Single acting subterranean well valve assembly with conduit flui

Wells – Means for forming filter beds

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Details

166317, 166326, 166373, E21B 3412, E21B 4304

Patent

active

044237731

ABSTRACT:
A formation protection valve is normally held in an open position relative to an annular elastomeric valve seat by an inserted wash pipe during performance of a gravel packing operation in a subterranean well. Upon removal of the wash pipe, a valve head swings downwardly to a sealing position on an annular elastomeric valve seat. A valve seat support structure is mounted below the annular valve seat to provide support of the inner periphery of the annular valve seat against downward fluid pressure forces exerted on the valve head. The elastomeric valve seat is shearable by a subsequently inserted tubing string, which also effects the displacement of the valve seat support structure to a radially outwardly disposed position wherein it no longer interferes with the passage of the tubing string therethrough.

REFERENCES:
patent: 2101640 (1937-12-01), Chonette et al.
patent: 2187487 (1940-01-01), Burt
patent: 2651369 (1953-09-01), Abendroth et al.
patent: 2652117 (1953-09-01), Arendt et al.
patent: 3062284 (1962-11-01), Brown
patent: 3421586 (1969-01-01), Solum
patent: 3957114 (1976-05-01), Streich
patent: 4122898 (1978-10-01), Nelson

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