Title:
ACTUATOR FOR UNDERGROUND DEVICE
Document Type and Number:
Japanese Patent JPS6237495
Kind Code:
A
Abstract:
A subsurface valve-actuator combination (13) 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 (72) in the battery-actuator circuit maintains a switch (74) closed to permit the latch to be energized as long as the receiver-relay receives an electromagnetic signal transmitted from the earth's surface. The latch is deenergized upon interruption of the signal and/or if the battery power is insufficient to energize the same.
Inventors:
RUISU EICHI ROODEN
TEII CHIYAARUSU MUUA
TEII CHIYAARUSU MUUA
Application Number:
JP10120786A
Publication Date:
February 18, 1987
Filing Date:
May 02, 1986
Export Citation:
Assignee:
DEBERUKO INC
International Classes:
E21B34/10; E21B34/06; E21B34/08; E21B41/00; E21B43/12; (IPC1-7): E21B34/10; E21B43/12
Attorney, Agent or Firm:
Takehiko Suzue