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Appendix C Glossary of Scientific Terms and Abbreviations Tripleexpansion plant – As used in this report, a power plant that uses a very highpressure geofluid and three pressurereducing processes and two separation stages to produce steam at two different pressure levels for use in a steam turbine; altogether the geofluid is subjected to three expansion processes, two of which generate electricity. Triplet configuration – A pattern of production and injection wells in which each injector is surrounded by two producers. Trouble (during drilling) – Unanticipated difficulties encountered during drilling, including, for example, stuck drill pipe, twistoff of the drill bit, lost circulation, blowouts, mud pump failure, failed cement jobs, casing collapse, and equipment lost downhole. The cost of trouble becomes more significant the deeper one drills. Turbine isentropic efficiency – A measure of the performance of a turbine, defined as the ratio of the actual work (or power) delivered by the turbine to the ideal work (or power) that could be delivered if the turbine were adiabatic (no heat losses) and reversible (no friction), i.e., isentropic (constant entropy). A20 TVD – Total vertical depth. The vertical distance from the wellhead to the bottom of the well. For directionally drilled wells, the TVD is smaller than the total drilled length of the well. Underbalanced drilling – The practice of intentionally drilling a well with borehole pressure less than the formation pore pressure. Underreaming – A method of opening up a wellbore to a larger size, often achieved by setting the drill bit below the bottom of the casing string and expanding it radially. USGS – United States Geological Survey. A federal agency responsible for characterization and assessment of the Earth’s water and mineral resources (including oil, gas, coal, and geothermal), natural hazards, and the environment. Utilization efficiency – A measure of how close an energy conversion system comes to ideal operation. It is defined as the ratio of actual net power to maximum possible power, usually expressed as a percentage. Variable costs – Fluctuating costs of operation of a facility. For this study, these include: fuel costs, electricity to run injection and circulating pumps, maintenance, interest and principal repayments, taxes, and depreciation. Wellcost Lite – A computer model (developed by Bill Livesay, working with staff at Sandia National Laboratories) that estimates the cost of a well of a specific depth, casing design, diameter, and geological environment.PDF Image | Appendix A Energy Conversion Factors Btus quads calories kWh
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