Wells – Processes – Graveling or filter forming
Patent
1982-11-08
1983-12-13
Purser, Ernest R.
Wells
Processes
Graveling or filter forming
166188, 166133, E21B 3708
Patent
active
044200412
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.
REFERENCES:
patent: 3126963 (1964-03-01), Graham
patent: 3627046 (1971-12-01), Miller et al.
patent: 3749119 (1973-07-01), Tausch et al.
patent: 3826309 (1974-07-01), Tausch
Bui Thuy M.
Otis Engineering Corporation
Purser Ernest R.
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