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Numerical simulation method and application of enhanced geothermal system considering working medium storage process

A numerical simulation, enhanced technology, used in geothermal energy prediction/simulation, special data processing applications, applications, etc.

Active Publication Date: 2019-11-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] While the EGS system realizes thermal mining, it is also accompanied by a certain amount of working fluid storage, and the working fluid storage is closely related to the THM (heat transfer, flow, mechanics) multi-field coupling in the system. In view of this, in order to solve how to simulate EGS In order to solve the problem of thermal recovery performance and working medium storage capacity of the system, the present invention provides a numerical simulation method and application of an enhanced geothermal system considering the process of working medium storage; the present invention comprehensively analyzes injection wells, production wells and heat storage THM multi-field coupling process in the reservoir, and considering the working fluid storage process caused by the increase of thermal reservoir porosity and working fluid density, it can simulate the EGS system more comprehensively

Method used

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  • Numerical simulation method and application of enhanced geothermal system considering working medium storage process
  • Numerical simulation method and application of enhanced geothermal system considering working medium storage process
  • Numerical simulation method and application of enhanced geothermal system considering working medium storage process

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Embodiment 1

[0144] This embodiment is aimed at a virtual H 2 O-EGS simulates its thermal recovery rate and working fluid storage, and compares the calculation results with those of ignoring the working fluid storage process (that is, ignoring the unsteady term in equation (2)).

[0145] figure 1 It is a flow chart of the numerical simulation method of the EGS system considering the working fluid storage process proposed by the present invention, figure 2 It is a schematic diagram of the EGS system (for the convenience of analysis, the pore structure 3 of the injection well 1 and the production well 2 is also regarded as a part of the thermal reservoir 4 in this embodiment), image 3 is the size diagram of the thermal reservoir, and in this embodiment H 2 The relevant parameters of the O-EGS system are shown in Table 1. The thermophysical parameters of the working fluid are functions of the pressure and temperature of the working fluid, which can be analyzed by PROPATH software.

[01...

Embodiment 2

[0168] This embodiment is aimed at a virtual CO 2 -EGS, to simulate its thermal recovery rate and working fluid storage capacity, and compare the calculated results with those of ignoring the working fluid storage process.

[0169] The specific steps and EGS parameters of this embodiment are the same as those in Example 1, but the difference is that CO 2 The thermophysical parameters of water are different, and the injection pressure, injection temperature and output pressure are also different. The injection pressure, injection temperature and output pressure of this embodiment are respectively 13×10 6 Pa, 293K and 13×10 6 Pa.

[0170] The results of this example are as Figure 6 and Figure 7 shown. Figure 6 The CO simulated in this example 2 -EGS thermal recovery rate and CO under the condition of ignoring the working fluid storage process 2 - Comparison chart of EGS thermal mining rates, Figure 7 The CO simulated in this example 2 - EGS working fluid storage ca...

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Abstract

The invention discloses a numerical simulation method and application of an enhanced geothermal system considering a working medium storage process, and the method comprises the following solving steps at any moment: solving a continuity equation and a momentum equation by taking an unsteady-state item in the continuity equation as a known value, and calculating a speed field and a pressure fieldof a working medium in a thermal reservoir at the moment; calculating a speed field, a pressure field and a temperature field of the working medium in the injection well shaft at the moment; calculating the temperature field of the thermal reservoir at the moment, and estimating the temperature field of the thermal reservoir at the next moment; calculating a speed field, a pressure field and a temperature field of the working medium in the production well shaft at the moment; calculating the average total stress field of the thermal reservoir at the moment, and estimating the average total stress field at the next moment; calculating the porosity and permeability distribution of the thermal reservoir at the moment, and estimating the porosity distribution at the next moment; and judging whether each physical field is converged or not, if not, repeating the steps, and if so, stopping. According to the invention, the thermal recovery performance and the working medium storage capacity inthe thermal reservoir can be simulated at the same time.

Description

technical field [0001] The invention relates to the technical field of geothermal exploitation, in particular to a numerical simulation method and application of an enhanced geothermal system (EGS) considering the storage process of working medium, which is used to calculate the thermal recovery performance and storage capacity of working medium of EGS. Background technique [0002] EGS is a system that extracts heat from low-permeability and low-porosity formations (mainly hot dry rocks) to obtain a large amount of heat energy. The reservoir, and then through the circulation of working fluid to replace the heat in the thermal reservoir, so as to achieve the purpose of exploiting geothermal energy. Due to the high temperature and abundant resources of hot dry rocks, EGS has great application prospects for exploiting a large amount of thermal energy, and has received extensive attention. see figure 2 , the EGS system includes an injection well 1, a production well 2 and a t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCF24T2201/00Y02E10/10
Inventor 王昌龙黄志甲钱付平鲁进利黄新杰唐刚
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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