The influence of facies heterogeneity on the doublet performance in low-enthalpy geothermal sedimentary reservoirs

R. A. Crooijmans, C. J. L. Willems, H. M. Nick, D. F. Bruhn

Research output: Contribution to journalArticle

30 Citations (Scopus)
1 Downloads (Pure)

Abstract

A three-dimensional model is used to study the influence of facies heterogeneity on energy production under different operational conditions of low-enthalpy geothermal doublet systems. Process-based facies modelling is utilised for the Nieuwerkerk sedimentary formation in the West Netherlands Basin to construct realistic reservoir models honouring geological heterogeneity. A finite element based reservoir simulator is used to model the fluid flow and heat transfer over time. A series of simulations is carried out to examine the effects of reservoir heterogeneity (Net-to-Gross ratio, N/G) on the life time and the energy recovery rate for different discharge rates and the production temperature (Tmin) above which the doublet is working. With respect to the results, we propose a design model to estimate the life time and energy recovery rate of the geothermal doublet. The life time is estimated as a function of N/G, Tmin and discharge rate, while the design model for the energy recovery rate is only a function of N/G and Tmin. Both life time and recovery show a positive relation with an increasing N/G. Further our results suggest that neglecting details of process-based facies modelling may lead to significant errors in predicting the life time of low-enthalpy geothermal systems for N/G values below 70%.

Original languageEnglish
Pages (from-to)209-219
Number of pages11
JournalGeothermics
Volume64
Early online date17 Jun 2016
DOIs
Publication statusPublished - Nov 2016

Keywords

  • Doublet
  • Geothermal
  • Heterogeneity
  • Net-to-Gross ratio
  • Non-isothermal flow
  • Sedimentary formation
  • Variable fluid properties

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Geotechnical Engineering and Engineering Geology
  • Geology

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