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Mighty River Power’s Geothermal R&D Programme
Joe Gamman
Geothermal R&D Manager
Mighty River Power
4th Dec 2008
OERC Symposium
University of Otago
Slide 2
Mighty River Power
Generator (22% of NZ’s energy)
• 1000 MW hydro
• 170 MW Nat Gas Cogeneration Plant
• 270 MW Geothermal
− NP: 132 MW on-line early 2010
− NT: 500 MW Geothermal by 2012
Slide 3
Geothermal Systems
<200°C>200°C
Slide 4
Steam Turbine Power Plant
UP
TO
4 K
M
CYCLONE SEPARATO R
C ON D ENSER
P SI
v v v v v v
V V V V V V
EL EC T R IC A LG EN ER ATO R
FLA S H IN G TOS T E A M -B R IN E M IX TU R EIN B O R E H O L E
R E S E R V O IR B R IN E
PU M P
S T E A MTU R B IN E
B R IN EIN JE C TIO NW E LL
C ON D ENSATEINJEC TIO N
W ELL
CO O LI N GTO WER
P U M P
CYCLONESCRUBBERS T E A M
S T E A M
T U RB IN E STE A M E XH A U ST
C O N D E N S AT E
C O L D C O N D E N S AT E
Geothermal Power Plant Cycle
Slide 5
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Geothermal Exploration
Gas & fluid geochemistry & resistivity are the major tools• Geochemistry provides temperature constraints• Geophysics addresses permeability
Geology, alteration, & structure establish context
Drilling targets based upon conceptual model
Drilling is expensive ($8-10M per well) and high risk!• ~ 1 in 5 exploration wells are successful
Slide 9
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Reservoir Models and Management
Key tools in understanding reservoir processes are pressure, temperature & chemistry monitoring
Levelling – Subsidence
Gravity – mass change
Seismicity – injectate tracking
Slide 12
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Geothermal Drilling
Typically drill to 2500-3000m
45-60 days duration
$8-10M per well
Can drill multiple deviated wells from a single location
Slide 14
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Geothermal R&D Objectives
Strategic Research Areas
Graduate Support
Sustained Value from Innovation
Enhance NZ’s Geothermal Reputation
Slide 17
Strategic Research Areas
Still under discussion but may include topics such as:
• Advanced Materials
− Geothermal brines are extremely corrosive – we’re outside the standard parameters
• Understanding the Reservoir
− Better steamfield management and predictability
• Targeted Drilling Programme
− Exploration and well targeting through smarter MT and Seismic
• Understanding Scale Formation
− Molecular control of silica/calcite/x-oxide behaviour
Slide 18
Process
Identify, Incentivise and Collaborate with the best researchers
Create a valuable Point Of Difference over 3/5/10 y timeframe
Proposals are received and evaluated continuously
• Business Case prepared by MRP, evaluated and communicated back to the researcher
R&D Stakeholder Management
• Encourage campus-wide collaboration to rationalise stakeholder management ie, OERC