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US 5,180,007 AGranted
Low pressure responsive downhold tool with hydraulic lockout
AssigneeHalliburton Company
InventorsKevin R. Manke, Paul D. Ringgenberg, Roger L. Schultz
Life of this patent
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Abstract
An annulus pressure responsive well tool includes a selectively actuatable hydraulic bypass for bypassing a pressure differential across a power piston of the tool so that an operating element associated with the power piston will remain in a chosen position during a subsequent change in well annulus pressure.
Claims19
An annulus pressure responsive tool apparatus, comprising:
- a tool housing;
- a power piston slidably disposed in said housing;
- a first pressure conducting passage means for communicating a well annulus with a first side of said power piston;
- a second pressure conducting passage means for communicating said well annulus with a second side of said power piston;
- retarding means, disposed in said second pressure conducting passage means, for delaying communication of a sufficient portion of a change in well annulus pressure to said second side of said power piston for a sufficient time to allow a pressure differential between said first side and said second side of said power piston to move said power piston relative to said housing;
- an operating element operably associated with said power piston for movement with said power piston between a first position and a second position of said operating element;
- and
- selectively actuatable bypass means for communicating said first and second passage means and thereby bypassing said power piston so that said operating element will remain in one of its said first and second positions during a subsequent change in said well annulus pressure
5 more elements
A method of operating an annulus pressure responsive downhole tool, said method comprising the steps of:
- running said tool into a well with an operating element of said tool in a first position;
- (b) increasing well annulus pressure to at least a first level above hydrostatic well annulus pressure and communicating said increase to a first side of a power piston of said tool while delaying communication of said increase to a second side of said power piston for a sufficient time to move said power piston and to thereby move said operating element to a second position;
- (c) opening a bypass past said power piston and thereby temporarily deactivating said power piston;
- and
- (d) while said bypass is open, decreasing said well annulus pressure back to hydrostatic well annulus pressure without moving said operating element back to its said first position.
2 more elements
Dependencies are inferred from the claim text.