| 摘要 |
PURPOSE: A pump-off controller for beam typed pumping unit is provided to draw an oil well production fluid from a base rock layer underground for shutting off in case of a low production fluid of the oil well. CONSTITUTION: The operation of an oil well pumping unit control system (20, 200) is governed by a computerized automated control unit (88) that receives flow rate measurements from a Coriolis flow meter (28). The control unit causes production from a beam pumping unit (22) to cease when measurements from the Coriolis flow meter indicate a decline in the pump efficiency. The decline in pump efficiency indicates that a production fluid level (136) in the production tubing (108) has fallen below the uppermost point of travel for the pump plunger (122). Production from the well is, accordingly, shut-on to afford the reservoir sufficient time to build the pressure and corresponding fluid level that is required to recommence production operations.
|
