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US 4,378,847 AGranted
Valve
AssigneeOtis Engineering Corporation
InventorsDhirajlal C. Patel, Robert B. Wheeler
Life of this patent
Estimating the term…
Abstract
A method for protecting a well formation during gravel packing in which a back pressure valve is held off of its seat while gravel is being placed in the well, is automatically closed as the wash pipe is removed from the screen and in which the valve is returned to open position by a force exerted from above, either hydraulic or mechanical. A valve is held open by a prop-out which is removable to permit the valve to swing to closed position and thereafter the valve is again opened in response to mechanical or hydraulic force from above.
Claims3
A valve comprising,
- a body having a bore therethrough,
- a downwardly facing shoulder in said body bore,
- a land in said body bore below said shoulder,
- a groove in said body bore below said land,
- an annular valve seat in said body bore having a tubular extension,
- a valve opener telescoped in said tubular extension,
- shear means releasably connecting said tubular extension and valve opener,
- resilient means urging said valve opener upward to hold said valve seat against said downwardly facing shoulder,
- seal means between said valve seat and said land,
- a check valve carried by said valve seat,
- resilient means urging said check valve toward closed position,
- and a prop-out sleeve removably held in said body bore and propping said valve member in open position.
9 more elements
A valve comprising,
- a body having a bore therethrough,
- a valve seat in said bore,
- a check valve rotatable about a pivot and cooperable with said valve seat for preventing flow through said bore from its first end to its second end,
- means urging said check valve toward seating position,
- means including releasable means responsive to a force exerted through the first end of said bore on said check valve seat for moving said check valve to unseated position in response to release of said releasable means,
- a prop-out sleeve removably held in said body bore and propping said valve member in open position,
- seal means between said sleeve and body bore,
- and seal means in the bore through said sleeve for sealingly engaging a wash pipe therein to seal therebetween as the wash pipe is moved upwardly through said sleeve,
- said sleeve having a downwardly facing shoulder for engagement with a boss on the end of the wash pipe to pull the sleeve upwardly with the wash pipe and release said check valve member.
6 more elements
Dependencies are inferred from the claim text.