Timothy Praditia (SRP Scholarshipholder 2017)

Title: Multiscale Simulation of Enhanced Geothermal Systems

Advisors: Prof. Dr. Hadi Hajibeygi (TU Delft), Prof. Dr.-Ing. Rainer Helmig (University of Stuttgart), Matei Ţene, M.Sc. (TU Delft)

Description: To predict the productivity of the geothermal reservoirs, as is continuously done in oil and gas reservoirs, a reservoir simulation is needed. In 1970s, studies of geothermal reservoir simulation has been initiated. The simplest formulation of the discretisation is using uniform, fine grid size to model the reservoir. However, due to the heterogeneous nature of the actual reservoir and the limited capacity of computing machines, most of the time engineers need to find another way of discretising the problems. The heterogeneity of the reservoir occurs at different scale spatially. Therefore, multiscale method can be used as one option to solve the problem. Multiscale method is different from upscaling in that the fine scale details may still be used in the simulation, while in upscaling, the fine scale details are almost always lost in the process. Using multiscale method to simulate flow and heat transfer in geothermal reservoirs can improve computational efficiency, especially when it comes to application for full-field scale.

In this work the first multiscale simulation of enhanced geothermal systems is developed via coupled flow-geothermal equations in fractured reservoirs. Built on the recently proposed multiscale method for flow (F-AMS, JCP, Ţene et al., 2016), we extend F-AMS algorithm, formulation, and implementation to include coupled flow-heat equations within enhanced geo-thermal systems. Results of this work would allow for real-field applicable simulation platform which can provide accurate and reliable assessment about productivity of a given field, provided that the proper data regarding the properties of the fluid and rock is being used.

References:

Coats, K. (1977). Geothermal Reservoir Modelling. 52nd Annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineers of AIME. Denver, Colorado: Society of Petroleum Engineers of AIME.

Malcolm A. Grant, P. F. (2011). Geothermal Reservoir Engineering - Second Edition. uckland: Elsevier.

Matei Ţene, M. S. (2016). Algebraic multiscale method for flow in heterogeneous porous media with embedded discrete fractures (F-AMS). Journal of Computational Physics 321, 819 - 845.

Matei Ţene, Y. W. (2015). Adaptive algebraic multiscale solver for compressible flow in heterogeneous porous media. Journal of Computational Physics, 679 - 694.