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Through further review of the Laurel site and its high ambient temperatures, ElectraTherm determined the air cooled condenser going in was undersized for this site. Concurrent testing at ElectraTherm’s test cell showed an approximate 40% power derate, a clear factor in limiting optimal output at the site. Subsequent performance modeling of the Denbury site concluded that with higher flow rates (>150 GPM) and an appropriate sized air cooled condensing unit, the average annual output of the green machine would be 50kWe gross/38.5kWe net at this location. To reach maximum power output capabilities on a Green Machine (65kWe gross), heat and flow parameters would reach 240°F at 160 GPM, and require an ambient air temperature of 60°F. Conclusion The demonstration at Denbury’s Laurel site provides insight into future applications to reduce installation time, increase efficiency, generate additional power and minimize maintenance. This kind of co-generation can be particularly effective to reduce the energy costs for pumping hard to reach oil, an increasing activity in the United States. Hurdles remain in developing co-produced fluid opportunities but progress has been and continues to be made. Primarily, economics will play a critical role in the growth of this industry. Lower costs of power in the United States directly impacts demand for alternative resources. ElectraTherm sees an attractive return on investment in locations where cost of power is $.10/kWh or higher. In locations where cost of power is less than $.10/kWh, additional incentives or corporate objectives would be necessary to make the opportunities attractive. Oil and gas companies produce oil and gas as a primary objective. Oil and gas producers will need to recognize the inherent benefits of power generation from co-produced fluids to enable cost savings at each site and establish a firm commitment to the environment and sustainability. ElectraTherm is currently using this demonstration data for a project with the Department of Energy at a geothermal well in Nevada. The project, located at Florida Canyon mine outside Winnemucca, Nev., has similar challenges with geothermal brine and will be using a gasketed plate and frame heat exchanger. ElectraTherm will take the experience at Laurel to further progress this and future geothermal projects. That site will not be as challenged on flows and temperatures. The well flow will exceed Green Machine requirements and at 230°F we are targeting 65-75kWe gross at the site. Scientists in SMU’s Geothermal Lab see a natural partnership in co-production of geothermal energy from oil and gas wells. Large quantities of water are produced with the extraction of oil and gas, either because it was present in the reservoir before drilling, or because water was injected into the formation to force oil and gas to the surface. ElectraTherm’s Green Machine can harness these wells with a modular, robust solution that is easy to install and maintain. Tapping the hot water from oil and gas wells to generate additional power from heat that would otherwise go to waste is efficient, environmentally-beneficial and economical. ElectraTherm would like to thank the Department of Energy’s RPSEA program, Denbury Resources and Gulf Coast Green Energy for their diligent efforts in making this demonstration a success. THIS IS SMART POWERTMPDF Image | Mississippi Oilfield Generates Emission Geothermal Power
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