ThermalDrive(TM) Technology - Direct Use of Geothermal ...
Transcript of ThermalDrive(TM) Technology - Direct Use of Geothermal ...
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ThermalDrive™ TECHNOLOGY-Direct Use of Geothermal Energy in Oil & Gas Fields
Presented byRichard Darlow
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• ESPs pump almost 60% of global oil production annually
• However they have a system efficiency of only 35% to 6O%
ANATOMY OF AN ELECTRICAL SUBMERSIBLE PUMP (ESP)
ELECTRICAL COMPONENTS CONTRIBUTE 46% OF ESP LOSSES
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• $400,000 annual power cost at 3,000 BPD & 7,500 ft. head ($0.10/kwh)
• Short average service cycle of 1.5 to 2.5 years
• Limited capability in high temperature environments
ANATOMY OF AN ESP Continued
$-
$200,000.00
$400,000.00
$600,000.00
$800,000.00
3,000 6,000 9,000 12,000Head in Feet
Annual Power Cost Vs. HeadPumping Rate: 3,000 BPD Utility
Rate: $0.10/KWh
* DOWNHOLE ELECTRICAL COMPONENTS ARE HIGHEST CONTRIBUTOR TO ESP SYSTEM FAILURES
Nor
mal
ized
Fai
lure
Rat
e
* Source: 2008 RIFTS Database
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• Originally developed for geothermal power market
• Eliminates high failure rate down-hole electric motor, cable and seal
• Eliminates costly medium voltage VFD and switchgear
• Offers dramatic reduction in power consumption
• Thrives in high temperature environment
ThermalDrive™ - a Downhole Thermal Motor to Drive a Submersible Pump
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ThermalDrive
Productionzone
Expander
Pump
Condenser
• Turbo-expander driven by supercritical working fluid
• Working fluid builds high pressure and temperature by▫ Gravity head from tall liquid column▫ Heat transfer from produced fluid
• Thermo-syphon loop driven by▫ High pressure vapor rising through the well annulus▫ Vapor being condensed at the surface creating a pressure drop
• Pump shaft is magnetically coupled to turbo-expander for▫ Separation of production and working fluids▫ Allowing wireline retrieval of the pump
Charge Pump
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ThermalDriveTurbo Expander Rotor Pump Shaft with Coupling
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ThermalDrive
MAGNETIC COUPLINGProvides separation between produced fluid & working fluid PRODUCTION TUBING
TURBO EXPANDERWorking fluid in annulus, compressed by gravity & heated by production fluid, spins motor
PUMP SECTIONWireline retrievable through production tubing
ThermalDrive™
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Productionzone
Expander
Pump
Condenser
• Power generation becomes an option when produced fluid has sufficient heat.
• High energy working fluid vapor exits wellhead and runs a turbine generator
• Provides auxiliary oilfield power or renewable energy to the grid
ThermalDrive PlusTurbine
Generator
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Productionzone
Expander
Pump
• Offshore co-production of power
• Consistent sea-floor temperature provides optimal thermal cycle potential for power generation (ΔT)
• Substantially reduces cost of offshore power consumption
Turbine Generator
ThermalDrive OffshoreCondenser
Auxiliary Power
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ThermalDriveSEABED PUMPING/POWER GENERATION (1 of 2)• For free flowing or gas lift production wells
• Extracting thermal heat from subsea wellbore to drive seabed pumping or power generation
• Consistent sea-floor temperature provides optimal thermal cycle potential (ΔT)
PATENTED PIPE WITHIN A PIPE WELLBORE HEAT EXCHANGER TECHNOLOGY
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ThermalDriveSEABED PUMPING/POWER GENERATION (2 of 2)
PATENTED WELLBORE MULTI-TUBE HEAT EXCHANGER TECHNOLOGY
• High efficiency heat exchanger for medium to high power applications
• Requires larger diameter wellbore vs. pipe in pipe heat exchanger
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THYMO™ (Thermal Hydraulic Model)
Productionzone
Expander
Pump
143°F85 psia
Produced Fluid
143°F 85 psia
241°F 3118 psia
234°F 83 psia
240°F 1278 psia
7000’
10000’
Working Fluid (down)
154°F 2359 psia
220°F 5985 psia
Working Fluid(up)
145°F 359 psia
195°F 2434 psia
ReservoirConditions:
240°F1312 psia
3000 BPD100°F
ambient
Condenser
Working Fluid:R125
Example• Production Rate = 3,000 BPD• Pump Depth = 7,100 ft• Reservoir Temp. = 240⁰F
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THYMO SAGD Example
Productionzone
Turbo-Expander
Pump
140°F125 psia
Produced Fluid
313°F 130 psia
400°F 519 psia
399°F 282 psia
400°F 356 psia
1000’
1200’
Working Fluid (down)
92°F 303 psia
386°F 560 psia
Working Fluid(up)
254°F 394 psia
376°F 473 psia
ReservoirConditions:
400°F400 psia
3000 BPD70°F
ambient
Condenser
Working Fluid:HFC-236fa
Example• Production Rate = 3,000 BPD• Pump Depth = 1,000 ft• Reservoir Temp. = 400⁰F• Electricity Generation ≈ 300 kW
332 kW
28 kW
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• THYMO™ - Thermal Hydraulic Model well performance evaluation software▫ Blade Energy Partners – developed original version for geothermal
market▫ Ortloff Engineers – adapted software model to oil well applications
• Turbo Expander – at technology readiness level (TRL) 5▫ Concepts NREC – developed design for turbo expander
• Seeking partner for in-well testing
State of Technology