Subsurface device actuators

Details Subsurface device actuators Subsurface device actuators

E - Fixed Constructions

21

B

342/2, 166/41

E21B 34/10 (2006.01) E21B 34/06 (2006.01) E21B 34/08 (2006.01) E21B 41/00 (2006.01)

Patent

CA 1276874

IMPROVEMENTS IN SUBSURFACE DEVICE ACTUATORS ABSTRACT OF THE DISCLOSURE A subsurface valve-actuator combination for well production tubing is described. The valve is urged to closed position but held open by a battery-operated latch of the actuator. A receiver- relay in the battery-actuator circuit maintains a switch closed to permit the latch to be energized as long as the receiver-relay receives an electro- magnetic signal transmitted from the earth's surface. The latch is deenergized upon interruption of the signal and/or if the battery power is insuffi- cient to energize the same.

508257

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