January 27, 2017
Load Factor is a parameter that can be used to determine when to open a plunger lift well to rise the plunger. It is a ratio of the slug size (casing pressure – tubing pressure) to the lifting pressure (casing pressure – line pressure). It is used by a number of different control systems as a standard optimization setting and was recently added to the ALiEn2 Expert plunger lift controller.
The ALiEn2 Expert plunger lift controller checks to make sure that the load factor is less than a predefined set point (i.e. 50%) before opening the well to rise the plunger. If Load Factor is above the set point, the controller will wait for the pressure to build enough to reduce the Load Factor below the set point. Once the set point is reached, the controller opens the sales valve, allowing the plunger to rise to the surface. The load factor is not checked again until the controller has returned to Close and is ready to once again open to Rise.
The Load Factor feature was recently added to the ALiEn2 Expert controller. If you wish to use this feature, you will require the ETC pressure splitter, 3 pressure transducers, and a special build of firmware that can be downloaded to the controller via Link using Vision. The Load Factor firmware is currently downloaded automatically to Vision.