Study of An EGS Power Plant Preliminary Feasibility Design by An Assumed Productivity Index

Abstract

A study is presented on how to choose a well profile and an electric power cycle for a preliminary feasibility study on EGS electric power plant without knowing the reservoir characteristics. Before a well has been drilled into the target reservoir, a method to calculate the feasibility is presented. The method consists of assuming a production index (PI) of the proposed wells to obtain a comprehensive design with unknown reservoir parameters. Thus, the number of wells and fluid flow can be determined allowing for electric power cycle optimization. By assuming the productivity and injectivity indexes the reservoir is de-coupled from the study of the well profiles and surface systems. Linear productivity and injectivity indexes are assumed and both are set the same allowing for simpler calculations. A set of different index values are used to create scenarios and thus the minimum index value for the feasibility of the project is found. This preliminary study is based on an EGS Power Plant to be constructed in South Hungary, close to the municipality of Battonya. This project is headed by EGS Hungary Consortium, which consists of EU–FIRE kft. and Mannvit kft. (a subsidiary of Mannvit hf. in Iceland) and in close cooperation with the Ministry of National Development in Hungary. The project is submitted as a 12 MWe EGS power plant with 9 MWe delivered to the grid. The project is co-funded by the NER300 funding of the European Commission.