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AFREPREN/FWD design of the fluid collection and re-injection system (FCRS). The power station’s initial design, location and interconnection to the power grid are established at this stage. The feasibility study will yield project cost estimates, development timelines and the economic and financial analyses under probable power demand scenarios. At this stage, in accordance with environmental laws and regulations, a full-blown EIA is prepared which will serve as the basis for the issuance of the project’s work permits. Public consultations with local residents, local government units and other stakeholders are also undertaken as part of the endorsement and approval process if a geothermal project is proposed for implementation. The final output of this phase is a complete technical and financial feasibility study that can be used to solicit funding from financiers for the development of the project. e. Field Development Phase Upon successful negotiation and closure of financing for the project, the next phase involves production and re-injection drilling, detailed design, procurement and construction of the FCRS. Development of the field, in many geothermal projects, may involve multi-well pad sites. From a single site, up to four cellars can be constructed; from these cellars, up to four directional wells can then be drilled with their bottom targets deviating away from each other. This scheme of development results in a very compact production field and can be particularly useful in rugged and mountainous terrain. The detailed engineering, procurement and construction of the geothermal power station and associated substation and transmission lines are done simultaneously with the production and re-injection well drilling. f. Steam Production and Resource Management Phase The satisfactory and efficient operation and maintenance of the geothermal production facility and power plant after the completion and commissioning tests will be the key to the fulfillment of contractual commitments and the realisation of cash flows from the project over the long term. In the process of exploitation, the behavior of each individual well is closely monitored. This leads to a better understanding of the geothermal reservoir and a more comprehensive model is portrayed. Work is done to simulate and predict reservoir behavior under certain exploitation scenarios, to forecast the number of maintenance wells, as well as the drilling targets, over the project’s life. Production and re-injection wells must also be managed in order to maximise their capacity and extend their production life. In some reservoirs, injection wells become available for production as a consequence of extensive boiling and pressure draw-down. Injection management is the third strategy of sustaining generation capacity. Re-injecting the separated brine and power plant condensate should be accomplished with extra care because of their adverse effect on the production sector. Uncontrolled re-injection may cool down sections of the reservoir irreversibly. Monitoring the injection returns employs the use of chemical tracers. The results of chemical tracer tests will play a big factor in implementing the injection dispersion of the brine and condensate among new, idle or active injection wells. www.e-parl.net www.afrepren.org P a g e | 13PDF Image | Geothermal Power Generation in Kenya
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