ePAC™ Vector Flux Drive Rod Pumping System

Weatherford’s ePAC drive is specifically designed for oilfield pumping applications. The ePAC system offers performance enhancement beyond that of conventional variable frequency or variable speed drives as it incorporates Flux Vector Drive (VFD) technology for the precision control of both speed and torque. This improved control can aid the optimization of electrically driven artificial lift systems.

The ePAC VFD has a proven track record of performance enhancement with traditional pump jacks and long-stroke pumping units such as the Weatherford Rotaflex. The ongoing development, deployment, and enhancement of VFD technology can result in a higher economic return from the operation of rod pumped wells.

ePAC Vector Flux Drive Rod Pumping System Highlights

• Reduces power consumption
• Minimizes mechanical stress on equipment
• Eliminates excessive rod force
• Uses pump fill algorithms to optimize production
• Maximum torque from 0 to base speed
• Does not require external load cell input
• Adjustable dynamic braking
• Independent up and down stroke speed

Why use anePAC Vector Flux Drive Rod Pumping System?

Weatherford’s ePAC drive can be used to improve pump performance and well productivity in most oilfield rod pumping applications. The advanced control algorithm can increase productivity and extend the life of both new and existing artificial lift systems.

The ePAC drive is able to deliver this functionality by providing precise control of motor voltage, current, speed, and torque. This provides continuous monitoring of operational parameters and allows the ePAC drive to quickly adapt to dynamic downhole conditions at all speeds.

The ePAC VFD can further aid optimization by:

• Automatically adjusting speed to match well inflow performance
• Offering infinite speed control
• Providing independent up/down stroke speeds
• Reducing total rod pumping system power consumption
• Reducing rod parts
• Offering a 20% increase in SPM over conventionally controlled units (Rotaflex)
• Utilizing an integral tracker system that controls bridle separation from the sucker rod

The ePAC drive overcomes the inefficient production problems found with the traditional control systems used for slow pumping in heavy oil applications. Precise torque and speed control allow the system to operate at all speeds while offering protection to the system.