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6.1 Scope and Approach Drilling Technology and Costs Exploration, production, and injection well drilling are major cost components of any geothermal project (Petty et al., 1992; Pierce and Livesay, 1994; Pierce and Livesay, 1993a; Pierce and Livesay, 1993b). Even for highgrade resources, they can account for 30% of the total capital investment; and with lowgrade resources, the percentage increases to 60% or more of the total. Economic forecasting of thermal energy recovery by Enhanced Geothermal System (EGS) technologies requires reliable estimates of well drilling and completion costs. For this assessment, a cost model – flexible enough to accommodate variations in welldesign parameters such as depth, production diameter, drilling angle, etc. – is needed to estimate drilling costs of EGS wells for depths up to 10,000 m (32,800 ft). Although existing geothermal wellcost data provide guidance useful in predicting these costs, there are insufficient numbers of geothermal well records, of any kind, to supply the kind of parametric variation needed for accurate analysis. Currently, there are fewer than 100 geothermal wells drilled per year in the United States, few or none of which are deep enough to be of interest. Very few geothermal wells in the United States are deeper than 2,750 m (9,000 ft), making predictions of deep EGS wells especially difficult. Although there are clear differences between drilling geothermal and oil and gas wells, many insights can be gained by examining technology and cost trends from the extensive oil and gas well drilling experience. Thousands of oil/gas wells are drilled each year in the United States, and data on the well costs are readily available (American Petroleum Institute, JAS, 19762004). Because the process of drilling oil and gas wells is very similar to drilling geothermal wells, it can be assumed that trends in the oil and gas industry also will apply to geothermal wells. Additionally, the similarity between oil and gas wells and geothermal wells makes it possible to develop a drilling cost index that can be used to normalize the sparse data on geothermal well costs from the past three decades to current currency values, so that the wells can be compared on a common dollar basis. Oil and gas trends can then be combined with existing geothermal well costs to make rough estimates of EGS drilling costs as a function of depth. Oil and gas well completion costs were studied to determine general trends in drilling costs. These trends were used to analyze and update historical geothermal well costs. The historical data were used to validate a drilling cost model called Wellcost Lite, developed by Bill Livesay and coworkers. The model estimates the cost of a well of a specific depth, casing design, diameter, and geological environment. A series of basecase geothermal well designs was generated using the model, and costs for these wells were compared to costs for both existing geothermal wells and oil and gas wells over a range of depths. Knowledge of the specific components of drilling costs was also used to determine how emerging and revolutionary technologies would impact geothermal drilling costs in the future. 63 Chapter 6PDF Image | Drilling Technology and Costs
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