Upscaling of the single-phase flow and heat transport in fractured geothermal reservoirs using nonlocal multicontinuum method

Abstract

In this work, we consider a single-phase flow and heat transfer problem in fractured geothermal reservoirs. Mixed dimensional problems are considered, where the temperature and pressure equations are solved for porous matrix and fracture networks with transfer term between them. For the fine-grid approximation, a finite volume method with embedded fracture model is employed. To reduce size of the fine-grid system, an upscaled coarse-grid model is constructed using the nonlocal multicontinuum (NLMC) method. We present numerical results for two-dimensional problems with complex fracture distributions and investigate an accuracy of the proposed method. The simulations using upscaled model provide very accurate solutions with significant reduction in the dimension of problem.Publisher's note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Study on mechanism of effect of flowing water and transferring heat on rock mass temperature in curved fracture

“…Comprehensively study the influence of thermal disturbance and in-situ stress on heat storage and transferring heat in fissured geothermal reservoirs 9 . Research the single-phase flow and transferring heat in fissured geothermal reservoirs by using a nonlocal continuous approach 10 . The estimation of effective thermal conductivity of rock mass was researched 11 .…”

Influences of Dead‐End Pores in Porous Media on Viscous Fingering Instabilities and Cleanup of NAPLs in Miscible Displacements

“…Miscible displacement processes in porous media, where the interfacial tension between two fluids is zero, are of particular interest in a wide spectrum of applications such as soil and water contaminate remediation (Ali et al., 1995), sequestration (Gooya et al., 2019; Riaz et al., 2006), enhanced oil recovery (Orr & Taber, 1984), geothermal recovery (Vasilyeva et al., 2006), drug delivery (Escala et al., 2019), and chromatographic separation (Mayfield et al., 2005). However, one of the major challenges is that miscible displacements usually suffer from low displacement efficiency, which results from two broad reasons (Lake, 1989): (a) macroscopically , the displacing fluids with less viscosity tend to bypass the displaced fluids with high viscosity, resulting in the viscous fingering (VF) instability; and (b) microscopically , the displaced fluids that are trapped in stagnant pockets or dead‐end pores in swept area in porous media cannot be directly flooded by the injected fluids.…”