Halliburton Company

Bernard L Hackney

Burchus Q Barrington

Robert T Evans

A bridge plug apparatus includes a mandrel assembly having an operating fluid passageway disposed therein. A releasable coupling assembly has an upper end adapted to be connected to a tubing string and has a lower portion adapted to be releasably connected to the mandrel assembly. An annular packer is disposed about the mandrel assembly. A mechanical first slip assembly is connected to the mandrel assembly below the packer. A hydraulic second slip assembly is connected to the mandrel assembly above the packer. A power piston is disposed about the mandrel assembly for longitudinally compressing and radially expanding the packer to seal the packer in response to an increase in fluid pressure within the operating fluid passageway of the mandrel assembly. A hydraulically actuatable releasing device is provided for releasing a latched connection between the coupling assembly and the mandrel assembly. This releasing device is defined upon a power sleeve slidably disposed about the mandrel assembly. This power sleeve also has defined thereon a first valve portion for closing a bypass passage of the mandrel assembly and a second valve portion for trapping fluid under pressure within a portion of the operating fluid passageway of the mandrel assembly communicated with the hydraulic second slip assembly and the power piston.

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Pearland, TX, United States of America

Bernard L Hackney