| 摘要 |
A pump off control apparatus for a pump assembly located downhole in a wellbore. The control apparatus prevents the pump motor from running for a finite time interval whenever a pump off condition is encountered. When the apparatus is energized, the downhole pump motor is started, and production normally occurs within a short interval of time, otherwise the pump is automatically shut down for a long time interval, and then another attempt is made to produce the well. When proper flow conditions are achieved within the predetermined short time interval, the control continues to monitor the flow and maintain the downhole pump energized until the well is pumped down and a pump off condition is encountered. The pump off condition is sensed by a flow switch interposed in the production line which senses a condition of inadequate flow and causes the circuitry to shut down the production pump for the long time interval.
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