Lufkin Progressive Cavity Pump Controller
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Product Overview and Features
Optimize Fluid Production While Protecting Your Pump
The Lufkin Progressive Cavity Pump (PCP)
Controller works in conjunction with a
variable speed drive (VSD)
to optimize fluid production while protecting the pump.
The patented control algorithm varies the speed of the pump while
measuring the amount of fluid production from the pump. The
controller ramps up the pump speed in user-defined steps, measuring
production rate at each step and establishing a speed/rate
relationship. At the point that a step increase in speed does not
produce the proportional step increase in fluid production rate, the
controller starts to slow the speed by steps until a reduction in
fluid production rate is measured. The control algorithm
continues to test the optimum production rate by repeating the speed
increase/decrease sequence.
Secondary control algorithms monitor
-
A torque signal from the variable speed drive
-
Pump shaft RPM as indicated by a Hall Effect
transducer
sensing a magnet mounted on the drive shaft
-
Low/high fluid rate limits.
All of these secondary control features slow the
pump in the event of a violation of the set limit points. If the
monitored variable continues to be in an alarm condition when a
programmed minimum speed is reached, the PCP will stop the well
to prevent damage to pumping equipment.
Production measurement options supported by the PCP includes
Field-proven to maintain peak production and
prevent pump damage.
“First time I’ve seen…unit effectively control a PCP
well.”
“Keeps the well pumped off constantly and in turn
gives maximum production.”
“No excessive wear on pump seen to date.”
Historical records of the previous 1500 one-minute
samples are maintained for process variables including production
rate, speed output to the VSD, actual measured speed of the pump
shaft, torque and power signals from the VSD. A 60-day record
of production totals for the day is also stored in the PCP.
The PCP uses modbus-based communication protocol, and also
offers the advantages of the Extended Lufkin Automation Modbus
(ELAM) protocol to those SCADA software packages that go beyond the
limitations of conventional modbus. All of the configuration,
status and historical data available at the local keypad interface
are available via data telemetry link to SCADA software. The
PCP operates on the Lufkin Automation Lufkin Well Manager hardware
platform, reducing the number of spare parts to keep on hand,
simplifying training, and giving you a single source for rod pump,
injection well, and progressing cavity pump automation.
