Hot Dry Rock Features

Flash or binary technology could be used with HDR resources depending on the temperature. However, because o f the constraints imposed by high well costs, a larger portion of the accessible HDR resource will produce well-hea d fluids in the moderate temperature range. Therefore, binary technology is characterized for HDR resources.

To date, HDR resources have not been developed commercially for two reasons. Well costs increase exponentiall y with depth, and since HDR resources are much deeper than hydrothermal resources, they are much more expensiv e to develop. Also, although the technical feasibility of creating HDR reservoirs has been demonstrated at experimental sites in the U.S., Europe, and Japan, operational uncertainties regarding impedance (resistance of the reservoir to flow), thermal drawdown over time, and water loss make commercial development too risky.

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