초록 ▼

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

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 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.

대표청구항 ▼

In a method of controlling operation from a remote control location of a device located downhole in a well, the steps comprising: A. Providing a self-contained source of power at the downhole location of said device; B. Generating a signal at the remote control location indicating the time the devic

In a method of controlling operation from a remote control location of a device located downhole in a well, the steps comprising: A. Providing a self-contained source of power at the downhole location of said device; B. Generating a signal at the remote control location indicating the time the device is to operate downhole in a selected operating state; C. Transmitting the generated signal from said remote control location toward the downhole location of said device; D. Receiving a signal at said downhole location during all of the time said device is to operate is said selected state, said signal causing said operation; E. Directing operation of said device in said selected state during said time, while as said source of power is capable of maintaining a power output greater than a predetermined threshold level; and F. Using a latch to disconnect said device from said power source when a state of said source indicates that said source will not be capable of maintaining a power output greater than a predetermined threshold level.