Drilling Technology and Costs

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Drilling Technology and Costs ( drilling-technology-and-costs )

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A.6.3 Model Results for Specific Areas and Depths Drilling Technology and Costs Wells selected to represent potential U.S. EGS sites have been cost estimated using the Wellcost Lite modeling technique with the same performance parameters and cost values from earlier work reported. The variations in depth and bit performance have been an input for each model. The list of U.S. EGS sites is preliminary, but well cost can be estimated for any site that is chosen. The specific U.S. EGS sites well costs are as follows: 6­49 Chapter 6 a. East Texas – NW LA / E Texas Basin Well cost Well design reservoir temperature Formations Bit performance Casing shoe TD Open­hole interval b. SEIdaho–NUtah/OreIda Well cost Well design reservoir temperature Formations Bit performance Casing shoe TD Open­hole interval $7,665,032 / 69 days of drilling 200°C Sandstone grading to harder sediments Sediment to the hot zone, then altered sediments 13,350 ft 16,400 ft 3,050 ft $6,993,136 / 81 days of drilling 265°C Basalt to 1,500 m Crystalline to 4,500 ft (1,500 m), then altered sediments, followed by crystalline 14,100 ft 16,400 ft, 5,000­4 2,300 ft The Ore Ida well is estimated using the 5,000­4 well, since it is thought that wellbore stability will not be a significant problem in that area. If wellbore stability is a perceived problem, then the cost would be greater. c. NE Montana / Poplar Dome Well cost Well design reservoir temperature Formations Bit performance Casing shoe TD Open­hole interval $3,166,027 / 37 days of drilling 135°C Madison limestone, sandstone, limestone and shale Altered sediment throughout 6,200 ft 7,200 ft 1,000 ft

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