Subsurface well safety valve and control system

Details Subsurface well safety valve and control system Subsurface well safety valve and control system

1984-03-02

1986-10-28

Leppink, James A.

Wells

With electrical means

166332, 251 11, E21B 3406

Patent

active

046193200

ABSTRACT:
Subsurface safety valve assembly (16) for oil wells comprising a valve element (57) and a temperature responsive operator comprising multiple coil springs (69, 70), made of shape memory material, operable in opposing directions for opening and closing the valve element and a ratchet locking mechanism comprising wickers (79) for locking the valve in its open position after removal of the heating which causes shape memory effect movement to such position.

REFERENCES:
patent: 1880778 (1932-10-01), Byers
patent: 1961280 (1934-06-01), Crites et al.
patent: 3120267 (1964-02-01), Bayless
patent: 3179911 (1965-04-01), Schmitt
patent: 3456722 (1969-07-01), Cornelius
patent: 3716101 (1973-02-01), McGowen, Jr. et al.
patent: 3739845 (1973-06-01), Berry et al.
"Shape-Memory Alloys", by L. McDonald Schetky, Scientific American, vol. 281, pp. 74-82, Nov. 1979.

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