Product features

Application

The long stroke unit is a rugged stationary vertical structure utilizing a gear reducer to  operate a lower sprocket connected to a chain and an internal sliding traversing mechanism.  This mechanism drives the vertical and horizontal movement of a counterweight box -- up and  down inside the long stroke tower. The counterweight is connected to a heavy-duty woven belt  carcass which connects to a sucker rod positive displacement lift system. 

As such, it provides a longer and slower stroke that reduces pump cycles while producing  higher pump fill age rates per stroke and higher volumetric efficiency.

Features and Benefits

▶ The Long pumping unit enables the transition to reciprocating rod-lift earlier in the  production life cycle

▶ Unit arrives at the wellsite 90% preassembled for quick setup  

▶ Efficient unit geometry requires less torque and reduces power usage by 15 to 40% 

▶ Speed sentry monitors and records all pumping events 

▶ Platform and rear-access doors above the gear reducer provide access away from the load  belt for efficient maintenance 

▶ Platform kick plates and grate prevent dropped objects and slips 

▶ Ladder system enables easy access to critical components Large maintenance doors  eliminate confined space issues and enable simplified maintenance; large front platform  enables easy access to load counterweights. 

▶ Integrated hydraulic rollback system moves the unit at least 12 ft (3.6 m) away from the  wellhead for easy access to the well 

▶ Monitoring system analyzes unit vibration, belt tracking, rod load, and rod position with  parameter-based alarm and shut-down capabilities

Pumping Unit Description

▶ Field proven mechanical reversing mechanism ensures safe and reliable operation. 

▶ Long stroke and low SPM to achieve high pump efficiency by fewer cycles. Up to 366-inch  stroke length leads to high pump fill age and less operational costs. 

▶ Fewer cycles mean less energy consumption, less wear on production strings and less down  time. 

▶ Long stroke and virtually no minimum speed help reduce lower dynamic loading significantly.

▶ The short radius of the torque arm reduces required torque demand and allows the use of a  smaller prime mover and gear reducer, which can cut down energy costs by 10% to 30%  compared to other artificial lift systems.

Standard Features

All long stroke pumping units include the following as standard equipment: 

▶ Speed sentry to safely monitor for overspeed, load violations, and more 

▶ High efficiency and dependable electric motor 

▶ System-performance sensors, including upper- and lower-proximity switches, vibration  sensor, belt-alignment sensors, and a load cell 

▶ Integrated hydraulic rollback system enables easy access to the wellhead 

▶ Emergency braking system 

▶ Wire-mesh safety fence 

▶ Front wind-shear panels 

▶ Belt-guide wheels

Optional Equipment

All long stroke pumping units can be optionally equipped with the following: 

▶ Variable-speed drive (VSD) controls speed throughout the stroke cycle to optimize downhole  plunger travel and increases production rates by 20% 

▶ Complete wiring and quick connectors link the unit, junction box, and speed sentry to enable  a plug-and-play pumping unit 

▶ Rod-rotator trip device

Speed sentry

▶ Over speed detection 

▶ Vibration detection 

▶ Rod pump control (RPC) pause and fault 

▶ VSD pause and fault 

▶ Emergency stop 

▶ High and low load shutdown 

▶ Operator defined faults (2) 

▶ Multiple restart options after power loss 

▶ Recognizes loss of load cell signal 

▶ Belt tracking