Removal of downhole ferromagnetic disk
AssigneeSaudi Arabian Oil Company
InventorsAbdulrahman Al Ahmari, Mohammed Al Dabbous
Life of this patent
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Abstract
A ferromagnetic disk is removably installed in a wellbore. The disk can be installed in the wellbore during oil and gas well completion and production activities to maintain pressure within the wellbore and then can be dislodged. More specifically, a strong magnet is installed within a magnetic tool to dislodge and remove a ferromagnetic disk without breaking the disk. The strong magnet can be a neodymium magnet, electromagnet, or other types of strong magnets.
Claims19
A method of dislodging a ferromagnetic disk removably installed in a wellbore having a wellbore environment, the method comprising the steps of:
- lowering a magnetic tool down the wellbore, the magnetic tool comprising a strong magnet operable to removably attach to the ferromagnetic disk with a magnetic force;
- attaching the strong magnet to the ferromagnetic disk with the magnetic force, the ferromagnetic disk comprising a core and a coating, the core comprising iron and the coating comprising a protective coating shielding the core from exposure to the wellbore environment, the ferromagnetic disk operable to maintain a desired wellbore pressure within the wellbore during a wellbore operation;
- and
- applying a force through the magnetic tool comprising the strong magnet, such that the force in combination with a wellbore pressure is operable to dislodge the ferromagnetic disk without breakage, the ferromagnetic disk being removably attached to the strong magnet, such that the desired wellbore pressure is no longer maintained by the ferromagnetic disk and the ferromagnetic disk is recoverable from the wellbore in an unruptured state.
A system for removing a ferromagnetic disk removably installed in a wellbore having a wellbore environment, the system comprising:
- the ferromagnetic disk operable to maintain a desired wellbore pressure within the wellbore during a wellbore operation, the ferromagnetic disk comprising a core and a coating, the core comprising iron and the coating comprising a protective coating shielding the core from exposure to the wellbore environment;
- a magnetic tool comprising a strong magnet, the magnetic tool attached to a surface link, wherein the strong magnet is operable to generate a magnetic force to attract the ferromagnetic disk without breaking the ferromagnetic disk;
- and
- the surface link operable to raise and lower the magnetic tool in the wellbore, the surface link further operable to apply a force through the magnetic tool such that the force in combination with a wellbore pressure is operable to dislodge the ferromagnetic disk without breaking the ferromagnetic disk such that the desired wellbore pressure is no longer maintained by the ferromagnetic disk.
Dependencies are inferred from the claim text.