Drilling Down on Geothermal Potential Central America

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million US dollars, every single gradient well could add US$0.5 to 1 million to that figure. Investments for phase 1 and 2 are project specific and therefore cannot be generalized. 16. Both environmental and social aspects must be considered at this phase, as exploration teams enter areas that potentially are not accustomed to or notified of the presence of workers and heavy equipment. In addition to proper communication programs to inform the surrounding community before and during exploratory work, measures should be taken to minimize noise and traffic interruptions, control dust, contain and dispose of liquid and solid waste, and restore the exploratory site. 17. Phase 3, the test drilling phase, is the last of the “preparatory” phases. At the end of this phase the project developer should be able to decide, based on scientific evidence and characteristics of the data acquired, whether he wants to continue the project (e.g. build and operate a power plant) or abandon it. 18. In the beginning of this phase, a drilling program is designed to develop the target in order to confirm the existence, the exact location, and the potential of the reservoir in question. Usually a set of 3 to 5 full size geothermal wells are drilled, but depending on location, accessibility and infrastructure at the geothermal field, it is often advisable to start with slim holes. Slim holes are holes with a smaller diameter than full size wells, meaning they can be drilled with lighter equipment (drillings rigs) than full size wells, which require extremely heavy equipment (several hundred tons), transported in many dozens of containers (See Figure 17). At this stage, no final decision is made about whether the wells will be used as production or re-injection wells, since the developer does not know the performance of the wells at this stage. New wells might have to be stimulated after drilling in order to remove any mud or other material clogging the cracks and faults in the rocks and thereby increase permeability and volume flow of the geothermal fluids or steam into the borehole. Interference tests between the different boreholes will show if and how the wells are interconnected and thereby give scientists a clearer picture of the potential, shape and size of the reservoir in the subsurface. 19. The investments related to this phase can be high, but are project specific. Depending on the location and depth of drilling, a slim hole drilling costs between US$ 0.5 and 1.5 million, while a full size well would usually be in the range of US$ 2 to 6 million. For example, for four full size wells of 2.5 to 3 km each and the related scientific work the investment would typically be between US$ 10 and 25 million, depending on the location of the geothermal field and the need to build or reinforce access roads. The mobilization costs for the drilling equipment can be a significant part of the overall costs of this phase, since dozens of heavy full size containers, including fuel and power generators, long steel pipes (casings) and cement will have to be transported to the drilling site. 60

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