Patent ID: 6799638
Filing Date: 2004-10-05
Classification: E21B

Abstract:
A well tool for selectively sealing areas within a well tubular comprising:a first axially extending plug adapted to be axially movable within an axially extending well tubular for isolating fluids in first and second areas within said well tubular on either axial end of said first plug, a first outer seal for providing a sliding, sealing engagement between said first plug and an internal surface of said well tubular, an axially extending mandrel extending through said first plug, a mandrel flow passage extending axially through said mandrel, a first inner seal for providing a sliding, sealing engagement between said first plug and said mandrel, a first port extending from said flow passage of said mandrel to said first area, a first movable closure member movable between a closed and an open position for respectively closing said first port when in said closed position or opening said first port when in said open position whereby said first closure member respectively blocks or permits pressure communications between said mandrel flow passage and said first area, a first closure mechanism for moving said first closure member from said closed to said open position, and a first release mechanism responsive to movement of said first closure mechanism for permitting said first plug to be displaced axially free of said mandrel in response to a pressure differential between said first area and said second area.