Wells – Processes – With indicating – testing – measuring or locating
Patent
1994-11-30
1998-10-13
Neuder, William P.
Wells
Processes
With indicating, testing, measuring or locating
166 53, E21B 4300
Patent
active
058198490
ABSTRACT:
A method and apparatus for controlling an artificial lift system is described and claimed. Preferably, the control system includes at least one sensor for detecting at least one mechanical attribute during pumping operations, and a controller for receiving the electrical signal as an input, and analyzing it to determine if a pumped-off condition is occurring. Additionally, the controller member provides command signals to control the prime mover and to suspend operation of the prime mover if it is determined that a pumped-off condition is occurring. The controller maintains the suspension of the prime mover for an idle interval having a duration which is calculated by the controller from (1) at least one preceding pumping interval, and (2) a predefined pump cycle duration. Preferably, the controller operates to maintain a substantially constant and predetermined pumping cycle duration by continuously adjusting the idle interval duration.
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Hunn Melvin A.
Neuder William P.
Thermo Instrument Controls Inc.
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