Features of the ePAC™ Vector Flux Drive Rod Pumping System

Cost Saving Features

As a result of more efficient use of electrical power the use of an ePAC drive will significantly reduce the lift cost per barrel of fluid produced to surface as well as reducing maintenance costs for the primary method of artificial lift. The high efficiency operation of the pumping unit can limit the amount of stress placed on the rods during normal operations and as a result of this can significantly reduce the number of repairs required during the life of the rod pumping system.

• Uses high efficiency (92% - 96%) standard motors in place of low efficiency (82% - 86%) high slip motors
• ePAC drives incorporate unique design features that reduce electric utility costs and improve power quality.
• The drives provide near-unity power factor at all speeds and loads, to avoid utility power factor penalties.
• Gearbox torque limiter protects the gearbox from excessive torque loads, reducing the possibility of gearbox damage.
• Rod force limiter reduces the possibility of rod part.
• Eliminates the high in-rush currents of across the line motor starting.
• Smoothes energy consumption by reducing excessive rod forces and counter balance errors.

Performance Features

The ePAC drive is designed to operate with 230, 380, 460, or 575 Volt 50/60 Hz power sources. Units are also available for operation from single-phase power lines.

• Minimum fill controller provides simple pump off control of wells with poor inflow characteristics.
• Gearbox ratio monitor automatically computes the overall ratio between the motor and crankshaft with each stroke of the pump.
• Pump speed monitor provides instantaneous and average pump speeds.
• Independent operator-adjustable up and down stroking speed set points.
• Set point speed based on pump fill and feed back from the beam position sensor, that senses the direction of the polished rod.
• Internal limit switch provides adjustable crank angle points for changing pump upstroke, downstroke, and cornering speed on Rotaflex jack pumps.
• Integral tracker system controls separation of the bridle from the sucker rod.
• Pump fill optimizer maximizes well production and eliminates fluid pound by independently adjusting up and down stroke speeds.
• Heavy-gauge Nema 3R enclosures seal the ePAC drive electronics from environmental factors such as sand, moisture, and small organisms.
• Optional graphic display for viewing real-time surface and pump cards.