Coupled thermo-hydro-mechanical modeling on well pairs in heterogeneous porous geothermal reservoirs

Liu, Guihong; Pu, Hai; Zhao, Zhihong; Liu, Yanguang

doi:10.1016/j.energy.2019.01.022

Cited by 68 publications

(32 citation statements)

References 20 publications

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“…Parameter sensitivity analysis was conducted for the density of the grid division using the verification method of a single-well geothermal system proposed by Liu (2019). As verified by the analytical results, it is reasonable to geometrically simplify the 3D geothermal wells into 1D line elements in this study [27]. model were set as pressure boundaries.…”

Section: Hydrothermo Coupling Equation Of Geothermal Wellsmentioning

confidence: 80%

“…The seepage heat transfer in geothermal reservoirs can be described by the convective heat transfer equation [27,28]:…”

Section: Hydrothermo Coupling Equation Of Geothermalmentioning

confidence: 99%

“…Geothermal Multiwell Effect. Multiple geothermal doublet systems will interact if they are close enough, which is commonly referred to as the geothermal multiwell effect [27]. A geothermal doublet model generally only covers the effects of the reinjection on the thermal breakthrough of the exploitation well within a doublet system, while it tends to ignore the effects of reinjection on other geothermal wells nearby.…”

Section: Influencing Factors Of Temperature Field In Multiwell Geothe...mentioning

confidence: 99%

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Numerical Simulation and Design Optimization of Large-Scale Geothermal Production Based on a Multiwell Layout in Xianxian Geothermal Field

et al. 2022

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Large-scale geothermal production based on a multiwell layout has been promoted by the development of clean energy. However, the theories about the effects of this geothermal production pattern on the temperature field of geothermal reservoirs are yet to be improved, which hinders the design optimization of the deployment schemes of geothermal wells. This study proposed a 3D geothermal multiwell simulation method covering the heat transfer in wellbores by introducing the geothermal well theory of 1D line elements, thus improving the calculation efficiency without reducing the calculation accuracy. By taking the geothermal development using multiple wells in the Xianxian geothermal field, China, as an example, this study firstly analyzed the evolution of the temperature field in geothermal reservoirs during the geothermal exploitation based on a multiwell layout. Then, it revealed the influencing mechanisms of geothermal multiwell effect, reinjection depth, and well spacing on the thermal breakthrough of exploitation wells. Finally, it proposed an optimized design method for the geothermal development based on a multiwell layout. All these will provide scientific support for the large-scale geothermal production based on exploitation-reinjection combination using multiple wells.

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Section: Hydrothermo Coupling Equation Of Geothermal Wellsmentioning

confidence: 80%

“…The seepage heat transfer in geothermal reservoirs can be described by the convective heat transfer equation [27,28]:…”

Section: Hydrothermo Coupling Equation Of Geothermalmentioning

confidence: 99%

Section: Influencing Factors Of Temperature Field In Multiwell Geothe...mentioning

confidence: 99%

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Numerical Simulation and Design Optimization of Large-Scale Geothermal Production Based on a Multiwell Layout in Xianxian Geothermal Field

et al. 2022

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“…Governing equation of seepage field in porous media. Combining Darcy's law with the continuity equation (Liu et al, 2019a;Sun et al, 2016Sun et al, , 2017Wang et al, 2019;Xu et al, 2020): Above the equations ( 1) and ( 2), the water storage model can be expressed as: Table 1. Parameters related to the governing equation.…”

Section: Modelingmentioning

confidence: 99%

Influence of low temperature tail water reinjection on seepage and heat transfer of carbonate reservoirs

Wang

Liu

Bian

et al. 2021

Energy Exploration & Exploitation

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Seepage and heat transfer in the carbonate reservoir under low-temperature tail water reinjection is a complex coupling process, which is an important basis for scientific and reasonable evaluation of geothermal resource sustainability. This study based on the tracer test of double-well reinjection for carbonate heat reservoir, a coupling model of seepage field and temperature field of fracture network is established by using the finite element software COMSOL. The uncertainty analysis is carried out to study the fluid-thermal coupling process of carbonate fracture under the condition of low-temperature tail water reinjection.The variation law of seepage field and temperature field of thermal reservoir under low-temperature geothermal tail water reinjection is revealed, The variation of measured temperature of thermal reservoir pumping side under different reinjection conditions is predicted. The results show that the dominant fracture channels between wells of the fractured heat reservoir in Xian county geothermal field play an important role in controlling the seepage heat transfer. Under the coupling action of the seepage field, pressure field and the temperature field of the heat reservoir, the low-temperature tail water reinjection forms a preferential flow along the dominant channels, which is one of the important factors to consider in the prediction of thermal breakthrough. Reinjection pressure, temperature and well spacing are the main factors for artificial control of geothermal production and reinjection system. In the pumping and reinjection system of Xian county geothermal field, under the conditions of 0.5 MPa reinjection pressure, 30 °C reinjection tail water temperature and 270 m spacing between pumping and reinjection wells, the heat reservoir temperature at the pumping side decreased by 1.5 °C in 100 years.

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“…As for the heat transformation process, the porous media heat transfer which contains heat conduction and convection was selected. Fluid flow in porous media can be described by the Darcy law [35][36][37]. In this study, the sedimentary and metamorphic layers are considered impermeable, which the permeability is very small and heat transfer was dominated by heat conduction.…”

Section: Model Equationsmentioning

confidence: 99%

Heat Flow Correction for the High-Permeability Formation: A Case Study for Xiong’an New Area

Wang¹,

Gao

Jiang

et al. 2021

Lithosphere

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The Xiong’an New Area is located at the western Bohai Bay Basin, 150 km south of Beijing, China. The area has tremendous high heat flow value within the sedimentary layer, and the average value can reach 90 mW·m-2 within the Niutuozhen Uplift. However, combining the basal heat flow at the top of the metamorphic layer with the heat flow value which was contributed by the radiogenic heat production from the overlying formation, the surface heat flow value was only 65.1 mW·m-2 in this area. Thus, the heat flow value within the sedimentary layer was greatly influenced by other factors. In this study, based on the continuous temperature measurements data from 4 boreholes, thermos-physical parameters (conductivity, radioactive heat production, density, and heat capacity) from 90 rock sample measurements, and the regional stratigraphic development, a two-dimensional thermal-hydraulic modelling was carried out to study the influence of the heat refraction and groundwater convection on the heat flow value. According to calculation results, the heat flow disturbance caused by heat refraction was 10 mW·m-2, and the disturbance value was 20 mW·m-2 for the groundwater convection. Furthermore, when the high-permeability layer thickness was a certain value, with the increasing high-permeability layer buried depth, the influence of the groundwater convection on the temperature field which was used for the heat flow calculation became weak. While when the high-permeability layer buried depth was set up, the influence of the groundwater convection on the above temperature field became stronger with the increasing high-permeability layer thickness.

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Coupled thermo-hydro-mechanical modeling on well pairs in heterogeneous porous geothermal reservoirs

Cited by 68 publications

References 20 publications

Numerical Simulation and Design Optimization of Large-Scale Geothermal Production Based on a Multiwell Layout in Xianxian Geothermal Field

Numerical Simulation and Design Optimization of Large-Scale Geothermal Production Based on a Multiwell Layout in Xianxian Geothermal Field

Influence of low temperature tail water reinjection on seepage and heat transfer of carbonate reservoirs

Heat Flow Correction for the High-Permeability Formation: A Case Study for Xiong’an New Area

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