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Supercritical Carbon Dioxide Circulated EGS Combined with IGCC in New Mexico 9.3.3 Discounted future re-drilling and well stimulation Discounted future re-drilling and stimulation savings are realized through operator experience at the site. It is assumed that as more wells are drill and stimulated the operator will become more efficient in their activities. In areas of complex geology these savings will be less than areas that are less complex. For this project the first wells are to be drilled in the deeper basin fill areas. For all future wells the depth to sound bedrock will be shallower because the geothermal field movement will be towards the edge of the rift basin. Well stimulation costs will also follow a similar trend. For the initial wells more of the reservoir will be within the un-fractured crystalline basement rocks which will require more effort to stimulate and create an effective zone of connected fractures. As the future wells are drilled where the crystalline basement rocks are shallower, more of the basement faulting of the rift basin will be included within the reservoir. These faults and associated fractures will require less stimulation to create the same effective zone of connective fractures. 9.4 Gravity Separation- scCO2-Double Flash Conversion System As discussed in the Geothermal Energy Conversion chapter, the proposed power plant to convert the produced fluids heat into electric power is two different processes. There will be a scCO2 stream and a water stream if there is economically sufficient produced water. For estimating the economics of this project it is first necessary to determine the level of water production required for an economically feasible double flash power plant. This can be accomplished without simulation data. Later this analysis can be applied to modeled produced water to further prove or disprove the viability of producing electricity from water produced from a scCO2 injection scheme. To determine the economic feasibility of creating a dedicated double flash geothermal for the produced water a series of calculations was completed because the current version of GETEM contains no functional flash power plant calculations within the spreadsheet model. To determine the capital costs and the operation costs equations from Sanyal (2004), MIT (2006), and Dagdan (2007) were used. The results of this analysis are presented in Table 15. A further sensitivity analysis to determine if the potential flows would be economical were conducted at flow rates of 100kg/s, 200kg/s, and 300kg/s. Additionally power prices at $0.05, $0.10, and $0.15/kwh were determined. Included within these calculations are the O&M costs presented by Sanyel (2004) which are tied to the size of the plant. A flat geothermal credit of $0.02/kwh was also included in the calculation. It can be seen that all of three options warrant their own double flash system with the system paid for within the first five years. This is particularly attractive because if water is used within the heat exchanger of the scCO2 turbine then this additional water can be processed through the double flash system within the low pressure turbine which would lower the costs of the project. Penn State University | 9.4 Gravity Separation- scCO2-Double Flash Conversion System 108PDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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