PCP Drives and Automation
Precision torque and speed regulation with sensor-less fluid level control, rod-string over-torque protection, backspin control, and power-loss ride-through for any type of motor including surface and downhole PM.
Unico’s PCP variable speed drives provide precision control of all traditional and PM motor designs. The packaging is rugged for hostile outdoor environments. Features include tandem motor operation, patented power disturbance ride-thru (micro-cut and long duration), closed-loop speed and torque regulation, flux vector control, sensor-less fluid level estimate and control, rod over-torque protection, and sophisticated downhole modelling to allow the user to see inferred downhole pump torque and speed for enhanced diagnostics.
Our PCP drives are cost-effective, flexible, feature-rich, and easy to use.
Overview
Features
Literature
Overview
Multiple Constraint Optimization
At any instant during the life of a well, there is a single constraint that limits production. Production can be maximized without compromising efficiency or reliability by forcing the system to operate at the constraint limiting production at each instant of time. Determining the applicable limits and moving smoothly between them in real-time is a key advantage of the Unico System. Models of all the system elements are run in real-time at the wellhead to detect appropriate limits and enforce associated control strategies. At different points in time, the system may be limited by motor voltage, motor current, motor speed, motor torque, motor thermal capacity, power demand, rod string torque, flow line pressure, fluid level, or well inflow. Multiple constraint optimization is particularly beneficial in applications with variable inflow conditions, such as those found in coal-bed methane, high gas/oil ratio, and thermally stimulated wells.
Sophisticated Modeling
Embedded mathematical models of the drive, motor, drive head, rod string, pump, flow line, tubing, casing, fluid, and reservoir use component specifications and well completion information along with field setup parameters to monitor pumping system operation. Identification routines automatically determine installation-dependent system parameters including those of the motor, rod string, and pump. The models capture the thermal, mechanical, electrical, and hydraulic behavior of the system to control the pumping process with greater precision than ever before.
Sensorless Operation
The drive uses a number of unique methods for precisely determining performance parameters from models of the pumping system elements without requiring external surface or downhole sensors. Sensorless system variables including rod speed, rod torque, pump speed, pump torque, fluid flow, fluid level, suction pressure, discharge pressure, and differential pressure can be observed through the drive keypad/display or recorded as circle charts and time-based plots. Fluid level, pump flow, and total production are displayed in selectable engineering units.
Pump Speed Control
The drive provides a number of options for manual, remote, and automatic control of pump speed. Speed commands can be selected from a number of sources including potentiometer adjustments, keypad presets, serial data communications, and internal optimization controllers. The motor can be operated up to twice base speed at constant power. This allows the overall gear ratio to be increased, thereby providing increased low-speed torque without loss of maximum pump speed. Dual motors can be controlled from a single drive for the operation of large pumps. The system can be configured for optimization of fluid production, gas production, energy efficiency, and/or power flow.
Production Optimization
Level control maximizes fluid production by regulating the downhole pump inlet pressure. An optional surface flow sensor can be used to automatically locate the point of maximum production while protecting the system from a pump-off condition. A search routine uses an optional gas flow sensor input to automatically select the fluid level that maximizes gas production in coalbed methane pumping applications. Current limit control increases production by raising motor speed during periods of reduced pump load. A power flow optimizer maximizes production from gassy wells by allowing the drive and motor to operate at their maximum thermal capacities.
Pump-Off Control
Pump-off control maximizes well production for any given inflow characteristic. Fluid level over the pump intake is precisely controlled by differential sensing of casing gas and pump intake pressure. A pump-off control allows the pump to dwell for a programmable period of time to protect the pump and to control average flow. A dwell period minimum pump speed can be used to prevent sanding in the well.
Production Monitors
A pump flow monitor provides a continuous estimate of flow without the need for additional instrumentation. Pumping speed and pump effective volume are used to estimate the actual production rate. Pump flow is totaled in a resettable production accumulator. Estimated well production is displayed for the operator and is available for remote well monitoring through a serial communication port.
Fluid Level Monitor
A fluid level monitor provides a continuous estimate of level from pump head, fluid properties, tubing pressure, and casing pressure. Tubing and casing pressures can be entered as parameters for relatively fixed pressures or input from analog sensors for significantly variable pressures.
System Protection
Torque limiting protects the motor from excessive torque loads and the rod string against breakage. Stick-slip oscillation damping reduced rod string fatigue failures. Excess flow line pressure can be used to prevent damaging pump loads. Low-speed detection protects the system in case of a stall condition, such as a stuck pump or blocked flow line. Breakaway torque detection identifies pump problems during starting. Low torque detection indicates a rod break, belt failure, or plugged sand screen. Sensing of pump inlet and outlet differential pressure is used to protect the pump from overloading.
Automatic Restart
The drive can automatically recover from fault conditions and intermittent power outages to ensure continuous operation of unattended wells. Auto-restart control sequences starting of multiple pumps after power outages to eliminate surges in power demand. Start/stop events are automatically logged for subsequent retrieval.
Energy Savings
A power flow optimizer reduces the electric utility cost for any inflow rate. A cyclic energy optimizer provides additional utility cost reduction by pumping at the maximum efficiency point necessary to achieve the required flow. Time-of-use control can be used to minimize on-peak energy demand charges. The drive incorporates an input power meter as well as displays of input power, motor power, rod power, pump power, and average efficiency to aid in utility cost control.
Data Capture
A data sampler option captures real-time information for the generation of motor, rod, and pump performance charts as well as plots of production information. A data logger collects time-stamped fault, warning, and event logs that can be viewed through the drive keypad/display, uploaded to a personal computer, or retrieved by a network server. Typical events include start, stop mode change, power up, power loss, overvoltage, overcurrent, low torque, and low speed. A multichannel analog interface option allows data logging of additional well parameters.
Data Communications
Several industry-standard serial protocols are available for communicating with popular programmable controllers as well as personal computers or network servers. Available protocols include Modbus RTU, Modbus Plus, ControlNet, Profibus, and Ethernet. Optional software is available for monitoring the pumping system using an iPhone or iPad handheld device, Windows-based personal computer, or network server. A wireless interface option allows remote monitoring of system performance and control of pump operation. User-programmable reports can be generated using software that connects system parameters to Excel spreadsheets.
Features
Control
Speed References
- Analog potentiometers
- Keypad/display presets
- Serial communications
- Optimization controllers
Speed Control
- Local speed control
- Remote speed control
- Extended speed control
- Fluid level control
- Pump off control
- Gas flow optimizer
Power Control
- Power demand limiter
- Power flow optimizer
- Time of use optimizer
- Cyclic energy optimizer
System Models
- Drive
- Motor
- Drive head
- Rod string
- Pump
- Flow line
- Tubing
- Casing
- Fluid
- Reservoir
Protection
- Motor current limiter
- Motor torque limiter
- Motor thermal limiter
- Rod string torque limiter
- Pump pressure limiter
- Low torque detector
- Low speed detector
Setups
- Motor nameplate data
- Drive head configuration
- Rod string configuration
- Rod string torque limits
- Tubing configuration
- Casing configuration
- Pump characteristics
- Fluid properties
- Reservoir properties
Displays
Motor
- Motor voltage
- Motor current
- Motor speed
- Motor torque
Rod
- Rod velocity
- Rod position
- Rod torque
- Rod load
- Rod friction
Well
- Tubing pressure
- Casing pressure
- Fluid flow
- Fluid level
- Production
- Gas flow
- Gas production
Pump
- Pump velocity
- Pump torque
- Suction pressure
- Discharge pressure
- Differential pressure
Power
- Power meter
- Input power
- Motor power
- Rod power
- Lift power
- System efficiency
Graphics
- Rod velocity
- Rod torque
- Pump velocity
- Pump torque
- Motor voltage
- Motor current
- Motor speed
- Motor torque
Interface
Inputs/Outputs
- Three analog inputs
- Two analog outputs
- Twelve logic inputs
- Six logic outputs
- Optional eight analog inputs
- Optional four analog outputs
Serial Communications
- Local and remote serial ports
- Standard Modbus RTU
- Optional Modbus Plus, ControlNet, Profibus, Ethernet
- Windows, iPhone, or iPad
- Optional 900 MHz and2.4 GHz wireless
Sensor Options
- Fluid flow sensor
- Gas flow sensor
- Suction pressure sensor
- Discharge pressure sensor
- Tubing pressure sensor
- Casing pressure sensor
Literature
Corporate Headquarters
- Unico
- 3725 Nicholson Rd.
- P. O. Box 0505
- Franksville, WI 53126-0505
- 262.886.5678
Join Our Team
- Drop in your resume at –
- hr@wodehousecapital.com
- + 91 22 66336600
Contact Unico Support
Reach us for any enquiry
Disclaimer
Please see our Privacy Policy which outlines the types of information we collect and how we use it, and that we will respect your wish to opt-out of our communications at any time.
Corporate Headquarters
- Unico
- 3725 Nicholson Rd.
- P. O. Box 0505
- Franksville, WI 53126-0505
- 262.886.5678
Join Our Team
- Drop in your resume at –
- hr@wodehousecapital.com
- + 91 22 66336600
Talk to our Sales Team
Our sales professionals are eagerly awaiting your questions. Fill out the form below and we’ll be in touch. If you’re looking for product support click here
Disclaimer
Please see our Privacy Policy which outlines the types of information we collect and how we use it, and that we will respect your wish to opt-out of our communications at any time.