Design, modeling, and evaluation of a doublet heat extraction model in enhanced geothermal systems

RENEWABLE ENERGY

卷:105

Article

Xia, Yidong¹  Plummer, Mitchell¹  Mattson, Earl¹  Podgorney, Robert¹  Ghassemi, Ahmad² 

[1] Idaho Natl Lab, 1955 N Fremont Ave,POB 1625, Idaho Falls, ID 83415 USA

[2] Univ Oklahoma, 660 Barrington Oval, Norman, OK 73019 USA

关键词: Renewable energy;    EGS;    Fractured reservoir;    Heat production;    Finite element method;   

DOI  :  10.1016/j.renene.2016.12.064

来源: Elsevier

【 摘 要 】

A conceptual Enhanced Geothermal System (EGS) model, where water is circulated through a pair of parallel injection and production wells connected by a set of single large wing fractures, is designed, modeled, and evaluated in this work. The water circulation and heat extraction in the fractured reservoirs is modeled as a fully coupled process of fluid flow and heat transport. Using a newly developed, open source, finite element based geothermal simulation code, FALCON, simulation results were obtained for a 30-year operation at a depth of 3 km and geothermal gradient of 65 degrees C per km of depth. With a sensitivity study of the heat production to the design parameters, preferable fracture horizontal spacing, downward deviation angle of the parallel wells, and injection flow rate are recommended. Upscaling calculations of the developed EGS model have shown that, an industrial production-level system may be achievable if it consists of 40 equidistant fractures that connect two 1.2 km long parallel well sections with a well separation of 500 m; and if a system of these dimensions operates for 30 years at a flow rate of 0.1 m(3)/s, with an electric power output at least 5 MW and pumping power of less than 1 MW. In particular, the performance metrics demonstrated in this work match well with those suggested by others, thus indicating the general applicability of our conceptual models. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free