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GPL® Gas-Powered Lift

The GPL® gas-powered lift system from Unico combines a power source and advanced well automation control into a compact unit specifically designed for oil and gas production. The unique system provides a fully integrated solution for customers with pumping applications remote from electrical service. The system is easy to install and maintain.

Improves Operations

The GPL® system gives operators a tool to improve their oil and gas production
operations. The unit has been uniquely integrated to optimize well production
while minimizing fuel consumption and maximizing the engine service interval.

Wide Range of Fuels

The system can automatically switch between wellhead natural gas and liquid propane tank fuel sources. Optional equipment allows operation from low-energy wellhead natural gas. This option can eliminate or substantially reduce liquid propane consumption.

Multidrive Operation

A sealed electronic enclosure accepts multiple universal well automation controllers,
each of which can operate a specific type of artificial lift as well as auxiliary motorcontrol operations such as surface pumps. Up to four controllers can be used,
provided the total power requirement does not exceed that of the engine/generator.

Universal Application

Each universal well automation controller can be configured for sucker-rod (SRP),
progressing cavity (PCP), or electric submersible pump (ESP) operation. The well
controller has evolved over thousands of installations into the most advanced
artificial lift automation system available today.

Direct Electric Submersible Pump Operation

ESP systems operated by variable-frequency drives generally require filters to smooth the electrical output and suppress potentially damaging voltage spikes. Most ESP systems also require an output step-up transformer to overcome cable voltage drop in deep wells. The GPL® system includes a unique control option for directly operating ESP systems by coordinating engine speed and generator voltage. The cost and space savings achieved by eliminating the drive, filter, and transformer can be substantial.

Extended Run Life

The engine/generator has been specifically designed for continuous operation
rather than standby. This provides extended service intervals and run life that
substantially exceed other units in the market.

Unattended Operation

Protective features and automatic restart control maximize uptime without pumper
intervention. Starts, stops, faults, warnings, and other events are automatically
logged for analysis.

Remote Monitoring and Control

Optional wireless communication by radio link, cellular phone, or satellite provides
continuous remote monitoring and control of pumping operations using Unico’s
GMC® remote monitoring system. The system provides real-time monitoring,
analysis, reporting, and notification of alarms and other conditions.

Features

Engine/Generator Features

• Specifically designed for continuous operation
• Operation from natural gas or liquid propane
• Operation from low-energy natural gas
• Automatic switchover between wellhead and propane tank
• Integral drip-proof environmental base
• Liquid propane fuel vaporizer
• Fuel conditioning system
• Fuel input pressure monitor
• Fuel-specific engine control
• Induction-hardened intake valve seats
• Sintered powder metal exhaust valve seats
• Durable high-silicon-content pistons
• Heavy-duty deep discharge battery
• Battery power management
• Specially formulated synthetic engine oil
• Increased oil capacity
• Oversize engine air filter
• Enhanced ignition system
• Engine speed optimization
• Integrated lift drive control
• Multidrive configuration
• Drive energy recirculation
• Power demand limiting
• Automatic shutdown protection and engine restart
The operator interface features
a graphical displayGas-Powered Lift System

Drive Control Features

• Improves production, efficiency, and reliability
• Automated system parameter identification
• Density and flow loss calculations from fluid and gas properties
• Manual, preset, and remote speed control
• Pump flow monitor and production accumulator
• Casing and tubing pressure compensation
• Pump intake and discharge pressure monitors
• Fluid level monitor and control
• Input power meter and energy efficiency monitor
• Input, motor, and lift power monitors
• Power and torque smoothing control
• Automatic restart from faults and fuel outages
• Time-stamped event, warning, and fault logging
• Motor voltage, current, and frequency monitors
• Pump speed optimization
• Gas interference monitor
• Sensorless fluid level and fluid flow estimation
• Optional casing and tubing pressure sensor inputs
• Extend range operation to twice base speed
• Standard ANSI and Modbus RTU serial communications
• User-programmable multichannel data sampler
• Optional ControlNet, Modbus Plus, Profibus, and Ethernet
• Optional 900 MHz and 2.4 GHz wireless communications
• Optional interface for multichannel analog data logging
• Optional 1 gigabyte mass storage memory
• Windows computer, iPhone, and iPad interface software 
• User-programmable Excel spreadsheet report generator software

Solutions

Electric Submersible Pump (ESP) Systems

• Embedded tubing, casing, and ESP models
• Downhole motor/pump speed monitor and limiter
• Optional downhole pressure and surface flow sensor inputs
• Programmable pump-off control
• Casing and tubing pressure compensation
• Pump differential pressure monitor and limiter
• Embedded drive, transformer, and cable models
Progressing Cavity Pump (PCP) Systems
• Embedded rod, tubing, casing, pump, fluid, and reservoir models
• Pump speed and power flow optimizers 
• Coordinated dual motor control for large pumps
• Motor and rod speed monitors and limiters
• Motor and rod torque monitors and limiters
• Downhole pump speed and torque monitors
• Optional downhole pressure and surface flow sensor inputs
• Pump differential pressure monitor and limiter
• Dual speed pump-off control prevents sand-in
• Low torque and speed fault detection

Progressing Cavity Pump (PCP) Systems

• Embedded rod, tubing, casing, pump, fluid, and reservoir models
• Pump speed and power flow optimizers 
• Coordinated dual motor control for large pumps
• Motor and rod speed monitors and limiters
• Motor and rod torque monitors and limiters
• Downhole pump speed and torque monitors
• Optional downhole pressure and surface flow sensor inputs
• Pump differential pressure monitor and limiter
• Dual speed pump-off control prevents sand-in
• Low torque and speed fault detection

Sucker-Rod Lift Systems

• Embedded rod, tubing, casing, pump, pumping unit, fluid, and reservoir models
• Conventional, phased crank, beam balance, and air balance geometries
• Mark II, Reverse Mark, and Rotaflex geometries
• Rod string weight and resonance calculator
• Deviated well compensation
• System simulation mode
• Pump speed and power flow optimizers 
• Extend range operation to twice base speed
• Single-, dual-, or triple-speed operation or continuously variable optimize mode
• Rotaflex racetrack mode with automatic cornering control
• Soft landing feature to eliminate fluid pound effects
• Programmable crank angle speed-change set points
• Motor voltage, current, speed, and torque bar graph meters
• Gearbox torque monitor and limiter
• Counterbalance monitor and assistant (SRP and HRP™ systems)
• Crank angle and speed monitors
• Operates without rod load and position sensors
• Optional load cell and inclinometer inputs
• Pump fill monitor and optimizer
• Dual speed pump-off control prevents sand-in problems
• Motion profile optimizer to reduce gas interference
• Downhole pump position, velocity, and load monitors
• Rod position and velocity monitors
• Rod load monitor and limiter
• Rod power monitor
• Rod/pump friction monitor
• Actual surface and pump dynamometer graph generators
• Predicted surface and pump dynamometer graph generators
• Stored surface and pump dynamometer graphs
• Automatic rod friction compensation
• Bridle separation monitor and minimum rod load control
• Belt-slip monitor and diagnostic alarm (SRP systems)