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Fundamentals of Wellfield Operations and Maintenance GRC Annual Conference October 3, 2008

Fundamentals of Wellfield O

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Fundamentals of Wellfield Operations and Maintenance GRC Annual Conference October 3, 2008

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    1. Fundamentals of Wellfield Operations and Maintenance GRC Annual Conference October 3, 2008 Monte C. Morrison, PE, EMT Director of Asset Operations Constellation Energy

    2. Fundamentals of Wellfield O&M Monte Morrison Lifelong Nevadan 23+ years experience in the field Nevada PE in Chem. Engineering (10 yrs. Nevada EMT 1 (20 yrs.) Managed O&M of eleven geothermal plants in Nevada, California Hawaii Managed wellfield from 265oF to 630oF Experience with lineshaft and ESP pumps, as well as flash steam resources

    3. Fundamentals of Wellfield O&M What makes up wellfield? Wells Production Injection Observation Gathering system Pumps and auxiliaries Production Injection

    4. Fundamentals of Wellfield O&M Success in Operations and Maintenance Education Experience Limiting of the Ego Listen to your peers, consultants but mostly the technicians in the field! There is no substitute for living the O&M of a wellfield.

    5. Fundamentals of Wellfield O&M This presentation focuses on lineshaft pumped production wells Pumped or residual pressure injection systems Practical engineering, operations and maintenance information Will not deal with geologic studies and testing

    6. Fundamentals of Wellfield O&M Production Wells Lineshaft pumps Surface electric motor Many auxiliaries OIL! Nitrogen Coolant MCC

    7. Fundamentals of Wellfield O&M Auxiliaries

    8. Fundamentals of Wellfield O&M Injection wells Just another hole in the ground! Pumped or residual pressure

    9. Fundamentals of Wellfield O&M Basics Pumped wells need TLC (tender loving care) 1400+ feet of shaft 2-3/16” Longer than an aircraft carrier 800 HP or greater 280 or more bearings 70 couplings Mechanical seal And the pump All are a cause of replacement! Push/pull! Now the good news

    10. Fundamentals of Wellfield O&M Early Pump life spans measured in days Two years was the standard 20 years ago Now pumps can run 24/7 for 9 or more years, even deep hot settings How? Knowing what they like and dislike Watch the gases CO2 and steam Watch the scale Dead head Cavitation Watch the gas breakout

    11. Fundamentals of Wellfield O&M

    12. Fundamentals of Wellfield O&M Operating the pump Reading the curve Readings Gas Breakout LLOP-Liquid Level over Pump Amps Flow Temperature Discharge pressure Annulus pressure Oil and water pressure

    13. Fundamentals of Wellfield O&M Pump Curve Measuring actual against theoretical Regulating flow Match downhole pressure with GBO Leave a margin Gas breakout Critical to operating the pump Measure by chemistry Measure by pressure device

    14. Fundamentals of Wellfield O&M Wellfield Management Production versus Injection The two biggest issues Breakthrough temperature drop Loss of water table (and hence flow) Long term flow sustainability Distribute flow Monitor wellfield conditions’ Trend to watch results

    15. Fundamentals of Wellfield O&M

    16. Fundamentals of Wellfield O&M Special Considerations Electrical Submersible Pumps No oil-green Short life (in my experience) Injection Pumps Water hammer Efficient operation Operation in hill country Head loss and gain Chemical treatment Calcite-calcium carbonate Silica

    17. Fundamentals of Wellfield O&M Closing Questions and hopefully answers! “When making changes to the wellfield, you can be a failure overnight, but it can take years to prove success” Monte Morrison, 1995

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