Crooijmans, R.A., Willems, C.J.L. , Nick, H.M. and Bruhn, D.F. (2016) The influence of facies heterogeneity on the doublet performance in low-enthalpy geothermal sedimentary reservoirs. Geothermics, 64, pp. 209-219. (doi: 10.1016/j.geothermics.2016.06.004)
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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, Tminand 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%.
| Item Type: | Articles |
|---|---|
| Keywords: | Doublet, geothermal, heterogeneity, net-to-gross ratio, non-isothermal flow, sedimentary formation, variable fluid properties. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Willems, Dr Cees |
| Authors: | Crooijmans, R.A., Willems, C.J.L., Nick, H.M., and Bruhn, D.F. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Geothermics |
| Publisher: | Elsevier |
| ISSN: | 0375-6505 |
| ISSN (Online): | 1879-3576 |
| Published Online: | 17 June 2016 |
| Copyright Holders: | Copyright © 2016 The Authors |
| First Published: | First published in Geothermics 64: 209-219 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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