Analysis of Geothermal Reservoir and Well Operational Conditions using Monthly Production Reports from Nevada and California

Koenraad Beckers, Katherine Young, Henry Johnston, Diana Snyder

Research output: Contribution to conferencePaperpeer-review

9 Scopus Citations

Abstract

When conducting techno-economic analysis of geothermal systems, assumptions are typically necessary for reservoir and wellbore parameters such as producer/injector well ratio, production temperature drawdown, and production/injection temperature, pressure and flow rate. To decrease uncertainty of several of these parameters, we analyzed field data reported by operators in monthly production reports. This paper presents results of a statistical analysis conducted on monthly production reports at 19 power plants in California and Nevada covering 196 production wells and 175 injection wells. The average production temperature was 304°F (151°C) for binary plants and 310°F (154°C) for flash plants. The average injection temperature was 169°F (76°C) for binary plants and 173°F (78°C) for flash plants. The average production temperature drawdown was 0.5% per year for binary plants and 0.8% per year for flash plants. The average production well flow rate was 112 L/s for binary plant wells and 62 L/s for flash plant wells. For all 19 plants combined, the median injectivity index value was 3.8 L/s/bar, and the average producer/injector well ratio was 1.6. As an additional example of analysis using data from monthly production reports, a coupled reservoir-wellbore model was developed to derive productivity curves at various pump horsepower settings. The workflow and model were applied to two example production wells.

Original languageAmerican English
Pages2844-2856
Number of pages13
StatePublished - 2017
EventGeothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017 - Salt Lake City, United States
Duration: 1 Oct 20174 Oct 2017

Conference

ConferenceGeothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017
Country/TerritoryUnited States
CitySalt Lake City
Period1/10/174/10/17

NREL Publication Number

  • NREL/CP-5500-68701

Keywords

  • Injection temperature
  • Injectivity index
  • Production temperature
  • Reservoir performance
  • Reservoir production
  • Thermal drawdown
  • Well flow rate
  • Well ratio
  • Wellbore modeling

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