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Pump-Off Controllers
Chris PattersonProduction GroupAthabasca Oil Sub Business UnitCanadian Foothills & Frontier RegionAugust 23, 2004
Agenda
Pelican Lake Overview
Theory of Pumped-Off
Current Well Optimization Techniques
What are Pump-Off Controllers?
Results from Pump-Off Controller Test
Economic Evaluation
Recommendations
Pump-Off Controllers
Pelican Lake Oil
• 500 Producing Horizontal Wells • 22,000 Barrels/Day (Heavy Oil)• Secondary Recovery – Waterflood• 180 Water Injectors
Pump-Off Controllers
What is Pumped Off?
Reservoir
1700 KPa
PUMP
300m
ΔP Inflow= 1700KPa
Pumped-Off
Pump-Off Controllers
Darcy’s EqnFlow α ΔP
Reservoir
1700 KPa
PUMP
50mStatic Pressure
=ρgh
500 KPa
ΔP Inflow= 1200KPa
Not Pumped-Off
Current Well Optimization Technique
Fluid Shot -> Change Speed -> Fluid Shot -> Change Speed
Pump-Off Controllers
Fluid Gun
Echo Meter
Calling to Change Speed
Control Room:Please speed up from
100 to 130 rpm
Pump-Off Controllers
Current Optimization Techniques
Advantages Disadvantages Standard oilfield practice
Safe and reliable
Good production
Time consuming
“Snap Shot” of fluid level
Infrequent tests
Requires testing equipment
Not completely pumped-off
Pump-Off Controllers
Project Scope
Researched potential vendors with pump-off controllers.
Installed 8 Pump-Off Controllers from 4 vendors and ran trials – No cost to EnCana.
Reviewed results.
Obtained formal quotes c/w installation costs.
Recommended pump-off controller strategy with economic justification.
Pump-Off Controllers
Vendor/Controllers Evaluated:
Pump-Off Controller Units
StellarTech
Grizzly Electric
Lufkin Automation
VFD Pump-Off Controllers (Software Upload)
Wermac Electric
Pump-Off Controllers
What we currently have
Pump-Off Controllers
Top Drive
WermacVariable Frequency
Drive SCADA
Where the Pump-Off Controller Fits In
Top Drive WermacVFD
SCADAController
Flow Sensor
Pump-Off Controllers
VFD Pump-Off Controllers
Top DriveWermac
VFD SCADA
Wermac Flow Sensor
Pump-Off Controllers
SoftwareUpload
Test Results
StellarTech – Controller unsuited for application.
Grizzly Electric – 15% increase in production. Controller algorithm requires further modification.
Lufkin Automation – Initial install problems. Just installed (no data).
Wermac Electric – 28% increase in production. Best overall Pump-Off Controller.
Pump-Off Controllers
Controller Evaluation – Wermac
Operator’s are familiar with Wermac VFD’s.
No need for physical controller.
No cost for software.
Controller algorithm is robust and versatile.
Proven in Pelican Lake field trials.
Good customer service and technical help.
Pump-Off Controllers
Results – Controller Off
RPM
Floco Flow (m^3/day)AccumulatedVolume (m^3)
Average Production:41 m^3/day
Pump-Off Controllers
Results – Controller On
Average Production:52.5 m^3/day
RPM
Floco Flow (m^3/day)
AccumulatedVolume (m^3)
Thermal Flow %
28% Increase inProduction
Pump-Off Controllers
Economic Results:
NPV After Tax @ 9%: 68 M$
After Tax ROR: 100%
Payout Period: 7.1 months
PIR @ 9%: 3.92 M$/M$
All EnCana economic hurdles met and exceeded!
Pump-Off Controllers
Pump-Off Controllers:
Advantages Disadvantages
Optimized fluid levels
Increased production
Optimize operator time
Simple to operate
Increased pump-life
Additional capital required
Increased maintenance costs
Pump-Off Controllers
Recommendations:
Continue testing of controllers.
Install Wermac controllers on new infill pad under primary production (Pad NE-65) – in progress.
Include funds in 2005 Capital Budget for Wermac pump-off control – accepted.
Test using existing floco meter to replace thermal flow sensor.
Pump-Off Controllers
