Method and device for detecting underground water flow field in single-well circulation shallow geothermal system

Abstract

One or more embodiments of the invention provide a method and device for detecting an underground water flow field in a single-well circulation shallow geothermal system. The method comprises the following steps: establishing a mathematical model, establishing a control equation, determining an initial condition of the control equation, and establishing a boundary condition of the control equation; performing Laplace transformation on the control equation, the initial condition and the boundary condition to obtain a transformed control equation, initial condition and boundary condition; performing finite Fourier cosine transform on the transformed control equation, the initial condition and the boundary condition to obtain a transformed partial differential equation; solving the transformed partial differential equation, and obtaining a semi-analytical solution of the underground water flow of the single-well circulation shallow geothermal system on a Laplace domain through Laplace inverse transformation; and solving a solution on a time domain corresponding to the semi-analytical solution by utilizing a Stehfest numerical inversion method so as to detect the depth reduction distribution of the underground water flow field.

Description

technical field [0001] One or more embodiments of this specification relate to the technical fields of new energy, renewable energy and hydrogeology, and in particular to a method and device for detecting groundwater flow field in a single-well circulating shallow geothermal system. Background technique [0002] As a clean and renewable energy, geothermal energy has the advantages of large reserves, stability and greenness. In the current situation of frequent smog and severe air quality in my country, the use of geothermal energy for clean heating of buildings has attracted more and more attention. [0003] As a new technology for the development and utilization of geothermal energy, the single well circulating shallow geothermal system has the advantages of stable system, small footprint and high efficiency. It is widely used in northern my country, with huge market potential and broad development space. It is the current Important research directions and development areas...

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Problems solved by technology

[0005] However, the inventors have found that there is currently a lack of research on the groundwater flow field in the aquifer of the single-well circulating shallow geothermal system, and there is no research on the impact of relevant aquifer parameters and well structure parameters on the groundwater flow field. Awareness of groundwater flow regimes in geothermal is still lacking

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