Buoyancy assist tool with annular cavity and piston
AssigneeHalliburton Energy Services, Inc.
InventorsMin Mark Yuan, Lonnie Carl Helms, Mayur Narain Ahuja, Ishwar Dilip Patil, Frank Vinicio Acosta, Clayton Reed Bonn
Life of this patent
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Abstract
A downhole apparatus comprises a casing string with a removable plug therein to block flow therethrough. A flow barrier is positioned in the casing below the removable plug and the removable plug and the flow barrier defining a buoyancy chamber therebetween. A debris barrier positioned above the removable plug comprises a rigid annular ring with a flexible diaphragm covering the center opening defined by the annular ring.
Claims20
A downhole apparatus comprising:
- an outer case defining an annular cavity in a wall thereof, the annular cavity having an upper end and having a lower end;
- a plug housing connected in the outer case, the plug housing and outer case defining an annular space therebetween;
- a degradable plug fixed in the plug housing;
- a piston slidably and sealingly disposed in the annular cavity, the annular cavity containing a degrading fluid;
- and
- a rupture disk disposed in a port in the wall of the outer case, the annular cavity being communicated with the port, the rupture disk being rupturable upon downward movement of the piston in the annular cavity.
A downhole apparatus comprising:
- a casing string;
- an outer case connected in the casing string, the outer case defining an annular cavity filled with a degrading fluid in a wall thereof;
- a rupture disk positioned in a port in the outer case, the annular cavity fluidicly fluidically connected to the port;
- a plug housing connected in the outer case, the plug housing and outer case defining an annular passage therebetween, the port being in communication with the annular passage;
- a degradable plug fixed in the plug housing;
- a piston sealingly received in the annular cavity, the piston configured to move downwardly in the annular cavity to burst the rupture disk upon the application of fluid pressure in the casing thereabove.
A downhole apparatus comprising:
- a casing;
- a flow barrier connected in the casing;
- and
- a buoyancy assist tool connected in the casing above the flow barrier, the buoyancy assist tool and flow barrier defining a buoyancy chamber therebetween, the buoyancy assist tool comprising:
- an outer case connected at upper ends and lower ends in the casing;
- a degradable plug positioned in the outer case to block flow therethrough;
- an annular cavity filled with a degrading fluid defined in a wall of the outer case and configured to communicate fluid to the degradable plug upon the application of a predetermined pressure thereto;
- and
- a piston sealingly received in the annular fluid filled cavity and movable downward therein upon the application of fluid pressure in the casing, the downward movement of the piston urging the fluid from the annular cavity into the degradable plug.
Dependencies are inferred from the claim text.