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Oil & Gas Automation
Solutions
is a publication
of Unico, Inc.

Since 1967

Unico, Inc.
3725 Nicholson Rd.
P. O. Box 0505
Franksville, WI
53126-0505
262.886.5678
262.504.7396 fax
oilgas@unicous.com
unicous.com


Automated Valve Check Keeps Sucker-Rod Pumps Healthy

Unico's sucker-rod pump (SRP) drive now incorporates a revolutionary valve-check feature that diagnoses pump condition without human intervention. The automated feature steps the pumping unit through the necessary motions, including stopping and dwelling during the upstroke and downstroke. After approximately 40 seconds, the drive reports the static leakage rates of the traveling and standing valves as well as the plunger clearance.


The valve check feature gives users the ability to closely monitor the health of their pumps and to quickly identify and repair pump problems. Since valve checks can be done frequently, failures can be detected early to eliminate the costly loss of production and wasted power consumption associated with operating worn or broken pumps. A valve check can be initiated either from the drive's keypad or remotely over a communication link. For added convenience, a software option allows the test to be scheduled automatically at a preset time each day. Head-end well management software can also be programmed to automatically display the results of the valve checks as well as an alert message if pump leakage exceeds a threshold value.

The valve-check feature is yet another example of how Unico's innovation helps you get the most from your artificial lift systems. For more information on the feature, stop by booths #34 and #35 at the SWPSC show or contact us.

Numerous Feature Improvements in Recent Releases of Unico's Sucker-Rod Pump (SRP) Control Software

The following are some of the improvements made through the latest version (.106) of Unico's 805-541 Sucker-Rod Pump (SRP) control software.

Version .106 Improvements
Added automated valve check (see article above)
Added automatic daily production gauging (production recording)
Added last valve check time and date stamp
Added automatic pump clearance identification (during valve check)
Added automatic pump fill trigger determination (determined every stroke)
Added user SPM adjustment
Added a well ID progress bar display
Added analog tubing pressure input support
Added analog casing pressure input support
Added motor peak power monitor and display
Added a cold start current limiter
Added storage of the four latest surface dynamometer cards
Improved the well ID routine for compatibility with gas-powered generator systems
Improved the well ID routine compatibility with HG pump jacks
Improved the well ID routine for symmetrical pumping units
Improved the “calibrate inclinometer” signal
Improved the “counterbalance assist” signal
Improved the gearbox torque limiting (torque limit)

In Future Issues...

Look for the following articles in upcoming issues of Oil & Gas Automation Solutions:

Field tests of methods to eliminate rod pump gas locking and interference
Reducing power consumption and improving power factor of beam pumps
Using a torque economizer mode to improve efficiency and reduce gearbox stress
Detecting stick/slip oscillations that fatigue rod-string couplings and reduce energy efficiency of PCPs
Control options to ride through power disturbances

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