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Netherlands Journal of Geosciences e12-9 Figure 9. Results of sensitivity analy- sis of well configuration and gas flow rate 1,200,000Sm3 d−1 on cumulative gas production of ROD-102. (A) Varying geothermal producer and -injector dis- tances and geothermal flow rates; (B) bottom hole pressure. Figure 10. Map view of the main fault block of the Roden gas field with a decreasing permeability trend from the ROD-102 well towards the geothermal wells. Sensitivity to reservoir permeability Methodology The aforementioned 16 geothermal well configurations are used to assess three different permeability grids. The first grid considers a doubling of the original permeability grid (10 and 90 mD) in both intervals to 20 mD (shaly sand interval) and 180 mD (sand interval). The vertical reservoir permeability is also doubled. In the second grid the homogeneous permeability distribution is replaced by a trend. The sand interval has a permeability of 90 mD at the ROD-102 well, which decreases towards ±67 mD at the geothermal producer and ±50 mD at the geothermal injector (Figure 10). The permeability trend values for the shaly sand inter- val are 10 mD towards 7.5 mD and 5.5 mD respectively. The third grid considers an inversed permeability trend. Here the sand inter- val has a permeability of 90 mD at the outermost possible geother- mal injector, which decreases towards ±58 mD at the geothermal producer and 45 mD at the ROD-102 well (Figure 11). For the shaly sand interval the trend values range from 10 mD to 6.5 and 5 mD respectively. For each of the alternative permeability grids, a new base case scenario is simulated for comparison. Results Doubling the reservoir permeability, and having no geothermal exploitation, results in a higher total gas production (4.87 BCM) in comparison with the reference model (Table A2 in the Appendix). ROD-102 is closed-in in late 1993, with water breakthrough starting in 1987. While the addition of the geothermal doublet again results in increased total gas production, the relative increase is smaller than in the reference model (Table A2 in the Appendix; Figure 12A). The increased permeability causes the BHP to decrease more slowly during gas production (Figure 12B). As with previous sensitivity analysis, the change in distance of the geothermal producer changes the total gas production. However, with increased permeability the change in distance of Downloaded from https://www.cambridge.org/core. IP address: 173.229.12.141, on 13 Jan 2021 at 23:29:16, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1017/njg.2019.11PDF Image | Dual hydrocarbon–geothermal energy exploitation
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