Patent ID: 6012528
Filing Date: 2000-01-11
Classification: E21B

Abstract:
A method of retrieving a sealing element in a cartridge from an undersea blowout preventer comprising the steps of:a. lowering a retrieving tool within a retrieving cylinder mounted on the end of coiled tubing to the blowout preventer, the retrieving cylinder enclosing an intermediate cylinder terminating in a collet having expandable fingers, the retrieving cylinder further enclosing an expander coaxial with the retrieving cylinder and the intermediate cylinder;b. pressurizing the coiled tubing providing pressure to an interior bore of the expander, thereby driving the intermediate cylinder into abutting contact with the cartridge;c. closing off the interior bore of the expander, thereby driving the expander down into the collet and expanding the fingers into contact with the cartridge; andd. maintaining pressure on the coiled tubing to withdraw the cartridge from the blowout preventer into the retrieving cylinder.