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problems are site specific problems that are dealt with at existing large scale geothermal and similar applications today. Installation and Operation at Remote Locations ElectraTherm’s modularity proved extremely helpful in both installation and removal. The truck bed set-up enabled door to door transportation of an almost fully configured balance of plant. ElectraTherm believes that our 50 hour installation could be reduced to less than a day in the future with additional planning. The Laurel installation was stagnant for hours at a time as the team waited on engineers’ scheduled arrival times. By reducing time in between processes, total install time could be cut in half. Maintenance sometimes proved difficult with limited resources at the remote site and no trained technicians on location. Provided limited training on the Green Machine’s operations, the Denbury personnel did an outstanding job of filling in as field technicians. However, ElectraTherm offers 2-3 day training courses on the commissioning, operation and service of our machines. Obviously, training of oil field operators would have gone a long way in providing simple maintenance to the equipment. It is well understood that the competencies required to operate oil and gas operations would easily cover the maintenance issues that were encountered during the trial period. Initial installation included pilot operated bypass valves for the Green Machine to ensure ongoing site operations while the Green Machine was down due to high ambient temperatures or for routine maintenance. The valves selected on the hot water supply bypass were small pilot solenoid valves that drive a larger valve. These smaller valves were not suitable for the brine pumped through the pipes and the slurry clogged one of the pilot valves and caused a pipe malfunction. ElectraTherm learned that regular cleaning or a new selection in valves would keep this from happening again. The focus was on the Green Machine operation, proper selection of industry standard balance of plant equipment would eliminate the one issue encountered. Economics Review of the demonstration and cost analysis speaks to the economic benefits of the application. A post project analysis concluded that the Green Machine’s power generation offset about 20 percent of the energy required to run the down-hole pump on the oil well. ElectraTherm’s Green Machine can provide an attractive payback at oil and gas sites where cost of power leans on the higher side, and where producers see the environmental value in electricity from waste heat, either as a public relations benefit or acting on corporate social responsibility metrics. Limitations of High Ambient Temperatures One of the greatest challenges at Laurel was the high ambient temperatures during a Mississippi summer using air cooled condensing. The high ambient temperatures mixed with lower temperature geothermal water (204°F) and low flows equated to a lower system ΔT, a critical parameter for machine efficiency and power generation. The limited system ΔT reduced power output. Another sub-optimal factor of the application was a brine flow rate at 120 GPM, 25% below Green Machine standard parameters of 170-190 GPM. Together, these subprime measurements equated to a lower output of 19-22kWe gross.PDF Image | Mississippi Oilfield Generates Emission Geothermal Power
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