| 摘要 |
An intermittent well controller is disclosed. In the preferred and illustrated embodiment, the controller, in conjunction with sensors indicative of well conditions, controls the delivery of lifting gas to the well. The controller is intended to be installed at a remote location where the equipment is normally provided with no commercially available electrical power and is battery operated. The battery operated controller is normally switched off nearly all the time. Moreover, the controller incorporates a battery sensitive indicator which signals an alarm in the event that terminal voltage of the battery cells drops below a specified level to provide a warning for service personnel on their next trip to the well that the batteries should be replaced. Further, the device utilizes a computer with a memory not subject to erasure when the equipment is switched off. The device is cycled on for a short interval of time, typically just a few microseconds. The duty cycle is thereby far less than 1%. It is cyclically switched on to test for a change of conditions at a timed rate. Moreover, the device utilizes a two-way three port solenoid operated non-return pilot valve with detent action so that the valve is operated only by a short pulse, and does not require the continuous application of power. The valve maintains the last achieved position.
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