in a wellbore comprising:a casing string positionable in the wellbore and having a casing section defining a plurality of holes through a wall thereof; rupturable plug means disposed in each of said holes in said casing section wherein said rupturable plug means are ruptured

1. An apparatus for use in a wellbore comprising:a casing string positionable in the wellbore and having a casing section defining a plurality of holes through a wall thereof; rupturable plug means disposed in each of said holes in said casing section wherein said rupturable plug means are ruptured allowing communication between said casing string and the wellbore in response to impingement by a pressure wave without damaging areas outside said casing string; and a pressure wave generating device for generating said wave, said pressure generating device being separate from said casing string and positionable therein after said casing string is positioned in the wellbore.